Adding debian version 1.29.3-4.debian/1.29.3-4debian

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3482 insertions, 0 deletions

diff --git a/debian/missing-sources/dygraph-c91c859.js b/debian/missing-sources/dygraph-c91c859.js
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+/**
+ * @license
+ * Copyright 2006 Dan Vanderkam (danvdk@gmail.com)
+ * MIT-licensed (http://opensource.org/licenses/MIT)
+ */
+
+/**
+ * @fileoverview Creates an interactive, zoomable graph based on a CSV file or
+ * string. Dygraph can handle multiple series with or without error bars. The
+ * date/value ranges will be automatically set. Dygraph uses the
+ * <canvas> tag, so it only works in FF1.5+.
+ * @author danvdk@gmail.com (Dan Vanderkam)
+
+  Usage:
+   <div id="graphdiv" style="width:800px; height:500px;"></div>
+   <script type="text/javascript">
+     new Dygraph(document.getElementById("graphdiv"),
+                 "datafile.csv",  // CSV file with headers
+                 { }); // options
+   </script>
+
+ The CSV file is of the form
+
+   Date,SeriesA,SeriesB,SeriesC
+   YYYYMMDD,A1,B1,C1
+   YYYYMMDD,A2,B2,C2
+
+ If the 'errorBars' option is set in the constructor, the input should be of
+ the form
+   Date,SeriesA,SeriesB,...
+   YYYYMMDD,A1,sigmaA1,B1,sigmaB1,...
+   YYYYMMDD,A2,sigmaA2,B2,sigmaB2,...
+
+ If the 'fractions' option is set, the input should be of the form:
+
+   Date,SeriesA,SeriesB,...
+   YYYYMMDD,A1/B1,A2/B2,...
+   YYYYMMDD,A1/B1,A2/B2,...
+
+ And error bars will be calculated automatically using a binomial distribution.
+
+ For further documentation and examples, see http://dygraphs.com/
+ */
+
+import DygraphLayout from './dygraph-layout';
+import DygraphCanvasRenderer from './dygraph-canvas';
+import DygraphOptions from './dygraph-options';
+import DygraphInteraction from './dygraph-interaction-model';
+import * as DygraphTickers from './dygraph-tickers';
+import * as utils from './dygraph-utils';
+import DEFAULT_ATTRS from './dygraph-default-attrs';
+import OPTIONS_REFERENCE from './dygraph-options-reference';
+import IFrameTarp from './iframe-tarp';
+
+import DefaultHandler from './datahandler/default';
+import ErrorBarsHandler from './datahandler/bars-error';
+import CustomBarsHandler from './datahandler/bars-custom';
+import DefaultFractionHandler from './datahandler/default-fractions';
+import FractionsBarsHandler from './datahandler/bars-fractions';
+import BarsHandler from './datahandler/bars';
+
+import AnnotationsPlugin from './plugins/annotations';
+import AxesPlugin from './plugins/axes';
+import ChartLabelsPlugin from './plugins/chart-labels';
+import GridPlugin from './plugins/grid';
+import LegendPlugin from './plugins/legend';
+import RangeSelectorPlugin from './plugins/range-selector';
+
+import GVizChart from './dygraph-gviz';
+
+"use strict";
+
+/**
+ * Creates an interactive, zoomable chart.
+ *
+ * @constructor
+ * @param {div | String} div A div or the id of a div into which to construct
+ * the chart.
+ * @param {String | Function} file A file containing CSV data or a function
+ * that returns this data. The most basic expected format for each line is
+ * "YYYY/MM/DD,val1,val2,...". For more information, see
+ * http://dygraphs.com/data.html.
+ * @param {Object} attrs Various other attributes, e.g. errorBars determines
+ * whether the input data contains error ranges. For a complete list of
+ * options, see http://dygraphs.com/options.html.
+ */
+var Dygraph = function(div, data, opts) {
+  this.__init__(div, data, opts);
+};
+
+Dygraph.NAME = "Dygraph";
+Dygraph.VERSION = "2.1.0";
+
+// Various default values
+Dygraph.DEFAULT_ROLL_PERIOD = 1;
+Dygraph.DEFAULT_WIDTH = 480;
+Dygraph.DEFAULT_HEIGHT = 320;
+
+// For max 60 Hz. animation:
+Dygraph.ANIMATION_STEPS = 12;
+Dygraph.ANIMATION_DURATION = 200;
+
+/**
+ * Standard plotters. These may be used by clients.
+ * Available plotters are:
+ * - Dygraph.Plotters.linePlotter: draws central lines (most common)
+ * - Dygraph.Plotters.errorPlotter: draws error bars
+ * - Dygraph.Plotters.fillPlotter: draws fills under lines (used with fillGraph)
+ *
+ * By default, the plotter is [fillPlotter, errorPlotter, linePlotter].
+ * This causes all the lines to be drawn over all the fills/error bars.
+ */
+Dygraph.Plotters = DygraphCanvasRenderer._Plotters;
+
+
+// Used for initializing annotation CSS rules only once.
+Dygraph.addedAnnotationCSS = false;
+
+/**
+ * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
+ * and context &lt;canvas&gt; inside of it. See the constructor for details.
+ * on the parameters.
+ * @param {Element} div the Element to render the graph into.
+ * @param {string | Function} file Source data
+ * @param {Object} attrs Miscellaneous other options
+ * @private
+ */
+Dygraph.prototype.__init__ = function(div, file, attrs) {
+  this.is_initial_draw_ = true;
+  this.readyFns_ = [];
+
+  // Support two-argument constructor
+  if (attrs === null || attrs === undefined) { attrs = {}; }
+
+  attrs = Dygraph.copyUserAttrs_(attrs);
+
+  if (typeof(div) == 'string') {
+    div = document.getElementById(div);
+  }
+
+  if (!div) {
+    throw new Error('Constructing dygraph with a non-existent div!');
+  }
+
+  // Copy the important bits into the object
+  // TODO(danvk): most of these should just stay in the attrs_ dictionary.
+  this.maindiv_ = div;
+  this.file_ = file;
+  this.rollPeriod_ = attrs.rollPeriod || Dygraph.DEFAULT_ROLL_PERIOD;
+  this.previousVerticalX_ = -1;
+  this.fractions_ = attrs.fractions || false;
+  this.dateWindow_ = attrs.dateWindow || null;
+
+  this.annotations_ = [];
+
+  // Clear the div. This ensure that, if multiple dygraphs are passed the same
+  // div, then only one will be drawn.
+  div.innerHTML = "";
+
+  // For historical reasons, the 'width' and 'height' options trump all CSS
+  // rules _except_ for an explicit 'width' or 'height' on the div.
+  // As an added convenience, if the div has zero height (like <div></div> does
+  // without any styles), then we use a default height/width.
+  if (div.style.width === '' && attrs.width) {
+    div.style.width = attrs.width + "px";
+  }
+  if (div.style.height === '' && attrs.height) {
+    div.style.height = attrs.height + "px";
+  }
+  if (div.style.height === '' && div.clientHeight === 0) {
+    div.style.height = Dygraph.DEFAULT_HEIGHT + "px";
+    if (div.style.width === '') {
+      div.style.width = Dygraph.DEFAULT_WIDTH + "px";
+    }
+  }
+  // These will be zero if the dygraph's div is hidden. In that case,
+  // use the user-specified attributes if present. If not, use zero
+  // and assume the user will call resize to fix things later.
+  this.width_ = div.clientWidth || attrs.width || 0;
+  this.height_ = div.clientHeight || attrs.height || 0;
+
+  // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
+  if (attrs.stackedGraph) {
+    attrs.fillGraph = true;
+    // TODO(nikhilk): Add any other stackedGraph checks here.
+  }
+
+  // DEPRECATION WARNING: All option processing should be moved from
+  // attrs_ and user_attrs_ to options_, which holds all this information.
+  //
+  // Dygraphs has many options, some of which interact with one another.
+  // To keep track of everything, we maintain two sets of options:
+  //
+  //  this.user_attrs_   only options explicitly set by the user.
+  //  this.attrs_        defaults, options derived from user_attrs_, data.
+  //
+  // Options are then accessed this.attr_('attr'), which first looks at
+  // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
+  // defaults without overriding behavior that the user specifically asks for.
+  this.user_attrs_ = {};
+  utils.update(this.user_attrs_, attrs);
+
+  // This sequence ensures that Dygraph.DEFAULT_ATTRS is never modified.
+  this.attrs_ = {};
+  utils.updateDeep(this.attrs_, DEFAULT_ATTRS);
+
+  this.boundaryIds_ = [];
+  this.setIndexByName_ = {};
+  this.datasetIndex_ = [];
+
+  this.registeredEvents_ = [];
+  this.eventListeners_ = {};
+
+  this.attributes_ = new DygraphOptions(this);
+
+  // Create the containing DIV and other interactive elements
+  this.createInterface_();
+
+  // Activate plugins.
+  this.plugins_ = [];
+  var plugins = Dygraph.PLUGINS.concat(this.getOption('plugins'));
+  for (var i = 0; i < plugins.length; i++) {
+    // the plugins option may contain either plugin classes or instances.
+    // Plugin instances contain an activate method.
+    var Plugin = plugins[i];  // either a constructor or an instance.
+    var pluginInstance;
+    if (typeof(Plugin.activate) !== 'undefined') {
+      pluginInstance = Plugin;
+    } else {
+      pluginInstance = new Plugin();
+    }
+
+    var pluginDict = {
+      plugin: pluginInstance,
+      events: {},
+      options: {},
+      pluginOptions: {}
+    };
+
+    var handlers = pluginInstance.activate(this);
+    for (var eventName in handlers) {
+      if (!handlers.hasOwnProperty(eventName)) continue;
+      // TODO(danvk): validate eventName.
+      pluginDict.events[eventName] = handlers[eventName];
+    }
+
+    this.plugins_.push(pluginDict);
+  }
+
+  // At this point, plugins can no longer register event handlers.
+  // Construct a map from event -> ordered list of [callback, plugin].
+  for (var i = 0; i < this.plugins_.length; i++) {
+    var plugin_dict = this.plugins_[i];
+    for (var eventName in plugin_dict.events) {
+      if (!plugin_dict.events.hasOwnProperty(eventName)) continue;
+      var callback = plugin_dict.events[eventName];
+
+      var pair = [plugin_dict.plugin, callback];
+      if (!(eventName in this.eventListeners_)) {
+        this.eventListeners_[eventName] = [pair];
+      } else {
+        this.eventListeners_[eventName].push(pair);
+      }
+    }
+  }
+
+  this.createDragInterface_();
+
+  this.start_();
+};
+
+/**
+ * Triggers a cascade of events to the various plugins which are interested in them.
+ * Returns true if the "default behavior" should be prevented, i.e. if one
+ * of the event listeners called event.preventDefault().
+ * @private
+ */
+Dygraph.prototype.cascadeEvents_ = function(name, extra_props) {
+  if (!(name in this.eventListeners_)) return false;
+
+  // QUESTION: can we use objects & prototypes to speed this up?
+  var e = {
+    dygraph: this,
+    cancelable: false,
+    defaultPrevented: false,
+    preventDefault: function() {
+      if (!e.cancelable) throw "Cannot call preventDefault on non-cancelable event.";
+      e.defaultPrevented = true;
+    },
+    propagationStopped: false,
+    stopPropagation: function() {
+      e.propagationStopped = true;
+    }
+  };
+  utils.update(e, extra_props);
+
+  var callback_plugin_pairs = this.eventListeners_[name];
+  if (callback_plugin_pairs) {
+    for (var i = callback_plugin_pairs.length - 1; i >= 0; i--) {
+      var plugin = callback_plugin_pairs[i][0];
+      var callback = callback_plugin_pairs[i][1];
+      callback.call(plugin, e);
+      if (e.propagationStopped) break;
+    }
+  }
+  return e.defaultPrevented;
+};
+
+/**
+ * Fetch a plugin instance of a particular class. Only for testing.
+ * @private
+ * @param {!Class} type The type of the plugin.
+ * @return {Object} Instance of the plugin, or null if there is none.
+ */
+Dygraph.prototype.getPluginInstance_ = function(type) {
+  for (var i = 0; i < this.plugins_.length; i++) {
+    var p = this.plugins_[i];
+    if (p.plugin instanceof type) {
+      return p.plugin;
+    }
+  }
+  return null;
+};
+
+/**
+ * Returns the zoomed status of the chart for one or both axes.
+ *
+ * Axis is an optional parameter. Can be set to 'x' or 'y'.
+ *
+ * The zoomed status for an axis is set whenever a user zooms using the mouse
+ * or when the dateWindow or valueRange are updated. Double-clicking or calling
+ * resetZoom() resets the zoom status for the chart.
+ */
+Dygraph.prototype.isZoomed = function(axis) {
+  const isZoomedX = !!this.dateWindow_;
+  if (axis === 'x') return isZoomedX;
+
+  const isZoomedY = this.axes_.map(axis => !!axis.valueRange).indexOf(true) >= 0;
+  if (axis === null || axis === undefined) {
+    return isZoomedX || isZoomedY;
+  }
+  if (axis === 'y') return isZoomedY;
+
+  throw new Error(`axis parameter is [${axis}] must be null, 'x' or 'y'.`);
+};
+
+/**
+ * Returns information about the Dygraph object, including its containing ID.
+ */
+Dygraph.prototype.toString = function() {
+  var maindiv = this.maindiv_;
+  var id = (maindiv && maindiv.id) ? maindiv.id : maindiv;
+  return "[Dygraph " + id + "]";
+};
+
+/**
+ * @private
+ * Returns the value of an option. This may be set by the user (either in the
+ * constructor or by calling updateOptions) or by dygraphs, and may be set to a
+ * per-series value.
+ * @param {string} name The name of the option, e.g. 'rollPeriod'.
+ * @param {string} [seriesName] The name of the series to which the option
+ * will be applied. If no per-series value of this option is available, then
+ * the global value is returned. This is optional.
+ * @return { ... } The value of the option.
+ */
+Dygraph.prototype.attr_ = function(name, seriesName) {
+  // For "production" code, this gets removed by uglifyjs.
+  if (typeof(process) !== 'undefined') {
+    if (process.env.NODE_ENV != 'production') {
+      if (typeof(OPTIONS_REFERENCE) === 'undefined') {
+        console.error('Must include options reference JS for testing');
+      } else if (!OPTIONS_REFERENCE.hasOwnProperty(name)) {
+        console.error('Dygraphs is using property ' + name + ', which has no ' +
+                      'entry in the Dygraphs.OPTIONS_REFERENCE listing.');
+        // Only log this error once.
+        OPTIONS_REFERENCE[name] = true;
+      }
+    }
+  }
+  return seriesName ? this.attributes_.getForSeries(name, seriesName) : this.attributes_.get(name);
+};
+
+/**
+ * Returns the current value for an option, as set in the constructor or via
+ * updateOptions. You may pass in an (optional) series name to get per-series
+ * values for the option.
+ *
+ * All values returned by this method should be considered immutable. If you
+ * modify them, there is no guarantee that the changes will be honored or that
+ * dygraphs will remain in a consistent state. If you want to modify an option,
+ * use updateOptions() instead.
+ *
+ * @param {string} name The name of the option (e.g. 'strokeWidth')
+ * @param {string=} opt_seriesName Series name to get per-series values.
+ * @return {*} The value of the option.
+ */
+Dygraph.prototype.getOption = function(name, opt_seriesName) {
+  return this.attr_(name, opt_seriesName);
+};
+
+/**
+ * Like getOption(), but specifically returns a number.
+ * This is a convenience function for working with the Closure Compiler.
+ * @param {string} name The name of the option (e.g. 'strokeWidth')
+ * @param {string=} opt_seriesName Series name to get per-series values.
+ * @return {number} The value of the option.
+ * @private
+ */
+Dygraph.prototype.getNumericOption = function(name, opt_seriesName) {
+  return /** @type{number} */(this.getOption(name, opt_seriesName));
+};
+
+/**
+ * Like getOption(), but specifically returns a string.
