package
{
	import flash.display.Bitmap;
	import flash.display.Sprite;
	import flash.events.MouseEvent;
 
	import gs.TweenMax;
	import gs.easing.Cubic;
 
	import org.papervision3d.core.math.Quaternion;
	import org.papervision3d.events.InteractiveScene3DEvent;
	import org.papervision3d.materials.BitmapMaterial;
	import org.papervision3d.objects.DisplayObject3D;
	import org.papervision3d.objects.primitives.Plane;
	import org.papervision3d.view.BasicView;
 
	[SWF(width="640", height="480", backgroundColor="#000000", frameRate="60")]
	public class TweenToSpatialPlanes extends BasicView
	{
		[Embed(source="assets/1.jpg")]
		private var oneAsset:Class;
		[Embed(source="assets/2.jpg")]
		private var twoAsset:Class;
		[Embed(source="assets/3.jpg")]
		private var threeAsset:Class;
		[Embed(source="assets/4.jpg")]
		private var fourAsset:Class;
		[Embed(source="assets/5.jpg")]
		private var fiveAsset:Class;
		[Embed(source="assets/6.jpg")]
		private var sixAsset:Class;
 
		private var assets:Array = [oneAsset, twoAsset, threeAsset, fourAsset, fiveAsset, sixAsset];
 
		private static const NUM_PLANES:int = 40;
		private static const TWEEN_TIME:Number = 2;
		private static const DISTANCE_FROM_PLANE:Number = 500;
 
		private var cameraWithSlerp:CameraWithSlerp = new CameraWithSlerp();
 
		private var cameraStart:DisplayObject3D = new DisplayObject3D();
		private var cameraTarget:DisplayObject3D = new DisplayObject3D();
 
		private var startQuaternion:Quaternion = null;
		private var endQuaternion:Quaternion = null;
		private var currentQuaternion:Quaternion = null;
 
		public function TweenToSpatialPlanes()
		{
			setupPapervision3D();			
			setupBackground();
			setupPlanes();
 
			singleRender();
		}
 
		private function setupPapervision3D():void
		{
			viewport.interactive = true;
			cameraWithSlerp.target = null;
			cameraWithSlerp.slerp = 0;
			cameraStart.z = -1000;
			scene.addChild(cameraStart);
		}
 
		private function setupBackground():void
		{
			//the background is for the "click outside" events
			var backgroundSprite:Sprite = new Sprite();
 
			backgroundSprite.graphics.beginFill(0x000000);
			backgroundSprite.graphics.drawRect(0, 0, width, height);
			backgroundSprite.graphics.endFill();
 
			addChildAt(backgroundSprite, getChildIndex(viewport));
 
			backgroundSprite.addEventListener(MouseEvent.CLICK, backgroundSprite_clickHandler);
		}
 
		private function setupPlanes():void
		{
			for(var i:int = 0; i < NUM_PLANES; i++)
			{
				var bitmapMaterial:BitmapMaterial = createRandomBitmapMaterial();
				bitmapMaterial.interactive = true;
				bitmapMaterial.doubleSided = true;
				bitmapMaterial.precise = true;
 
				var plane:Plane = new Plane(bitmapMaterial);
 
				plane.x = Math.random() * 5000 - 2500;
				plane.y = Math.random() * 5000 - 2500;
				plane.z = Math.random() * 2500;
				plane.rotationX = Math.random() * 180 -90;
				plane.rotationY = Math.random() * 180 -90;
				plane.rotationZ = Math.random() * 180 -90;
 
				scene.addChild(plane);
 
				plane.addEventListener(InteractiveScene3DEvent.OBJECT_CLICK, plane_objectClickHandler);
			}
		}
 
		private function createRandomBitmapMaterial():BitmapMaterial
		{
			//grab a bitmapAsset from the array (this is very ugly, but not important to the concept :) )
			var bitmap:Bitmap = Bitmap(new assets[Math.floor(Math.random() * assets.length)]);
			var bitmapMaterial:BitmapMaterial = new BitmapMaterial(bitmap.bitmapData);
 
			return bitmapMaterial;
		}
 
		private function plane_objectClickHandler(event:InteractiveScene3DEvent):void
		{
			var plane:Plane = Plane(event.target);
			//put the target behind the plane
			cameraTarget.copyTransform(plane);
			cameraTarget.moveBackward(DISTANCE_FROM_PLANE);
 
			createTween(cameraTarget);
		}
 
		private function backgroundSprite_clickHandler(event:MouseEvent):void
		{
			createTween(cameraStart);
		}
 
		private function createTween(displayObject3d:DisplayObject3D):void
		{
			//when "slerping", this value is a range from 0 to 1
			//0 being the starting total rotation (AKA transformation)
			//1 being the ending total rotation
			cameraWithSlerp.slerp = 0;
 
			var tweenObject:Object = {};
			tweenObject.x = displayObject3d.x;
			tweenObject.y = displayObject3d.y;
			tweenObject.z = displayObject3d.z;
			tweenObject.bezierThrough = [{x:0, y:0, z:0, slerp:.1}];
			tweenObject.ease = Cubic.easeInOut;
			tweenObject.slerp = 1;
			tweenObject.onUpdate = camera_updateCallback;
 
			startQuaternion = Quaternion.createFromMatrix(cameraWithSlerp.transform);
			endQuaternion = Quaternion.createFromMatrix(displayObject3d.transform);
 
			TweenMax.to(cameraWithSlerp, TWEEN_TIME, tweenObject);
		}
 
		private function camera_updateCallback():void
		{
			currentQuaternion = Quaternion.slerp(startQuaternion, endQuaternion, cameraWithSlerp.slerp);
			cameraWithSlerp.transform.copy3x3(currentQuaternion.matrix);
			singleRender();
		}
 
		override public function singleRender():void
		{
			renderer.renderScene(scene, cameraWithSlerp, viewport);
		}
	}
}
 
//a helper class whose sole purpose is to add the slerp property
//I use this for the sake of brevity, but for production code
//you would move this into a new ActionScript file
import org.papervision3d.cameras.Camera3D;
class CameraWithSlerp extends Camera3D
{
	public var slerp:Number = 0;
}