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:
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 |
---|
HTML Standard # dom-context-2d-transform-dev |
Browser compatibility
BCD tables only load in the browser
See also
- The interface defining this method:
CanvasRenderingContext2D
CanvasRenderingContext2D.setTransform()