+ * This is a convenience function for working with the Closure Compiler.
+ * @param {string} name The name of the option (e.g. 'strokeWidth')
+ * @param {string=} opt_seriesName Series name to get per-series values.
+ * @return {string} The value of the option.
+ * @private
+ */
+Dygraph.prototype.getStringOption = function(name, opt_seriesName) {
+  return /** @type{string} */(this.getOption(name, opt_seriesName));
+};
+
+/**
+ * Like getOption(), but specifically returns a boolean.
+ * This is a convenience function for working with the Closure Compiler.
+ * @param {string} name The name of the option (e.g. 'strokeWidth')
+ * @param {string=} opt_seriesName Series name to get per-series values.
+ * @return {boolean} The value of the option.
+ * @private
+ */
+Dygraph.prototype.getBooleanOption = function(name, opt_seriesName) {
+  return /** @type{boolean} */(this.getOption(name, opt_seriesName));
+};
+
+/**
+ * Like getOption(), but specifically returns a function.
+ * This is a convenience function for working with the Closure Compiler.
+ * @param {string} name The name of the option (e.g. 'strokeWidth')
+ * @param {string=} opt_seriesName Series name to get per-series values.
+ * @return {function(...)} The value of the option.
+ * @private
+ */
+Dygraph.prototype.getFunctionOption = function(name, opt_seriesName) {
+  return /** @type{function(...)} */(this.getOption(name, opt_seriesName));
+};
+
+Dygraph.prototype.getOptionForAxis = function(name, axis) {
+  return this.attributes_.getForAxis(name, axis);
+};
+
+/**
+ * @private
+ * @param {string} axis The name of the axis (i.e. 'x', 'y' or 'y2')
+ * @return { ... } A function mapping string -> option value
+ */
+Dygraph.prototype.optionsViewForAxis_ = function(axis) {
+  var self = this;
+  return function(opt) {
+    var axis_opts = self.user_attrs_.axes;
+    if (axis_opts && axis_opts[axis] && axis_opts[axis].hasOwnProperty(opt)) {
+      return axis_opts[axis][opt];
+    }
+
+    // I don't like that this is in a second spot.
+    if (axis === 'x' && opt === 'logscale') {
+      // return the default value.
+      // TODO(konigsberg): pull the default from a global default.
+      return false;
+    }
+
+    // user-specified attributes always trump defaults, even if they're less
+    // specific.
+    if (typeof(self.user_attrs_[opt]) != 'undefined') {
+      return self.user_attrs_[opt];
+    }
+
+    axis_opts = self.attrs_.axes;
+    if (axis_opts && axis_opts[axis] && axis_opts[axis].hasOwnProperty(opt)) {
+      return axis_opts[axis][opt];
+    }
+    // check old-style axis options
+    // TODO(danvk): add a deprecation warning if either of these match.
+    if (axis == 'y' && self.axes_[0].hasOwnProperty(opt)) {
+      return self.axes_[0][opt];
+    } else if (axis == 'y2' && self.axes_[1].hasOwnProperty(opt)) {
+      return self.axes_[1][opt];
+    }
+    return self.attr_(opt);
+  };
+};
+
+/**
+ * Returns the current rolling period, as set by the user or an option.
+ * @return {number} The number of points in the rolling window
+ */
+Dygraph.prototype.rollPeriod = function() {
+  return this.rollPeriod_;
+};
+
+/**
+ * Returns the currently-visible x-range. This can be affected by zooming,
+ * panning or a call to updateOptions.
+ * Returns a two-element array: [left, right].
+ * If the Dygraph has dates on the x-axis, these will be millis since epoch.
+ */
+Dygraph.prototype.xAxisRange = function() {
+  return this.dateWindow_ ? this.dateWindow_ : this.xAxisExtremes();
+};
+
+/**
+ * Returns the lower- and upper-bound x-axis values of the data set.
+ */
+Dygraph.prototype.xAxisExtremes = function() {
+  var pad = this.getNumericOption('xRangePad') / this.plotter_.area.w;
+  if (this.numRows() === 0) {
+    return [0 - pad, 1 + pad];
+  }
+  var left = this.rawData_[0][0];
+  var right = this.rawData_[this.rawData_.length - 1][0];
+  if (pad) {
+    // Must keep this in sync with dygraph-layout _evaluateLimits()
+    var range = right - left;
+    left -= range * pad;
+    right += range * pad;
+  }
+  return [left, right];
+};
+
+/**
+ * Returns the lower- and upper-bound y-axis values for each axis. These are
+ * the ranges you'll get if you double-click to zoom out or call resetZoom().
+ * The return value is an array of [low, high] tuples, one for each y-axis.
+ */
+Dygraph.prototype.yAxisExtremes = function() {
+  // TODO(danvk): this is pretty inefficient
+  const packed = this.gatherDatasets_(this.rolledSeries_, null);
+  const { extremes } = packed;
+  const saveAxes = this.axes_;
+  this.computeYAxisRanges_(extremes);
+  const newAxes = this.axes_;
+  this.axes_ = saveAxes;
+  return newAxes.map(axis => axis.extremeRange);
+}
+
+/**
+ * Returns the currently-visible y-range for an axis. This can be affected by
+ * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
+ * called with no arguments, returns the range of the first axis.
+ * Returns a two-element array: [bottom, top].
+ */
+Dygraph.prototype.yAxisRange = function(idx) {
+  if (typeof(idx) == "undefined") idx = 0;
+  if (idx < 0 || idx >= this.axes_.length) {
+    return null;
+  }
+  var axis = this.axes_[idx];
+  return [ axis.computedValueRange[0], axis.computedValueRange[1] ];
+};
+
+/**
+ * Returns the currently-visible y-ranges for each axis. This can be affected by
+ * zooming, panning, calls to updateOptions, etc.
+ * Returns an array of [bottom, top] pairs, one for each y-axis.
+ */
+Dygraph.prototype.yAxisRanges = function() {
+  var ret = [];
+  for (var i = 0; i < this.axes_.length; i++) {
+    ret.push(this.yAxisRange(i));
+  }
+  return ret;
+};
+
+// TODO(danvk): use these functions throughout dygraphs.
+/**
+ * Convert from data coordinates to canvas/div X/Y coordinates.
+ * If specified, do this conversion for the coordinate system of a particular
+ * axis. Uses the first axis by default.
+ * Returns a two-element array: [X, Y]
+ *
+ * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
+ * instead of toDomCoords(null, y, axis).
+ */
+Dygraph.prototype.toDomCoords = function(x, y, axis) {
+  return [ this.toDomXCoord(x), this.toDomYCoord(y, axis) ];
+};
+
+/**
+ * Convert from data x coordinates to canvas/div X coordinate.
+ * If specified, do this conversion for the coordinate system of a particular
+ * axis.
+ * Returns a single value or null if x is null.
+ */
+Dygraph.prototype.toDomXCoord = function(x) {
+  if (x === null) {
+    return null;
+  }
+
+  var area = this.plotter_.area;
+  var xRange = this.xAxisRange();
+  return area.x + (x - xRange[0]) / (xRange[1] - xRange[0]) * area.w;
+};
+
+/**
+ * Convert from data x coordinates to canvas/div Y coordinate and optional
+ * axis. Uses the first axis by default.
+ *
+ * returns a single value or null if y is null.
+ */
+Dygraph.prototype.toDomYCoord = function(y, axis) {
+  var pct = this.toPercentYCoord(y, axis);
+
+  if (pct === null) {
+    return null;
+  }
+  var area = this.plotter_.area;
+  return area.y + pct * area.h;
+};
+
+/**
+ * Convert from canvas/div coords to data coordinates.
+ * If specified, do this conversion for the coordinate system of a particular
+ * axis. Uses the first axis by default.
+ * Returns a two-element array: [X, Y].
+ *
+ * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
+ * instead of toDataCoords(null, y, axis).
+ */
+Dygraph.prototype.toDataCoords = function(x, y, axis) {
+  return [ this.toDataXCoord(x), this.toDataYCoord(y, axis) ];
+};
+
+/**
+ * Convert from canvas/div x coordinate to data coordinate.
+ *
+ * If x is null, this returns null.
+ */
+Dygraph.prototype.toDataXCoord = function(x) {
+  if (x === null) {
+    return null;
+  }
+
+  var area = this.plotter_.area;
+  var xRange = this.xAxisRange();
+
+  if (!this.attributes_.getForAxis("logscale", 'x')) {
+    return xRange[0] + (x - area.x) / area.w * (xRange[1] - xRange[0]);
+  } else {
+    var pct = (x - area.x) / area.w;
+    return utils.logRangeFraction(xRange[0], xRange[1], pct);
+  }
+};
+
+/**
+ * Convert from canvas/div y coord to value.
+ *
+ * If y is null, this returns null.
+ * if axis is null, this uses the first axis.
+ */
+Dygraph.prototype.toDataYCoord = function(y, axis) {
+  if (y === null) {
+    return null;
+  }
+
+  var area = this.plotter_.area;
+  var yRange = this.yAxisRange(axis);
+
+  if (typeof(axis) == "undefined") axis = 0;
+  if (!this.attributes_.getForAxis("logscale", axis)) {
+    return yRange[0] + (area.y + area.h - y) / area.h * (yRange[1] - yRange[0]);
+  } else {
+    // Computing the inverse of toDomCoord.
+    var pct = (y - area.y) / area.h;
+    // Note reversed yRange, y1 is on top with pct==0.
+    return utils.logRangeFraction(yRange[1], yRange[0], pct);
+  }
+};
+
+/**
+ * Converts a y for an axis to a percentage from the top to the
+ * bottom of the drawing area.
+ *
+ * If the coordinate represents a value visible on the canvas, then
+ * the value will be between 0 and 1, where 0 is the top of the canvas.
+ * However, this method will return values outside the range, as
+ * values can fall outside the canvas.
+ *
+ * If y is null, this returns null.
+ * if axis is null, this uses the first axis.
+ *
+ * @param {number} y The data y-coordinate.
+ * @param {number} [axis] The axis number on which the data coordinate lives.
+ * @return {number} A fraction in [0, 1] where 0 = the top edge.
+ */
+Dygraph.prototype.toPercentYCoord = function(y, axis) {
+  if (y === null) {
+    return null;
+  }
+  if (typeof(axis) == "undefined") axis = 0;
+
+  var yRange = this.yAxisRange(axis);
+
+  var pct;
+  var logscale = this.attributes_.getForAxis("logscale", axis);
+  if (logscale) {
+    var logr0 = utils.log10(yRange[0]);
+    var logr1 = utils.log10(yRange[1]);
+    pct = (logr1 - utils.log10(y)) / (logr1 - logr0);
+  } else {
+    // yRange[1] - y is unit distance from the bottom.
+    // yRange[1] - yRange[0] is the scale of the range.
+    // (yRange[1] - y) / (yRange[1] - yRange[0]) is the % from the bottom.
+    pct = (yRange[1] - y) / (yRange[1] - yRange[0]);
+  }
+  return pct;
+};
+
+/**
+ * Converts an x value to a percentage from the left to the right of
+ * the drawing area.
+ *
+ * If the coordinate represents a value visible on the canvas, then
+ * the value will be between 0 and 1, where 0 is the left of the canvas.
+ * However, this method will return values outside the range, as
+ * values can fall outside the canvas.
+ *
+ * If x is null, this returns null.
+ * @param {number} x The data x-coordinate.
+ * @return {number} A fraction in [0, 1] where 0 = the left edge.
+ */
+Dygraph.prototype.toPercentXCoord = function(x) {
+  if (x === null) {
+    return null;
+  }
+
+  var xRange = this.xAxisRange();
+  var pct;
+  var logscale = this.attributes_.getForAxis("logscale", 'x') ;
+  if (logscale === true) {  // logscale can be null so we test for true explicitly.
+    var logr0 = utils.log10(xRange[0]);
+    var logr1 = utils.log10(xRange[1]);
+    pct = (utils.log10(x) - logr0) / (logr1 - logr0);
+  } else {
+    // x - xRange[0] is unit distance from the left.
+    // xRange[1] - xRange[0] is the scale of the range.
+    // The full expression below is the % from the left.
+    pct = (x - xRange[0]) / (xRange[1] - xRange[0]);
+  }
+  return pct;
+};
+
+/**
+ * Returns the number of columns (including the independent variable).
+ * @return {number} The number of columns.
+ */
+Dygraph.prototype.numColumns = function() {
+  if (!this.rawData_) return 0;
+  return this.rawData_[0] ? this.rawData_[0].length : this.attr_("labels").length;
+};
+
+/**
+ * Returns the number of rows (excluding any header/label row).
+ * @return {number} The number of rows, less any header.
+ */
+Dygraph.prototype.numRows = function() {
+  if (!this.rawData_) return 0;
+  return this.rawData_.length;
+};
+
+/**
+ * Returns the value in the given row and column. If the row and column exceed
+ * the bounds on the data, returns null. Also returns null if the value is
+ * missing.
+ * @param {number} row The row number of the data (0-based). Row 0 is the
+ *     first row of data, not a header row.
+ * @param {number} col The column number of the data (0-based)
+ * @return {number} The value in the specified cell or null if the row/col
+ *     were out of range.
+ */
+Dygraph.prototype.getValue = function(row, col) {
+  if (row < 0 || row > this.rawData_.length) return null;
+  if (col < 0 || col > this.rawData_[row].length) return null;
+
+  return this.rawData_[row][col];
+};
+
+/**
+ * Generates interface elements for the Dygraph: a containing div, a div to
+ * display the current point, and a textbox to adjust the rolling average
+ * period. Also creates the Renderer/Layout elements.
+ * @private
+ */
+Dygraph.prototype.createInterface_ = function() {
+  // Create the all-enclosing graph div
+  var enclosing = this.maindiv_;
+
+  this.graphDiv = document.createElement("div");
+
+  // TODO(danvk): any other styles that are useful to set here?
+  this.graphDiv.style.textAlign = 'left';  // This is a CSS "reset"
+  this.graphDiv.style.position = 'relative';
+  enclosing.appendChild(this.graphDiv);
+
+  // Create the canvas for interactive parts of the chart.
+  this.canvas_ = utils.createCanvas();
+  this.canvas_.style.position = "absolute";
+
+  // ... and for static parts of the chart.
+  this.hidden_ = this.createPlotKitCanvas_(this.canvas_);
+
+  this.canvas_ctx_ = utils.getContext(this.canvas_);
+  this.hidden_ctx_ = utils.getContext(this.hidden_);
+
+  this.resizeElements_();
+
+  // The interactive parts of the graph are drawn on top of the chart.
+  this.graphDiv.appendChild(this.hidden_);
+  this.graphDiv.appendChild(this.canvas_);
+  this.mouseEventElement_ = this.createMouseEventElement_();
+
+  // Create the grapher
+  this.layout_ = new DygraphLayout(this);
+
+  var dygraph = this;
+
+  this.mouseMoveHandler_ = function(e) {
+    dygraph.mouseMove_(e);
+  };
+
+  this.mouseOutHandler_ = function(e) {
+    // The mouse has left the chart if:
+    // 1. e.target is inside the chart
+    // 2. e.relatedTarget is outside the chart
+    var target = e.target || e.fromElement;
+    var relatedTarget = e.relatedTarget || e.toElement;
+    if (utils.isNodeContainedBy(target, dygraph.graphDiv) &&
+        !utils.isNodeContainedBy(relatedTarget, dygraph.graphDiv)) {
+      dygraph.mouseOut_(e);
+    }
+  };
+
+  this.addAndTrackEvent(window, 'mouseout', this.mouseOutHandler_);
+  this.addAndTrackEvent(this.mouseEventElement_, 'mousemove', this.mouseMoveHandler_);
+
+  // Don't recreate and register the resize handler on subsequent calls.
+  // This happens when the graph is resized.
+  if (!this.resizeHandler_) {
+    this.resizeHandler_ = function(e) {
+      dygraph.resize();
+    };
+
+    // Update when the window is resized.
+    // TODO(danvk): drop frames depending on complexity of the chart.
