/*
 * THIS IS FREE SCRIPT BUT LEAVE THIS COMMENT IF
 * YOU WANT USE THIS CODE ON YOUR SITE
 * 
 * Made by Wilq32, wilq32@gmail.com, Wroclaw, Poland, 01.2009
 * 
 */
/*
Description:

This is an final product of a Wilq32.PhotoEffect Snippet. Actually you can
 use this simple and tiny script to get effect of rotated images directly 
 from client side (for ex. user generated content), and animate them using
 own functions. 


Notices:

Include script after including main jQuery. Whole plugin uses jQuery
namespace and should be compatible with older version (unchecked). 
If you want to get this work in Internet Explorer you will need to 
include ExCanvas also.

Usage:

jQuery(imgElement).rotate(angleValue)
jQuery(imgElement).rotate(parameters)
jQuery(imgElement).rotateAnimation(parameters)
jQuery(imgElement).rotateAnimation(parameters)



Returns:

jQueryRotateElement - !!! NOTICE !!! function return rotateElement
instance to help connect events with actually created 'rotation' element.

Parameters:

    ({angle:angleValue,
     [animateAngle:animateAngleValue],
     [maxAngle:maxAngleValue],
     [minAngle:minAngleValue],
     [bind:[{event: function},{event:function} ] })
jQuery(imgElement).rotateAnimation

Where:

- angleValue - clockwise rotation given in degrees,
- [animateAngleValue] - optional parameter, animate rotating into this value,
- [maxAngleValue] - optional parameter, maximum angle possible for animation,
- [minAngleValue] - optional parameter, minimum angle possible for animation,
- [bind: [ {event: function}...] -optional parameter, list of events binded
  to newly created rotateable object

Examples:

		$(document).ready(function()
		{
			$('#image').rotate(-25);			
		});

		$(document).ready(function()
		{
			$('#image2').rotate({angle:5});	
		});

		$(document).ready(function()
		{
			var rot=$('#image3').rotate({maxAngle:25,minAngle:-55,
			bind:
				[
					{"mouseover":function(){rot.rotateAnimation(85);}},
					{"mouseout":function(){rot.rotateAnimation(-35);}}
				]
			});
		});
*/


jQuery.fn.extend({
ImageRotate:function(parameters)
{	
	if (!this.Wilq32) this.Wilq32={}
	if (this.Wilq32.PhotoEffect) return;
	this.Wilq32.PhotoEffect = new Wilq32.PhotoEffect(this,parameters);
},
rotate:function(parameters)
{
	if (typeof parameters=="undefined") return;
	if (typeof parameters=="number") parameters={angle:parameters};
	if (!this.Wilq32) this.ImageRotate(parameters);
	else 
	{
		this.Wilq32.PhotoEffect._rotate(parameters.angle);
	}
	return this;
},

rotateAnimation:function(parameters)
{
	if (typeof parameters=="undefined") return;
	if (typeof parameters=="number") parameters={angle:parameters};
	if (!this.Wilq32) this.ImageRotate(parameters);
	else 
	{
		this.Wilq32.PhotoEffect._parameters.animateAngle = parameters.angle;
		this.Wilq32.PhotoEffect._animateStart();
	}
	return this;
}

});

Wilq32={};

Wilq32.PhotoEffect=function(img,parameters)
{
			img = img.get(0);
			this._IEfix=img;
			this._parameters=parameters;
			if (!parameters) this._parameters={};
			this._angle=0;
			if (!parameters.angle) this._parameters.angle=0;
			this._temp=document.createElement('span');
			var image=img.src;
			img.parentNode.insertBefore(this._temp,img);
			this._img= new Image();
			this._img.src=image;
			this._img._ref=this;
			jQuery(this._img).bind("load", function()
			{
				this._ref._Loader.call(this._ref);
			});
			if (jQuery.browser.msie) if (this._img.complete) this._Loader();
	
