The CanvasPattern.setTransform()
method uses an SVGMatrix
or DOMMatrix
object as the pattern's transformation matrix and invokes it on the pattern.
CanvasPattern.setTransform()
Syntax
setTransform(matrix)
Parameters
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
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
setTransform |
68
|
79
|
33
|
No
|
9
|
11.1
|
68
|
68
|
33
|
10.1
|
11.3
|
10.0
|
dommatrix |
68
|
79
|
79
|
No
|
55
|
11.1
|
68
|
68
|
79
|
48
|
11.3
|
10.0
|
See also
- The interface defining this method:
CanvasPattern
SVGMatrix
DOMMatrix
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/CanvasPattern/setTransform