CanvasRenderingContext2D.resetTransform()
This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
The CanvasRenderingContext2D
.resetTransform()
method of the Canvas 2D API resets the current transform by the identity matrix.
Syntax
void <var>ctx.resetTransform();</var>
Examples
Using the resetTransform
method
This is just a simple code snippet which uses the resetTransform
method.
HTML
<canvas id="canvas"></canvas>
JavaScript
var canvas = document.getElementById("canvas"); var ctx = canvas.getContext("2d"); ctx.rotate(45 * Math.PI / 180); ctx.fillRect(70,0,100,30); // reset current transformation matrix to the identity matrix ctx.resetTransform();
Edit the code below and see your changes update live in the canvas:
Playable code
<canvas id="canvas" width="400" height="200" class="playable-canvas"></canvas> <div class="playable-buttons"> <input id="edit" type="button" value="Edit" /> <input id="reset" type="button" value="Reset" /> </div> <textarea id="code" class="playable-code"> ctx.rotate(45 * Math.PI / 180); ctx.fillRect(70,0,100,30); ctx.resetTransform();</textarea>
var canvas = document.getElementById("canvas"); var ctx = canvas.getContext("2d"); var textarea = document.getElementById("code"); var reset = document.getElementById("reset"); var edit = document.getElementById("edit"); var code = textarea.value; function drawCanvas() { ctx.clearRect(0, 0, canvas.width, canvas.height); eval(textarea.value); } reset.addEventListener("click", function() { textarea.value = code; drawCanvas(); }); edit.addEventListener("click", function() { textarea.focus(); }) textarea.addEventListener("input", drawCanvas); window.addEventListener("load", drawCanvas);
Polyfill
You can also use the CanvasRenderingContext2D.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 |
---|---|---|
WHATWG HTML Living Standard The definition of 'CanvasRenderingContext2D.resetTransform' in that specification. |
Living Standard |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | 31 | 36 (36) | Not supported | Not supported | Not supported |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | Not supported | Not supported | 36.0 (36) | Not supported | Not supported | Not supported |
See also
- The interface defining it,
CanvasRenderingContext2D
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/api/canvasrenderingcontext2d/resettransform