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<!--
Any copyright is dedicated to the Public Domain.
-->
<head>
<title>Reference for gradient</title>
</head>
<body onload="go()">
<canvas width="400" height="400"></canvas>
<style>
* { margin: 0; }
</style>
<script>
function go() {
let canvas = document.querySelector('canvas');
let ctx = canvas.getContext('2d');
function createCircleWithGradient(x, y, r, fx, fy) {
let gradient = ctx.createRadialGradient(fx, y, 0, x, y, r);
gradient.addColorStop(0, 'lime');
gradient.addColorStop(1, 'red');
ctx.beginPath();
ctx.arc(x, y, 50, 0, 2 * Math.PI);
ctx.fillStyle = gradient;
ctx.fill();
}
createCircleWithGradient(100, 100, 50, 50);
createCircleWithGradient(100, 200, 40, 60);
createCircleWithGradient(200, 100, 50, 250);
createCircleWithGradient(200, 200, 70, 280);
}
</script>
</body>