369 lines
11 KiB
JavaScript
369 lines
11 KiB
JavaScript
function _1(md){return(
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md`# Color Legend
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A simple legend for a [color scale](/@d3/color-schemes). Supports [continuous](/@d3/continuous-scales), [sequential](/@d3/sequential-scales), [diverging](/@d3/diverging-scales), [quantize, quantile, threshold](/@d3/quantile-quantize-and-threshold-scales) and [ordinal](/@d3/d3-scaleordinal) scales. To use:
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~~~js
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import {Legend, Swatches} from "@d3/color-legend"
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~~~
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Then call the legend function as shown below. (For ordinal scales, also consider the swatches function.)`
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)}
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function _2(Legend,d3){return(
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Legend(d3.scaleSequential([0, 100], d3.interpolateViridis), {
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title: "Temperature (°F)"
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})
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)}
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function _3(Legend,d3){return(
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Legend(d3.scaleSequentialSqrt([0, 1], d3.interpolateTurbo), {
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title: "Speed (kts)"
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})
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)}
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function _4(Legend,d3){return(
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Legend(d3.scaleDiverging([-0.1, 0, 0.1], d3.interpolatePiYG), {
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title: "Daily change",
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tickFormat: "+%"
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})
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)}
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function _5(Legend,d3){return(
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Legend(d3.scaleDivergingSqrt([-0.1, 0, 0.1], d3.interpolateRdBu), {
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title: "Daily change",
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tickFormat: "+%"
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})
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)}
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function _6(Legend,d3){return(
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Legend(d3.scaleSequentialLog([1, 100], d3.interpolateBlues), {
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title: "Energy (joules)",
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ticks: 10
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})
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)}
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function _7(Legend,d3){return(
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Legend(d3.scaleSequentialQuantile(d3.range(100).map(() => Math.random() ** 2), d3.interpolateBlues), {
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title: "Quantile",
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tickFormat: ".2f"
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})
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)}
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function _8(Legend,d3){return(
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Legend(d3.scaleSqrt([-100, 0, 100], ["blue", "white", "red"]), {
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title: "Temperature (°C)"
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})
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)}
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function _9(Legend,d3){return(
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Legend(d3.scaleQuantize([1, 10], d3.schemePurples[9]), {
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title: "Unemployment rate (%)"
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})
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)}
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function _10(Legend,d3){return(
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Legend(d3.scaleQuantile(d3.range(1000).map(d3.randomNormal(100, 20)), d3.schemeSpectral[9]), {
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title: "Height (cm)",
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tickFormat: ".0f"
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})
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)}
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function _11(Legend,d3){return(
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Legend(d3.scaleThreshold([2.5, 3.1, 3.5, 3.9, 6, 7, 8, 9.5], d3.schemeRdBu[9]), {
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title: "Unemployment rate (%)",
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tickSize: 0
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})
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)}
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function _12(Legend,d3){return(
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Legend(d3.scaleOrdinal(["<10", "10-19", "20-29", "30-39", "40-49", "50-59", "60-69", "70-79", "≥80"], d3.schemeSpectral[10]), {
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title: "Age (years)",
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tickSize: 0
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})
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)}
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function _13(md){return(
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md`But wait, there’s more!