+    this.addAndTrackEvent(window, 'resize', this.resizeHandler_);
+  }
+};
+
+Dygraph.prototype.resizeElements_ = function() {
+  this.graphDiv.style.width = this.width_ + "px";
+  this.graphDiv.style.height = this.height_ + "px";
+
+  var pixelRatioOption = this.getNumericOption('pixelRatio')
+
+  var canvasScale = pixelRatioOption || utils.getContextPixelRatio(this.canvas_ctx_);
+  this.canvas_.width = this.width_ * canvasScale;
+  this.canvas_.height = this.height_ * canvasScale;
+  this.canvas_.style.width = this.width_ + "px";    // for IE
+  this.canvas_.style.height = this.height_ + "px";  // for IE
+  if (canvasScale !== 1) {
+    this.canvas_ctx_.scale(canvasScale, canvasScale);
+  }
+
+  var hiddenScale = pixelRatioOption || utils.getContextPixelRatio(this.hidden_ctx_);
+  this.hidden_.width = this.width_ * hiddenScale;
+  this.hidden_.height = this.height_ * hiddenScale;
+  this.hidden_.style.width = this.width_ + "px";    // for IE
+  this.hidden_.style.height = this.height_ + "px";  // for IE
+  if (hiddenScale !== 1) {
+    this.hidden_ctx_.scale(hiddenScale, hiddenScale);
+  }
+};
+
+/**
+ * Detach DOM elements in the dygraph and null out all data references.
+ * Calling this when you're done with a dygraph can dramatically reduce memory
+ * usage. See, e.g., the tests/perf.html example.
+ */
+Dygraph.prototype.destroy = function() {
+  this.canvas_ctx_.restore();
+  this.hidden_ctx_.restore();
+
+  // Destroy any plugins, in the reverse order that they were registered.
+  for (var i = this.plugins_.length - 1; i >= 0; i--) {
+    var p = this.plugins_.pop();
+    if (p.plugin.destroy) p.plugin.destroy();
+  }
+
+  var removeRecursive = function(node) {
+    while (node.hasChildNodes()) {
+      removeRecursive(node.firstChild);
+      node.removeChild(node.firstChild);
+    }
+  };
+
+  this.removeTrackedEvents_();
+
+  // remove mouse event handlers (This may not be necessary anymore)
+  utils.removeEvent(window, 'mouseout', this.mouseOutHandler_);
+  utils.removeEvent(this.mouseEventElement_, 'mousemove', this.mouseMoveHandler_);
+
+  // remove window handlers
+  utils.removeEvent(window,'resize', this.resizeHandler_);
+  this.resizeHandler_ = null;
+
+  removeRecursive(this.maindiv_);
+
+  var nullOut = function(obj) {
+    for (var n in obj) {
+      if (typeof(obj[n]) === 'object') {
+        obj[n] = null;
+      }
+    }
+  };
+  // These may not all be necessary, but it can't hurt...
+  nullOut(this.layout_);
+  nullOut(this.plotter_);
+  nullOut(this);
+};
+
+/**
+ * Creates the canvas on which the chart will be drawn. Only the Renderer ever
+ * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
+ * or the zoom rectangles) is done on this.canvas_.
+ * @param {Object} canvas The Dygraph canvas over which to overlay the plot
+ * @return {Object} The newly-created canvas
+ * @private
+ */
+Dygraph.prototype.createPlotKitCanvas_ = function(canvas) {
+  var h = utils.createCanvas();
+  h.style.position = "absolute";
+  // TODO(danvk): h should be offset from canvas. canvas needs to include
+  // some extra area to make it easier to zoom in on the far left and far
+  // right. h needs to be precisely the plot area, so that clipping occurs.
+  h.style.top = canvas.style.top;
+  h.style.left = canvas.style.left;
+  h.width = this.width_;
+  h.height = this.height_;
+  h.style.width = this.width_ + "px";    // for IE
+  h.style.height = this.height_ + "px";  // for IE
+  return h;
+};
+
+/**
+ * Creates an overlay element used to handle mouse events.
+ * @return {Object} The mouse event element.
+ * @private
+ */
+Dygraph.prototype.createMouseEventElement_ = function() {
+  return this.canvas_;
+};
+
+/**
+ * Generate a set of distinct colors for the data series. This is done with a
+ * color wheel. Saturation/Value are customizable, and the hue is
+ * equally-spaced around the color wheel. If a custom set of colors is
+ * specified, that is used instead.
+ * @private
+ */
+Dygraph.prototype.setColors_ = function() {
+  var labels = this.getLabels();
+  var num = labels.length - 1;
+  this.colors_ = [];
+  this.colorsMap_ = {};
+
+  // These are used for when no custom colors are specified.
+  var sat = this.getNumericOption('colorSaturation') || 1.0;
+  var val = this.getNumericOption('colorValue') || 0.5;
+  var half = Math.ceil(num / 2);
+
+  var colors = this.getOption('colors');
+  var visibility = this.visibility();
+  for (var i = 0; i < num; i++) {
+    if (!visibility[i]) {
+      continue;
+    }
+    var label = labels[i + 1];
+    var colorStr = this.attributes_.getForSeries('color', label);
+    if (!colorStr) {
+      if (colors) {
+        colorStr = colors[i % colors.length];
+      } else {
+        // alternate colors for high contrast.
+        var idx = i % 2 ? (half + (i + 1)/ 2) : Math.ceil((i + 1) / 2);
+        var hue = (1.0 * idx / (1 + num));
+        colorStr = utils.hsvToRGB(hue, sat, val);
+      }
+    }
+    this.colors_.push(colorStr);
+    this.colorsMap_[label] = colorStr;
+  }
+};
+
+/**
+ * Return the list of colors. This is either the list of colors passed in the
+ * attributes or the autogenerated list of rgb(r,g,b) strings.
+ * This does not return colors for invisible series.
+ * @return {Array.<string>} The list of colors.
+ */
+Dygraph.prototype.getColors = function() {
+  return this.colors_;
+};
+
+/**
+ * Returns a few attributes of a series, i.e. its color, its visibility, which
+ * axis it's assigned to, and its column in the original data.
+ * Returns null if the series does not exist.
+ * Otherwise, returns an object with column, visibility, color and axis properties.
+ * The "axis" property will be set to 1 for y1 and 2 for y2.
+ * The "column" property can be fed back into getValue(row, column) to get
+ * values for this series.
+ */
+Dygraph.prototype.getPropertiesForSeries = function(series_name) {
+  var idx = -1;
+  var labels = this.getLabels();
+  for (var i = 1; i < labels.length; i++) {
+    if (labels[i] == series_name) {
+      idx = i;
+      break;
+    }
+  }
+  if (idx == -1) return null;
+
+  return {
+    name: series_name,
+    column: idx,
+    visible: this.visibility()[idx - 1],
+    color: this.colorsMap_[series_name],
+    axis: 1 + this.attributes_.axisForSeries(series_name)
+  };
+};
+
+/**
+ * Create the text box to adjust the averaging period
+ * @private
+ */
+Dygraph.prototype.createRollInterface_ = function() {
+  // Create a roller if one doesn't exist already.
+  var roller = this.roller_;
+  if (!roller) {
+    this.roller_ = roller = document.createElement("input");
+    roller.type = "text";
+    roller.style.display = "none";
+    roller.className = 'dygraph-roller';
+    this.graphDiv.appendChild(roller);
+  }
+
+  var display = this.getBooleanOption('showRoller') ? 'block' : 'none';
+
+  var area = this.getArea();
+  var textAttr = {
+                   "top": (area.y + area.h - 25) + "px",
+                   "left": (area.x + 1) + "px",
+                   "display": display
+                 };
+  roller.size = "2";
+  roller.value = this.rollPeriod_;
+  utils.update(roller.style, textAttr);
+
+  roller.onchange = () => this.adjustRoll(roller.value);
+};
+
+/**
+ * Set up all the mouse handlers needed to capture dragging behavior for zoom
+ * events.
+ * @private
+ */
+Dygraph.prototype.createDragInterface_ = function() {
+  var context = {
+    // Tracks whether the mouse is down right now
+    isZooming: false,
+    isPanning: false,  // is this drag part of a pan?
+    is2DPan: false,    // if so, is that pan 1- or 2-dimensional?
+    dragStartX: null, // pixel coordinates
+    dragStartY: null, // pixel coordinates
+    dragEndX: null, // pixel coordinates
+    dragEndY: null, // pixel coordinates
+    dragDirection: null,
+    prevEndX: null, // pixel coordinates
+    prevEndY: null, // pixel coordinates
+    prevDragDirection: null,
+    cancelNextDblclick: false,  // see comment in dygraph-interaction-model.js
+
+    // The value on the left side of the graph when a pan operation starts.
+    initialLeftmostDate: null,
+
+    // The number of units each pixel spans. (This won't be valid for log
+    // scales)
+    xUnitsPerPixel: null,
+
+    // TODO(danvk): update this comment
+    // The range in second/value units that the viewport encompasses during a
+    // panning operation.
+    dateRange: null,
+
+    // Top-left corner of the canvas, in DOM coords
+    // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
+    px: 0,
+    py: 0,
+
+    // Values for use with panEdgeFraction, which limit how far outside the
+    // graph's data boundaries it can be panned.
+    boundedDates: null, // [minDate, maxDate]
+    boundedValues: null, // [[minValue, maxValue] ...]
+
+    // We cover iframes during mouse interactions. See comments in
+    // dygraph-utils.js for more info on why this is a good idea.
+    tarp: new IFrameTarp(),
+
+    // contextB is the same thing as this context object but renamed.
+    initializeMouseDown: function(event, g, contextB) {
+      // prevents mouse drags from selecting page text.
+      if (event.preventDefault) {
+        event.preventDefault();  // Firefox, Chrome, etc.
+      } else {
+        event.returnValue = false;  // IE
+        event.cancelBubble = true;
+      }
+
+      var canvasPos = utils.findPos(g.canvas_);
+      contextB.px = canvasPos.x;
+      contextB.py = canvasPos.y;
+      contextB.dragStartX = utils.dragGetX_(event, contextB);
+      contextB.dragStartY = utils.dragGetY_(event, contextB);
+      contextB.cancelNextDblclick = false;
+      contextB.tarp.cover();
+    },
+    destroy: function() {
+      var context = this;
+      if (context.isZooming || context.isPanning) {
+        context.isZooming = false;
+        context.dragStartX = null;
+        context.dragStartY = null;
+      }
+
+      if (context.isPanning) {
+        context.isPanning = false;
+        context.draggingDate = null;
+        context.dateRange = null;
+        for (var i = 0; i < self.axes_.length; i++) {
+          delete self.axes_[i].draggingValue;
+          delete self.axes_[i].dragValueRange;
+        }
+      }
+
+      context.tarp.uncover();
+    }
+  };
+
+  var interactionModel = this.getOption("interactionModel");
+
+  // Self is the graph.
+  var self = this;
+
+  // Function that binds the graph and context to the handler.
+  var bindHandler = function(handler) {
+    return function(event) {
+      handler(event, self, context);
+    };
+  };
+
+  for (var eventName in interactionModel) {
+    if (!interactionModel.hasOwnProperty(eventName)) continue;
+    this.addAndTrackEvent(this.mouseEventElement_, eventName,
+        bindHandler(interactionModel[eventName]));
+  }
+
+  // If the user releases the mouse button during a drag, but not over the
+  // canvas, then it doesn't count as a zooming action.
+  if (!interactionModel.willDestroyContextMyself) {
+    var mouseUpHandler = function(event) {
+      context.destroy();
+    };
+
+    this.addAndTrackEvent(document, 'mouseup', mouseUpHandler);
+  }
+};
+
+/**
+ * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
+ * up any previous zoom rectangles that were drawn. This could be optimized to
+ * avoid extra redrawing, but it's tricky to avoid interactions with the status
+ * dots.
+ *
+ * @param {number} direction the direction of the zoom rectangle. Acceptable
+ *     values are utils.HORIZONTAL and utils.VERTICAL.
+ * @param {number} startX The X position where the drag started, in canvas
+ *     coordinates.
+ * @param {number} endX The current X position of the drag, in canvas coords.
+ * @param {number} startY The Y position where the drag started, in canvas
+ *     coordinates.
+ * @param {number} endY The current Y position of the drag, in canvas coords.
+ * @param {number} prevDirection the value of direction on the previous call to
+ *     this function. Used to avoid excess redrawing
+ * @param {number} prevEndX The value of endX on the previous call to this
+ *     function. Used to avoid excess redrawing
+ * @param {number} prevEndY The value of endY on the previous call to this
+ *     function. Used to avoid excess redrawing
+ * @private
+ */
+Dygraph.prototype.drawZoomRect_ = function(direction, startX, endX, startY,
+                                           endY, prevDirection, prevEndX,
+                                           prevEndY) {
+  var ctx = this.canvas_ctx_;
+
+  // Clean up from the previous rect if necessary
+  if (prevDirection == utils.HORIZONTAL) {
+    ctx.clearRect(Math.min(startX, prevEndX), this.layout_.getPlotArea().y,
+                  Math.abs(startX - prevEndX), this.layout_.getPlotArea().h);
+  } else if (prevDirection == utils.VERTICAL) {
+    ctx.clearRect(this.layout_.getPlotArea().x, Math.min(startY, prevEndY),
+                  this.layout_.getPlotArea().w, Math.abs(startY - prevEndY));
+  }
+
+  // Draw a light-grey rectangle to show the new viewing area
+  if (direction == utils.HORIZONTAL) {
+    if (endX && startX) {
+      ctx.fillStyle = "rgba(128,128,128,0.33)";
+      ctx.fillRect(Math.min(startX, endX), this.layout_.getPlotArea().y,
+                   Math.abs(endX - startX), this.layout_.getPlotArea().h);
+    }
+  } else if (direction == utils.VERTICAL) {
+    if (endY && startY) {
+      ctx.fillStyle = "rgba(128,128,128,0.33)";
+      ctx.fillRect(this.layout_.getPlotArea().x, Math.min(startY, endY),
+                   this.layout_.getPlotArea().w, Math.abs(endY - startY));
+    }
+  }
+};
+
+/**
+ * Clear the zoom rectangle (and perform no zoom).
+ * @private
+ */
+Dygraph.prototype.clearZoomRect_ = function() {
+  this.currentZoomRectArgs_ = null;
+  this.canvas_ctx_.clearRect(0, 0, this.width_, this.height_);
+};
+
+/**
+ * Zoom to something containing [lowX, highX]. These are pixel coordinates in
+ * the canvas. The exact zoom window may be slightly larger if there are no data
+ * points near lowX or highX. Don't confuse this function with doZoomXDates,
+ * which accepts dates that match the raw data. This function redraws the graph.
+ *
+ * @param {number} lowX The leftmost pixel value that should be visible.
+ * @param {number} highX The rightmost pixel value that should be visible.
+ * @private
+ */
+Dygraph.prototype.doZoomX_ = function(lowX, highX) {
+  this.currentZoomRectArgs_ = null;
+  // Find the earliest and latest dates contained in this canvasx range.
+  // Convert the call to date ranges of the raw data.
+  var minDate = this.toDataXCoord(lowX);
+  var maxDate = this.toDataXCoord(highX);
+  this.doZoomXDates_(minDate, maxDate);
+};
+
+/**
+ * Zoom to something containing [minDate, maxDate] values. Don't confuse this
+ * method with doZoomX which accepts pixel coordinates. This function redraws
+ * the graph.
+ *
+ * @param {number} minDate The minimum date that should be visible.
+ * @param {number} maxDate The maximum date that should be visible.
+ * @private
+ */
+Dygraph.prototype.doZoomXDates_ = function(minDate, maxDate) {
+  // TODO(danvk): when xAxisRange is null (i.e. "fit to data", the animation
+  // can produce strange effects. Rather than the x-axis transitioning slowly
+  // between values, it can jerk around.)
