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CanvasRenderingContext2D.resetTransform()

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

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
resetTransform
31
79
36
No
18
10.1
4.4
31
36
18
10.3
2.0

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/resetTransform