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Add radial and linear gradient sample files #6666

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Nov 1, 2019
Merged

Add radial and linear gradient sample files #6666

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10be08c
Add radial gradient sample file
etimberg Nov 1, 2019
9e1914f
Add linear gradient sample as well
etimberg Nov 1, 2019
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119 changes: 119 additions & 0 deletions samples/advanced/line-gradient.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,119 @@
<!doctype html>
<html>
<head>
<title>Linear Gradient</title>
<script src="../../dist/Chart.js"></script>
<script src="../utils.js"></script>
<style>
canvas {
-moz-user-select: none;
-webkit-user-select: none;
-ms-user-select: none;
}
</style>
</head>

<body>
<div style="width: 75%;">
<canvas id="canvas"></canvas>
</div>
<br>
<br>
<button id="randomizeData">Randomize Data</button>
<script>
var chartColors = window.chartColors;
var gradient = null;
var width = null;
var height = null;
var config = {
type: 'line',
data: {
labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
datasets: [{
label: 'My First dataset',
borderColor: function(context) {
var chartArea = context.chart.chartArea;

if (!chartArea) {
// This case happens on initial chart load
return null;
}

var chartWidth = chartArea.right - chartArea.left;
var chartHeight = chartArea.bottom - chartArea.top;
if (gradient === null || width !== chartWidth || height !== chartHeight) {
// Create the gradient because this is either the first render
// or the size of the chart has changed
width = chartWidth;
height = chartHeight;
var ctx = context.chart.ctx;
gradient = ctx.createLinearGradient(0, chartArea.bottom, 0, chartArea.top);
gradient.addColorStop(0, chartColors.blue);
gradient.addColorStop(0.5, chartColors.yellow);
gradient.addColorStop(1, chartColors.red);
}

return gradient;
},
data: [
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor()
],
fill: false,
}]
},
options: {
responsive: true,
title: {
display: true,
text: 'Chart.js Line Chart'
},
tooltips: {
mode: 'index',
intersect: false,
},
hover: {
mode: 'nearest',
intersect: true
},
scales: {
xAxes: [{
display: true,
scaleLabel: {
display: true,
labelString: 'Month'
}
}],
yAxes: [{
display: true,
scaleLabel: {
display: true,
labelString: 'Value'
}
}]
}
}
};

window.onload = function() {
var ctx = document.getElementById('canvas');
window.myPolarArea = new Chart(ctx, config);
};

document.getElementById('randomizeData').addEventListener('click', function() {
config.data.datasets.forEach(function(piece, i) {
piece.data.forEach(function(value, j) {
config.data.datasets[i].data[j] = randomScalingFactor();
});
});
window.myPolarArea.update();
});
</script>
</body>

</html>
117 changes: 117 additions & 0 deletions samples/advanced/radial-gradient.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,117 @@
<!doctype html>
<html>
<head>
<title>Radial Gradient</title>
<script src="../../dist/Chart.js"></script>
<script src="../utils.js"></script>
<style>
canvas {
-moz-user-select: none;
-webkit-user-select: none;
-ms-user-select: none;
}
</style>
</head>

<body>
<div style="width: 75%;">
<canvas id="canvas"></canvas>
</div>
<br>
<br>
<button id="randomizeData">Randomize Data</button>
<script>
var chartColors = window.chartColors;
var gradient = null;
var width = null;
var height = null;
var config = {
type: 'polarArea',
data: {
datasets: [{
data: [
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
],
backgroundColor: function(context) {
var chartArea = context.chart.chartArea;

if (!chartArea) {
// This case happens on initial chart load
return null;
}

var chartWidth = chartArea.right - chartArea.left;
var chartHeight = chartArea.bottom - chartArea.top;
if (gradient === null || width !== chartWidth || height !== chartHeight) {
// Create the gradient because this is either the first render
// or the size of the chart has changed
width = chartWidth;
height = chartHeight;
var centerX = (chartArea.left + chartArea.right) / 2;
var centerY = (chartArea.top + chartArea.bottom) / 2;
var r = Math.min(
(chartArea.right - chartArea.left) / 2,
(chartArea.bottom - chartArea.top) / 2
);
var ctx = context.chart.ctx;
gradient = ctx.createRadialGradient(centerX, centerY, 0, centerX, centerY, r);
gradient.addColorStop(0, chartColors.red);
gradient.addColorStop(0.5, chartColors.green);
gradient.addColorStop(1, chartColors.purple);
}

return gradient;
},
label: 'My dataset' // for legend
}],
labels: [
'Red',
'Orange',
'Yellow',
'Green',
'Blue'
]
},
options: {
responsive: true,
legend: {
position: 'right',
},
title: {
display: true,
text: 'Chart.js Polar Area Chart'
},
scale: {
ticks: {
beginAtZero: true
},
reverse: false
},
animation: {
animateRotate: false,
animateScale: true
}
}
};

window.onload = function() {
var ctx = document.getElementById('canvas');
window.myPolarArea = new Chart(ctx, config);
};

document.getElementById('randomizeData').addEventListener('click', function() {
config.data.datasets.forEach(function(piece, i) {
piece.data.forEach(function(value, j) {
config.data.datasets[i].data[j] = randomScalingFactor();
});
});
window.myPolarArea.update();
});
</script>
</body>

</html>
6 changes: 6 additions & 0 deletions samples/samples.js
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Original file line number Diff line number Diff line change
Expand Up @@ -208,6 +208,12 @@
}, {
title: 'Content Security Policy',
path: 'advanced/content-security-policy.html'
}, {
title: 'Polar Area Radial Gradient',
path: 'advanced/radial-gradient.html'
}, {
title: 'Line Gradient',
path: 'advanced/line-gradient.html'
}]
}];

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