+  var old_window = this.xAxisRange();
+  var new_window = [minDate, maxDate];
+  const zoomCallback = this.getFunctionOption('zoomCallback');
+  this.doAnimatedZoom(old_window, new_window, null, null, () => {
+    if (zoomCallback) {
+      zoomCallback.call(this, minDate, maxDate, this.yAxisRanges());
+    }
+  });
+};
+
+/**
+ * Zoom to something containing [lowY, highY]. These are pixel coordinates in
+ * the canvas. This function redraws the graph.
+ *
+ * @param {number} lowY The topmost pixel value that should be visible.
+ * @param {number} highY The lowest pixel value that should be visible.
+ * @private
+ */
+Dygraph.prototype.doZoomY_ = function(lowY, highY) {
+  this.currentZoomRectArgs_ = null;
+  // Find the highest and lowest values in pixel range for each axis.
+  // Note that lowY (in pixels) corresponds to the max Value (in data coords).
+  // This is because pixels increase as you go down on the screen, whereas data
+  // coordinates increase as you go up the screen.
+  var oldValueRanges = this.yAxisRanges();
+  var newValueRanges = [];
+  for (var i = 0; i < this.axes_.length; i++) {
+    var hi = this.toDataYCoord(lowY, i);
+    var low = this.toDataYCoord(highY, i);
+    newValueRanges.push([low, hi]);
+  }
+
+  const zoomCallback = this.getFunctionOption('zoomCallback');
+  this.doAnimatedZoom(null, null, oldValueRanges, newValueRanges, () => {
+    if (zoomCallback) {
+      const [minX, maxX] = this.xAxisRange();
+      zoomCallback.call(this, minX, maxX, this.yAxisRanges());
+    }
+  });
+};
+
+/**
+ * Transition function to use in animations. Returns values between 0.0
+ * (totally old values) and 1.0 (totally new values) for each frame.
+ * @private
+ */
+Dygraph.zoomAnimationFunction = function(frame, numFrames) {
+  var k = 1.5;
+  return (1.0 - Math.pow(k, -frame)) / (1.0 - Math.pow(k, -numFrames));
+};
+
+/**
+ * Reset the zoom to the original view coordinates. This is the same as
+ * double-clicking on the graph.
+ */
+Dygraph.prototype.resetZoom = function() {
+  const dirtyX = this.isZoomed('x');
+  const dirtyY = this.isZoomed('y');
+  const dirty = dirtyX || dirtyY;
+
+  // Clear any selection, since it's likely to be drawn in the wrong place.
+  this.clearSelection();
+
+  if (!dirty) return;
+
+  // Calculate extremes to avoid lack of padding on reset.
+  const [minDate, maxDate] = this.xAxisExtremes();
+
+  const animatedZooms = this.getBooleanOption('animatedZooms');
+  const zoomCallback = this.getFunctionOption('zoomCallback');
+
+  // TODO(danvk): merge this block w/ the code below.
+  // TODO(danvk): factor out a generic, public zoomTo method.
+  if (!animatedZooms) {
+    this.dateWindow_ = null;
+    this.axes_.forEach(axis => {
+      if (axis.valueRange) delete axis.valueRange;
+    });
+
+    this.drawGraph_();
+    if (zoomCallback) {
+      zoomCallback.call(this, minDate, maxDate, this.yAxisRanges());
+    }
+    return;
+  }
+
+  var oldWindow=null, newWindow=null, oldValueRanges=null, newValueRanges=null;
+  if (dirtyX) {
+    oldWindow = this.xAxisRange();
+    newWindow = [minDate, maxDate];
+  }
+
+  if (dirtyY) {
+    oldValueRanges = this.yAxisRanges();
+    newValueRanges = this.yAxisExtremes();
+  }
+
+  this.doAnimatedZoom(oldWindow, newWindow, oldValueRanges, newValueRanges,
+      () => {
+        this.dateWindow_ = null;
+        this.axes_.forEach(axis => {
+          if (axis.valueRange) delete axis.valueRange;
+        });
+        if (zoomCallback) {
+          zoomCallback.call(this, minDate, maxDate, this.yAxisRanges());
+        }
+      });
+};
+
+/**
+ * Combined animation logic for all zoom functions.
+ * either the x parameters or y parameters may be null.
+ * @private
+ */
+Dygraph.prototype.doAnimatedZoom = function(oldXRange, newXRange, oldYRanges, newYRanges, callback) {
+  var steps = this.getBooleanOption("animatedZooms") ?
+      Dygraph.ANIMATION_STEPS : 1;
+
+  var windows = [];
+  var valueRanges = [];
+  var step, frac;
+
+  if (oldXRange !== null && newXRange !== null) {
+    for (step = 1; step <= steps; step++) {
+      frac = Dygraph.zoomAnimationFunction(step, steps);
+      windows[step-1] = [oldXRange[0]*(1-frac) + frac*newXRange[0],
+                         oldXRange[1]*(1-frac) + frac*newXRange[1]];
+    }
+  }
+
+  if (oldYRanges !== null && newYRanges !== null) {
+    for (step = 1; step <= steps; step++) {
+      frac = Dygraph.zoomAnimationFunction(step, steps);
+      var thisRange = [];
+      for (var j = 0; j < this.axes_.length; j++) {
+        thisRange.push([oldYRanges[j][0]*(1-frac) + frac*newYRanges[j][0],
+                        oldYRanges[j][1]*(1-frac) + frac*newYRanges[j][1]]);
+      }
+      valueRanges[step-1] = thisRange;
+    }
+  }
+
+  utils.repeatAndCleanup(step => {
+    if (valueRanges.length) {
+      for (var i = 0; i < this.axes_.length; i++) {
+        var w = valueRanges[step][i];
+        this.axes_[i].valueRange = [w[0], w[1]];
+      }
+    }
+    if (windows.length) {
+      this.dateWindow_ = windows[step];
+    }
+    this.drawGraph_();
+  }, steps, Dygraph.ANIMATION_DURATION / steps, callback);
+};
+
+/**
+ * Get the current graph's area object.
+ *
+ * Returns: {x, y, w, h}
+ */
+Dygraph.prototype.getArea = function() {
+  return this.plotter_.area;
+};
+
+/**
+ * Convert a mouse event to DOM coordinates relative to the graph origin.
+ *
+ * Returns a two-element array: [X, Y].
+ */
+Dygraph.prototype.eventToDomCoords = function(event) {
+  if (event.offsetX && event.offsetY) {
+    return [ event.offsetX, event.offsetY ];
+  } else {
+    var eventElementPos = utils.findPos(this.mouseEventElement_);
+    var canvasx = utils.pageX(event) - eventElementPos.x;
+    var canvasy = utils.pageY(event) - eventElementPos.y;
+    return [canvasx, canvasy];
+  }
+};
+
+/**
+ * Given a canvas X coordinate, find the closest row.
+ * @param {number} domX graph-relative DOM X coordinate
+ * Returns {number} row number.
+ * @private
+ */
+Dygraph.prototype.findClosestRow = function(domX) {
+  var minDistX = Infinity;
+  var closestRow = -1;
+  var sets = this.layout_.points;
+  for (var i = 0; i < sets.length; i++) {
+    var points = sets[i];
+    var len = points.length;
+    for (var j = 0; j < len; j++) {
+      var point = points[j];
+      if (!utils.isValidPoint(point, true)) continue;
+      var dist = Math.abs(point.canvasx - domX);
+      if (dist < minDistX) {
+        minDistX = dist;
+        closestRow = point.idx;
+      }
+    }
+  }
+
+  return closestRow;
+};
+
+/**
+ * Given canvas X,Y coordinates, find the closest point.
+ *
+ * This finds the individual data point across all visible series
+ * that's closest to the supplied DOM coordinates using the standard
+ * Euclidean X,Y distance.
+ *
+ * @param {number} domX graph-relative DOM X coordinate
+ * @param {number} domY graph-relative DOM Y coordinate
+ * Returns: {row, seriesName, point}
+ * @private
+ */
+Dygraph.prototype.findClosestPoint = function(domX, domY) {
+  var minDist = Infinity;
+  var dist, dx, dy, point, closestPoint, closestSeries, closestRow;
+  for ( var setIdx = this.layout_.points.length - 1 ; setIdx >= 0 ; --setIdx ) {
+    var points = this.layout_.points[setIdx];
+    for (var i = 0; i < points.length; ++i) {
+      point = points[i];
+      if (!utils.isValidPoint(point)) continue;
+      dx = point.canvasx - domX;
+      dy = point.canvasy - domY;
+      dist = dx * dx + dy * dy;
+      if (dist < minDist) {
+        minDist = dist;
+        closestPoint = point;
+        closestSeries = setIdx;
+        closestRow = point.idx;
+      }
+    }
+  }
+  var name = this.layout_.setNames[closestSeries];
+  return {
+    row: closestRow,
+    seriesName: name,
+    point: closestPoint
+  };
+};
+
+/**
+ * Given canvas X,Y coordinates, find the touched area in a stacked graph.
+ *
+ * This first finds the X data point closest to the supplied DOM X coordinate,
+ * then finds the series which puts the Y coordinate on top of its filled area,
+ * using linear interpolation between adjacent point pairs.
+ *
+ * @param {number} domX graph-relative DOM X coordinate
+ * @param {number} domY graph-relative DOM Y coordinate
+ * Returns: {row, seriesName, point}
+ * @private
+ */
+Dygraph.prototype.findStackedPoint = function(domX, domY) {
+  var row = this.findClosestRow(domX);
+  var closestPoint, closestSeries;
+  for (var setIdx = 0; setIdx < this.layout_.points.length; ++setIdx) {
+    var boundary = this.getLeftBoundary_(setIdx);
+    var rowIdx = row - boundary;
+    var points = this.layout_.points[setIdx];
+    if (rowIdx >= points.length) continue;
+    var p1 = points[rowIdx];
+    if (!utils.isValidPoint(p1)) continue;
+    var py = p1.canvasy;
+    if (domX > p1.canvasx && rowIdx + 1 < points.length) {
+      // interpolate series Y value using next point
+      var p2 = points[rowIdx + 1];
+      if (utils.isValidPoint(p2)) {
+        var dx = p2.canvasx - p1.canvasx;
+        if (dx > 0) {
+          var r = (domX - p1.canvasx) / dx;
+          py += r * (p2.canvasy - p1.canvasy);
+        }
+      }
+    } else if (domX < p1.canvasx && rowIdx > 0) {
+      // interpolate series Y value using previous point
+      var p0 = points[rowIdx - 1];
+      if (utils.isValidPoint(p0)) {
+        var dx = p1.canvasx - p0.canvasx;
+        if (dx > 0) {
+          var r = (p1.canvasx - domX) / dx;
+          py += r * (p0.canvasy - p1.canvasy);
+        }
+      }
+    }
+    // Stop if the point (domX, py) is above this series' upper edge
+    if (setIdx === 0 || py < domY) {
+      closestPoint = p1;
+      closestSeries = setIdx;
+    }
+  }
+  var name = this.layout_.setNames[closestSeries];
+  return {
+    row: row,
+    seriesName: name,
+    point: closestPoint
+  };
+};
+
+/**
+ * When the mouse moves in the canvas, display information about a nearby data
+ * point and draw dots over those points in the data series. This function
+ * takes care of cleanup of previously-drawn dots.
+ * @param {Object} event The mousemove event from the browser.
+ * @private
+ */
+Dygraph.prototype.mouseMove_ = function(event) {
+  // This prevents JS errors when mousing over the canvas before data loads.
+  var points = this.layout_.points;
+  if (points === undefined || points === null) return;
+
+  var canvasCoords = this.eventToDomCoords(event);
+  var canvasx = canvasCoords[0];
+  var canvasy = canvasCoords[1];
+
+  var highlightSeriesOpts = this.getOption("highlightSeriesOpts");
+  var selectionChanged = false;
+  if (highlightSeriesOpts && !this.isSeriesLocked()) {
+    var closest;
+    if (this.getBooleanOption("stackedGraph")) {
+      closest = this.findStackedPoint(canvasx, canvasy);
+    } else {
+      closest = this.findClosestPoint(canvasx, canvasy);
+    }
+    selectionChanged = this.setSelection(closest.row, closest.seriesName);
+  } else {
+    var idx = this.findClosestRow(canvasx);
+    selectionChanged = this.setSelection(idx);
+  }
+
+  var callback = this.getFunctionOption("highlightCallback");
+  if (callback && selectionChanged) {
+    callback.call(this, event,
+        this.lastx_,
+        this.selPoints_,
+        this.lastRow_,
+        this.highlightSet_);
+  }
+};
+
+/**
+ * Fetch left offset from the specified set index or if not passed, the
+ * first defined boundaryIds record (see bug #236).
+ * @private
+ */
+Dygraph.prototype.getLeftBoundary_ = function(setIdx) {
+  if (this.boundaryIds_[setIdx]) {
+      return this.boundaryIds_[setIdx][0];
+  } else {
+    for (var i = 0; i < this.boundaryIds_.length; i++) {
+      if (this.boundaryIds_[i] !== undefined) {
+        return this.boundaryIds_[i][0];
+      }
+    }
+    return 0;
+  }
+};
+
+Dygraph.prototype.animateSelection_ = function(direction) {
+  var totalSteps = 10;
+  var millis = 30;
+  if (this.fadeLevel === undefined) this.fadeLevel = 0;
+  if (this.animateId === undefined) this.animateId = 0;
+  var start = this.fadeLevel;
+  var steps = direction < 0 ? start : totalSteps - start;
+  if (steps <= 0) {
+    if (this.fadeLevel) {
+      this.updateSelection_(1.0);
+    }
+    return;
+  }
+
+  var thisId = ++this.animateId;
+  var that = this;
+  var cleanupIfClearing = function() {
+    // if we haven't reached fadeLevel 0 in the max frame time,
+    // ensure that the clear happens and just go to 0
+    if (that.fadeLevel !== 0 && direction < 0) {
+      that.fadeLevel = 0;
+      that.clearSelection();
+    }
+  };
+  utils.repeatAndCleanup(
+    function(n) {
+      // ignore simultaneous animations
+      if (that.animateId != thisId) return;
+
+      that.fadeLevel += direction;
+      if (that.fadeLevel === 0) {
+        that.clearSelection();
+      } else {
+        that.updateSelection_(that.fadeLevel / totalSteps);
+      }
+    },
+    steps, millis, cleanupIfClearing);
+};
+
+/**
+ * Draw dots over the selectied points in the data series. This function
+ * takes care of cleanup of previously-drawn dots.
+ * @private
+ */
+Dygraph.prototype.updateSelection_ = function(opt_animFraction) {
+  /*var defaultPrevented = */
+  this.cascadeEvents_('select', {
+    selectedRow: this.lastRow_ === -1 ? undefined : this.lastRow_,
+    selectedX: this.lastx_ === -1 ? undefined : this.lastx_,
+    selectedPoints: this.selPoints_
+  });
+  // TODO(danvk): use defaultPrevented here?
+
+  // Clear the previously drawn vertical, if there is one
+  var i;
+  var ctx = this.canvas_ctx_;
+  if (this.getOption('highlightSeriesOpts')) {
+    ctx.clearRect(0, 0, this.width_, this.height_);
+    var alpha = 1.0 - this.getNumericOption('highlightSeriesBackgroundAlpha');
+    var backgroundColor = utils.toRGB_(this.getOption('highlightSeriesBackgroundColor'));
+
+    if (alpha) {
+      // Activating background fade includes an animation effect for a gradual
+      // fade. TODO(klausw): make this independently configurable if it causes
+      // issues? Use a shared preference to control animations?
+      var animateBackgroundFade = true;
+      if (animateBackgroundFade) {
+        if (opt_animFraction === undefined) {
+          // start a new animation
+          this.animateSelection_(1);
+          return;
+        }
+        alpha *= opt_animFraction;
+      }
+      ctx.fillStyle = 'rgba(' + backgroundColor.r + ',' + backgroundColor.g + ',' + backgroundColor.b + ',' + alpha + ')';
+      ctx.fillRect(0, 0, this.width_, this.height_);
+    }
+
+    // Redraw only the highlighted series in the interactive canvas (not the
+    // static plot canvas, which is where series are usually drawn).
