CanvasRenderingContext2D.currentTransform

The CanvasRenderingContext2D.currentTransform property of the Canvas 2D API returns or sets a DOMMatrix (current specification) or SVGMatrix (old specification) object for the current transformation matrix.

Syntax

ctx.currentTransform [= value];

value

A DOMMatrix or SVGMatrix object to use as the current transformation matrix.

Examples

Using the currentTransform method

This is just a simple code snippet that uses the currentTransform property to set a transformation matrix.

HTML

<canvas id="canvas"></canvas>

JavaScript

var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');

var matrix = ctx.currentTransform;
matrix.a = 1;
matrix.b = 1;
matrix.c = 0;
matrix.d = 1;
matrix.e = 0;
matrix.f = 0;
ctx.currentTransform = matrix;
ctx.fillRect(0, 0, 100, 100);

Edit the code below and see your changes update live in the canvas (make sure to use a browser that supports this feature — see the compatibility table):

Specifications

Browser compatibility

[1] This feature is deactivated by default. Enable the ExperimentalCanvasFeatures flag to test it.

[2] See bug 928150. Gecko also supports the experimental and prefixed properties mozCurrentTransform and mozCurrentTransformInverse which set or get the current (inverse) transformation matrix.

[3] See WebKit bug 174278.

[4] See https://bugs.chromium.org/p/chromium/issues/detail?id=637940.

See also

• The interface defining it, CanvasPattern
• SVGMatrix
• DOMMatrix