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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/. */
function compStyle(property) {
return getComputedStyle(window.document.body).getPropertyValue(property);
}
function toHumanReadable(num, fpDecimals) {
const prefixes = [..." kMGTPEYZYRQ"];
const inner = (curr, remainingPrefixes) => {
return Math.abs(curr >= 1000)
? inner(curr / 1000, remainingPrefixes.slice(1, -1))
: [curr.toFixed(fpDecimals), remainingPrefixes[0].trimEnd()];
};
return inner(num, prefixes);
}
class GraphImpl {
constructor(canvas, width, height) {
this.canvas = canvas;
this.width = width;
this.height = height;
this.drawCtx = canvas.getContext("2d");
}
// The returns the earliest time to graph
startTime = dataSet => (dataSet.earliest() || { time: 0 }).time;
// Returns the latest time to graph
stopTime = dataSet => (dataSet.latest() || { time: 0 }).time;
/** @type {HTMLCanvasElement} */
canvas = {};
/** @type {CanvasRenderingContext2D} */
drawCtx = {};
// The default background color
bgColor = () => compStyle("--in-content-page-background");
// The color to use for value graph lines
valueLineColor = () => "grey";
// The color to use for average graph lines and text
averageLineColor = () => "green";
// The color to use for the max value
maxColor = ({ time, value }) => "grey";
// The color to use for the min value
minColor = ({ time, value }) => "grey";
// Title color
titleColor = title => compStyle("--in-content-page-color");
// The color to use for a data point at a time.
// The destination x coordinate and graph width are also provided.
datumColor = ({ time, value, x, width }) => "red";
drawSparseValues = (dataSet, title, config) => {
if (config.toRate) {
dataSet = dataSet.toRateDataSet();
}
const { drawCtx: ctx, width, height } = this;
// Clear the canvas
const bgColor = this.bgColor();
ctx.fillStyle = bgColor;
ctx.clearRect(0, 0, width, height);
ctx.fillRect(0, 0, width, height);
const startTime = this.startTime(dataSet);
const stopTime = this.stopTime(dataSet);
let timeFilter = ({ time }) => time >= startTime && time <= stopTime;
let avgDataSet = { dataPoints: [] };
if (!config.noAvg) {
avgDataSet = dataSet.toRollingAverageDataSet(config.avgPoints);
}
let filtered = dataSet.filter(timeFilter);
if (filtered.dataPoints == []) {
return;
}
let range = filtered.dataRange();
if (range === undefined) {
return;
}
let { min: rangeMin, max: rangeMax } = range;
// Adjust the _display_ range to lift flat lines towards the center
if (rangeMin == rangeMax) {
rangeMin = rangeMin - 1;
rangeMax = rangeMax + 1;
}
const yFactor = (height - 26) / (1 + rangeMax - rangeMin);
const yPos = ({ value }) =>
this.height - 1 - (value - rangeMin) * yFactor - 13;
const xFactor = width / (1 + stopTime - startTime);
const xPos = ({ time }) => (time - startTime) * xFactor;
ctx.lineWidth = 1;
ctx.beginPath();
ctx.strokeStyle = this.valueLineColor();
[...filtered.dataPoints].forEach((datum, index) => {
if (!index) {
ctx.moveTo(xPos(datum), yPos(datum));
} else {
ctx.lineTo(xPos(datum), yPos(datum));
}
// Draw data point
ctx.fillStyle = this.datumColor({ ...datum, width: this.width });
ctx.fillRect(xPos(datum), yPos(datum), 1, 1);
});
ctx.stroke();
// Rolling average
ctx.lineWidth = 2;
ctx.strokeStyle = this.averageLineColor();
ctx.beginPath();
const rollingAverage = avgDataSet.dataPoints;
[...rollingAverage].forEach((datum, index) => {
if (!index) {
ctx.moveTo(xPos(datum), yPos(datum));
} else {
ctx.lineTo(xPos(datum), yPos(datum));
}
});
const fixed = num => num.toFixed(config.fixedPointDecimals);
const formatValue = value =>
config.toHuman
? toHumanReadable(value, config.fixedPointDecimals).join("")
: fixed(value);
rollingAverage.slice(-1).forEach(({ value }) => {
ctx.stroke();
ctx.fillStyle = this.averageLineColor();
ctx.font = "12px Arial";
ctx.textAlign = "left";
ctx.fillText(formatValue(value), 5, this.height - 4);
});
// Draw the title
if (title) {
ctx.fillStyle = this.titleColor(this);
ctx.font = "12px Arial";
ctx.textAlign = "left";
ctx.fillText(`${title}${config.toRate ? "/s" : ""}`, 5, 12);
}
ctx.font = "12px Arial";
ctx.fillStyle = this.maxColor(range.max);
ctx.textAlign = "right";
ctx.fillText(formatValue(range.max), this.width - 5, 12);
ctx.fillStyle = this.minColor(range.min);
ctx.fillText(formatValue(range.min), this.width - 5, this.height - 4);
};
}
export { GraphImpl };
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