Helpful JavaScripts to develop website

[JavaScriptBank]

Helpful JavaScripts to develop website

JavaScript Image Rotation script with CANVAS in HTML5

Rotating images is not new type of JavaScript effects because they were ever showed on jsB@nk through many JavaScript code examples:

- detail (http://www.javascriptbank.com/image-rotation-without... http://www.javascriptbank.com/javascript.images/image/javascript-image-rotation-script-canvas-html5.jpg (http://www.javascriptbank.com/javascript/image/rotation/javascript-image-rotation-script-canvas-html5/preview/en/)
Demo: JavaScript JavaScript Image Rotation script with CANVAS in HTML5 (http://www.javascriptbank.com/javascript-image-rotation-script-canvas-html5.html/en/)
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[U]How to setup

Step 1: Copy & Paste JavaScript code below in your HEAD section
JavaScript

<script type="text/javascript">
// Created by: Benoit Asselin | http://www.ab-d.fr
// This script downloaded from www.JavaScriptBank.com

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(rota tion=0)';
break;
case 90 :
image.style.filter = 'progid:DXImageTransform.Microsoft.BasicImage(rota tion=1)';
break;
case 180 :
image.style.filter = 'progid:DXImageTransform.Microsoft.BasicImage(rota tion=2)';
break;
case 270 :
case -90 :
image.style.filter = 'progid:DXImageTransform.Microsoft.BasicImage(rota tion=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);
});
</script>

Step 2: Place HTML below in your BODY section
HTML

<!--
/*
This script downloaded from www.JavaScriptBank.com
Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
*/
-->
<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://www.javascriptbank.com/templates/jsb.V8/images/logo_jsbank.jpg" alt="">
<canvas id="canvas"></canvas>
</p>







JavaScript Vertical Marquee (http://www.javascriptbank.com/vertical-marquee.html) - JavaScript DHTML analog clock (http://www.javascriptbank.com/dhtml-analog-clock-ii.html/en/) - JavaScript Backwards Text (http://www.javascriptbank.com/backwards-text-2-index.html)


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