CanvasPattern.setTransform()

The CanvasPattern.setTransform() method uses an SVGMatrix or DOMMatrix object as the pattern's transformation matrix and invokes it on the pattern.

Syntax

void pattern.setTransform(matrix);

Parameters

matrix

An SVGMatrix or DOMMatrix to use as the pattern's transformation matrix.

Examples

Using the setTransform method

This is just a simple code snippet which uses the setTransform method to create a CanvasPattern with the specified pattern transformation from an SVGMatrix. The pattern gets applied if you set it as the current fillStyle and gets drawn onto the canvas when using the fillRect() method, for example.

HTML

<canvas id="canvas"></canvas>
<svg id="svg1"></svg>

JavaScript

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

var svg1 = document.getElementById('svg1');
var matrix = svg1.createSVGMatrix();

var img = new Image();
img.src = 'canvas_createpattern.png';

img.onload = function() {
  var pattern = ctx.createPattern(img, 'repeat');
  pattern.setTransform(matrix.rotate(-45).scale(1.5));
  ctx.fillStyle = pattern;
  ctx.fillRect(0, 0, 400, 400);
};

Note that newer browser versions started to support DOMMatrix as an input to setTransform(), so for example you could replace the SVGMatrix in the above example with the following: 

const matrix = new DOMMatrix([1, .2, .8, 1, 0, 0]);

Editable demo

Here's an editable demo of the code snippet above. Try changing the argument to SetTransform() to see the effect it had.

Specifications

Specification
HTML Standard
# dom-canvaspattern-settransform-dev

Browser compatibility

BCD tables only load in the browser

See also