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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const { extend } = require("devtools/shared/extend");
const {
AbstractCanvasGraph,
} = require("devtools/client/shared/widgets/Graphs");
// Bar graph constants.
const GRAPH_DAMPEN_VALUES_FACTOR = 0.9;
const GRAPH_BACKGROUND_COLOR = "#ddd";
const GRAPH_STROKE_WIDTH = 1; // px
const GRAPH_STROKE_COLOR = "rgba(255,255,255,0.9)";
const GRAPH_HELPER_LINES_DASH = [5]; // px
const GRAPH_HELPER_LINES_WIDTH = 1; // px
const GRAPH_CLIPHEAD_LINE_COLOR = "#fff";
const GRAPH_SELECTION_LINE_COLOR = "#fff";
const GRAPH_SELECTION_BACKGROUND_COLOR = "rgba(44,187,15,0.25)";
const GRAPH_SELECTION_STRIPES_COLOR = "rgba(255,255,255,0.1)";
const GRAPH_REGION_BACKGROUND_COLOR = "transparent";
const GRAPH_REGION_STRIPES_COLOR = "rgba(237,38,85,0.2)";
/**
* A mountain graph, plotting sets of values as line graphs.
*
* @see AbstractCanvasGraph for emitted events and other options.
*
* Example usage:
* let graph = new MountainGraphWidget(node);
* graph.format = ...;
* graph.once("ready", () => {
* graph.setData(src);
* });
*
* The `graph.format` traits are mandatory and will determine how each
* section of the moutain will be styled:
* [
* { color: "#f00", ... },
* { color: "#0f0", ... },
* ...
* { color: "#00f", ... }
* ]
*
* Data source format:
* [
* { delta: x1, values: [y11, y12, ... y1n] },
* { delta: x2, values: [y21, y22, ... y2n] },
* ...
* { delta: xm, values: [ym1, ym2, ... ymn] }
* ]
* where the [ymn] values is assumed to aready be normalized from [0..1].
*
* @param Node parent
* The parent node holding the graph.
*/
this.MountainGraphWidget = function(parent, ...args) {
AbstractCanvasGraph.apply(this, [parent, "mountain-graph", ...args]);
};
MountainGraphWidget.prototype = extend(AbstractCanvasGraph.prototype, {
backgroundColor: GRAPH_BACKGROUND_COLOR,
strokeColor: GRAPH_STROKE_COLOR,
strokeWidth: GRAPH_STROKE_WIDTH,
clipheadLineColor: GRAPH_CLIPHEAD_LINE_COLOR,
selectionLineColor: GRAPH_SELECTION_LINE_COLOR,
selectionBackgroundColor: GRAPH_SELECTION_BACKGROUND_COLOR,
selectionStripesColor: GRAPH_SELECTION_STRIPES_COLOR,
regionBackgroundColor: GRAPH_REGION_BACKGROUND_COLOR,
regionStripesColor: GRAPH_REGION_STRIPES_COLOR,
/**
* List of rules used to style each section of the mountain.
* @see constructor
* @type array
*/
format: null,
/**
* Optionally offsets the `delta` in the data source by this scalar.
*/
dataOffsetX: 0,
/**
* Optionally uses this value instead of the last tick in the data source
* to compute the horizontal scaling.
*/
dataDuration: 0,
/**
* The scalar used to multiply the graph values to leave some headroom
* on the top.
*/
dampenValuesFactor: GRAPH_DAMPEN_VALUES_FACTOR,
/**
* Renders the graph's background.
* @see AbstractCanvasGraph.prototype.buildBackgroundImage
*/
buildBackgroundImage: function() {
const { canvas, ctx } = this._getNamedCanvas("mountain-graph-background");
const width = this._width;
const height = this._height;
ctx.fillStyle = this.backgroundColor;
ctx.fillRect(0, 0, width, height);
return canvas;
},
/**
* Renders the graph's data source.
* @see AbstractCanvasGraph.prototype.buildGraphImage
*/
buildGraphImage: function() {
if (!this.format || !this.format.length) {
throw new Error(
"The graph format traits are mandatory to style " + "the data source."
);
}
const { canvas, ctx } = this._getNamedCanvas("mountain-graph-data");
const width = this._width;
const height = this._height;
const totalSections = this.format.length;
const totalTicks = this._data.length;
const firstTick = totalTicks ? this._data[0].delta : 0;
const lastTick = totalTicks ? this._data[totalTicks - 1].delta : 0;
const duration = this.dataDuration || lastTick;
const dataScaleX = (this.dataScaleX =
width / (duration - this.dataOffsetX));
const dataScaleY = (this.dataScaleY = height * this.dampenValuesFactor);
// Draw the graph.
const prevHeights = Array.from({ length: totalTicks }).fill(0);
ctx.globalCompositeOperation = "destination-over";
ctx.strokeStyle = this.strokeColor;
ctx.lineWidth = this.strokeWidth * this._pixelRatio;
for (let section = 0; section < totalSections; section++) {
ctx.fillStyle = this.format[section].color || "#000";
ctx.beginPath();
for (let tick = 0; tick < totalTicks; tick++) {
const { delta, values } = this._data[tick];
const currX = (delta - this.dataOffsetX) * dataScaleX;
const currY = values[section] * dataScaleY;
const prevY = prevHeights[tick];
if (delta == firstTick) {
ctx.moveTo(-GRAPH_STROKE_WIDTH, height);
ctx.lineTo(-GRAPH_STROKE_WIDTH, height - currY - prevY);
}
ctx.lineTo(currX, height - currY - prevY);
if (delta == lastTick) {
ctx.lineTo(width + GRAPH_STROKE_WIDTH, height - currY - prevY);
ctx.lineTo(width + GRAPH_STROKE_WIDTH, height);
}
prevHeights[tick] += currY;
}
ctx.fill();
ctx.stroke();
}
ctx.globalCompositeOperation = "source-over";
ctx.lineWidth = GRAPH_HELPER_LINES_WIDTH;
ctx.setLineDash(GRAPH_HELPER_LINES_DASH);
// Draw the maximum value horizontal line.
ctx.beginPath();
const maximumY = height * this.dampenValuesFactor;
ctx.moveTo(0, maximumY);
ctx.lineTo(width, maximumY);
ctx.stroke();
// Draw the average value horizontal line.
ctx.beginPath();
const averageY = (height / 2) * this.dampenValuesFactor;
ctx.moveTo(0, averageY);
ctx.lineTo(width, averageY);
ctx.stroke();
return canvas;
},
});
module.exports = MountainGraphWidget;
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