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https://github.com/chartjs/Chart.js.git
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8d6e87881a
* Relocate chart type and dataset type defaults * Update types * Separate overrides and descriptors * Update derived sample, use merge for inherit * Don't merge overrides * Review update
112 lines
2.8 KiB
HTML
112 lines
2.8 KiB
HTML
<!doctype html>
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<html>
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<head>
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<title>Derived Chart Type</title>
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<script src="../../dist/chart.min.js"></script>
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<script src="../utils.js"></script>
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<style type="text/css">
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canvas{
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-moz-user-select: none;
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-webkit-user-select: none;
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-ms-user-select: none;
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}
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</style>
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</head>
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<body>
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<div id="container" style="width: 75%;">
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<canvas id="canvas"></canvas>
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</div>
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<script>
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class Custom extends Chart.controllers.bubble {
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draw() {
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// Call bubble controller method to draw all the points
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super.draw(arguments);
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// Now we can do some custom drawing for this dataset. Here we'll draw a box around the first point in each dataset, using `boxStrokeStyle` dataset option for color
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var meta = this.getMeta();
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var pt0 = meta.data[0];
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const {x, y} = pt0.getProps(['x', 'y']);
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const {radius} = pt0.options;
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var ctx = this.chart.ctx;
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ctx.save();
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ctx.strokeStyle = this.options.boxStrokeStyle;
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ctx.lineWidth = 1;
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ctx.strokeRect(x - radius, y - radius, 2 * radius, 2 * radius);
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ctx.restore();
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}
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}
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Custom.id = 'derivedBubble';
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Custom.defaults = {
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// Custom defaults. Bubble defaults are inherited.
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boxStrokeStyle: 'red'
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};
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// Overrides are only inherited, but not merged if defined
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// Custom.overrides = Chart.overrides.bubble;
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// Stores the controller so that the chart initialization routine can look it up
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Chart.register(Custom);
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var color = Chart.helpers.color;
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var bubbleChartData = {
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datasets: [{
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label: 'My First dataset',
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backgroundColor: color(window.chartColors.blue).alpha(0.5).rgbString(),
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borderColor: window.chartColors.blue,
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borderWidth: 1,
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data: [{
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x: randomScalingFactor(),
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y: randomScalingFactor(),
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r: Math.abs(randomScalingFactor()) / 5,
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}, {
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x: randomScalingFactor(),
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y: randomScalingFactor(),
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r: Math.abs(randomScalingFactor()) / 5,
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}, {
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x: randomScalingFactor(),
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y: randomScalingFactor(),
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r: Math.abs(randomScalingFactor()) / 5,
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}, {
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x: randomScalingFactor(),
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y: randomScalingFactor(),
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r: Math.abs(randomScalingFactor()) / 5,
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}, {
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x: randomScalingFactor(),
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y: randomScalingFactor(),
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r: Math.abs(randomScalingFactor()) / 5,
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}, {
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x: randomScalingFactor(),
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y: randomScalingFactor(),
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r: Math.abs(randomScalingFactor()) / 5,
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}, {
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x: randomScalingFactor(),
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y: randomScalingFactor(),
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r: Math.abs(randomScalingFactor()) / 5,
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}]
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}]
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};
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window.onload = function() {
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var ctx = document.getElementById('canvas').getContext('2d');
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window.myChart = new Chart(ctx, {
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type: 'derivedBubble',
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data: bubbleChartData,
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options: {
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responsive: true,
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plugins: {
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title: {
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display: true,
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text: 'Derived Chart Type'
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},
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}
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}
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});
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};
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</script>
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</body>
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</html>
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