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
setTransform(matrix)
Parameters
Return value
None (undefined
).
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
- The interface defining this method:
CanvasPattern
SVGMatrix
DOMMatrix