+    this.plotter_._renderLineChart(this.highlightSet_, ctx);
+  } else if (this.previousVerticalX_ >= 0) {
+    // Determine the maximum highlight circle size.
+    var maxCircleSize = 0;
+    var labels = this.attr_('labels');
+    for (i = 1; i < labels.length; i++) {
+      var r = this.getNumericOption('highlightCircleSize', labels[i]);
+      if (r > maxCircleSize) maxCircleSize = r;
+    }
+    var px = this.previousVerticalX_;
+    ctx.clearRect(px - maxCircleSize - 1, 0,
+                  2 * maxCircleSize + 2, this.height_);
+  }
+
+  if (this.selPoints_.length > 0) {
+    // Draw colored circles over the center of each selected point
+    var canvasx = this.selPoints_[0].canvasx;
+    ctx.save();
+    for (i = 0; i < this.selPoints_.length; i++) {
+      var pt = this.selPoints_[i];
+      if (isNaN(pt.canvasy)) continue;
+
+      var circleSize = this.getNumericOption('highlightCircleSize', pt.name);
+      var callback = this.getFunctionOption("drawHighlightPointCallback", pt.name);
+      var color = this.plotter_.colors[pt.name];
+      if (!callback) {
+        callback = utils.Circles.DEFAULT;
+      }
+      ctx.lineWidth = this.getNumericOption('strokeWidth', pt.name);
+      ctx.strokeStyle = color;
+      ctx.fillStyle = color;
+      callback.call(this, this, pt.name, ctx, canvasx, pt.canvasy,
+          color, circleSize, pt.idx);
+    }
+    ctx.restore();
+
+    this.previousVerticalX_ = canvasx;
+  }
+};
+
+/**
+ * Manually set the selected points and display information about them in the
+ * legend. The selection can be cleared using clearSelection() and queried
+ * using getSelection().
+ *
+ * To set a selected series but not a selected point, call setSelection with
+ * row=false and the selected series name.
+ *
+ * @param {number} row Row number that should be highlighted (i.e. appear with
+ * hover dots on the chart).
+ * @param {seriesName} optional series name to highlight that series with the
+ * the highlightSeriesOpts setting.
+ * @param { locked } optional If true, keep seriesName selected when mousing
+ * over the graph, disabling closest-series highlighting. Call clearSelection()
+ * to unlock it.
+ */
+Dygraph.prototype.setSelection = function(row, opt_seriesName, opt_locked) {
+  // Extract the points we've selected
+  this.selPoints_ = [];
+
+  var changed = false;
+  if (row !== false && row >= 0) {
+    if (row != this.lastRow_) changed = true;
+    this.lastRow_ = row;
+    for (var setIdx = 0; setIdx < this.layout_.points.length; ++setIdx) {
+      var points = this.layout_.points[setIdx];
+      // Check if the point at the appropriate index is the point we're looking
+      // for.  If it is, just use it, otherwise search the array for a point
+      // in the proper place.
+      var setRow = row - this.getLeftBoundary_(setIdx);
+      if (setRow >= 0 && setRow < points.length && points[setRow].idx == row) {
+        var point = points[setRow];
+        if (point.yval !== null) this.selPoints_.push(point);
+      } else {
+        for (var pointIdx = 0; pointIdx < points.length; ++pointIdx) {
+          var point = points[pointIdx];
+          if (point.idx == row) {
+            if (point.yval !== null) {
+              this.selPoints_.push(point);
+            }
+            break;
+          }
+        }
+      }
+    }
+  } else {
+    if (this.lastRow_ >= 0) changed = true;
+    this.lastRow_ = -1;
+  }
+
+  if (this.selPoints_.length) {
+    this.lastx_ = this.selPoints_[0].xval;
+  } else {
+    this.lastx_ = -1;
+  }
+
+  if (opt_seriesName !== undefined) {
+    if (this.highlightSet_ !== opt_seriesName) changed = true;
+    this.highlightSet_ = opt_seriesName;
+  }
+
+  if (opt_locked !== undefined) {
+    this.lockedSet_ = opt_locked;
+  }
+
+  if (changed) {
+    this.updateSelection_(undefined);
+  }
+  return changed;
+};
+
+/**
+ * The mouse has left the canvas. Clear out whatever artifacts remain
+ * @param {Object} event the mouseout event from the browser.
+ * @private
+ */
+Dygraph.prototype.mouseOut_ = function(event) {
+  if (this.getFunctionOption("unhighlightCallback")) {
+    this.getFunctionOption("unhighlightCallback").call(this, event);
+  }
+
+  if (this.getBooleanOption("hideOverlayOnMouseOut") && !this.lockedSet_) {
+    this.clearSelection();
+  }
+};
+
+/**
+ * Clears the current selection (i.e. points that were highlighted by moving
+ * the mouse over the chart).
+ */
+Dygraph.prototype.clearSelection = function() {
+  this.cascadeEvents_('deselect', {});
+
+  this.lockedSet_ = false;
+  // Get rid of the overlay data
+  if (this.fadeLevel) {
+    this.animateSelection_(-1);
+    return;
+  }
+  this.canvas_ctx_.clearRect(0, 0, this.width_, this.height_);
+  this.fadeLevel = 0;
+  this.selPoints_ = [];
+  this.lastx_ = -1;
+  this.lastRow_ = -1;
+  this.highlightSet_ = null;
+};
+
+/**
+ * Returns the number of the currently selected row. To get data for this row,
+ * you can use the getValue method.
+ * @return {number} row number, or -1 if nothing is selected
+ */
+Dygraph.prototype.getSelection = function() {
+  if (!this.selPoints_ || this.selPoints_.length < 1) {
+    return -1;
+  }
+
+  for (var setIdx = 0; setIdx < this.layout_.points.length; setIdx++) {
+    var points = this.layout_.points[setIdx];
+    for (var row = 0; row < points.length; row++) {
+      if (points[row].x == this.selPoints_[0].x) {
+        return points[row].idx;
+      }
+    }
+  }
+  return -1;
+};
+
+/**
+ * Returns the name of the currently-highlighted series.
+ * Only available when the highlightSeriesOpts option is in use.
+ */
+Dygraph.prototype.getHighlightSeries = function() {
+  return this.highlightSet_;
+};
+
+/**
+ * Returns true if the currently-highlighted series was locked
+ * via setSelection(..., seriesName, true).
+ */
+Dygraph.prototype.isSeriesLocked = function() {
+  return this.lockedSet_;
+};
+
+/**
+ * Fires when there's data available to be graphed.
+ * @param {string} data Raw CSV data to be plotted
+ * @private
+ */
+Dygraph.prototype.loadedEvent_ = function(data) {
+  this.rawData_ = this.parseCSV_(data);
+  this.cascadeDataDidUpdateEvent_();
+  this.predraw_();
+};
+
+/**
+ * Add ticks on the x-axis representing years, months, quarters, weeks, or days
+ * @private
+ */
+Dygraph.prototype.addXTicks_ = function() {
+  // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
+  var range;
+  if (this.dateWindow_) {
+    range = [this.dateWindow_[0], this.dateWindow_[1]];
+  } else {
+    range = this.xAxisExtremes();
+  }
+
+  var xAxisOptionsView = this.optionsViewForAxis_('x');
+  var xTicks = xAxisOptionsView('ticker')(
+      range[0],
+      range[1],
+      this.plotter_.area.w,  // TODO(danvk): should be area.width
+      xAxisOptionsView,
+      this);
+  // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
+  // console.log(msg);
+  this.layout_.setXTicks(xTicks);
+};
+
+/**
+ * Returns the correct handler class for the currently set options.
+ * @private
+ */
+Dygraph.prototype.getHandlerClass_ = function() {
+  var handlerClass;
+  if (this.attr_('dataHandler')) {
+    handlerClass =  this.attr_('dataHandler');
+  } else if (this.fractions_) {
+    if (this.getBooleanOption('errorBars')) {
+      handlerClass = FractionsBarsHandler;
+    } else {
+      handlerClass = DefaultFractionHandler;
+    }
+  } else if (this.getBooleanOption('customBars')) {
+    handlerClass = CustomBarsHandler;
+  } else if (this.getBooleanOption('errorBars')) {
+    handlerClass = ErrorBarsHandler;
+  } else {
+    handlerClass = DefaultHandler;
+  }
+  return handlerClass;
+};
+
+/**
+ * @private
+ * This function is called once when the chart's data is changed or the options
+ * dictionary is updated. It is _not_ called when the user pans or zooms. The
+ * idea is that values derived from the chart's data can be computed here,
+ * rather than every time the chart is drawn. This includes things like the
+ * number of axes, rolling averages, etc.
+ */
+Dygraph.prototype.predraw_ = function() {
+  var start = new Date();
+
+  // Create the correct dataHandler
+  this.dataHandler_ = new (this.getHandlerClass_())();
+
+  this.layout_.computePlotArea();
+
+  // TODO(danvk): move more computations out of drawGraph_ and into here.
+  this.computeYAxes_();
+
+  if (!this.is_initial_draw_) {
+    this.canvas_ctx_.restore();
+    this.hidden_ctx_.restore();
+  }
+
+  this.canvas_ctx_.save();
+  this.hidden_ctx_.save();
+
+  // Create a new plotter.
+  this.plotter_ = new DygraphCanvasRenderer(this,
+                                            this.hidden_,
+                                            this.hidden_ctx_,
+                                            this.layout_);
+
+  // The roller sits in the bottom left corner of the chart. We don't know where
+  // this will be until the options are available, so it's positioned here.
+  this.createRollInterface_();
+
+  this.cascadeEvents_('predraw');
+
+  // Convert the raw data (a 2D array) into the internal format and compute
+  // rolling averages.
+  this.rolledSeries_ = [null];  // x-axis is the first series and it's special
+  for (var i = 1; i < this.numColumns(); i++) {
+    // var logScale = this.attr_('logscale', i); // TODO(klausw): this looks wrong // konigsberg thinks so too.
+    var series = this.dataHandler_.extractSeries(this.rawData_, i, this.attributes_);
+    if (this.rollPeriod_ > 1) {
+      series = this.dataHandler_.rollingAverage(series, this.rollPeriod_, this.attributes_);
+    }
+
+    this.rolledSeries_.push(series);
+  }
+
+  // If the data or options have changed, then we'd better redraw.
+  this.drawGraph_();
+
+  // This is used to determine whether to do various animations.
+  var end = new Date();
+  this.drawingTimeMs_ = (end - start);
+};
+
+/**
+ * Point structure.
+ *
+ * xval_* and yval_* are the original unscaled data values,
+ * while x_* and y_* are scaled to the range (0.0-1.0) for plotting.
+ * yval_stacked is the cumulative Y value used for stacking graphs,
+ * and bottom/top/minus/plus are used for error bar graphs.
+ *
+ * @typedef {{
+ *     idx: number,
+ *     name: string,
+ *     x: ?number,
+ *     xval: ?number,
+ *     y_bottom: ?number,
+ *     y: ?number,
+ *     y_stacked: ?number,
+ *     y_top: ?number,
+ *     yval_minus: ?number,
+ *     yval: ?number,
+ *     yval_plus: ?number,
+ *     yval_stacked
+ * }}
+ */
+Dygraph.PointType = undefined;
+
+/**
+ * Calculates point stacking for stackedGraph=true.
+ *
+ * For stacking purposes, interpolate or extend neighboring data across
+ * NaN values based on stackedGraphNaNFill settings. This is for display
+ * only, the underlying data value as shown in the legend remains NaN.
+ *
+ * @param {Array.<Dygraph.PointType>} points Point array for a single series.
+ *     Updates each Point's yval_stacked property.
+ * @param {Array.<number>} cumulativeYval Accumulated top-of-graph stacked Y
+ *     values for the series seen so far. Index is the row number. Updated
+ *     based on the current series's values.
+ * @param {Array.<number>} seriesExtremes Min and max values, updated
+ *     to reflect the stacked values.
+ * @param {string} fillMethod Interpolation method, one of 'all', 'inside', or
+ *     'none'.
+ * @private
+ */
+Dygraph.stackPoints_ = function(
+    points, cumulativeYval, seriesExtremes, fillMethod) {
+  var lastXval = null;
+  var prevPoint = null;
+  var nextPoint = null;
+  var nextPointIdx = -1;
+
+  // Find the next stackable point starting from the given index.
+  var updateNextPoint = function(idx) {
+    // If we've previously found a non-NaN point and haven't gone past it yet,
+    // just use that.
+    if (nextPointIdx >= idx) return;
+
+    // We haven't found a non-NaN point yet or have moved past it,
+    // look towards the right to find a non-NaN point.
+    for (var j = idx; j < points.length; ++j) {
+      // Clear out a previously-found point (if any) since it's no longer
+      // valid, we shouldn't use it for interpolation anymore.
+      nextPoint = null;
+      if (!isNaN(points[j].yval) && points[j].yval !== null) {
+        nextPointIdx = j;
+        nextPoint = points[j];
+        break;
+      }
+    }
+  };
+
+  for (var i = 0; i < points.length; ++i) {
+    var point = points[i];
+    var xval = point.xval;
+    if (cumulativeYval[xval] === undefined) {
+      cumulativeYval[xval] = 0;
+    }
+
+    var actualYval = point.yval;
+    if (isNaN(actualYval) || actualYval === null) {
+      if(fillMethod == 'none') {
+        actualYval = 0;
+      } else {
+        // Interpolate/extend for stacking purposes if possible.
+        updateNextPoint(i);
+        if (prevPoint && nextPoint && fillMethod != 'none') {
+          // Use linear interpolation between prevPoint and nextPoint.
+          actualYval = prevPoint.yval + (nextPoint.yval - prevPoint.yval) *
+              ((xval - prevPoint.xval) / (nextPoint.xval - prevPoint.xval));
+        } else if (prevPoint && fillMethod == 'all') {
+          actualYval = prevPoint.yval;
+        } else if (nextPoint && fillMethod == 'all') {
+          actualYval = nextPoint.yval;
+        } else {
+          actualYval = 0;
+        }
+      }
+    } else {
+      prevPoint = point;
+    }
+
+    var stackedYval = cumulativeYval[xval];
+    if (lastXval != xval) {
+      // If an x-value is repeated, we ignore the duplicates.
+      stackedYval += actualYval;
+      cumulativeYval[xval] = stackedYval;
+    }
+    lastXval = xval;
+
+    point.yval_stacked = stackedYval;
+
+    if (stackedYval > seriesExtremes[1]) {
+      seriesExtremes[1] = stackedYval;
+    }
+    if (stackedYval < seriesExtremes[0]) {
+      seriesExtremes[0] = stackedYval;
+    }
+  }
+};
+
+
+/**
+ * Loop over all fields and create datasets, calculating extreme y-values for
+ * each series and extreme x-indices as we go.
+ *
+ * dateWindow is passed in as an explicit parameter so that we can compute
+ * extreme values "speculatively", i.e. without actually setting state on the
+ * dygraph.
+ *
+ * @param {Array.<Array.<Array.<(number|Array<number>)>>} rolledSeries, where
+ *     rolledSeries[seriesIndex][row] = raw point, where
+ *     seriesIndex is the column number starting with 1, and
+ *     rawPoint is [x,y] or [x, [y, err]] or [x, [y, yminus, yplus]].
+ * @param {?Array.<number>} dateWindow [xmin, xmax] pair, or null.
+ * @return {{
+ *     points: Array.<Array.<Dygraph.PointType>>,
+ *     seriesExtremes: Array.<Array.<number>>,
+ *     boundaryIds: Array.<number>}}
+ * @private
+ */
+Dygraph.prototype.gatherDatasets_ = function(rolledSeries, dateWindow) {
+  var boundaryIds = [];
+  var points = [];
+  var cumulativeYval = [];  // For stacked series.
+  var extremes = {};  // series name -> [low, high]
+  var seriesIdx, sampleIdx;
+  var firstIdx, lastIdx;
+  var axisIdx;
+
+  // Loop over the fields (series).  Go from the last to the first,
+  // because if they're stacked that's how we accumulate the values.
