Web/API/CanvasRenderingContext2D/transform

The CanvasRenderingContext2D.transform() method of the Canvas 2D API multiplies the current transformation with the matrix described by the arguments of this method. This lets you scale, rotate, translate (move), and skew the context.

Note: See also the setTransform() method, which resets the current transform to the identity matrix and then invokes transform().

Syntax

void ctx.transform(a, b, c, d, e, f);

The transformation matrix is described by: <math display="inline">\begin{bmatrix} a & c & e \\ b & d & f \\ 0 & 0 & 1 \\ \end{bmatrix}</math>

Parameters

a (m11): Horizontal scaling. A value of 1 results in no scaling.
b (m12): Vertical skewing.
c (m21): Horizontal skewing.
d (m22): Vertical scaling. A value of 1 results in no scaling.
e (dx): Horizontal translation (moving).
f (dy): Vertical translation (moving).

Examples

Skewing a shape

This example skews a rectangle both vertically (.2) and horizontally (.8). Scaling and translation remain unchanged.

HTML

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

JavaScript

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

ctx.transform(1, .2, .8, 1, 0, 0);
ctx.fillRect(0, 0, 100, 100);

Result

Specifications

Specification	Status	Comment
HTML Living StandardThe definition of 'CanvasRenderingContext2D.transform' in that specification.	Living Standard

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`transform`	Chrome Full support Yes	Edge Full support 12	Firefox Full support 3	IE Full support Yes	Opera Full support Yes	Safari Full support Yes	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support 4	Opera Android Full support Yes	Safari iOS Full support Yes	Samsung Internet Android Full support Yes

Legend

Full support: Full support