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How about swatches for ordinal color scales? Both variable-width swatches and [column layout](https://developer.mozilla.org/en-US/docs/Web/CSS/columns) are supported.`
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)}
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function _14(Swatches,d3){return(
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Swatches(d3.scaleOrdinal(["blueberries", "oranges", "apples"], d3.schemeCategory10))
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)}
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function _15(Swatches,d3){return(
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Swatches(d3.scaleOrdinal(["Wholesale and Retail Trade", "Manufacturing", "Leisure and hospitality", "Business services", "Construction", "Education and Health", "Government", "Finance", "Self-employed", "Other"], d3.schemeTableau10), {
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columns: "180px"
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})
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)}
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function _16(md){return(
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md`---
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## Implementation`
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)}
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function _Legend(d3){return(
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function Legend(color, {
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title,
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tickSize = 6,
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width = 320,
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height = 44 + tickSize,
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marginTop = 18,
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marginRight = 0,
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marginBottom = 16 + tickSize,
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marginLeft = 0,
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ticks = width / 64,
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tickFormat,
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tickValues
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} = {}) {
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function ramp(color, n = 256) {
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const canvas = document.createElement("canvas");
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canvas.width = n;
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canvas.height = 1;
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const context = canvas.getContext("2d");
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for (let i = 0; i < n; ++i) {
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context.fillStyle = color(i / (n - 1));
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context.fillRect(i, 0, 1, 1);
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}
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return canvas;
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}
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const svg = d3.create("svg")
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.attr("width", width)
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.attr("height", height)
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.attr("viewBox", [0, 0, width, height])
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.style("overflow", "visible")
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.style("display", "block");
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let tickAdjust = g => g.selectAll(".tick line").attr("y1", marginTop + marginBottom - height);
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let x;
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// Continuous
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if (color.interpolate) {
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const n = Math.min(color.domain().length, color.range().length);
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x = color.copy().rangeRound(d3.quantize(d3.interpolate(marginLeft, width - marginRight), n));
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svg.append("image")
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.attr("x", marginLeft)
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.attr("y", marginTop)
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.attr("width", width - marginLeft - marginRight)
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.attr("height", height - marginTop - marginBottom)
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.attr("preserveAspectRatio", "none")
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.attr("xlink:href", ramp(color.copy().domain(d3.quantize(d3.interpolate(0, 1), n))).toDataURL());
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}
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// Sequential
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else if (color.interpolator) {
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x = Object.assign(color.copy()
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.interpolator(d3.interpolateRound(marginLeft, width - marginRight)),
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{range() { return [marginLeft, width - marginRight]; }});
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svg.append("image")
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.attr("x", marginLeft)
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.attr("y", marginTop)
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.attr("width", width - marginLeft - marginRight)
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.attr("height", height - marginTop - marginBottom)
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.attr("preserveAspectRatio", "none")
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.attr("xlink:href", ramp(color.interpolator()).toDataURL());
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// scaleSequentialQuantile doesn’t implement ticks or tickFormat.
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if (!x.ticks) {
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if (tickValues === undefined) {
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const n = Math.round(ticks + 1);
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tickValues = d3.range(n).map(i => d3.quantile(color.domain(), i / (n - 1)));
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}
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if (typeof tickFormat !== "function") {
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tickFormat = d3.format(tickFormat === undefined ? ",f" : tickFormat);
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}
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}
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}
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// Threshold
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else if (color.invertExtent) {
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const thresholds
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= color.thresholds ? color.thresholds() // scaleQuantize
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: color.quantiles ? color.quantiles() // scaleQuantile
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: color.domain(); // scaleThreshold
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const thresholdFormat
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= tickFormat === undefined ? d => d
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: typeof tickFormat === "string" ? d3.format(tickFormat)
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: tickFormat;
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x = d3.scaleLinear()
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.domain([-1, color.range().length - 1])
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.rangeRound([marginLeft, width - marginRight]);
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svg.append("g")
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.selectAll("rect")
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.data(color.range())
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.join("rect")
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.attr("x", (d, i) => x(i - 1))
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.attr("y", marginTop)
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.attr("width", (d, i) => x(i) - x(i - 1))
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.attr("height", height - marginTop - marginBottom)
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.attr("fill", d => d);
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tickValues = d3.range(thresholds.length);
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tickFormat = i => thresholdFormat(thresholds[i], i);
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}
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// Ordinal
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else {
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x = d3.scaleBand()
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.domain(color.domain())
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.rangeRound([marginLeft, width - marginRight]);
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svg.append("g")
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.selectAll("rect")
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.data(color.domain())
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.join("rect")
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.attr("x", x)
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.attr("y", marginTop)
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.attr("width", Math.max(0, x.bandwidth() - 1))
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.attr("height", height - marginTop - marginBottom)
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.attr("fill", color);
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tickAdjust = () => {};
