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CanvasRenderingContext2D.restore()

この記事内

Syntax
Examples
1. Using the restore method
  1. HTML
  2. JavaScript
Specifications
Browser compatibility
See also

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The CanvasRenderingContext2D.restore() method of the Canvas 2D API restores the most recently saved canvas state by popping the top entry in the drawing state stack. If there is no saved state, this method does nothing.

Syntax

void ctx.restore();

Fore more information about the drawing state, see CanvasRenderingContext2D.save().

Examples

Using the `restore` method

This is just a simple code snippet which uses the save() method to save the default state and restore() to restore it later, so that you are able to draw a rect with the default state later.

HTML

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

JavaScript

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

ctx.save(); // save the default state

ctx.fillStyle = "green";
ctx.fillRect(10, 10, 100, 100);

ctx.restore(); // restore to the default state
ctx.fillRect(150, 75, 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.save();
ctx.fillStyle = "green";
ctx.fillRect(10, 10, 100, 100);
ctx.restore();
ctx.fillRect(150, 75, 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
WHATWG HTML Living Standard The definition of 'CanvasRenderingContext2D.restore' in that specification.	Living Standard

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari
Basic support	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)

Feature	Android	Chrome for Android	Firefox Mobile (Gecko)	IE Mobile	Opera Mobile	Safari Mobile
Basic support	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)

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このページの貢献者: fscholz

最終更新者: fscholz, 2014/11/19 7:12:54