Try it Yourself: Canvas Radial Gradient

Canvas Radial Gradient

<!DOCTYPE html>
<html>
<body>

<canvas id="glowCanvas" width="300" height="200" style="border:1px solid #ccc;"></canvas>

<script>
const canvas = document.getElementById("glowCanvas");
const ctx = canvas.getContext("2d");

// Same center, growing from a point (r0 = 0) to a 100px circle
const glow = ctx.createRadialGradient(150, 100, 0, 150, 100, 100);
glow.addColorStop(0, "#ffffff");
glow.addColorStop(1, "#3366ff");

ctx.fillStyle = glow;
ctx.fillRect(0, 0, 300, 200);
</script>

</body>
</html>

<!DOCTYPE html>
<html>
<body>

<canvas id="glowCanvas" width="300" height="200" style="border:1px solid #ccc;"></canvas>

<script>
const canvas = document.getElementById("glowCanvas");
const ctx = canvas.getContext("2d");

// Same center, growing from a point (r0 = 0) to a 100px circle
const glow = ctx.createRadialGradient(150, 100, 0, 150, 100, 100);
glow.addColorStop(0, "#ffffff");
glow.addColorStop(1, "#3366ff");

ctx.fillStyle = glow;
ctx.fillRect(0, 0, 300, 200);
</script>

</body>
</html>