CanvasRenderingContext2D: resetTransform() method
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The
CanvasRenderingContext2D.resetTransform()
method of the Canvas 2D API resets the current transform to the identity matrix.
Syntax
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 |
---|
HTML Standard # dom-context-2d-resettransform-dev |
Browser compatibility
BCD tables only load in the browser
See also
- The interface defining this method:
CanvasRenderingContext2D