CanvasPattern.setTransform()
This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the spec changes.
The CanvasPattern
.setTransform()
method uses an SVGMatrix
object as the pattern's transformation matrix and invokes it on the pattern.
Syntax
void <var>pattern.setTransform(matrix);</var>
Parameters
matrix
- An
SVGMatrix
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 = 'https://mdn.mozillademos.org/files/222/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); };
Edit the code below and see your changes update live in the canvas:
Playable code
<canvas id="canvas" width="400" height="200" class="playable-canvas"></canvas> <svg id="svg1" style="display:none"></svg> <div class="playable-buttons"> <input id="edit" type="button" value="Edit" /> <input id="reset" type="button" value="Reset" /> </div> <textarea id="code" class="playable-code" style="height:120px"> var img = new Image(); img.src = 'https://mdn.mozillademos.org/files/222/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); };</textarea>
var canvas = document.getElementById("canvas"); var ctx = canvas.getContext("2d"); var textarea = document.getElementById("code"); var reset = document.getElementById("reset"); var edit = document.getElementById("edit"); var code = textarea.value; var svg1 = document.getElementById("svg1"); var matrix = svg1.createSVGMatrix(); function drawCanvas() { ctx.clearRect(0, 0, canvas.width, canvas.height); eval(textarea.value); } reset.addEventListener("click", function() { textarea.value = code; drawCanvas(); }); edit.addEventListener("click", function() { textarea.focus(); }) textarea.addEventListener("input", drawCanvas); window.addEventListener("load", drawCanvas);
Specifications
Specification | Status | Comment |
---|---|---|
WHATWG HTML Living Standard The definition of 'CanvasPattern.setTransform' in that specification. |
Living Standard |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | ? | 33 (33) | ? | ? | ? |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | ? | ? | 33.0 (33) | ? | ? | ? |
See also
- The interface defining it,
CanvasPattern
SVGMatrix
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/api/canvaspattern/settransform