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Diffstat (limited to 'debian/missing-sources/epoch/src/time.coffee')
| -rw-r--r-- | debian/missing-sources/epoch/src/time.coffee | 615 |
1 files changed, 615 insertions, 0 deletions
diff --git a/debian/missing-sources/epoch/src/time.coffee b/debian/missing-sources/epoch/src/time.coffee new file mode 100644 index 0000000..402cc50 --- /dev/null +++ b/debian/missing-sources/epoch/src/time.coffee @@ -0,0 +1,615 @@ +# Real-time Plot Base Class. Uses an html5 canvas to recreate the basic d3 drawing routines +# while simultaneously reducing the load on the viewer's cpu (and, you know, not leaking +# memory which ultimately leads to a crashed browser). +# +# The class also handles the creation of axes and margins common to all time-series plots. +# Furthermore it layers the canvas below an SVG element to keep visual consistency when +# rendering text, glyphs, etc. +class Epoch.Time.Plot extends Epoch.Chart.Canvas + defaults = + range: null + fps: 24 + historySize: 120 + windowSize: 40 + queueSize: 10 + axes: ['bottom'] + ticks: + time: 15 + left: 5 + right: 5 + tickFormats: + top: Epoch.Formats.seconds + bottom: Epoch.Formats.seconds + left: Epoch.Formats.si + right: Epoch.Formats.si + + defaultAxisMargins = + top: 25 + right: 50 + bottom: 25 + left: 50 + + optionListeners = + 'option:margins': 'marginsChanged' + 'option:margins.top': 'marginsChanged' + 'option:margins.right': 'marginsChanged' + 'option:margins.bottom': 'marginsChanged' + 'option:margins.left': 'marginsChanged' + 'option:axes': 'axesChanged' + 'option:ticks': 'ticksChanged' + 'option:ticks.top': 'ticksChanged' + 'option:ticks.right': 'ticksChanged' + 'option:ticks.bottom': 'ticksChanged' + 'option:ticks.left': 'ticksChanged' + 'option:tickFormats': 'tickFormatsChanged' + 'option:tickFormats.top': 'tickFormatsChanged' + 'option:tickFormats.right': 'tickFormatsChanged' + 'option:tickFormats.bottom': 'tickFormatsChanged' + 'option:tickFormats.left': 'tickFormatsChanged' + + # Creates a new real-time plot. + # + # @param [Object] options Options for the plot. + # @option options [Integer] fps Number of frames per second to use when animating + # the plot. + # @option options [Integer] historySize Maximum number of elements to keep in history + # for the plot. + # @option options [Integer] windowSize Number of entries to simultaneously display + # when rendering the visualization. + # @option options [Integer] queueSize Number of elements to queue while not animating + # but still recieving elements. In some browsers, intervals will not fire if the + # page containing them is not the active tab. By setting a maximum limit to the + # number of unprocessed data points we can ensure that the memory footprint of the + # page does not get out of hand. + # @option options [Object] margins Explicit margins to use for the visualization. Note + # that these are optional and will be automatically generated based on which axes are + # used for the visualization. Margins are keyed by their position (top, left, bottom + # and/or right) and should map to [Integer] values. + # @option options [Array] axes Which axes to display when rendering the visualization + # (top, left, bottom, and/or right). + # @option options [Object] ticks Number of ticks to display on each axis available axes + # ares: time, left, and right. The number provided for the left and right axes are in + # absolute terms (i.e. there will be exactly that number of ticks). The time ticks + # denote how often a tick should be generated (e.g. if 5 is provided then a tick will + # be added every fifth time you push a new data entry into the visualization). + # @option options [Object] tickFormats Formatting functions for ticks on the given axes. + # The avaiable axes are: top, bottom, left, and right. + constructor: (@options) -> + givenMargins = Epoch.Util.copy(@options.margins) or {} + super(@options = Epoch.Util.defaults(@options, defaults)) + + if @options.model + @options.model.on 'data:push', => @pushFromModel() + + # Queue entering data to get around memory bloat and "non-active" tab issues + @_queue = [] + + # Margins + @margins = {} + for pos in ['top', 'right', 'bottom', 'left'] + @margins[pos] = if @options.margins? and @options.margins[pos]? + @options.margins[pos] + else if @hasAxis(pos) + defaultAxisMargins[pos] + else + 6 + + # SVG Overlay + @svg = @el.insert('svg', ':first-child') + .attr('width', @width) + .attr('height', @height) + .style('z-index', '1000') + + # Position the canvas "under" the SVG element + if @el.style('position') != 'absolute' and @el.style('position') != 'relative' + @el.style('position', 'relative') + + @canvas.style { position: 'absolute', 'z-index': '999' } + @_sizeCanvas() + + # Animation / Transitions + @animation = + interval: null + active: false + delta: => -(@w() / @options.fps), + tickDelta: => -( (@w() / @pixelRatio) / @options.fps ) + frame: 0, + duration: @options.fps + + # Add SVG Axes + @_buildAxes() + + # Callback used for animation + @animationCallback = => @_animate() + + # Listen for specific option changes + @onAll optionListeners + + # Positions and sizes the canvas based on margins and axes. + _sizeCanvas: -> + @canvas.attr + width: @innerWidth() + height: @innerHeight() + + @canvas.style + width: "#{@innerWidth() / @pixelRatio}px" + height: "#{@innerHeight() / @pixelRatio}px" + top: "#{@margins.top}px" + left: "#{@margins.left}px" + + # Removes any axes found in the SVG and adds both the time and range axes to the plot. + _buildAxes: -> + @svg.selectAll('.axis').remove() + @_prepareTimeAxes() + @_prepareRangeAxes() + + # Works exactly as in Epoch.Chart.Base with the addition of truncating value arrays + # to that of the historySize defined in the chart's options. + _annotateLayers: (prepared) -> + data = [] + for own i, layer of prepared + copy = Epoch.Util.copy(layer) + start = Math.max(0, layer.values.length - @options.historySize) + copy.values = layer.values.slice(start) + classes = ['layer'] + classes.push "category#{(i|0)+1}" + classes.push(Epoch.Util.dasherize layer.label) if layer.label? + copy.className = classes.join(' ') + copy.visible = true + data.push copy + return data + + # This method is called to provide a small offset for placement of horizontal ticks. + # The value returned will be added to the x value of each tick as they are being + # rendered. + # + # @return [Number] The horizontal offset for the top and bottom axes ticks. + _offsetX: -> 0 + + # Builds time axes (bottom and top) + _prepareTimeAxes: -> + if @hasAxis('bottom') + axis = @bottomAxis = @svg.append('g') + .attr('class', "x axis bottom canvas") + .attr('transform', "translate(#{@margins.left-1}, #{@innerHeight()/@pixelRatio+@margins.top})") + axis.append('path') + .attr('class', 'domain') + .attr('d', "M0,0H#{@innerWidth()/@pixelRatio+1}") + + if @hasAxis('top') + axis = @topAxis = @svg.append('g') + .attr('class', "x axis top canvas") + .attr('transform', "translate(#{@margins.left-1}, #{@margins.top})") + axis.append('path') + .attr('class', 'domain') + .attr('d', "M0,0H#{@innerWidth()/@pixelRatio+1}") + + @_resetInitialTimeTicks() + + # Resets the initial ticks for the time axes. + _resetInitialTimeTicks: -> + tickInterval = @options.ticks.time + @_ticks = [] + @_tickTimer = tickInterval + + @bottomAxis.selectAll('.tick').remove() if @bottomAxis? + @topAxis.selectAll('.tick').remove() if @topAxis? + + for layer in @data + continue unless Epoch.isNonEmptyArray(layer.values) + [i, k] = [@options.windowSize-1, layer.values.length-1] + while i >= 0 and k >= 0 + @_pushTick i, layer.values[k].time, false, true + i -= tickInterval + k -= tickInterval + break + + # Builds the range axes (left and right) + _prepareRangeAxes: -> + if @hasAxis('left') + @svg.append("g") + .attr("class", "y axis left") + .attr('transform', "translate(#{@margins.left-1}, #{@margins.top})") + .call(@leftAxis()) + + if @hasAxis('right') + @svg.append('g') + .attr('class', 'y axis right') + .attr('transform', "translate(#{@width - @margins.right}, #{@margins.top})") + .call(@rightAxis()) + + # @return [Object] The d3 left axis. + leftAxis: -> + ticks = @options.ticks.left + axis = d3.svg.axis().scale(@ySvgLeft()).orient('left') + .tickFormat(@options.tickFormats.left) + if ticks == 2 + axis.tickValues @extent((d) -> d.y) + else + axis.ticks(ticks) + + # @return [Object] The d3 right axis. + rightAxis: -> + extent = @extent((d) -> d.y) + ticks = @options.ticks.right + axis = d3.svg.axis().scale(@ySvgRight()).orient('right') + .tickFormat(@options.tickFormats.right) + if ticks == 2 + axis.tickValues @extent((d) -> d.y) + else + axis.ticks(ticks) + + # Determines if the visualization is displaying the axis with the given name. + # @param [String] name Name of the axis + # @return [Boolean] <code>true</code> if the axis was set in the options, <code>false</code> otherwise. + hasAxis: (name) -> + @options.axes.indexOf(name) > -1 + + # @return [Number] the width of the visualization area of the plot (full width - margins) + innerWidth: -> + (@width - (@margins.left + @margins.right)) * @pixelRatio + + # @return [Number] the height of the visualization area of the plot (full height - margins) + innerHeight: -> + (@height - (@margins.top + @margins.bottom)) * @pixelRatio + + # Abstract method for performing any preprocessing before queuing new entries + # @param entry [Object] The entry to prepare. + # @return [Object] The prepared entry. + _prepareEntry: (entry) -> entry + + # Abstract method for preparing a group of layered entries entering the visualization + # @param [Array] layers The layered entries to prepare. + # @return [Array] The prepared layers. + _prepareLayers: (layers) -> layers + + # This method will remove the first incoming entry from the visualization's queue + # and shift it into the working set (aka window). It then starts the animating the + # transition of the element into the visualization. + # @event transition:start in the case that animation is actually started. + _startTransition: -> + return if @animation.active == true or @_queue.length == 0 + @trigger 'transition:start' + @_shift() + @animation.active = true + @animation.interval = setInterval(@animationCallback, 1000/@options.fps) + + # Stops animating and clears the animation interval given there is no more + # incoming data to process. Also finalizes tick entering and exiting. + # @event transition:end After the transition has completed. + _stopTransition: -> + return unless @inTransition() + + # Shift data off the end + for layer in @data + continue unless layer.values.length > @options.windowSize + 1 + layer.values.shift() + + # Finalize tick transitions + [firstTick, lastTick] = [@_ticks[0], @_ticks[@_ticks.length-1]] + + if lastTick? and lastTick.enter + lastTick.enter = false + lastTick.opacity = 1 + + if firstTick? and firstTick.exit + @_shiftTick() + + # Reset the animation frame modulus + @animation.frame = 0 + + # Trigger that we are done transitioning + @trigger 'transition:end' + + # Clear the transition interval unless another entry is already queued + if @_queue.length > 0 + @_shift() + else + @animation.active = false + clearInterval @animation.interval + + # Determines if the plot is currently animating a transition. + # @return [Boolean] <code>true</code> if the plot is animating, <code>false</code> otherwise. + inTransition: -> + @animation.active + + # This method is used by the application programmer to introduce new data into + # the timeseries plot. The method queues the incoming data, ensures a fixed size + # for the data queue, and finally calls <code>_startTransition</code> method to + # begin animating the plot. + # @param [Array] layers Layered incoming visualization data. + # @event push Triggered after the new data has been pushed into the queue. + push: (layers) -> + layers = @_prepareLayers(layers) + + # Handle entry queue maximum size + if @_queue.length > @options.queueSize + @_queue.splice @options.queueSize, (@_queue.length - @options.queueSize) + return false if @_queue.length == @options.queueSize + + # Push the entry into the queue + @_queue.push layers.map((entry) => @_prepareEntry(entry)) + + @trigger 'push' + + # Begin the transition unless we are already doing so + @_startTransition() unless @inTransition() + + # Fetches new entry data from the model in response to a 'data:push' event. + pushFromModel: -> + @push @options.model.getNext(@options.type, @options.dataFormat) + + # Shift elements off the incoming data queue (see the implementation