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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(width, height) {
this.width = width;
this.height = height;
}
// 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;
// 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";
// Returns an SVG element that needs to be inserted into the DOM for display
drawSparseValues = (dataSet, title, config) => {
const { width, height } = this;
// Clear the canvas
const bgColor = this.bgColor();
const mkSvgElem = type =>
document.createElementNS("http://www.w3.org/2000/svg", type);
const svgText = (x, y, text, color, subclass) => {
const txt = mkSvgElem("text");
txt.setAttribute("x", x);
txt.setAttribute("y", y);
txt.setAttribute("stroke", bgColor);
txt.setAttribute("fill", color);
txt.setAttribute("paint-order", "stroke");
txt.textContent = text;
txt.classList.add(["graph-text", ...[subclass]].join("-"));
return txt;
};
const svg = mkSvgElem("svg");
svg.setAttribute("viewBox", `0 0 ${width} ${height}`);
svg.setAttribute("version", "1.1");
svg.setAttribute("width", width);
svg.setAttribute("height", height);
svg.classList.add("svg-graph");
const rect = mkSvgElem("rect");
rect.setAttribute("fill", bgColor);
rect.setAttribute("width", width);
rect.setAttribute("height", height);
svg.appendChild(rect);
if (config.toRate) {
dataSet = dataSet.toRateDataSet();
}
const startTime = this.startTime(dataSet);
const stopTime = this.stopTime(dataSet);
let timeFilter = ({ time }) => time >= startTime && time <= stopTime;
let avgDataSet = { dataPoints: [] };
if (!config.noAvg) {
avgDataSet = dataSet.toRollingAverageDataSet(config.avgPoints);
}
let filtered = dataSet.filter(timeFilter);
if (filtered.dataPoints == []) {
return svg;
}
let range = filtered.dataRange();
if (range === undefined) {
return svg;
}
let { min: rangeMin, max: rangeMax } = range;
// Adjust the _display_ range to lift flat lines towards the center
if (rangeMin == rangeMax) {
rangeMin = rangeMin - 1;
rangeMax = rangeMax + 1;
}
const yFactor = (height - 26) / (1 + rangeMax - rangeMin);
const yPos = ({ value }) =>
this.height - 1 - (value - rangeMin) * yFactor - 13;
const xFactor = width / (1 + stopTime - startTime);
const xPos = ({ time }) => (time - startTime) * xFactor;
const toPathStr = dataPoints =>
[...dataPoints]
.map(
(datum, index) => `${index ? "L" : "M"}${xPos(datum)} ${yPos(datum)}`
)
.join(" ");
const valuePath = mkSvgElem("path");
valuePath.setAttribute("d", toPathStr(filtered.dataPoints));
valuePath.setAttribute("stroke", this.valueLineColor());
valuePath.setAttribute("fill", "none");
svg.appendChild(valuePath);
const avgPath = mkSvgElem("path");
avgPath.setAttribute("d", toPathStr(avgDataSet.dataPoints));
avgPath.setAttribute("stroke", this.averageLineColor());
avgPath.setAttribute("fill", "none");
svg.appendChild(avgPath);
const fixed = num => num.toFixed(config.fixedPointDecimals);
const formatValue = value =>
config.toHuman
? toHumanReadable(value, config.fixedPointDecimals).join("")
: fixed(value);
// Draw rolling average text
avgDataSet.dataPoints.slice(-1).forEach(({ value }) => {
svg.appendChild(
svgText(
5,
height - 4,
`AVG: ${formatValue(value)}`,
this.averageLineColor(),
"avg"
)
);
});
// Draw title text
if (title) {
svg.appendChild(
svgText(
5,
12,
`${title}${config.toRate ? "/s" : ""}`,
this.titleColor(this),
"title"
)
);
}
// Draw max value text
const maxText = svgText(
width - 5,
12,
`Max: ${formatValue(range.max)}`,
this.maxColor(range.max),
"max"
);
maxText.setAttribute("text-anchor", "end");
svg.appendChild(maxText);
// Draw min value text
const minText = svgText(
width - 5,
height - 4,
`Min: ${formatValue(range.min)}`,
this.minColor(range.min),
"min"
);
minText.setAttribute("text-anchor", "end");
svg.appendChild(minText);
return svg;
};
}
export { GraphImpl };
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