mirror of
https://github.com/chartjs/Chart.js.git
synced 2024-10-07 04:39:06 +02:00
233 lines
8.0 KiB
HTML
233 lines
8.0 KiB
HTML
<!doctype html>
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<html>
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<head>
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<title>Scatter Chart</title>
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<script src="../dist/Chart.bundle.js"></script>
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<script src="http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
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<style>
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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 style="width:75%">
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<div>
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<canvas id="canvas"></canvas>
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</div>
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</div>
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<script src="http://hammerjs.github.io/dist/hammer.min.js"></script>
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<script type="text/javascript">
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var helpers = Chart.helpers;
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function canZoomDirection(mode, dir) {
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if (mode === undefined) {
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return true;
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} else if (typeof mode === 'string') {
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return mode.indexOf(dir) !== -1;
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}
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return false;
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}
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function zoomScaleIn(scale, zoom, center) {
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if (typeof scale.min === 'number' && typeof scale.max === 'number') {
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var newDiff = (scale.max - scale.min) * (zoom - 1);
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scale.options.ticks.min = scale.min + (newDiff / 2);
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scale.options.ticks.max = scale.max - (newDiff / 2);
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} else {
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// Category scale
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var indexDiff = scale.maxIndex - scale.minIndex;
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}
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}
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function doZoom(chartInstance, zoom, center) {
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var ca = chartInstance.chartArea;
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if (!center) {
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center = {
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x: (ca.left + ca.right) / 2,
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y: (ca.top + ca.bottom) / 2,
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}
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}
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if (chartInstance.options.zoom && chartInstance.options.zoom.enabled) {
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// Do the zoom here
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helpers.each(chartInstance.scales, function(scale, id) {
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if (scale.isHorizontal() && canZoomDirection(chartInstance.options.zoom.mode, 'x')) {
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zoomScaleIn(scale, zoom, center);
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} else if (canZoomDirection(chartInstance.options.zoom.mode, 'y')) {
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// Do Y zoom
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zoomScaleIn(scale, zoom, center);
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}
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});
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chartInstance.update();
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}
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}
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// Chartjs Zoom Plugin
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var ZoomPlugin = Chart.PluginBase.extend({
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beforeInit: function(chartInstance) {
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var node = chartInstance.chart.ctx.canvas;
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var options = chartInstance.options;
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var wheelHandler = function(e) {
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if (e.wheelDelta > 0) {
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doZoom(chartInstance, 1.1);
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} else {
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doZoom(chartInstance, 0.909);
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}
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};
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chartInstance._wheelHandler = wheelHandler;
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node.addEventListener('mousewheel', wheelHandler);
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var mc = new window.Hammer.Manager(node);
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mc.add(new Hammer.Pinch());
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var handlePinch = function handlePinch(e) {
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var diff = 1 / (currentPinchScaling) * e.scale;
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doZoom(chartInstance, diff, e.center);
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// Keep track of overall scale
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currentPinchScaling = e.scale;
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};
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// Hammer reports the total scaling. We need the incremental amount
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var currentPinchScaling;
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mc.on('pinchstart', function(e) {
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currentPinchScaling = 1; // reset tracker
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});
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mc.on('pinch', handlePinch);
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mc.on('pinchend', function(e) {
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handlePinch(e);
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currentPinchScaling = null; // reset
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});
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},
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destroy: function(chartInstance) {
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var node = chartInstance.chart.ctx.canvas;
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// Remove wheel handler
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node.removeEventListener('mousewheel', chartInstance._wheelHandler);
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}
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});
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Chart.pluginService.register(new ZoomPlugin());
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</script>
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<script>
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var randomScalingFactor = function() {
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return (Math.random() > 0.5 ? 1.0 : -1.0) * Math.round(Math.random() * 100);
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};
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var randomColor = function(opacity) {
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return 'rgba(' + Math.round(Math.random() * 255) + ',' + Math.round(Math.random() * 255) + ',' + Math.round(Math.random() * 255) + ',' + (opacity || '.3') + ')';
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};
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var scatterChartData = {
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datasets: [{
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label: "My First dataset",
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data: [{
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x: randomScalingFactor(),
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y: randomScalingFactor(),
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}, {
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x: randomScalingFactor(),
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y: randomScalingFactor(),
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}, {
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x: randomScalingFactor(),
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y: randomScalingFactor(),
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}, {
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x: randomScalingFactor(),
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y: randomScalingFactor(),
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}, {
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x: randomScalingFactor(),
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y: randomScalingFactor(),
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}, {
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x: randomScalingFactor(),
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y: randomScalingFactor(),
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}, {
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x: randomScalingFactor(),
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y: randomScalingFactor(),
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}]
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}, {
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label: "My Second dataset",
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data: [{
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x: randomScalingFactor(),
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y: randomScalingFactor(),
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}, {
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x: randomScalingFactor(),
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y: randomScalingFactor(),
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}, {
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x: randomScalingFactor(),
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y: randomScalingFactor(),
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}, {
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x: randomScalingFactor(),
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y: randomScalingFactor(),
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}, {
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x: randomScalingFactor(),
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y: randomScalingFactor(),
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}, {
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x: randomScalingFactor(),
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y: randomScalingFactor(),
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}, {
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x: randomScalingFactor(),
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y: randomScalingFactor(),
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}]
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}]
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};
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$.each(scatterChartData.datasets, function(i, dataset) {
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dataset.borderColor = randomColor(0.4);
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dataset.backgroundColor = randomColor(0.1);
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dataset.pointBorderColor = randomColor(0.7);
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dataset.pointBackgroundColor = randomColor(0.5);
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dataset.pointBorderWidth = 1;
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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.myScatter = Chart.Scatter(ctx, {
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data: scatterChartData,
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options: {
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title: {
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display: true,
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text: 'Chart.js Scatter Chart'
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},
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scales: {
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xAxes: [{
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gridLines: {
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zeroLineColor: "rgba(0,255,0,1)"
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},
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scaleLabel: {
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display: true,
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labelString: 'x axis'
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},
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ticks: {
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maxRotation: 0
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}
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}],
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yAxes: [{
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gridLines: {
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zeroLineColor: "rgba(0,255,0,1)"
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},
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scaleLabel: {
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display: true,
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labelString: 'y axis'
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}
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}]
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},
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zoom: {
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enabled: true,
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mode: 'x'
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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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