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    CanvasRenderingContext2D.resetTransform()

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    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 ctx.resetTransform();

    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

    Tag del documento e collaboratori

    Tag: 
     Hanno collaborato alla realizzazione di questa pagina: fscholz
     Ultima modifica di: fscholz,