This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The CanvasPattern
.setTransform()
method uses an SVGMatrix
object as the pattern's transformation matrix and invokes it on the pattern.
Syntax
void pattern.setTransform(matrix);
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 |
---|---|---|
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