75d72a45e763d7c4d2d645596f173de5

Recently I've been working on developing a Javascript based coverflow (an actual one - with 3D tilts, reflections, etc!). It is based on the cvi_reflex_lib.js from www.netzgesta.de/reflex/ as well as the Prototype and Scriptaculous frameworks for the animations. I won't include them as they are not modified from their original source, but my code is below.

My main problem is getting the animation to be smooth. Also Firefox (on Mac anyway) does some weird stuff with lines on the images when they are tilted. Any help would be appreciated.

Thanks,
Devon

HTML

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<html>
<head>
<script type="text/javascript" src="cvi_reflex_lib.js"></script>
<script type="text/javascript" src="coverflow.js"></script>
<script type="text/javascript" src="lib/prototype.js"></script>
<script type="text/javascript" src="src/scriptaculous.js"></script>
<title>Coverflow</title>

<script>
var coverflow;
function load(){
coverflow = new Coverflow("tmp");
coverflow.add("http://gallery.mac.com/devon.govett/100032/50970014.jpg?derivative=medium&source=web.jpg&type=medium&ver=12124007550006","Sunset", "In Oregon");
coverflow.add("http://gallery.mac.com/devon.govett/100032/50960013.jpg?derivative=medium&source=web.jpg&type=medium&ver=12124010000005","Snowy", "In Oregon");
coverflow.add("http://gallery.mac.com/devon.govett/100032/50970016_2.jpg?derivative=medium&source=web.jpg&type=medium&ver=12124012900006","Another Sunset", "In Oregon");
coverflow.add("http://www.yesterland.com/images-sidetrips/flower2007_floating.jpg","Flower", "Somewhere");
coverflow.render();
}

</script>
</head>
<body onload="load()" bgcolor="black">
<div id="tmp">
</div>
</body>
</html>

Javascript

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function Coverflow(parent){
	var values = new Array();
	this.covers = new Array();
	this.titles = new Array();
	this.descriptions = new Array();
	// Space between covers
	this.cover_spacing = 40;
	
	// Space from top for center cover
	this.top_space = 40;
	
	this.centerItem = 0;
	this.oldCenter = this.centerItem;
	// Space for items, left and right of center, from top
	this.leftright_top_space = 30;
	
	// Space between center and 3d covers
	this.center_space=150;
	
	this.hookEvent = function(element, eventName, callback)
	{
	  if(typeof(element) == "string")
	    element = document.getElementById(element);
	  if(element == null)
	    return;
	  if(element.addEventListener)
	  {
	    element.addEventListener(eventName, callback, false);
	  }
	  else if(element.attachEvent)
	    element.attachEvent("on" + eventName, callback);
	}
	var m = this;
	this.MouseWheel = function(event)
	  {
		  var delta = 0;
		if (!event) event = window.event;
		if (event.wheelDelta)
		{
			delta = event.wheelDelta / 120;
		}
		else if (event.detail)
		{
			delta = -event.detail / 3;
		}
		if (delta){
			if(delta > 0){
				if(m.centerItem-1 >= 0){
					m.slider.setValue(values[m.centerItem-=1]);
				
				}
			}else{
				if(m.centerItem+1 < m.covers.length){	
					m.slider.setValue(values[m.centerItem+=1]);
				
				}	
			}
		}	
		if (event.preventDefault) event.preventDefault();
		event.returnValue = false;
		
	  }
	  
	//Parent DIV element
	 this.parent = document.getElementById(parent);
	 this.hookEvent(window, 'DOMMouseScroll', this.MouseWheel);
	 this.hookEvent(document, 'mousewheel', this.MouseWheel);
	
	//Adds an image to the coverflow
	this.add = function(image, title, description){
		var cover = document.createElement("img");
		cover.src = image;
		cover.width = 200;
		cover.id = "cover "+this.covers.length;
		this.parent.appendChild(cover);
		this.covers[this.covers.length] = cover;
		this.titles[this.covers.length-1] = title;
		this.descriptions[this.descriptions.length] = description;
	}
	
	//Draws the coverflow with reflections, and 3d covers
	this.render = function(){
		this.title = document.createElement("div");
		this.title.style.color = "white";
		this.title.style.position = "absolute";
		this.title.style.left="0px";
		this.title.style.top = "100px";
		this.title.style.zIndex = 2000000;
		this.title.style.width=window.innerWidth+"px";
		this.title.style.textAlign="center";
		this.parent.appendChild(this.title);
		
		this.description = document.createElement("div");
		this.description.style.color = "white";
		this.description.style.position = "absolute";
		this.description.style.left="0px";
		this.description.style.top = "200px";
		this.description.style.zIndex = 2000000;
		this.description.style.width=window.innerWidth+"px";
		this.description.style.textAlign="center";
		this.parent.appendChild(this.description);
		
		var t = this;
		this.ScrollBar = document.createElement('div');
		this.ScrollBar.style.backgroundImage = "url(scrollbar-back.png)";
		this.ScrollBar.style.position="absolute";
		this.ScrollBar.style.top="300px";
		this.ScrollBar.style.left=window.innerWidth/2 - 400/2 + 'px';
		this.ScrollBar.style.width="400px";
		this.ScrollBar.style.zIndex=200;
		
		this.left = document.createElement('img');
		this.left.src = 'scrollbutton-left.png';
		this.left.style.position="absolute";
		this.left.style.left = parseInt(this.ScrollBar.style.left) - 20 + 'px';
		this.left.style.top = parseInt(this.ScrollBar.style.top) + 'px';
		this.left.style.zIndex=0;
		this.left.onclick = function(){t.slider.setValue(values[t.centerItem-=1]);};
		this.parent.appendChild(this.left);
		
