CanvasRenderingContext2D.createPattern()

The CanvasRenderingContext2D.createPattern() method of the Canvas 2D API creates a pattern using the specified image and repetition. This method returns a CanvasPattern.

This method doesn't draw anything to the canvas directly. The pattern it creates must be assigned to the CanvasRenderingContext2D.fillStyle or CanvasRenderingContext2D.strokeStyle properties, after which it is applied to any subsequent drawing.

Syntax

CanvasPattern ctx.createPattern(image, repetition);

Parameters

image

A CanvasImageSource to be used as the pattern's image. It can be any of the following:

• HTMLImageElement (<img>)
• SVGImageElement (<image>)
• HTMLVideoElement (<video>, by using the capture of the video)
• HTMLCanvasElement (<canvas>)
• ImageBitmap
• OffscreenCanvas

repetition

A DOMString indicating how to repeat the pattern's image. Possible values are:

• "repeat" (both directions)
• "repeat-x" (horizontal only)
• "repeat-y" (vertical only)
• "no-repeat" (neither direction)

If repetition is specified as an empty string ("") or null (but not undefined), a value of "repeat" will be used.

Return value

CanvasPattern

An opaque object describing a pattern.

Examples

Creating a simple pattern

This example uses the createPattern() method to create a CanvasPattern with a repeating source image. Once created, the pattern is assigned to the canvas context's fill style and applied to a rectangle.

HTML

<canvas id="canvas" width="300" height="300"></canvas>

JavaScript

var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');

var img = new Image();
img.src = 'https://mdn.mozillademos.org/files/222/Canvas_createpattern.png';
img.onload = function() {
  var pattern = ctx.createPattern(img, 'repeat');
  ctx.fillStyle = pattern;
  ctx.fillRect(0, 0, 300, 300);
};

Specifications

Browser compatibility

Gecko-specific notes

• Starting with Gecko 5.0 (Firefox 5.0 / Thunderbird 5.0 / SeaMonkey 2.2), specifying a null or undefined image correctly throws a TYPE_MISMATCH_ERR exception.
• Starting with Gecko 16.0 (Firefox 16.0 / Thunderbird 16.0 / SeaMonkey 2.13), specifying null for the repetition parameter is now allowed and results in the repetition being set to "repeat" (bug 762657).

See also

• The interface defining this method: CanvasRenderingContext2D
• CanvasPattern