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HTML Canvas Radial Gradients


The createRadialGradient() Method

The createRadialGradient() method is used to define a radial/circular gradient.

A radial gradient is defined with two imaginary circles: a start circle and an end circle. The gradient starts with the start circle and moves towards the end circle.

The createRadialGradient() method has the following parameters:

Parameter Description
x0 Required. The x-coordinate of the start circle
y0 Required. The y-coordinate of the start circle
r0 Required. The radius of the start circle
x1 Required. The x-coordinate of the end circle
y1 Required. The y-coordinate of the end circle
r1 Required. The radius of the end circle

The gradient object requires two or more color stops.

The addColorStop() method specifies the color stops, and its position along the gradient. The positions can be anywhere between 0 and 1.

To use the gradient, assign it to the fillStyle or strokeStyle property, then draw the shape (rectangle, circle, shape, or text).

Example

Create a radial/circular gradient with two color stops; a light blue color for the start circle of the gradient, and a dark blue color for the end circle. The center of the start circle is placed in position (150,75), with a radius of 15 px. The center of the end circle is placed in position (150,75), with a radius of 150 px. Then, fill the rectangle with the gradient:

Your browser does not support the HTML5 canvas tag.
<script>
const c = document.getElementById("myCanvas");
const ctx = c.getContext("2d");

// Create gradient
const grad=ctx.createRadialGradient(150,75,15,150,75,150);
grad.addColorStop(0,"lightblue");
grad.addColorStop(1,"darkblue");

// Fill rectangle with gradient
ctx.fillStyle = grad;
ctx.fillRect(10,10,280,130);
</script>
Try it Yourself »


Example

Here we set the radius of the end circle to a smaller number (100), and we see that the radial/circular gradient will be smaller:

Your browser does not support the HTML5 canvas tag.
<script>
const c = document.getElementById("myCanvas");
const ctx = c.getContext("2d");

// Create gradient
const grad=ctx.createRadialGradient(150,75,15,150,75,100);
grad.addColorStop(0,"lightblue");
grad.addColorStop(1,"darkblue");

// Fill rectangle with gradient
ctx.fillStyle = grad;
ctx.fillRect(10,10,280,130);
</script>
Try it Yourself »

Example

Here we move the center point of the end circle to get a new look:

Your browser does not support the HTML5 canvas tag.
<script>
const c = document.getElementById("myCanvas");
const ctx = c.getContext("2d");

// Create gradient
const grad=ctx.createRadialGradient(150,75,15,180,95,100);
grad.addColorStop(0,"lightblue");
grad.addColorStop(1,"darkblue");

// Fill rectangle with gradient
ctx.fillStyle = grad;
ctx.fillRect(10,10,280,130);
</script>
Try it Yourself »

Example

Here we add one more color-stop to the gradient to get a new look:

Your browser does not support the HTML5 canvas tag.
<script>
const c = document.getElementById("myCanvas");
const ctx = c.getContext("2d");

// Create gradient
const grad=ctx.createRadialGradient(150,75,15,150,75,150);
grad.addColorStop(0,"lightblue");
grad.addColorStop(0.3,"pink");
grad.addColorStop(1,"darkblue");

// Fill rectangle with gradient
ctx.fillStyle = grad;
ctx.fillRect(10,10,280,130);
</script>
Try it Yourself »

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