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:
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 Standard The definition of 'CanvasRenderingContext2D.transform' in that specification. |
Living Standard |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
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
See also
- The interface defining this method:
CanvasRenderingContext2D
CanvasRenderingContext2D.setTransform()