This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The CanvasRenderingContext2D
.resetTransform()
method of the Canvas 2D API resets the current transform to the identity matrix.
Syntax
void ctx.resetTransform();
Examples
Resetting the matrix
This example draws a rotated rectangle after modifying the matrix, and then resets the matrix using the resetTransform()
method.
HTML
<canvas id="canvas"></canvas>
JavaScript
The rotate()
method rotates the transformation matrix by 45°. The fillRect()
method draws a filled rectangle, adjusted according to that matrix.
const canvas = document.getElementById('canvas'); const ctx = canvas.getContext('2d'); // Draw a rotated rectangle ctx.rotate(45 * Math.PI / 180); ctx.fillRect(60, 0, 100, 30); // Reset transformation matrix to the identity matrix ctx.resetTransform();
Result
Continuing with a regular matrix
Whenever you're done drawing transformed shapes, you should call resetTransform()
before rendering anything else. In this example, the first two shapes are drawn with a skew transformation, and the last two are drawn with the identity (regular) transformation.
HTML
<canvas id="canvas"></canvas>
JavaScript
const canvas = document.getElementById('canvas'); const ctx = canvas.getContext('2d'); // Skewed rectangles ctx.transform(1, 0, 1.7, 1, 0, 0); ctx.fillStyle = 'gray'; ctx.fillRect(40, 40, 50, 20); ctx.fillRect(40, 90, 50, 20); // Non-skewed rectangles ctx.resetTransform(); ctx.fillStyle = 'red'; ctx.fillRect(40, 40, 50, 20); ctx.fillRect(40, 90, 50, 20);
Result
The skewed rectangles are gray, and the non-skewed rectangles are red.
Polyfill
You can also use the setTransform()
method to reset the current transform to the identity matrix, like so:
ctx.setTransform(1, 0, 0, 1, 0, 0);
Specifications
Specification | Status | Comment |
---|---|---|
HTML Living Standard The definition of 'CanvasRenderingContext2D.resetTransform' in that specification. |
Living Standard |
Browser compatibility
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
resetTransform | Chrome Full support 31 | Edge Full support 79 | Firefox Full support 36 | IE No support No | Opera Full support Yes | Safari Full support Yes | WebView Android Full support Yes | Chrome Android Full support Yes | Firefox Android Full support 36 | Opera Android No support No | Safari iOS Full support Yes | Samsung Internet Android Full support Yes |
Legend
- Full support
- Full support
- No support
- No support
- Experimental. Expect behavior to change in the future.
- Experimental. Expect behavior to change in the future.
See also
- The interface defining this method:
CanvasRenderingContext2D