+  var num_series = rolledSeries.length - 1;
+  var series;
+  for (seriesIdx = num_series; seriesIdx >= 1; seriesIdx--) {
+    if (!this.visibility()[seriesIdx - 1]) continue;
+
+    // Prune down to the desired range, if necessary (for zooming)
+    // Because there can be lines going to points outside of the visible area,
+    // we actually prune to visible points, plus one on either side.
+    if (dateWindow) {
+      series = rolledSeries[seriesIdx];
+      var low = dateWindow[0];
+      var high = dateWindow[1];
+
+      // TODO(danvk): do binary search instead of linear search.
+      // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
+      firstIdx = null;
+      lastIdx = null;
+      for (sampleIdx = 0; sampleIdx < series.length; sampleIdx++) {
+        if (series[sampleIdx][0] >= low && firstIdx === null) {
+          firstIdx = sampleIdx;
+        }
+        if (series[sampleIdx][0] <= high) {
+          lastIdx = sampleIdx;
+        }
+      }
+
+      if (firstIdx === null) firstIdx = 0;
+      var correctedFirstIdx = firstIdx;
+      var isInvalidValue = true;
+      while (isInvalidValue && correctedFirstIdx > 0) {
+        correctedFirstIdx--;
+        // check if the y value is null.
+        isInvalidValue = series[correctedFirstIdx][1] === null;
+      }
+
+      if (lastIdx === null) lastIdx = series.length - 1;
+      var correctedLastIdx = lastIdx;
+      isInvalidValue = true;
+      while (isInvalidValue && correctedLastIdx < series.length - 1) {
+        correctedLastIdx++;
+        isInvalidValue = series[correctedLastIdx][1] === null;
+      }
+
+      if (correctedFirstIdx!==firstIdx) {
+        firstIdx = correctedFirstIdx;
+      }
+      if (correctedLastIdx !== lastIdx) {
+        lastIdx = correctedLastIdx;
+      }
+
+      boundaryIds[seriesIdx-1] = [firstIdx, lastIdx];
+
+      // .slice's end is exclusive, we want to include lastIdx.
+      series = series.slice(firstIdx, lastIdx + 1);
+    } else {
+      series = rolledSeries[seriesIdx];
+      boundaryIds[seriesIdx-1] = [0, series.length-1];
+    }
+
+    var seriesName = this.attr_("labels")[seriesIdx];
+    var seriesExtremes = this.dataHandler_.getExtremeYValues(series,
+        dateWindow, this.getBooleanOption("stepPlot",seriesName));
+
+    var seriesPoints = this.dataHandler_.seriesToPoints(series,
+        seriesName, boundaryIds[seriesIdx-1][0]);
+
+    if (this.getBooleanOption("stackedGraph")) {
+      axisIdx = this.attributes_.axisForSeries(seriesName);
+      if (cumulativeYval[axisIdx] === undefined) {
+        cumulativeYval[axisIdx] = [];
+      }
+      Dygraph.stackPoints_(seriesPoints, cumulativeYval[axisIdx], seriesExtremes,
+                           this.getBooleanOption("stackedGraphNaNFill"));
+    }
+
+    extremes[seriesName] = seriesExtremes;
+    points[seriesIdx] = seriesPoints;
+  }
+
+  return { points: points, extremes: extremes, boundaryIds: boundaryIds };
+};
+
+/**
+ * Update the graph with new data. This method is called when the viewing area
+ * has changed. If the underlying data or options have changed, predraw_ will
+ * be called before drawGraph_ is called.
+ *
+ * @private
+ */
+Dygraph.prototype.drawGraph_ = function() {
+  var start = new Date();
+
+  // This is used to set the second parameter to drawCallback, below.
+  var is_initial_draw = this.is_initial_draw_;
+  this.is_initial_draw_ = false;
+
+  this.layout_.removeAllDatasets();
+  this.setColors_();
+  this.attrs_.pointSize = 0.5 * this.getNumericOption('highlightCircleSize');
+
+  var packed = this.gatherDatasets_(this.rolledSeries_, this.dateWindow_);
+  var points = packed.points;
+  var extremes = packed.extremes;
+  this.boundaryIds_ = packed.boundaryIds;
+
+  this.setIndexByName_ = {};
+  var labels = this.attr_("labels");
+  var dataIdx = 0;
+  for (var i = 1; i < points.length; i++) {
+    if (!this.visibility()[i - 1]) continue;
+    this.layout_.addDataset(labels[i], points[i]);
+    this.datasetIndex_[i] = dataIdx++;
+  }
+  for (var i = 0; i < labels.length; i++) {
+    this.setIndexByName_[labels[i]] = i;
+  }
+
+  this.computeYAxisRanges_(extremes);
+  this.layout_.setYAxes(this.axes_);
+
+  this.addXTicks_();
+
+  // Tell PlotKit to use this new data and render itself
+  this.layout_.evaluate();
+  this.renderGraph_(is_initial_draw);
+
+  if (this.getStringOption("timingName")) {
+    var end = new Date();
+    console.log(this.getStringOption("timingName") + " - drawGraph: " + (end - start) + "ms");
+  }
+};
+
+/**
+ * This does the work of drawing the chart. It assumes that the layout and axis
+ * scales have already been set (e.g. by predraw_).
+ *
+ * @private
+ */
+Dygraph.prototype.renderGraph_ = function(is_initial_draw) {
+  this.cascadeEvents_('clearChart');
+  this.plotter_.clear();
+
+  const underlayCallback = this.getFunctionOption('underlayCallback');
+  if (underlayCallback) {
+    // NOTE: we pass the dygraph object to this callback twice to avoid breaking
+    // users who expect a deprecated form of this callback.
+    underlayCallback.call(this,
+        this.hidden_ctx_, this.layout_.getPlotArea(), this, this);
+  }
+
+  var e = {
+    canvas: this.hidden_,
+    drawingContext: this.hidden_ctx_
+  };
+  this.cascadeEvents_('willDrawChart', e);
+  this.plotter_.render();
+  this.cascadeEvents_('didDrawChart', e);
+  this.lastRow_ = -1;  // because plugins/legend.js clears the legend
+
+  // TODO(danvk): is this a performance bottleneck when panning?
+  // The interaction canvas should already be empty in that situation.
+  this.canvas_.getContext('2d').clearRect(0, 0, this.width_, this.height_);
+
+  const drawCallback = this.getFunctionOption("drawCallback");
+  if (drawCallback !== null) {
+    drawCallback.call(this, this, is_initial_draw);
+  }
+  if (is_initial_draw) {
+    this.readyFired_ = true;
+    while (this.readyFns_.length > 0) {
+      var fn = this.readyFns_.pop();
+      fn(this);
+    }
+  }
+};
+
+/**
+ * @private
+ * Determine properties of the y-axes which are independent of the data
+ * currently being displayed. This includes things like the number of axes and
+ * the style of the axes. It does not include the range of each axis and its
+ * tick marks.
+ * This fills in this.axes_.
+ * axes_ = [ { options } ]
+ *   indices are into the axes_ array.
+ */
+Dygraph.prototype.computeYAxes_ = function() {
+  var axis, index, opts, v;
+
+  // this.axes_ doesn't match this.attributes_.axes_.options. It's used for
+  // data computation as well as options storage.
+  // Go through once and add all the axes.
+  this.axes_ = [];
+
+  for (axis = 0; axis < this.attributes_.numAxes(); axis++) {
+    // Add a new axis, making a copy of its per-axis options.
+    opts = { g : this };
+    utils.update(opts, this.attributes_.axisOptions(axis));
+    this.axes_[axis] = opts;
+  }
+
+  for (axis = 0; axis < this.axes_.length; axis++) {
+    if (axis === 0) {
+      opts = this.optionsViewForAxis_('y' + (axis ? '2' : ''));
+      v = opts("valueRange");
+      if (v) this.axes_[axis].valueRange = v;
+    } else {  // To keep old behavior
+      var axes = this.user_attrs_.axes;
+      if (axes && axes.y2) {
+        v = axes.y2.valueRange;
+        if (v) this.axes_[axis].valueRange = v;
+      }
+    }
+  }
+};
+
+/**
+ * Returns the number of y-axes on the chart.
+ * @return {number} the number of axes.
+ */
+Dygraph.prototype.numAxes = function() {
+  return this.attributes_.numAxes();
+};
+
+/**
+ * @private
+ * Returns axis properties for the given series.
+ * @param {string} setName The name of the series for which to get axis
+ * properties, e.g. 'Y1'.
+ * @return {Object} The axis properties.
+ */
+Dygraph.prototype.axisPropertiesForSeries = function(series) {
+  // TODO(danvk): handle errors.
+  return this.axes_[this.attributes_.axisForSeries(series)];
+};
+
+/**
+ * @private
+ * Determine the value range and tick marks for each axis.
+ * @param {Object} extremes A mapping from seriesName -> [low, high]
+ * This fills in the valueRange and ticks fields in each entry of this.axes_.
+ */
+Dygraph.prototype.computeYAxisRanges_ = function(extremes) {
+  var isNullUndefinedOrNaN = function(num) {
+    return isNaN(parseFloat(num));
+  };
+  var numAxes = this.attributes_.numAxes();
+  var ypadCompat, span, series, ypad;
+
+  var p_axis;
+
+  // Compute extreme values, a span and tick marks for each axis.
+  for (var i = 0; i < numAxes; i++) {
+    var axis = this.axes_[i];
+    var logscale = this.attributes_.getForAxis("logscale", i);
+    var includeZero = this.attributes_.getForAxis("includeZero", i);
+    var independentTicks = this.attributes_.getForAxis("independentTicks", i);
+    series = this.attributes_.seriesForAxis(i);
+
+    // Add some padding. This supports two Y padding operation modes:
+    //
+    // - backwards compatible (yRangePad not set):
+    //   10% padding for automatic Y ranges, but not for user-supplied
+    //   ranges, and move a close-to-zero edge to zero, since drawing at the edge
+    //   results in invisible lines. Unfortunately lines drawn at the edge of a
+    //   user-supplied range will still be invisible. If logscale is
+    //   set, add a variable amount of padding at the top but
+    //   none at the bottom.
+    //
+    // - new-style (yRangePad set by the user):
+    //   always add the specified Y padding.
+    //
+    ypadCompat = true;
+    ypad = 0.1; // add 10%
+    const yRangePad = this.getNumericOption('yRangePad');
+    if (yRangePad !== null) {
+      ypadCompat = false;
+      // Convert pixel padding to ratio
+      ypad = yRangePad / this.plotter_.area.h;
+    }
+
+    if (series.length === 0) {
+      // If no series are defined or visible then use a reasonable default
+      axis.extremeRange = [0, 1];
+    } else {
+      // Calculate the extremes of extremes.
+      var minY = Infinity;  // extremes[series[0]][0];
+      var maxY = -Infinity;  // extremes[series[0]][1];
+      var extremeMinY, extremeMaxY;
+
+      for (var j = 0; j < series.length; j++) {
+        // this skips invisible series
+        if (!extremes.hasOwnProperty(series[j])) continue;
+
+        // Only use valid extremes to stop null data series' from corrupting the scale.
+        extremeMinY = extremes[series[j]][0];
+        if (extremeMinY !== null) {
+          minY = Math.min(extremeMinY, minY);
+        }
+        extremeMaxY = extremes[series[j]][1];
+        if (extremeMaxY !== null) {
+          maxY = Math.max(extremeMaxY, maxY);
+        }
+      }
+
+      // Include zero if requested by the user.
+      if (includeZero && !logscale) {
+        if (minY > 0) minY = 0;
+        if (maxY < 0) maxY = 0;
+      }
+
+      // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
+      if (minY == Infinity) minY = 0;
+      if (maxY == -Infinity) maxY = 1;
+
+      span = maxY - minY;
+      // special case: if we have no sense of scale, center on the sole value.
+      if (span === 0) {
+        if (maxY !== 0) {
+          span = Math.abs(maxY);
+        } else {
+          // ... and if the sole value is zero, use range 0-1.
+          maxY = 1;
+          span = 1;
+        }
+      }
+
+      var maxAxisY = maxY, minAxisY = minY;
+      if (ypadCompat) {
+        if (logscale) {
+          maxAxisY = maxY + ypad * span;
+          minAxisY = minY;
+        } else {
+          maxAxisY = maxY + ypad * span;
+          minAxisY = minY - ypad * span;
+
+          // Backwards-compatible behavior: Move the span to start or end at zero if it's
+          // close to zero.
+          if (minAxisY < 0 && minY >= 0) minAxisY = 0;
+          if (maxAxisY > 0 && maxY <= 0) maxAxisY = 0;
+        }
+      }
+      axis.extremeRange = [minAxisY, maxAxisY];
+    }
+    if (axis.valueRange) {
+      // This is a user-set value range for this axis.
+      var y0 = isNullUndefinedOrNaN(axis.valueRange[0]) ? axis.extremeRange[0] : axis.valueRange[0];
+      var y1 = isNullUndefinedOrNaN(axis.valueRange[1]) ? axis.extremeRange[1] : axis.valueRange[1];
+      axis.computedValueRange = [y0, y1];
+    } else {
+      axis.computedValueRange = axis.extremeRange;
+    }
+    if (!ypadCompat) {
+      // When using yRangePad, adjust the upper/lower bounds to add
+      // padding unless the user has zoomed/panned the Y axis range.
+
+      y0 = axis.computedValueRange[0];
+      y1 = axis.computedValueRange[1];
+
+      // special case #781: if we have no sense of scale, center on the sole value.
+      if (y0 === y1) {
+          y0 -= 0.5;
+          y1 += 0.5;
+      }
+
+      if (logscale) {
+        var y0pct = ypad / (2 * ypad - 1);
+        var y1pct = (ypad - 1) / (2 * ypad - 1);
+        axis.computedValueRange[0] = utils.logRangeFraction(y0, y1, y0pct);
+        axis.computedValueRange[1] = utils.logRangeFraction(y0, y1, y1pct);
+      } else {
+        span = y1 - y0;
+        axis.computedValueRange[0] = y0 - span * ypad;
+        axis.computedValueRange[1] = y1 + span * ypad;
+      }
+    }
+
+
+    if (independentTicks) {
+      axis.independentTicks = independentTicks;
+      var opts = this.optionsViewForAxis_('y' + (i ? '2' : ''));
+      var ticker = opts('ticker');
+      axis.ticks = ticker(axis.computedValueRange[0],
+              axis.computedValueRange[1],
+              this.plotter_.area.h,
+              opts,
+              this);
+      // Define the first independent axis as primary axis.
+      if (!p_axis) p_axis = axis;
+    }
+  }
+  if (p_axis === undefined) {
+    throw ("Configuration Error: At least one axis has to have the \"independentTicks\" option activated.");
+  }
+  // Add ticks. By default, all axes inherit the tick positions of the
+  // primary axis. However, if an axis is specifically marked as having
+  // independent ticks, then that is permissible as well.
+  for (var i = 0; i < numAxes; i++) {
+    var axis = this.axes_[i];
+
+    if (!axis.independentTicks) {
+      var opts = this.optionsViewForAxis_('y' + (i ? '2' : ''));
+      var ticker = opts('ticker');
+      var p_ticks = p_axis.ticks;
+      var p_scale = p_axis.computedValueRange[1] - p_axis.computedValueRange[0];
+      var scale = axis.computedValueRange[1] - axis.computedValueRange[0];
+      var tick_values = [];
+      for (var k = 0; k < p_ticks.length; k++) {
+        var y_frac = (p_ticks[k].v - p_axis.computedValueRange[0]) / p_scale;
+        var y_val = axis.computedValueRange[0] + y_frac * scale;
+        tick_values.push(y_val);
+      }
+
+      axis.ticks = ticker(axis.computedValueRange[0],
+                          axis.computedValueRange[1],
+                          this.plotter_.area.h,
+                          opts,
+                          this,
+                          tick_values);
+    }
+  }
+};
+
+/**
+ * Detects the type of the str (date or numeric) and sets the various
+ * formatting attributes in this.attrs_ based on this type.