of + # push above). + # + # If there's data to be shoved into the visualization it will pull it + # off the queue and put it into the working dataset. It also calls through + # to @_updateTicks to handle horizontal (or "time") axes tick transitions + # since we're implementing independent of d3 as well. + # + # @event before:shift Before an element has been shifted off the queue. + # @event after:shift After the element has been shifted off the queue. + _shift: -> + @trigger 'before:shift' + entry = @_queue.shift() + layer.values.push(entry[i]) for own i, layer of @data + @_updateTicks(entry[0].time) + @_transitionRangeAxes() + @trigger 'after:shift' + + # Transitions the left and right axes when the range of the plot has changed. + _transitionRangeAxes: -> + if @hasAxis('left') + @svg.selectAll('.y.axis.left').transition() + .duration(500) + .ease('linear') + .call(@leftAxis()) + + if @hasAxis('right') + @svg.selectAll('.y.axis.right').transition() + .duration(500) + .ease('linear') + .call(@rightAxis()) + + # Performs the animation for transitioning elements in the visualization. + _animate: -> + return unless @inTransition() + @_stopTransition() if ++@animation.frame == @animation.duration + @draw(@animation.frame * @animation.delta()) + @_updateTimeAxes() + + # @param [Array] givenDomain A given domain for the scale + # @return [Function] The y scale for the plot + y: (givenDomain) -> + d3.scale.linear() + .domain(@_getScaleDomain(givenDomain)) + .range([@innerHeight(), 0]) + + # @param [Array] givenDomain Optional domain to override default + # @return [Function] The y scale for the svg portions of the plot + ySvg: (givenDomain) -> + d3.scale.linear() + .domain(@_getScaleDomain(givenDomain)) + .range([@innerHeight() / @pixelRatio, 0]) + + # @return [Function] The y scale for the svg portion of the plot for the left axis + ySvgLeft: -> + if @options.range? + @ySvg @options.range.left + else + @ySvg() + + # @return [Function] The y scale for the svg portion of the plot for the right axis + ySvgRight: -> + if @options.range? + @ySvg @options.range.right + else + @ySvg() + + # @return [Number] The width of a single section of the graph pertaining to a data point + w: -> + @innerWidth() / @options.windowSize + + # This is called every time we introduce new data (as a result of _shift) + # it checks to see if we also need to update the working tick set and + # makes the approriate changes for handling tick animation (enter, exit, + # and update in the d3 model). + # + # @param [Integer] newTime Current newest timestamp in the data + _updateTicks: (newTime) -> + return unless @hasAxis('top') or @hasAxis('bottom') + + # Incoming ticks + unless (++@_tickTimer) % @options.ticks.time + @_pushTick(@options.windowSize, newTime, true) + + # Outgoing ticks + return unless @_ticks.length > 0 + unless @_ticks[0].x - (@w()/@pixelRatio) >= 0 + @_ticks[0].exit = true + + # Makes and pushes a new tick into the visualization. + # + # @param bucket Index in the data window where the tick should initially be position + # @param time The unix timestamp associated with the tick + # @param enter Whether or not the tick should be considered as "newly entering" + # Used primarily for performing the tick opacity tween. + _pushTick: (bucket, time, enter=false, reverse=false) -> + return unless @hasAxis('top') or @hasAxis('bottom') + tick = + time: time + x: bucket*(@w()/@pixelRatio) + @_offsetX() + opacity: if enter then 0 else 1 + enter: if enter then true else false + exit: false + + if @hasAxis('bottom') + g = @bottomAxis.append('g') + .attr('class', 'tick major') + .attr('transform', "translate(#{tick.x+1},0)") + .style('opacity', tick.opacity) + + g.append('line') + .attr('y2', 6) + + g.append('text') + .attr('text-anchor', 'middle') + .attr('dy', 19) + .text(@options.tickFormats.bottom(tick.time)) + + tick.bottomEl = g + + if @hasAxis('top') + g = @topAxis.append('g') + .attr('class', 'tick major') + .attr('transform', "translate(#{tick.x+1},0)") + .style('opacity', tick.opacity) + + g.append('line') + .attr('y2', -6) + + g.append('text') + .attr('text-anchor', 'middle') + .attr('dy', -10) + .text(@options.tickFormats.top(tick.time)) + + tick.topEl = g + + if reverse + @_ticks.unshift tick + else + @_ticks.push tick + return tick + + # Shifts a tick that is no longer needed out of the visualization. + _shiftTick: -> + return unless @_ticks.length > 0 + tick = @_ticks.shift() + tick.topEl.remove() if tick.topEl? + tick.bottomEl.remove() if tick.bottomEl? + + # This performs animations for the time axes (top and bottom). + _updateTimeAxes: -> + return unless @hasAxis('top') or @hasAxis('bottom') + [dx, dop] = [@animation.tickDelta(), 1 / @options.fps] + + for tick in @_ticks + tick.x += dx + if @hasAxis('bottom') + tick.bottomEl.attr('transform', "translate(#{tick.x+1},0)") + if @hasAxis('top') + tick.topEl.attr('transform', "translate(#{tick.x+1},0)") + + if tick.enter + tick.opacity += dop + else if tick.exit + tick.opacity -= dop + + if tick.enter or tick.exit + tick.bottomEl.style('opacity', tick.opacity) if @hasAxis('bottom') + tick.topEl.style('opacity', tick.opacity) if @hasAxis('top') + + # Draws the visualization in the plot's canvas. + # @param delta The current x offset to apply to all elements when rendering. This number + # will be 0 when the plot is not animating and negative when it is. + # @abstract It does nothing on its own but is provided so that subclasses can + # define a custom rendering routine. + draw: (delta=0) -> super() + + dimensionsChanged: -> + super() + @svg.attr('width', @width).attr('height', @height) + @_sizeCanvas() + @_buildAxes() + @draw(@animation.frame * @animation.delta()) + + # Updates axes in response to an <code>option:axes</code> event. + axesChanged: -> + for pos in ['top', 'right', 'bottom', 'left'] + continue if @options.margins? and @options.margins[pos]? + if @hasAxis(pos) + @margins[pos] = defaultAxisMargins[pos] + else + @margins[pos] = 6 + @_sizeCanvas() + @_buildAxes() + @draw(@animation.frame * @animation.delta()) + + # Updates ticks in response to an <code>option.ticks.*</code> event. + ticksChanged: -> + @_resetInitialTimeTicks() + @_transitionRangeAxes() + @draw(@animation.frame * @animation.delta()) + + # Updates tick formats in response to an <code>option.tickFormats.*</code> event. + tickFormatsChanged: -> + @_resetInitialTimeTicks() + @_transitionRangeAxes() + @draw(@animation.frame * @animation.delta()) + + # Updates margins in response to an <code>option.margins.*</code> event. + marginsChanged: -> + return unless @options.margins? + for own pos, size of @options.margins + unless size? + @margins[pos] = 6 + else + @margins[pos] = size + + @_sizeCanvas() + @draw(@animation.frame * @animation.delta()) + + layerChanged: -> + @_transitionRangeAxes() + super() + + +# Base class for all "stacked" plot types (e.g. bar charts, area charts, etc.) +# @abstract It does not perform rendering but instead formats the data +# so as to ease the process of rendering stacked plots. +class Epoch.Time.Stack extends Epoch.Time.Plot + # Sets stacking information (y0) for each of the points in each layer + _stackLayers: -> + return unless (layers = @getVisibleLayers()).length > 0 + for i in [0...layers[0].values.length] + y0 = 0 + for layer in layers + layer.values[i].y0 = y0 + y0 += layer.values[i].y + + # Adds stacking information for layers entering the visualization. + # @param [Array] layers Layers to stack. + _prepareLayers: (layers) -> + y0 = 0 + for own i, d of layers + continue unless @data[i].visible + d.y0 = y0 + y0 += d.y + return layers + + # Ensures that elements are stacked when setting the initial data. + # @param [Array] data Layered data to set for the visualization. + setData: (data) -> + super(data) + @_stackLayers() + + # Finds the correct extent to use for range axes (left and right). + # @return [Array] An extent array with the first element equal to 0 + # and the second element equal to the maximum value amongst the + # stacked entries. + extent: -> + [max, layers] = [0, @getVisibleLayers()] + return [0, 0] unless layers.length + + for i in [0...layers[0].values.length] + sum = 0 + for j in [0...layers.length] + sum += layers[j].values[i].y + max = sum if sum > max + + [0, max] + + layerChanged: -> + @_stackLayers() + @_prepareLayers(layers) for layers in @_queue + super() |