		this.right = document.createElement('img');
		this.right.src = 'scrollbutton-right.png';
		this.right.style.position="absolute";
		this.right.style.zIndex=20;
		this.right.style.left="100%";
		this.right.onclick = function(){t.slider.setValue(values[t.centerItem+=1]);};
		
		this.scroller = document.createElement('img');
		this.scroller.src = 'scrollbar-button.png';
		this.scroller.style.zIndex=200;
		this.scroller.width = parseInt(this.ScrollBar.style.width)/this.covers.length;
		this.scroller.height = 16;
		this.ScrollBar.appendChild(this.scroller);
		this.ScrollBar.appendChild(this.right);
		this.parent.appendChild(this.ScrollBar);
		
		
		var tick = this.covers.length;
		for(var i=0;i<this.covers.length;i++){
			values[values.length] = i*tick;
		}	
		this.slider = new Control.Slider(this.scroller,this.ScrollBar,{
				values: values,
				sliderValue:this.centerItem,
				alignX:-2,
				range: $R(0,this.covers.length*this.covers.length-this.covers.length),
				onChange:function(v){
					t.centerItem = v/t.covers.length;
					t.reRender();
				},
		      		onSlide:function(v){
					t.centerItem = v/t.covers.length;
					t.reRender();
				}
		});
		for(var i=0;i<this.covers.length;i++){
			if(i != this.centerItem){
				if(i < this.centerItem){
					cvi_reflex.add(document.getElementById("cover "+i), { tilt: "right" });
				}
				else{
					cvi_reflex.add(document.getElementById("cover "+i), { tilt: "left" });
				}
			}
			else{
				cvi_reflex.add(document.getElementById("cover "+i), { });
				this.title.innerHTML = "<b>"+this.titles[i]+"</b>";
				this.description.innerHTML = this.descriptions[i];
			}
			document.getElementById("cover "+i).style.position = "absolute";
			document.getElementById("cover "+i).onclick = function(){t.slider.setValue(values[this.id.split(" ")[1]]);};
		}
		this.ScrollBar.style.top = document.getElementById("cover "+this.centerItem).offsetTop+
					(document.getElementById("cover "+this.centerItem).offsetHeight + 20)+"px";
				this.left.style.top = parseInt(this.ScrollBar.style.top) + 'px';

		this.title.style.top = document.getElementById("cover "+this.centerItem).offsetTop+
					(document.getElementById("cover "+this.centerItem).offsetHeight-20)+"px";
		this.description.style.top = parseInt(this.title.style.top)+15+"px";			
		this.alignCovers();
	}
	
	//Re-renders the coverflow	
	this.reRender = function(){
		if((this.centerItem < this.covers.length)||(this.centerItem >= 0)){
			if((this.centerItem != this.oldCenter +1)||(this.centerItem != this.oldCenter -1)){
				for(var i=0;i<this.covers.length;i++){
					if(i < this.centerItem){
						cvi_reflex.modify(document.getElementById("cover "+i), {tilt: "right" });
			
					}else{
						cvi_reflex.modify(document.getElementById("cover "+i), {tilt: "left" });
					}
				}
			}		
			if(this.oldCenter < this.centerItem){
				cvi_reflex.modify(document.getElementById("cover "+this.oldCenter), {tilt: "right" });
	
			}else{
				cvi_reflex.modify(document.getElementById("cover "+this.oldCenter), {tilt: "left" });
			}	
			cvi_reflex.modify(document.getElementById("cover "+this.centerItem), {tilt: "none" });
			this.title.innerHTML = "<b>"+this.titles[this.centerItem]+"</b>";
				this.description.innerHTML = this.descriptions[this.centerItem];
			this.alignCovers();
		}	
		
			
			
	}
		
		
		
	//Animates covers going to their locations
	this.alignCovers = function(){
		for(var i=0;i<this.covers.length;i++){
			new Effect.Appear ("cover "+i, {duration: 1});
			if(i == this.centerItem){
				document.getElementById("cover "+i).style.visibility = "visible";  
				document.getElementById("cover "+i).style.zIndex = 100000;
				var yy = window.innerWidth/2 - (parseInt(document.getElementById("cover "+i).style.width)/2);
				new Effect.Move ("cover "+i,{ duration: 1, x: yy, y: 20, mode: 'absolute'});
			}
			else if(i < this.centerItem){
					document.getElementById("cover "+i).style.zIndex = i;
					var yy = ((window.innerWidth/2 - parseInt(document.getElementById("cover "+this.centerItem).style.width)/2 - parseInt(document.getElementById("cover "+i).style.width)) - ((this.centerItem - i)*(i + (i == this.centerItem-1?-15:40))));
					new Effect.Move ("cover "+i,{ duration: 1, x: yy, y: 20, mode: 'absolute'});
			}
			else if(i > this.centerItem){
					document.getElementById("cover "+i).style.zIndex = this.covers.length-i;
					var yy = (window.innerWidth/2 - parseInt(document.getElementById("cover "+this.centerItem).style.width)/2 + parseInt(document.getElementById("cover "+i).style.width)) - (this.centerItem -i)*(i - (i == this.centerItem+1?15:-30));
					new Effect.Move ("cover "+i,{ duration: 1, x: yy, y: 20, mode: 'absolute', });
			}
			if(i < this.centerItem-4){
				new Effect.Fade ("cover "+i, {duration: 1}); 
			}		
			else if(i > this.centerItem+4){
				new Effect.Fade ("cover "+i, {duration: 1});
			}	
			this.oldCenter = this.centerItem;


		}
		
	}	
	return this;
}

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