PV3D_CubeRotation

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license : All rights reserved
modified : 2009-03-12 11:34:03

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/*	
	Copyright (c) 2009 milkmidi	
	All rights reserved.
	http://milkmidi.com
	http://milkmidi.blogspot.com
*/
package
{		
import flash.display.Sprite;
import flash.events.Event;		
import flash.events.MouseEvent;
import flash.geom.Point;
import org.papervision3d.cameras.CameraType;
import org.papervision3d.lights.PointLight3D;
import org.papervision3d.materials.shadematerials.PhongMaterial;
import org.papervision3d.objects.DisplayObject3D;
import org.papervision3d.view.BasicView;
import org.papervision3d.materials.utils.MaterialsList;
import org.papervision3d.objects.primitives.Cube;
import org.papervision3d.events.InteractiveScene3DEvent;
[SWF(frameRate = "41", backgroundColor = "#111111", pageTitle = "milkmidi.com")]
public class PV3DCubeRotationDemo extends BasicView
{	
	private var rootNode	:DisplayObject3D;
	private var cube		:Cube;		
	
	private var vx			:Number = 0;
	private var vy			:Number = 0;
	//速率
	private var decay		:Number = .98;
	//衰竭值		
	private var mousePos	:Point = new Point();
	private var isMouseDown :Boolean = false;
	
	public function PV3DCubeRotationDemo(){
	super(0, 0, true,true,CameraType.TARGET);															
	camera.z = -950;			
			camera.focus = 12;				
			init3DObjects();									
			this.addEventListener(Event.ADDED_TO_STAGE , addToStageHandler);
		}	
		
		private function addToStageHandler(e:Event):void {
			startRendering();			
			stage.addEventListener(MouseEvent.MOUSE_DOWN, function (e:MouseEvent):void {
				isMouseDown = true;
				mousePos.x = stage.mouseX;
				mousePos.y = stage.mouseY;
			});
			stage.addEventListener(MouseEvent.MOUSE_UP, function (e:MouseEvent):void {
				isMouseDown = false;
			});
		}
		private function init3DObjects():void {
			rootNode = new DisplayObject3D();						
			scene.addChild(rootNode);
			
			var _light	 :PointLight3D = new PointLight3D();
			var _phongMat:PhongMaterial = new PhongMaterial(_light, 0xffffff, 0x999999, 10);								
			var _ml		 :MaterialsList = new MaterialsList( { all:_phongMat } );						
			cube = new Cube(_ml, 400, 400, 400);			
			rootNode.addChild(cube);						
		}		
		override protected function onRenderTick(e:Event = null):void {
			if (isMouseDown == true) {							
				var _differenceX:int = mousePos.x - stage.mouseX;
                var _differenceY:int = mousePos.y - stage.mouseY;	
				//算出上一個滑鼠座標和現在座標的距離差
				
				cube.rotationY += _differenceX;
				rootNode.rotationX += _differenceY;
				
				
				
				mousePos.x = stage.mouseX;
				mousePos.y = stage.mouseY;	
				
				vx = _differenceX / 10;			
				vy = _differenceY / 10;
				
			}else {			
				/*
				 * 用上一個滑鼠座標的位置, 減去現在座標的位置
				 * 即可用來當作加速度, 
				 * 加速度再乘上一個衰竭值,
				 * 即可讓加速度慢慢的漸近於0, 
				 * 物件也就可以慢慢的靜止, 
				 * 直到又賦予一個新的加速度。
				 * */				
				vx *= decay;
				vy *= decay;
				cube.rotationY += vx;
				rootNode.rotationX += vy;
			}				
			super.onRenderTick(e);
		}		
	}
}

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PV3D_CubeRotation