+ * @param {string} str An x value.
+ * @private
+ */
+Dygraph.prototype.detectTypeFromString_ = function(str) {
+  var isDate = false;
+  var dashPos = str.indexOf('-');  // could be 2006-01-01 _or_ 1.0e-2
+  if ((dashPos > 0 && (str[dashPos-1] != 'e' && str[dashPos-1] != 'E')) ||
+      str.indexOf('/') >= 0 ||
+      isNaN(parseFloat(str))) {
+    isDate = true;
+  } else if (str.length == 8 && str > '19700101' && str < '20371231') {
+    // TODO(danvk): remove support for this format.
+    isDate = true;
+  }
+
+  this.setXAxisOptions_(isDate);
+};
+
+Dygraph.prototype.setXAxisOptions_ = function(isDate) {
+  if (isDate) {
+    this.attrs_.xValueParser = utils.dateParser;
+    this.attrs_.axes.x.valueFormatter = utils.dateValueFormatter;
+    this.attrs_.axes.x.ticker = DygraphTickers.dateTicker;
+    this.attrs_.axes.x.axisLabelFormatter = utils.dateAxisLabelFormatter;
+  } else {
+    /** @private (shut up, jsdoc!) */
+    this.attrs_.xValueParser = function(x) { return parseFloat(x); };
+    // TODO(danvk): use Dygraph.numberValueFormatter here?
+    /** @private (shut up, jsdoc!) */
+    this.attrs_.axes.x.valueFormatter = function(x) { return x; };
+    this.attrs_.axes.x.ticker = DygraphTickers.numericTicks;
+    this.attrs_.axes.x.axisLabelFormatter = this.attrs_.axes.x.valueFormatter;
+  }
+};
+
+/**
+ * @private
+ * Parses a string in a special csv format.  We expect a csv file where each
+ * line is a date point, and the first field in each line is the date string.
+ * We also expect that all remaining fields represent series.
+ * if the errorBars attribute is set, then interpret the fields as:
+ * date, series1, stddev1, series2, stddev2, ...
+ * @param {[Object]} data See above.
+ *
+ * @return [Object] An array with one entry for each row. These entries
+ * are an array of cells in that row. The first entry is the parsed x-value for
+ * the row. The second, third, etc. are the y-values. These can take on one of
+ * three forms, depending on the CSV and constructor parameters:
+ * 1. numeric value
+ * 2. [ value, stddev ]
+ * 3. [ low value, center value, high value ]
+ */
+Dygraph.prototype.parseCSV_ = function(data) {
+  var ret = [];
+  var line_delimiter = utils.detectLineDelimiter(data);
+  var lines = data.split(line_delimiter || "\n");
+  var vals, j;
+
+  // Use the default delimiter or fall back to a tab if that makes sense.
+  var delim = this.getStringOption('delimiter');
+  if (lines[0].indexOf(delim) == -1 && lines[0].indexOf('\t') >= 0) {
+    delim = '\t';
+  }
+
+  var start = 0;
+  if (!('labels' in this.user_attrs_)) {
+    // User hasn't explicitly set labels, so they're (presumably) in the CSV.
+    start = 1;
+    this.attrs_.labels = lines[0].split(delim);  // NOTE: _not_ user_attrs_.
+    this.attributes_.reparseSeries();
+  }
+  var line_no = 0;
+
+  var xParser;
+  var defaultParserSet = false;  // attempt to auto-detect x value type
+  var expectedCols = this.attr_("labels").length;
+  var outOfOrder = false;
+  for (var i = start; i < lines.length; i++) {
+    var line = lines[i];
+    line_no = i;
+    if (line.length === 0) continue;  // skip blank lines
+    if (line[0] == '#') continue;    // skip comment lines
+    var inFields = line.split(delim);
+    if (inFields.length < 2) continue;
+
+    var fields = [];
+    if (!defaultParserSet) {
+      this.detectTypeFromString_(inFields[0]);
+      xParser = this.getFunctionOption("xValueParser");
+      defaultParserSet = true;
+    }
+    fields[0] = xParser(inFields[0], this);
+
+    // If fractions are expected, parse the numbers as "A/B"
+    if (this.fractions_) {
+      for (j = 1; j < inFields.length; j++) {
+        // TODO(danvk): figure out an appropriate way to flag parse errors.
+        vals = inFields[j].split("/");
+        if (vals.length != 2) {
+          console.error('Expected fractional "num/den" values in CSV data ' +
+                        "but found a value '" + inFields[j] + "' on line " +
+                        (1 + i) + " ('" + line + "') which is not of this form.");
+          fields[j] = [0, 0];
+        } else {
+          fields[j] = [utils.parseFloat_(vals[0], i, line),
+                       utils.parseFloat_(vals[1], i, line)];
+        }
+      }
+    } else if (this.getBooleanOption("errorBars")) {
+      // If there are error bars, values are (value, stddev) pairs
+      if (inFields.length % 2 != 1) {
+        console.error('Expected alternating (value, stdev.) pairs in CSV data ' +
+                      'but line ' + (1 + i) + ' has an odd number of values (' +
+                      (inFields.length - 1) + "): '" + line + "'");
+      }
+      for (j = 1; j < inFields.length; j += 2) {
+        fields[(j + 1) / 2] = [utils.parseFloat_(inFields[j], i, line),
+                               utils.parseFloat_(inFields[j + 1], i, line)];
+      }
+    } else if (this.getBooleanOption("customBars")) {
+      // Bars are a low;center;high tuple
+      for (j = 1; j < inFields.length; j++) {
+        var val = inFields[j];
+        if (/^ *$/.test(val)) {
+          fields[j] = [null, null, null];
+        } else {
+          vals = val.split(";");
+          if (vals.length == 3) {
+            fields[j] = [ utils.parseFloat_(vals[0], i, line),
+                          utils.parseFloat_(vals[1], i, line),
+                          utils.parseFloat_(vals[2], i, line) ];
+          } else {
+            console.warn('When using customBars, values must be either blank ' +
+                         'or "low;center;high" tuples (got "' + val +
+                         '" on line ' + (1+i));
+          }
+        }
+      }
+    } else {
+      // Values are just numbers
+      for (j = 1; j < inFields.length; j++) {
+        fields[j] = utils.parseFloat_(inFields[j], i, line);
+      }
+    }
+    if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
+      outOfOrder = true;
+    }
+
+    if (fields.length != expectedCols) {
+      console.error("Number of columns in line " + i + " (" + fields.length +
+                    ") does not agree with number of labels (" + expectedCols +
+                    ") " + line);
+    }
+
+    // If the user specified the 'labels' option and none of the cells of the
+    // first row parsed correctly, then they probably double-specified the
+    // labels. We go with the values set in the option, discard this row and
+    // log a warning to the JS console.
+    if (i === 0 && this.attr_('labels')) {
+      var all_null = true;
+      for (j = 0; all_null && j < fields.length; j++) {
+        if (fields[j]) all_null = false;
+      }
+      if (all_null) {
+        console.warn("The dygraphs 'labels' option is set, but the first row " +
+                     "of CSV data ('" + line + "') appears to also contain " +
+                     "labels. Will drop the CSV labels and use the option " +
+                     "labels.");
+        continue;
+      }
+    }
+    ret.push(fields);
+  }
+
+  if (outOfOrder) {
+    console.warn("CSV is out of order; order it correctly to speed loading.");
+    ret.sort(function(a,b) { return a[0] - b[0]; });
+  }
+
+  return ret;
+};
+
+// In native format, all values must be dates or numbers.
+// This check isn't perfect but will catch most mistaken uses of strings.
+function validateNativeFormat(data) {
+  const firstRow = data[0];
+  const firstX = firstRow[0];
+  if (typeof firstX !== 'number' && !utils.isDateLike(firstX)) {
+    throw new Error(`Expected number or date but got ${typeof firstX}: ${firstX}.`);
+  }
+  for (let i = 1; i < firstRow.length; i++) {
+    const val = firstRow[i];
+    if (val === null || val === undefined) continue;
+    if (typeof val === 'number') continue;
+    if (utils.isArrayLike(val)) continue;  // e.g. error bars or custom bars.
+    throw new Error(`Expected number or array but got ${typeof val}: ${val}.`);
+  }
+}
+
+/**
+ * The user has provided their data as a pre-packaged JS array. If the x values
+ * are numeric, this is the same as dygraphs' internal format. If the x values
+ * are dates, we need to convert them from Date objects to ms since epoch.
+ * @param {!Array} data
+ * @return {Object} data with numeric x values.
+ * @private
+ */
+Dygraph.prototype.parseArray_ = function(data) {
+  // Peek at the first x value to see if it's numeric.
+  if (data.length === 0) {
+    console.error("Can't plot empty data set");
+    return null;
+  }
+  if (data[0].length === 0) {
+    console.error("Data set cannot contain an empty row");
+    return null;
+  }
+
+  validateNativeFormat(data);
+
+  var i;
+  if (this.attr_("labels") === null) {
+    console.warn("Using default labels. Set labels explicitly via 'labels' " +
+                 "in the options parameter");
+    this.attrs_.labels = [ "X" ];
+    for (i = 1; i < data[0].length; i++) {
+      this.attrs_.labels.push("Y" + i); // Not user_attrs_.
+    }
+    this.attributes_.reparseSeries();
+  } else {
+    var num_labels = this.attr_("labels");
+    if (num_labels.length != data[0].length) {
+      console.error("Mismatch between number of labels (" + num_labels + ")" +
+                    " and number of columns in array (" + data[0].length + ")");
+      return null;
+    }
+  }
+
+  if (utils.isDateLike(data[0][0])) {
+    // Some intelligent defaults for a date x-axis.
+    this.attrs_.axes.x.valueFormatter = utils.dateValueFormatter;
+    this.attrs_.axes.x.ticker = DygraphTickers.dateTicker;
+    this.attrs_.axes.x.axisLabelFormatter = utils.dateAxisLabelFormatter;
+
+    // Assume they're all dates.
+    var parsedData = utils.clone(data);
+    for (i = 0; i < data.length; i++) {
+      if (parsedData[i].length === 0) {
+        console.error("Row " + (1 + i) + " of data is empty");
+        return null;
+      }
+      if (parsedData[i][0] === null ||
+          typeof(parsedData[i][0].getTime) != 'function' ||
+          isNaN(parsedData[i][0].getTime())) {
+        console.error("x value in row " + (1 + i) + " is not a Date");
+        return null;
+      }
+      parsedData[i][0] = parsedData[i][0].getTime();
+    }
+    return parsedData;
+  } else {
+    // Some intelligent defaults for a numeric x-axis.
+    /** @private (shut up, jsdoc!) */
+    this.attrs_.axes.x.valueFormatter = function(x) { return x; };
+    this.attrs_.axes.x.ticker = DygraphTickers.numericTicks;
+    this.attrs_.axes.x.axisLabelFormatter = utils.numberAxisLabelFormatter;
+    return data;
+  }
+};
+
+/**
+ * Parses a DataTable object from gviz.
+ * The data is expected to have a first column that is either a date or a
+ * number. All subsequent columns must be numbers. If there is a clear mismatch
+ * between this.xValueParser_ and the type of the first column, it will be
+ * fixed. Fills out rawData_.
+ * @param {!google.visualization.DataTable} data See above.
+ * @private
+ */
+Dygraph.prototype.parseDataTable_ = function(data) {
+  var shortTextForAnnotationNum = function(num) {
+    // converts [0-9]+ [A-Z][a-z]*
+    // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
+    // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
+    var shortText = String.fromCharCode(65 /* A */ + num % 26);
+    num = Math.floor(num / 26);
+    while ( num > 0 ) {
+      shortText = String.fromCharCode(65 /* A */ + (num - 1) % 26 ) + shortText.toLowerCase();
+      num = Math.floor((num - 1) / 26);
+    }
+    return shortText;
+  };
+
+  var cols = data.getNumberOfColumns();
+  var rows = data.getNumberOfRows();
+
+  var indepType = data.getColumnType(0);
+  if (indepType == 'date' || indepType == 'datetime') {
+    this.attrs_.xValueParser = utils.dateParser;
+    this.attrs_.axes.x.valueFormatter = utils.dateValueFormatter;
+    this.attrs_.axes.x.ticker = DygraphTickers.dateTicker;
+    this.attrs_.axes.x.axisLabelFormatter = utils.dateAxisLabelFormatter;
+  } else if (indepType == 'number') {
+    this.attrs_.xValueParser = function(x) { return parseFloat(x); };
+    this.attrs_.axes.x.valueFormatter = function(x) { return x; };
+    this.attrs_.axes.x.ticker = DygraphTickers.numericTicks;
+    this.attrs_.axes.x.axisLabelFormatter = this.attrs_.axes.x.valueFormatter;
+  } else {
+    throw new Error(
+          "only 'date', 'datetime' and 'number' types are supported " +
+          "for column 1 of DataTable input (Got '" + indepType + "')");
+  }
+
+  // Array of the column indices which contain data (and not annotations).
+  var colIdx = [];
+  var annotationCols = {};  // data index -> [annotation cols]
+  var hasAnnotations = false;
+  var i, j;
+  for (i = 1; i < cols; i++) {
+    var type = data.getColumnType(i);
+    if (type == 'number') {
+      colIdx.push(i);
+    } else if (type == 'string' && this.getBooleanOption('displayAnnotations')) {
+      // This is OK -- it's an annotation column.
+      var dataIdx = colIdx[colIdx.length - 1];
+      if (!annotationCols.hasOwnProperty(dataIdx)) {
+        annotationCols[dataIdx] = [i];
+      } else {
+        annotationCols[dataIdx].push(i);
+      }
+      hasAnnotations = true;
+    } else {
+      throw new Error(
+          "Only 'number' is supported as a dependent type with Gviz." +
+          " 'string' is only supported if displayAnnotations is true");
+    }
+  }
+
+  // Read column labels
+  // TODO(danvk): add support back for errorBars
+  var labels = [data.getColumnLabel(0)];
+  for (i = 0; i < colIdx.length; i++) {
+    labels.push(data.getColumnLabel(colIdx[i]));
+    if (this.getBooleanOption("errorBars")) i += 1;
+  }
+  this.attrs_.labels = labels;
+  cols = labels.length;
+
+  var ret = [];
+  var outOfOrder = false;
+  var annotations = [];
+  for (i = 0; i < rows; i++) {
+    var row = [];
+    if (typeof(data.getValue(i, 0)) === 'undefined' ||
+        data.getValue(i, 0) === null) {
+      console.warn("Ignoring row " + i +
+                   " of DataTable because of undefined or null first column.");
+      continue;
+    }
+
+    if (indepType == 'date' || indepType == 'datetime') {
+      row.push(data.getValue(i, 0).getTime());
+    } else {
+      row.push(data.getValue(i, 0));
+    }
+    if (!this.getBooleanOption("errorBars")) {
+      for (j = 0; j < colIdx.length; j++) {
+        var col = colIdx[j];
+        row.push(data.getValue(i, col));
+        if (hasAnnotations &&
+            annotationCols.hasOwnProperty(col) &&
+            data.getValue(i, annotationCols[col][0]) !== null) {
+          var ann = {};
+          ann.series = data.getColumnLabel(col);
+          ann.xval = row[0];
+          ann.shortText = shortTextForAnnotationNum(annotations.length);
+          ann.text = '';
+          for (var k = 0; k < annotationCols[col].length; k++) {
+            if (k) ann.text += "\n";
+            ann.text += data.getValue(i, annotationCols[col][k]);
+          }
+          annotations.push(ann);
+        }
+      }
+
+      // Strip out infinities, which give dygraphs problems later on.
