/* Simple Image Panner and Zoomer (March 11th, 10)
* This notice must stay intact for usage 
* Author: Dynamic Drive at http://www.dynamicdrive.com/
* Visit http://www.dynamicdrive.com/ for full source code
*/

// v1.1 (March 25th, 10): Updated with ability to zoom in/out of image

jQuery.noConflict()

var ddimagepanner={

	magnifyicons: ['images/magnify.gif','images/magnify2.gif', 24,23], //set path to zoom in/out images, plus their dimensions
	maxzoom: 4, //set maximum zoom level (from 1x)

	init:function($, $img, options){
		var s=options
		s.imagesize=[$img.width(), $img.height()]
		s.oimagesize=[$img.width(), $img.height()] //always remember image's original size
		s.pos=(s.pos=="center")? [-(s.imagesize[0]/2-s.wrappersize[0]/2), -(s.imagesize[1]/2-s.wrappersize[1]/2)] : [0, 0] //initial coords of image
		s.pos=[Math.floor(s.pos[0]), Math.floor(s.pos[1])]
		$img.css({position:'absolute', left:s.pos[0], top:s.pos[1]})
		if (s.canzoom=="yes"){ //enable image zooming?
			s.dragcheck={h: (s.wrappersize[0]>s.imagesize[0])? false:true, v:(s.wrappersize[1]>s.imagesize[1])? false:true} //check if image should be draggable horizon and vertically
			s.$statusdiv=$('<div style="position:absolute;color:white;background:#353535;padding:2px 10px;font-size:12px;visibility:hidden">1x Magnify</div>').appendTo(s.$pancontainer) //create DIV to show current magnify level
			s.$statusdiv.css({left:0, top:s.wrappersize[1]-s.$statusdiv.outerHeight(), display:'none', visibility:'visible'})
			this.zoomfunct($, $img, s)
		}
		this.dragimage($, $img, s)
	},

	dragimage:function($, $img, s){
		$img.mousedown(function(e){
			s.pos=[parseInt($img.css('left')), parseInt($img.css('top'))]
			var xypos=[e.clientX, e.clientY]
			$img.bind('mousemove.dragstart', function(e){
				var pos=s.pos, imagesize=s.imagesize, wrappersize=s.wrappersize
				var dx=e.clientX-xypos[0] //distance to move horizontally
				var dy=e.clientY-xypos[1] //vertically
				s.dragcheck={h: (wrappersize[0]>imagesize[0])? false:true, v:(wrappersize[1]>imagesize[1])? false:true}
				if (s.dragcheck.h==true) //allow dragging horizontally?
					var newx=(dx>0)? Math.min(0, pos[0]+dx) : Math.max(-imagesize[0]+wrappersize[0], pos[0]+dx) //Set horizonal bonds. dx>0 indicates drag right versus left
				if (s.dragcheck.v==true) //allow dragging vertically?
					var newy=(dy>0)? Math.min(0, s.pos[1]+dy) : Math.max(-imagesize[1]+wrappersize[1], pos[1]+dy) //Set vertical bonds. dy>0 indicates drag downwards versus up
				$img.css({left:(typeof newx!="undefined")? newx : pos[0], top:(typeof newy!="undefined")? newy : pos[1]})
				return false //cancel default drag action
			})
			return false //cancel default drag action
		})
		$(document).bind('mouseup', function(e){
			$img.unbind('mousemove.dragstart')
		})
	},

	zoomfunct:function($, $img, s){
		var magnifyicons=this.magnifyicons
		var $zoomimages=$('<img src="'+magnifyicons[0]+'" /><img src="'+magnifyicons[1]+'" />')
			.css({width:magnifyicons[2], height:magnifyicons[3], cursor:'pointer', zIndex:1000, position:'absolute',
						top:s.wrappersize[1]-magnifyicons[3]-1, left:s.wrappersize[0]-magnifyicons[2]-3, opacity:0.7
			})
			.attr("title", "Zoom Out")
			.appendTo(s.$pancontainer)
		$zoomimages.eq(0).css({left:parseInt($zoomimages.eq(0).css('left'))-magnifyicons[2]-3, opacity:1}) //position "zoom in" image
			.attr("title", "Zoom In")
		$zoomimages.click(function(e){ //assign click behavior to zoom images
			var $zimg=$(this) //reference image clicked on
			var curzoom=s.curzoom //get current zoom level
			var zoomtype=($zimg.attr("title").indexOf("In")!=-1)? "in" : "out"
			if (zoomtype=="in" && s.curzoom==ddimagepanner.maxzoom || zoomtype=="out" && s.curzoom==1) //exit if user at either ends of magnify levels
				return
			var basepos=[s.pos[0]/curzoom, s.pos[1]/curzoom]
			var newzoom=(zoomtype=="out")? Math.max(1, curzoom-1) : Math.min(ddimagepanner.maxzoom, curzoom+1) //get new zoom level
			$zoomimages.css("opacity", 1)
			if (newzoom==1) //if zoom level is 1x, dim "zoom out" image
				$zoomimages.eq(1).css("opacity", 0.7)
			else if (newzoom==ddimagepanner.maxzoom) //if zoom level is max level, dim "zoom in" image
				$zoomimages.eq(0).css("opacity", 0.7)
			clearTimeout(s.statustimer)
			s.$statusdiv.html(newzoom+"x Magnify").show() //show current zoom status/level
			var nd=[s.oimagesize[0]*newzoom, s.oimagesize[1]*newzoom]
			var newpos=[basepos[0]*newzoom, basepos[1]*newzoom]
			newpos=[(zoomtype=="in" && s.wrappersize[0]>s.imagesize[0] || zoomtype=="out" && s.wrappersize[0]>nd[0])? s.wrappersize[0]/2-nd[0]/2 : Math.max(-nd[0]+s.wrappersize[0], newpos[0]),
				(zoomtype=="in" && s.wrappersize[1]>s.imagesize[1] || zoomtype=="out" && s.wrappersize[1]>nd[1])? s.wrappersize[1]/2-nd[1]/2 : Math.max(-nd[1]+s.wrappersize[1], newpos[1])]
			$img.animate({width:nd[0], height:nd[1], left:newpos[0], top:newpos[1]}, function(){
				s.statustimer=setTimeout(function(){s.$statusdiv.hide()}, 500)
			})
			s.imagesize=nd
			s.curzoom=newzoom
			s.pos=[newpos[0], newpos[1]]
		})
	}

}


jQuery.fn.imgmover=function(options){
	var $=jQuery
	return this.each(function(){ //return jQuery obj
		if (this.tagName!="IMG")
			return true //skip to next matched element 
		var $imgref=$(this)
		if (parseInt(this.style.width)>0 && parseInt(this.style.height)>0) //if image has explicit CSS width/height defined
			ddimagepanner.init($, $imgref, options)
		else if (this.complete){ //account for IE not firing image.onload
			ddimagepanner.init($, $imgref, options)
		}
		else{
			$imgref.bind('load', function(){
				ddimagepanner.init($, $imgref, options)
			})
		}
	})
}


jQuery(document).ready(function($){ //By default look for DIVs with class="pancontainer"
	var $pancontainer=$('div.pancontainer')
	$pancontainer.each(function(){
		var $this=$(this).css({position:'relative', overflow:'hidden', cursor:'move'})
		var $img=$this.find('img:eq(0)') //image to pan
		var options={$pancontainer:$this, pos:$this.attr('data-orient'), curzoom:1, canzoom:$this.attr('data-canzoom'), wrappersize:[$this.width(), $this.height()]}
		$img.imgmover(options)
	})
})