	
}

Wilq32.PhotoEffect.prototype._Loader=function ()
{
	this._IEfix.parentNode.removeChild(this._IEfix);
	var width=this._img.width;
	var height=this._img.height;
	
	this._img._widthMax=this._img._heightMax=Math.sqrt((height)*(height) + (width) * (width));

	this._canvas=document.createElement('canvas');
	this._canvas._ref=this;
	this._canvas.height=width;
	this._canvas.width=height;

	this._canvas.setAttribute('width',width);

	this._temp.appendChild(this._canvas);

	if (jQuery.browser.msie) 
		{	
			// ExCanvas to make it work in IE
			this._canvas.id="Wilq32.PhotoTemp";
			G_vmlCanvasManager.initElement(this._canvas);
			this._canvas=document.getElementById('Wilq32.PhotoTemp');
			this._canvas.id="";							
			this._canvas._ref=this;
		}
	var self = this;
	this._parameters.animateAngle=0;
	if (this._parameters.bind) 
	{
		for (var a in this._parameters.bind) if (this._parameters.bind.hasOwnProperty(a)) 
		for (var b in this._parameters.bind[a]) if (this._parameters.bind[a].hasOwnProperty(b)) 
		jQuery(this._canvas).bind(b,this._parameters.bind[a][b]);
	}
	this._cnv=this._canvas.getContext('2d');
	this._rotate(this._parameters.angle);
}

Wilq32.PhotoEffect.prototype._animateStart=function()
{	
	if (this._timer) clearTimeout(this._timer);
	this._animate();
}
Wilq32.PhotoEffect.prototype._animate=function()
{	

		
	//this._angle+=(this._angle-this._parameters.animateAngle)*0.1;
		
	//if (this._parameters.direction==0) 
	if (typeof this._parameters.animateAngle!="undefined") this._angle-=(this._angle-this._parameters.animateAngle)*0.1;
	if (typeof this._parameters.minAngle!="undefined") if (this._angle<this._parameters.minAngle) this._angle=this._parameters.minAngle;
	if (typeof this._parameters.maxAngle!="undefined") if (this._angle>this._parameters.maxAngle) this._angle=this._parameters.maxAngle; 

	//if (Math.round(this._angle*100)==0) if (this._timer) clearTimeout(this._timer);

	this._rotate(this._angle);
	var self=this;
	this._timer=setTimeout(function()
		{
			self._animate.call(self);
		},10);
}

Wilq32.PhotoEffect.prototype._rotate = function(angle)

{

	if (!this._img.width) return;
	if (typeof angle!="number") return;

//////////
c_angle=angle;
//////////

	angle=(angle%360)* Math.PI / 180;
	var width=this._img.width;
	var height=this._img.height;

//////////

var r=Math.sqrt((width/2)*(width/2) + (height/2) * (height/2));
var deg1=Math.asin((height/2)/r);
deg1=deg1*360/2/Math.PI;	

var deg11=deg1+c_angle;var rad11=2*Math.PI*(deg11)/360.0;
var x11 = r*Math.cos(rad11);var y11 = r*Math.sin(rad11);

var deg12=(90-deg1)*2+c_angle;var rad12=2*Math.PI*(deg1+deg12)/360.0;
var x12 = r*Math.cos(rad12);var y12 = r*Math.sin(rad12);

var rad13 = 2*Math.PI*(deg1-180+c_angle)/360.0;
var x13 = r*Math.cos(rad13);var y13 = r*Math.sin(rad13);

var deg14=(deg1)*2;var rad14=2*Math.PI*(deg1-deg14+c_angle)/360.0;
var x14 = r*Math.cos(rad14);var y14 = r*Math.sin(rad14);

var x_array=new Array(x11, x12, x13, x14);x_array.sort(hikaku);
var x_small=x_array[0];var x_large=x_array[3];

var y_array=new Array(y11, y12, y13, y14);y_array.sort(hikaku);
var y_small=y_array[0];var y_large=y_array[3];

var an1=Math.abs(x_large-x_small);var widthAdd=Math.ceil(an1)-width;
var an2=Math.abs(y_large-y_small);var heightAdd=Math.ceil(an2)-height;

function hikaku(a, b) { return(b - a); }

//////////

//	var widthAdd = this._img._widthMax - width;
//	var heightAdd = this._img._heightMax - height;
	// clear canvas	
	this._canvas.width = width+widthAdd;
	this._canvas.height = height+heightAdd;

	//this._cnv.scale(0.8,0.8); // SCALE - if needed ;)
	
	// REMEMBER: all drawings are read from backwards.. so first function is translate, then rotate, then translate, translate..
	this._cnv.save();
	this._cnv.translate(widthAdd/2,heightAdd/2); // at least center image on screen
	this._cnv.translate(width/2,height/2);		  // we move image back to its orginal 
	this._cnv.rotate(angle);					  // rotate image
	this._cnv.translate(-width/2,-height/2);	  // move image to its center, so we can rotate around its center
	this._cnv.drawImage(this._img, 0, 0);		  // First - we draw image
	this._cnv.restore();
}