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86 lines
2.0 KiB
Markdown
86 lines
2.0 KiB
Markdown
# Quadrants
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```js chart-editor
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// <block:data:2>
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const DATA_COUNT = 7;
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const NUMBER_CFG = {count: DATA_COUNT, min: -100, max: 100};
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const data = {
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datasets: [
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{
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label: 'Dataset 1',
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data: Utils.points(NUMBER_CFG),
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borderColor: Utils.CHART_COLORS.red,
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backgroundColor: Utils.transparentize(Utils.CHART_COLORS.red, 0.5),
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},
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{
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label: 'Dataset 2',
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data: Utils.points(NUMBER_CFG),
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borderColor: Utils.CHART_COLORS.blue,
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backgroundColor: Utils.transparentize(Utils.CHART_COLORS.blue, 0.5),
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}
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]
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};
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// </block:data>
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// <block:plugin:1>
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const quadrants = {
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id: 'quadrants',
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beforeDraw(chart, args, options) {
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const {ctx, chartArea: {left, top, right, bottom}, scales: {x, y}} = chart;
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const midX = x.getPixelForValue(0);
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const midY = y.getPixelForValue(0);
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ctx.save();
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ctx.fillStyle = options.topLeft;
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ctx.fillRect(left, top, midX - left, midY - top);
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ctx.fillStyle = options.topRight;
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ctx.fillRect(midX, top, right - midX, midY - top);
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ctx.fillStyle = options.bottomRight;
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ctx.fillRect(midX, midY, right - midX, bottom - midY);
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ctx.fillStyle = options.bottomLeft;
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ctx.fillRect(left, midY, midX - left, bottom - midY);
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ctx.restore();
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}
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};
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// </block:plugin>
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// <block:config:0>
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const config = {
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type: 'scatter',
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data: data,
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options: {
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plugins: {
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quadrants: {
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topLeft: Utils.CHART_COLORS.red,
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topRight: Utils.CHART_COLORS.blue,
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bottomRight: Utils.CHART_COLORS.green,
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bottomLeft: Utils.CHART_COLORS.yellow,
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}
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}
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},
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plugins: [quadrants]
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};
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// </block:config>
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const actions = [
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{
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name: 'Randomize',
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handler(chart) {
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chart.data.datasets.forEach(dataset => {
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dataset.data = Utils.points(NUMBER_CFG);
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});
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chart.update();
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}
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},
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];
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module.exports = {
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actions,
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config,
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};
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```
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## Docs
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* [Data structures (`labels`)](../../general/data-structures.html)
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* [Plugins](../../developers/plugins.html)
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* [Scatter](../../charts/scatter.html)
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