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The CanvasRenderingContext2D.setTransform() method of the Canvas 2D API resets (overrides) the current transformation to the identity matrix and then invokes a transformation described by the arguments of this method.

See also the transform() method, which does not override the current transform matrix and multiplies it with a given one.

Syntax

void ctx.setTransform(a, b, c, d, e, f);

The transformation matrix is described by: [acebdf001]\left[ \begin{array}{ccc} a & c & e \\ b & d & f \\ 0 & 0 & 1 \end{array} \right]

Parameters

a (m11)
Horizontal scaling.
b (m12)
Horizontal skewing.
c (m21)
Vertical skewing.
d (m22)
Vertical scaling.
e (dx)
Horizontal moving.
f (dy)
Vertical moving.

Examples

Using the setTransform method

This is just a simple code snippet which uses the setTransform method.

HTML

<canvas id="canvas"></canvas>

JavaScript

var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');

ctx.setTransform(1, 1, 0, 1, 0, 0);
ctx.fillRect(0, 0, 100, 100);

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.setTransform(1,1,0,1,0,0);
ctx.fillRect(0,0,100,100);</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);

Specifications

Specification Status Comment
HTML Living Standard
The definition of 'CanvasRenderingContext2D.setTransform' in that specification.
Living Standard  

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support Yes12 Yes Yes Yes Yes
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes Yes Yes Yes Yes Yes

See also

ドキュメントのタグと貢献者

このページの貢献者: fscholz, nmve, erikadoyle, joaormatos
最終更新者: fscholz,