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.

SyntaxEdit

void pattern.setTransform(matrix);

Parameters

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

ExamplesEdit

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);

SpecificationsEdit

Specification	Status	Comment
WHATWG HTML Living Standard The definition of 'CanvasPattern.setTransform' in that specification.	Living Standard

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari
Basic support	?	33 (33)	?	?	?

CanvasPattern.setTransform()

SyntaxEdit

Parameters

ExamplesEdit

Using the `setTransform` method

HTML

JavaScript

Playable code

SpecificationsEdit

Browser compatibilityEdit

See alsoEdit

Document Tags and Contributors

CanvasPattern.setTransform()

SyntaxEdit

Parameters

ExamplesEdit

Using the setTransform method

HTML

JavaScript

Playable code

SpecificationsEdit

Browser compatibilityEdit

See alsoEdit

Document Tags and Contributors

Using the `setTransform` method