+      for (j = 0; j < row.length; j++) {
+        if (!isFinite(row[j])) row[j] = null;
+      }
+    } else {
+      for (j = 0; j < cols - 1; j++) {
+        row.push([ data.getValue(i, 1 + 2 * j), data.getValue(i, 2 + 2 * j) ]);
+      }
+    }
+    if (ret.length > 0 && row[0] < ret[ret.length - 1][0]) {
+      outOfOrder = true;
+    }
+    ret.push(row);
+  }
+
+  if (outOfOrder) {
+    console.warn("DataTable is out of order; order it correctly to speed loading.");
+    ret.sort(function(a,b) { return a[0] - b[0]; });
+  }
+  this.rawData_ = ret;
+
+  if (annotations.length > 0) {
+    this.setAnnotations(annotations, true);
+  }
+  this.attributes_.reparseSeries();
+};
+
+/**
+ * Signals to plugins that the chart data has updated.
+ * This happens after the data has updated but before the chart has redrawn.
+ * @private
+ */
+Dygraph.prototype.cascadeDataDidUpdateEvent_ = function() {
+  // TODO(danvk): there are some issues checking xAxisRange() and using
+  // toDomCoords from handlers of this event. The visible range should be set
+  // when the chart is drawn, not derived from the data.
+  this.cascadeEvents_('dataDidUpdate', {});
+};
+
+/**
+ * Get the CSV data. If it's in a function, call that function. If it's in a
+ * file, do an XMLHttpRequest to get it.
+ * @private
+ */
+Dygraph.prototype.start_ = function() {
+  var data = this.file_;
+
+  // Functions can return references of all other types.
+  if (typeof data == 'function') {
+    data = data();
+  }
+
+  if (utils.isArrayLike(data)) {
+    this.rawData_ = this.parseArray_(data);
+    this.cascadeDataDidUpdateEvent_();
+    this.predraw_();
+  } else if (typeof data == 'object' &&
+             typeof data.getColumnRange == 'function') {
+    // must be a DataTable from gviz.
+    this.parseDataTable_(data);
+    this.cascadeDataDidUpdateEvent_();
+    this.predraw_();
+  } else if (typeof data == 'string') {
+    // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
+    var line_delimiter = utils.detectLineDelimiter(data);
+    if (line_delimiter) {
+      this.loadedEvent_(data);
+    } else {
+      // REMOVE_FOR_IE
+      var req;
+      if (window.XMLHttpRequest) {
+        // Firefox, Opera, IE7, and other browsers will use the native object
+        req = new XMLHttpRequest();
+      } else {
+        // IE 5 and 6 will use the ActiveX control
+        req = new ActiveXObject("Microsoft.XMLHTTP");
+      }
+
+      var caller = this;
+      req.onreadystatechange = function () {
+        if (req.readyState == 4) {
+          if (req.status === 200 ||  // Normal http
+              req.status === 0) {    // Chrome w/ --allow-file-access-from-files
+            caller.loadedEvent_(req.responseText);
+          }
+        }
+      };
+
+      req.open("GET", data, true);
+      req.send(null);
+    }
+  } else {
+    console.error("Unknown data format: " + (typeof data));
+  }
+};
+
+/**
+ * Changes various properties of the graph. These can include:
+ * <ul>
+ * <li>file: changes the source data for the graph</li>
+ * <li>errorBars: changes whether the data contains stddev</li>
+ * </ul>
+ *
+ * There's a huge variety of options that can be passed to this method. For a
+ * full list, see http://dygraphs.com/options.html.
+ *
+ * @param {Object} input_attrs The new properties and values
+ * @param {boolean} block_redraw Usually the chart is redrawn after every
+ *     call to updateOptions(). If you know better, you can pass true to
+ *     explicitly block the redraw. This can be useful for chaining
+ *     updateOptions() calls, avoiding the occasional infinite loop and
+ *     preventing redraws when it's not necessary (e.g. when updating a
+ *     callback).
+ */
+Dygraph.prototype.updateOptions = function(input_attrs, block_redraw) {
+  if (typeof(block_redraw) == 'undefined') block_redraw = false;
+
+  // copyUserAttrs_ drops the "file" parameter as a convenience to us.
+  var file = input_attrs.file;
+  var attrs = Dygraph.copyUserAttrs_(input_attrs);
+
+  // TODO(danvk): this is a mess. Move these options into attr_.
+  if ('rollPeriod' in attrs) {
+    this.rollPeriod_ = attrs.rollPeriod;
+  }
+  if ('dateWindow' in attrs) {
+    this.dateWindow_ = attrs.dateWindow;
+  }
+
+  // TODO(danvk): validate per-series options.
+  // Supported:
+  // strokeWidth
+  // pointSize
+  // drawPoints
+  // highlightCircleSize
+
+  // Check if this set options will require new points.
+  var requiresNewPoints = utils.isPixelChangingOptionList(this.attr_("labels"), attrs);
+
+  utils.updateDeep(this.user_attrs_, attrs);
+
+  this.attributes_.reparseSeries();
+
+  if (file) {
+    // This event indicates that the data is about to change, but hasn't yet.
+    // TODO(danvk): support cancellation of the update via this event.
+    this.cascadeEvents_('dataWillUpdate', {});
+
+    this.file_ = file;
+    if (!block_redraw) this.start_();
+  } else {
+    if (!block_redraw) {
+      if (requiresNewPoints) {
+        this.predraw_();
+      } else {
+        this.renderGraph_(false);
+      }
+    }
+  }
+};
+
+/**
+ * Make a copy of input attributes, removing file as a convenience.
+ * @private
+ */
+Dygraph.copyUserAttrs_ = function(attrs) {
+  var my_attrs = {};
+  for (var k in attrs) {
+    if (!attrs.hasOwnProperty(k)) continue;
+    if (k == 'file') continue;
+    if (attrs.hasOwnProperty(k)) my_attrs[k] = attrs[k];
+  }
+  return my_attrs;
+};
+
+/**
+ * Resizes the dygraph. If no parameters are specified, resizes to fill the
+ * containing div (which has presumably changed size since the dygraph was
+ * instantiated. If the width/height are specified, the div will be resized.
+ *
+ * This is far more efficient than destroying and re-instantiating a
+ * Dygraph, since it doesn't have to reparse the underlying data.
+ *
+ * @param {number} width Width (in pixels)
+ * @param {number} height Height (in pixels)
+ */
+Dygraph.prototype.resize = function(width, height) {
+  if (this.resize_lock) {
+    return;
+  }
+  this.resize_lock = true;
+
+  if ((width === null) != (height === null)) {
+    console.warn("Dygraph.resize() should be called with zero parameters or " +
+                 "two non-NULL parameters. Pretending it was zero.");
+    width = height = null;
+  }
+
+  var old_width = this.width_;
+  var old_height = this.height_;
+
+  if (width) {
+    this.maindiv_.style.width = width + "px";
+    this.maindiv_.style.height = height + "px";
+    this.width_ = width;
+    this.height_ = height;
+  } else {
+    this.width_ = this.maindiv_.clientWidth;
+    this.height_ = this.maindiv_.clientHeight;
+  }
+
+  if (old_width != this.width_ || old_height != this.height_) {
+    // Resizing a canvas erases it, even when the size doesn't change, so
+    // any resize needs to be followed by a redraw.
+    this.resizeElements_();
+    this.predraw_();
+  }
+
+  this.resize_lock = false;
+};
+
+/**
+ * Adjusts the number of points in the rolling average. Updates the graph to
+ * reflect the new averaging period.
+ * @param {number} length Number of points over which to average the data.
+ */
+Dygraph.prototype.adjustRoll = function(length) {
+  this.rollPeriod_ = length;
+  this.predraw_();
+};
+
+/**
+ * Returns a boolean array of visibility statuses.
+ */
+Dygraph.prototype.visibility = function() {
+  // Do lazy-initialization, so that this happens after we know the number of
+  // data series.
+  if (!this.getOption("visibility")) {
+    this.attrs_.visibility = [];
+  }
+  // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs.
+  while (this.getOption("visibility").length < this.numColumns() - 1) {
+    this.attrs_.visibility.push(true);
+  }
+  return this.getOption("visibility");
+};
+
+/**
+ * Changes the visibility of one or more series.
+ *
+ * @param {number|number[]|object} num the series index or an array of series indices
+ *                                     or a boolean array of visibility states by index
+ *                                     or an object mapping series numbers, as keys, to
+ *                                     visibility state (boolean values)
+ * @param {boolean} value the visibility state expressed as a boolean
+ */
+Dygraph.prototype.setVisibility = function(num, value) {
+  var x = this.visibility();
+  var numIsObject = false;
+
+  if (!Array.isArray(num)) {
+    if (num !== null && typeof num === 'object') {
+      numIsObject = true;
+    } else {
+      num = [num];
+    }
+  }
+
+  if (numIsObject) {
+    for (var i in num) {
+      if (num.hasOwnProperty(i)) {
+        if (i < 0 || i >= x.length) {
+          console.warn("Invalid series number in setVisibility: " + i);
+        } else {
+          x[i] = num[i];
+        }
+      }
+    }
+  } else {
+    for (var i = 0; i < num.length; i++) {
+      if (typeof num[i] === 'boolean') {
+        if (i >= x.length) {
+          console.warn("Invalid series number in setVisibility: " + i);
+        } else {
+          x[i] = num[i];
+        }
+      } else {
+        if (num[i] < 0 || num[i] >= x.length) {
+          console.warn("Invalid series number in setVisibility: " + num[i]);
+        } else {
+          x[num[i]] = value;
+        }
+      }
+    }
+  }
+
+  this.predraw_();
+};
+
+/**
+ * How large of an area will the dygraph render itself in?
+ * This is used for testing.
+ * @return A {width: w, height: h} object.
+ * @private
+ */
+Dygraph.prototype.size = function() {
+  return { width: this.width_, height: this.height_ };
+};
+
+/**
+ * Update the list of annotations and redraw the chart.
+ * See dygraphs.com/annotations.html for more info on how to use annotations.
+ * @param ann {Array} An array of annotation objects.
+ * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
+ */
+Dygraph.prototype.setAnnotations = function(ann, suppressDraw) {
+  // Only add the annotation CSS rule once we know it will be used.
+  this.annotations_ = ann;
+  if (!this.layout_) {
+    console.warn("Tried to setAnnotations before dygraph was ready. " +
+                 "Try setting them in a ready() block. See " +
+                 "dygraphs.com/tests/annotation.html");
+    return;
+  }
+
+  this.layout_.setAnnotations(this.annotations_);
+  if (!suppressDraw) {
+    this.predraw_();
+  }
+};
+
+/**
+ * Return the list of annotations.
+ */
+Dygraph.prototype.annotations = function() {
+  return this.annotations_;
+};
+
+/**
+ * Get the list of label names for this graph. The first column is the
+ * x-axis, so the data series names start at index 1.
+ *
+ * Returns null when labels have not yet been defined.
+ */
+Dygraph.prototype.getLabels = function() {
+  var labels = this.attr_("labels");
+  return labels ? labels.slice() : null;
+};
+
+/**
+ * Get the index of a series (column) given its name. The first column is the
+ * x-axis, so the data series start with index 1.
+ */
+Dygraph.prototype.indexFromSetName = function(name) {
+  return this.setIndexByName_[name];
+};
+
+/**
+ * Find the row number corresponding to the given x-value.
+ * Returns null if there is no such x-value in the data.
+ * If there are multiple rows with the same x-value, this will return the
+ * first one.
+ * @param {number} xVal The x-value to look for (e.g. millis since epoch).
+ * @return {?number} The row number, which you can pass to getValue(), or null.
+ */
+Dygraph.prototype.getRowForX = function(xVal) {
+  var low = 0,
+      high = this.numRows() - 1;
+
+  while (low <= high) {
+    var idx = (high + low) >> 1;
+    var x = this.getValue(idx, 0);
+    if (x < xVal) {
+      low = idx + 1;
+    } else if (x > xVal) {
+      high = idx - 1;
+    } else if (low != idx) {  // equal, but there may be an earlier match.
+      high = idx;
+    } else {
+      return idx;
+    }
+  }
+
+  return null;
+};
+
+/**
+ * Trigger a callback when the dygraph has drawn itself and is ready to be
+ * manipulated. This is primarily useful when dygraphs has to do an XHR for the
+ * data (i.e. a URL is passed as the data source) and the chart is drawn
+ * asynchronously. If the chart has already drawn, the callback will fire
+ * immediately.
+ *
+ * This is a good place to call setAnnotation().
+ *
+ * @param {function(!Dygraph)} callback The callback to trigger when the chart
+ *     is ready.
+ */
+Dygraph.prototype.ready = function(callback) {
+  if (this.is_initial_draw_) {
+    this.readyFns_.push(callback);
+  } else {
+    callback.call(this, this);
+  }
+};
+
+/**
+ * Add an event handler. This event handler is kept until the graph is
+ * destroyed with a call to graph.destroy().
+ *
+ * @param {!Node} elem The element to add the event to.
+ * @param {string} type The type of the event, e.g. 'click' or 'mousemove'.
+ * @param {function(Event):(boolean|undefined)} fn The function to call
+ *     on the event. The function takes one parameter: the event object.
+ * @private
+ */
+Dygraph.prototype.addAndTrackEvent = function(elem, type, fn) {
+  utils.addEvent(elem, type, fn);
+  this.registeredEvents_.push({elem, type, fn});
+};
+
+Dygraph.prototype.removeTrackedEvents_ = function() {
+  if (this.registeredEvents_) {
+    for (var idx = 0; idx < this.registeredEvents_.length; idx++) {
+      var reg = this.registeredEvents_[idx];
+      utils.removeEvent(reg.elem, reg.type, reg.fn);
+    }
+  }
+
+  this.registeredEvents_ = [];
+};
+
+
+// Installed plugins, in order of precedence (most-general to most-specific).
+Dygraph.PLUGINS = [
+  LegendPlugin,
+  AxesPlugin,
+  RangeSelectorPlugin, // Has to be before ChartLabels so that its callbacks are called after ChartLabels' callbacks.
+  ChartLabelsPlugin,
+  AnnotationsPlugin,
+  GridPlugin
+];
+
+// There are many symbols which have historically been available through the
+// Dygraph class. These are exported here for backwards compatibility.
+Dygraph.GVizChart = GVizChart;
+Dygraph.DASHED_LINE = utils.DASHED_LINE;
+Dygraph.DOT_DASH_LINE = utils.DOT_DASH_LINE;
+Dygraph.dateAxisLabelFormatter = utils.dateAxisLabelFormatter;
+Dygraph.toRGB_ = utils.toRGB_;
+Dygraph.findPos = utils.findPos;
+Dygraph.pageX = utils.pageX;
+Dygraph.pageY = utils.pageY;
+Dygraph.dateString_ = utils.dateString_;
+Dygraph.defaultInteractionModel = DygraphInteraction.defaultModel;
+Dygraph.nonInteractiveModel = Dygraph.nonInteractiveModel_ = DygraphInteraction.nonInteractiveModel_;
+Dygraph.Circles = utils.Circles;
+
+Dygraph.Plugins = {
+  Legend: LegendPlugin,
+  Axes: AxesPlugin,
+  Annotations: AnnotationsPlugin,
+  ChartLabels: ChartLabelsPlugin,
+  Grid: GridPlugin,
+  RangeSelector: RangeSelectorPlugin
+};
+
+Dygraph.DataHandlers = {
+  DefaultHandler,
+  BarsHandler,
+  CustomBarsHandler,
+  DefaultFractionHandler,
+  ErrorBarsHandler,
+  FractionsBarsHandler
+};
+
+Dygraph.startPan = DygraphInteraction.startPan;
+Dygraph.startZoom = DygraphInteraction.startZoom;
+Dygraph.movePan = DygraphInteraction.movePan;
+Dygraph.moveZoom = DygraphInteraction.moveZoom;
+Dygraph.endPan = DygraphInteraction.endPan;
+Dygraph.endZoom = DygraphInteraction.endZoom;
+
+Dygraph.numericLinearTicks = DygraphTickers.numericLinearTicks;
+Dygraph.numericTicks = DygraphTickers.numericTicks;
+Dygraph.dateTicker = DygraphTickers.dateTicker;
+Dygraph.Granularity = DygraphTickers.Granularity;
+Dygraph.getDateAxis = DygraphTickers.getDateAxis;
+Dygraph.floatFormat = utils.floatFormat;
+
+export default Dygraph;