125 lines
4.6 KiB
HTML
125 lines
4.6 KiB
HTML
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<title>Legend Example (DOM Legends) | heatmap.js</title>
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<style>
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body, html, h2 { margin:0; padding:0; height:100%;}
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body { font-family:sans-serif; }
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body * { font-weight:200;}
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#heatmapContainerWrapper { width:100%; height:100%; position:absolute; background:rgba(0,0,0,.1); }
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#heatmapContainer { width:100%; height:100%;}
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#heatmapLegend { background:white; position:absolute; bottom:0; right:0; padding:10px; }
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#min { float:left; }
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#max { float:right; }
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h1 { position:absolute; background:black; color:white; padding:10px; font-weight:200;}
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#all-examples-info { position:absolute; background:white; font-size:16px; padding:20px; top:100px; width:350px; line-height:150%; border:1px solid rgba(0,0,0,.2);}
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</style>
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</head>
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<body>
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<div id="heatmapContainerWrapper">
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<div id="heatmapContainer">
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</div>
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<div id="heatmapLegend">
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<h2>Descriptive Legend Title</h2>
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<span id="min"></span>
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<span id="max"></span>
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<img id="gradient" src="" style="width:100%" />
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</div>
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</div>
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<h1>Adding a custom legend to heatmap.js</h1>
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<div id="all-examples-info">
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<strong style="font-weight:bold;line-height:200%;font-size:18px;">Looking for more examples?</strong> <br />Check out the full <a href="http://www.patrick-wied.at/static/heatmapjs/examples.html?utm_source=gh_local" target="_blank">list of all heatmap.js examples</a> with more pointers & inline documentation.
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</div>
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<script src="/build/heatmap.js"></script>
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<script>
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window.onload = function() {
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// helper function
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function $(id) {
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return document.getElementById(id);
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};
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/* legend code */
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// we want to display the gradient, so we have to draw it
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var legendCanvas = document.createElement('canvas');
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legendCanvas.width = 100;
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legendCanvas.height = 10;
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var legendCtx = legendCanvas.getContext('2d');
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var gradientCfg = {};
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function updateLegend(data) {
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// the onExtremaChange callback gives us min, max, and the gradientConfig
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// so we can update the legend
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$('min').innerHTML = data.min;
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$('max').innerHTML = data.max;
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// regenerate gradient image
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if (data.gradient != gradientCfg) {
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gradientCfg = data.gradient;
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var gradient = legendCtx.createLinearGradient(0, 0, 100, 1);
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for (var key in gradientCfg) {
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gradient.addColorStop(key, gradientCfg[key]);
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}
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legendCtx.fillStyle = gradient;
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legendCtx.fillRect(0, 0, 100, 10);
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$('gradient').src = legendCanvas.toDataURL();
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}
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};
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/* legend code end */
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// create a heatmap instance
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var heatmap = h337.create({
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container: document.getElementById('heatmapContainer'),
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maxOpacity: .5,
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radius: 10,
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blur: .75,
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// update the legend whenever there's an extrema change
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onExtremaChange: function onExtremaChange(data) {
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updateLegend(data);
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}
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});
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// boundaries for data generation
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var width = (+window.getComputedStyle(document.body).width.replace(/px/,''));
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var height = (+window.getComputedStyle(document.body).height.replace(/px/,''));
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// generate 1000 datapoints
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var generate = function() {
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// randomly generate extremas
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var extremas = [(Math.random() * 1000) >> 0,(Math.random() * 1000) >> 0];
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var max = Math.max.apply(Math, extremas);
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var min = Math.min.apply(Math,extremas);
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var t = [];
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for (var i = 0; i < 1000; i++) {
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var x = (Math.random()* width) >> 0;
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var y = (Math.random()* height) >> 0;
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var c = ((Math.random()* max-min) >> 0) + min;
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// btw, we can set a radius on a point basis
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var r = (Math.random()* 80) >> 0;
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// add to dataset
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t.push({ x: x, y:y, value: c, radius: r });
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}
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var init = +new Date;
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// set the generated dataset
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heatmap.setData({
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min: min,
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max: max,
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data: t
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});
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console.log('took ', (+new Date) - init, 'ms');
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};
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// initial generate
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generate();
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// whenever a user clicks on the ContainerWrapper the data will be regenerated -> new max & min
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document.getElementById('heatmapContainerWrapper').onclick = function() { generate(); };
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};
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</script>
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</body>
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</html>
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