Image Effects : Image Rotate with CANVAS / The JavaScript Source

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General

CANVAS is a new HTML element which can be used to draw graphics using JavaScript. This script will rotate an image a varying amount of degrees: 90, 180, -90, and back to 0. Can be used in many different ways.

rotate:

Notes

Created by: Benoit Asselin
Web Site: http://www.ab-d.fr
Posted: July 11, 2008

Source Code

Paste this source code into the designated areas.

External file

Paste this code into an external JavaScript file named: imgRotateCanvas.js

/* This script and many more are available free online at
The JavaScript Source!! http://javascript.internet.com
Created by: Benoit Asselin | http://www.ab-d.fr */

function rotate(p_deg) {
	if(document.getElementById('canvas')) {
		/*
		Ok!: Firefox 2, Safari 3, Opera 9.5b2
		No: Opera 9.27
		*/
		var image = document.getElementById('image');
		var canvas = document.getElementById('canvas');
		var canvasContext = canvas.getContext('2d');
		
		switch(p_deg) {
			default :
			case 0 :
				canvas.setAttribute('width', image.width);
				canvas.setAttribute('height', image.height);
				canvasContext.rotate(p_deg * Math.PI / 180);
				canvasContext.drawImage(image, 0, 0);
				break;
			case 90 :
				canvas.setAttribute('width', image.height);
				canvas.setAttribute('height', image.width);
				canvasContext.rotate(p_deg * Math.PI / 180);
				canvasContext.drawImage(image, 0, -image.height);
				break;
			case 180 :
				canvas.setAttribute('width', image.width);
				canvas.setAttribute('height', image.height);
				canvasContext.rotate(p_deg * Math.PI / 180);
				canvasContext.drawImage(image, -image.width, -image.height);
				break;
			case 270 :
			case -90 :
				canvas.setAttribute('width', image.height);
				canvas.setAttribute('height', image.width);
				canvasContext.rotate(p_deg * Math.PI / 180);
				canvasContext.drawImage(image, -image.width, 0);
				break;
		};
		
	} else {
		/*
		Ok!: MSIE 6 et 7
		*/
		var image = document.getElementById('image');
		switch(p_deg) {
			default :
			case 0 :
				image.style.filter = 'progid:DXImageTransform.Microsoft.BasicImage(rotation=0)';
				break;
			case 90 :
				image.style.filter = 'progid:DXImageTransform.Microsoft.BasicImage(rotation=1)';
				break;
			case 180 :
				image.style.filter = 'progid:DXImageTransform.Microsoft.BasicImage(rotation=2)';
				break;
			case 270 :
			case -90 :
				image.style.filter = 'progid:DXImageTransform.Microsoft.BasicImage(rotation=3)';
				break;
		};
		
	};
};

// Multiple onload function created by: Simon Willison
// http://simonwillison.net/2004/May/26/addLoadEvent/
function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}

addLoadEvent(function() {
	var image = document.getElementById('image');
	var canvas = document.getElementById('canvas');
	if(canvas.getContext) {
		image.style.visibility = 'hidden';
		image.style.position = 'absolute';
	} else {
		canvas.parentNode.removeChild(canvas);
	};
	
	rotate(0);
});

Head

Paste this code into the HEAD section of your HTML document.


<script type="text/javascript" src="imgRotateCanvas.js"></script>

Body

Paste this code into the BODY section of your HTML document


<p>
	rotate:
	<input type="button" value="0°" onclick="rotate(0);">
	<input type="button" value="90°" onclick="rotate(90);">
	<input type="button" value="180°" onclick="rotate(180);">
	<input type="button" value="-90°" onclick="rotate(-90);">
</p>
<p>
	<img id="image" src="http://javascript.internet.com//img/headerlogo.gif" alt="">
	<canvas id="canvas"></canvas>
</p>

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Head

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User Comments

3. From: markus
10/05/2008 17:14:57

2. From: Dongmook Yi
Very Good.
07/14/2008 02:19:55

1. From: Evgeniy
07/11/2008 01:56:14

Whitepapers and eBooks

Webcasts

Downloads and eKits

Tutorials and Demos

Navigation Menu

Internet.commerce

Internet.com

Developer Channel

Great Sites

Promotions

General

Notes

Source Code

External file

Head

Body

User Comments

3. From: markus10/05/2008 17:14:57

2. From: Dongmook YiVery Good.07/14/2008 02:19:55

1. From: Evgeniy07/11/2008 01:56:14

Whitepapers and eBooks

Webcasts

Downloads and eKits

Tutorials and Demos

3. From: markus
10/05/2008 17:14:57

2. From: Dongmook Yi
Very Good.
07/14/2008 02:19:55

1. From: Evgeniy
07/11/2008 01:56:14