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}
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svg.append("g")
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.attr("transform", `translate(0,${height - marginBottom})`)
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.call(d3.axisBottom(x)
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.ticks(ticks, typeof tickFormat === "string" ? tickFormat : undefined)
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.tickFormat(typeof tickFormat === "function" ? tickFormat : undefined)
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.tickSize(tickSize)
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.tickValues(tickValues))
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.call(tickAdjust)
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.call(g => g.select(".domain").remove())
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.call(g => g.append("text")
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.attr("x", marginLeft)
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.attr("y", marginTop + marginBottom - height - 6)
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.attr("fill", "currentColor")
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.attr("text-anchor", "start")
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.attr("font-weight", "bold")
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.attr("class", "title")
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.text(title));
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return svg.node();
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}
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)}
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function _legend(Legend){return(
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function legend({color, ...options}) {
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return Legend(color, options);
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}
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)}
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function _Swatches(d3,htl){return(
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function Swatches(color, {
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columns = null,
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format,
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unknown: formatUnknown,
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swatchSize = 15,
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swatchWidth = swatchSize,
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swatchHeight = swatchSize,
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marginLeft = 0
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} = {}) {
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const id = `-swatches-${Math.random().toString(16).slice(2)}`;
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const unknown = formatUnknown == null ? undefined : color.unknown();
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const unknowns = unknown == null || unknown === d3.scaleImplicit ? [] : [unknown];
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const domain = color.domain().concat(unknowns);
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if (format === undefined) format = x => x === unknown ? formatUnknown : x;
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function entity(character) {
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return `&#${character.charCodeAt(0).toString()};`;
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}
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if (columns !== null) return htl.html`<div style="display: flex; align-items: center; margin-left: ${+marginLeft}px; min-height: 33px; font: 10px sans-serif;">
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<style>
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.${id}-item {
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break-inside: avoid;
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display: flex;
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align-items: center;
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padding-bottom: 1px;
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}
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.${id}-label {
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white-space: nowrap;
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overflow: hidden;
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text-overflow: ellipsis;
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max-width: calc(100% - ${+swatchWidth}px - 0.5em);
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}
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.${id}-swatch {
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width: ${+swatchWidth}px;
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height: ${+swatchHeight}px;
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margin: 0 0.5em 0 0;
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}
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</style>
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<div style=${{width: "100%", columns}}>${domain.map(value => {
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const label = `${format(value)}`;
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return htl.html`<div class=${id}-item>
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<div class=${id}-swatch style=${{background: color(value)}}></div>
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<div class=${id}-label title=${label}>${label}</div>
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</div>`;
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})}
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</div>
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</div>`;
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return htl.html`<div style="display: flex; align-items: center; min-height: 33px; margin-left: ${+marginLeft}px; font: 10px sans-serif;">
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<style>
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.${id} {
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display: inline-flex;
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align-items: center;
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margin-right: 1em;
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}
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.${id}::before {
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content: "";
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width: ${+swatchWidth}px;
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height: ${+swatchHeight}px;
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margin-right: 0.5em;
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background: var(--color);
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}
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</style>
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<div>${domain.map(value => htl.html`<span class="${id}" style="--color: ${color(value)}">${format(value)}</span>`)}</div>`;
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}
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)}
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function _swatches(Swatches){return(
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function swatches({color, ...options}) {
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return Swatches(color, options);
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}
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)}
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export default function define(runtime, observer) {
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const main = runtime.module();
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main.variable(observer()).define(["md"], _1);
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main.variable(observer()).define(["Legend","d3"], _2);
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main.variable(observer()).define(["Legend","d3"], _3);
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main.variable(observer()).define(["Legend","d3"], _4);
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main.variable(observer()).define(["Legend","d3"], _5);
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main.variable(observer()).define(["Legend","d3"], _6);
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main.variable(observer()).define(["Legend","d3"], _7);
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main.variable(observer()).define(["Legend","d3"], _8);
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main.variable(observer()).define(["Legend","d3"], _9);
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main.variable(observer()).define(["Legend","d3"], _10);
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main.variable(observer()).define(["Legend","d3"], _11);
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main.variable(observer()).define(["Legend","d3"], _12);
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main.variable(observer()).define(["md"], _13);
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main.variable(observer()).define(["Swatches","d3"], _14);
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main.variable(observer()).define(["Swatches","d3"], _15);
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main.variable(observer()).define(["md"], _16);
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main.variable(observer("Legend")).define("Legend", ["d3"], _Legend);
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main.variable(observer("legend")).define("legend", ["Legend"], _legend);
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main.variable(observer("Swatches")).define("Swatches", ["d3","htl"], _Swatches);
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main.variable(observer("swatches")).define("swatches", ["Swatches"], _swatches);
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return main;
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}
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