Away3D - 物体的拖拽移动（Mesh上按住鼠标拖动改对象）

package{
	import flash.display.Sprite;
	import flash.display.StageAlign;
	import flash.display.StageScaleMode;
	import flash.events.Event;
	import flash.events.KeyboardEvent;
	import flash.events.MouseEvent;
	import flash.ui.Keyboard;
	
	import away3d.containers.View3D;
	import away3d.controllers.HoverController;
	import away3d.debug.Trident;
	import away3d.entities.Mesh;
	import away3d.events.MouseEvent3D;
	import away3d.materials.TextureMaterial;
	import away3d.primitives.CubeGeometry;
	import away3d.tools.utils.Drag3D;
	import away3d.utils.Cast;
	
	[SWF(frameRate="60", backgroundColor="#FFFFFF")]
	public class S6 extends Sprite {
		
		private  var _view3D:View3D;
		private var cameraController:HoverController;//360全景展示相机控制器
		
		[Embed(source="assets/cubeTexture3.jpg")]
		private var cubeTextureClass : Class;
		
		private var cubeTextureMaterial:TextureMaterial;
		
		private var _drag:Drag3D;
		
		//记录当前是移动摄像机还是移动物体
		private var _moveCamera:Boolean = true;
		
		private var _lastX:Number = 0;
		private var _lastY:Number = 0;
		private var _scale:Number = 1000;
		
		public function S6() {
			initEngine();
			initMaterials();
			initObjects();
			initListeners();
		}
		
		/**
		 * 初始化引擎
		 */
		private function initEngine():void
		{
			stage.scaleMode = StageScaleMode.NO_SCALE;
			stage.align = StageAlign.TOP_LEFT;
			
			// 创建一个视口
			_view3D = new View3D();
			_view3D.antiAlias = 4; //设置抗锯齿级别
			
			//初始化摄像头
			cameraController = new HoverController(_view3D.camera);
			cameraController.tiltAngle = 15;
			
			addChild(_view3D);
		}
		
		/**
		 * 初始化材质
		 */
		private function initMaterials():void
		{
			cubeTextureMaterial = new TextureMaterial(Cast.bitmapTexture(cubeTextureClass));
		}
		
		/**
		 * 初始化物体
		 */
		private function initObjects():void
		{
			//添加 坐标系
			var trident:Trident = new Trident(500);
			_view3D.scene.addChild(trident);
			
			// 在三维舞台中创建一个方块	
			var cube1:Mesh = new Mesh(new CubeGeometry(200, 200, 200, 1, 1, 1, false), 
				cubeTextureMaterial);
			_view3D.scene.addChild(cube1);
			
			//开启鼠标事件支持
			cube1.mouseEnabled = true;
			//添加 监听 
			cube1.addEventListener(MouseEvent3D.MOUSE_OVER, cubeMouseOver);
			cube1.addEventListener(MouseEvent3D.MOUSE_OUT, cubeMouseOut);
			cube1.addEventListener(MouseEvent3D.MOUSE_DOWN, cubeMouseDown);
			
			//给方块添加拖拽
			_drag = new Drag3D(_view3D, cube1, Drag3D.PLANE_XY);
		}
		
		//鼠标按下
		private function cubeMouseDown(event:MouseEvent3D):void
		{
			_moveCamera = false;
		}
		
		//鼠标移入
		private function cubeMouseOver(event:MouseEvent3D):void{
			var mesh:Mesh = event.object as Mesh;
			mesh.showBounds = true;
		}
		
		//鼠标移出
		private function cubeMouseOut(event:MouseEvent3D):void{
			var mesh:Mesh = event.object as Mesh;
			mesh.showBounds = false;
		}
		
		/**
		 * 初始化监听
		 */
		private function initListeners():void
		{
			addEventListener(Event.ENTER_FRAME, _onEnterFrame);
			//鼠标事件监听
			stage.addEventListener(MouseEvent.MOUSE_DOWN, onMouseDown);
			stage.addEventListener(MouseEvent.MOUSE_UP, onMouseUp);
			stage.addEventListener(MouseEvent.MOUSE_WHEEL,onWheel);
			stage.addEventListener(Event.RESIZE, onResize);
			stage.addEventListener(KeyboardEvent.KEY_UP, keyUpHandler);
			onResize();
		}
		
		//键盘响应事件，控制方块在某个平面区域移动
		private function keyUpHandler(event:KeyboardEvent):void
		{
			switch(event.keyCode)
			{
				case Keyboard.NUMBER_1:
					_drag.plane = Drag3D.PLANE_XY;
					break;
				case Keyboard.NUMBER_2:
					_drag.plane = Drag3D.PLANE_XZ;
					break;
				case Keyboard.NUMBER_3:
					_drag.plane = Drag3D.PLANE_ZY;
					break;
			}
		}
		
		/**
		 * 渲染视图
		 */
		private function _onEnterFrame(e:Event):void
		{		
			//渲染视图
			_view3D.render();
		}
		
		/**
		 * 使用舞台大小一直全屏
		 */
		private function onResize(event:Event = null):void
		{
			_view3D.width = stage.stageWidth;
			_view3D.height = stage.stageHeight;
		}
		
		/**
		 * 鼠标滚轮事件
		 */
		private function onWheel(event:MouseEvent):void
		{
			if (_moveCamera)
			{
				var dist:Number = cameraController.distance / 25;
				if (event.delta > 0)
				{
					_scale -= dist;
				}
				else
				{
					_scale += dist;
				}
				if (_scale > 40000)
				{
					_scale = 40000;
				}
				if (_scale < 100)
				{
					_scale = 100;
				}
				cameraController.distance = _scale;
			}
		}
		
		/**
		 * 鼠标按下事件
		 */
		private function onMouseDown(event:MouseEvent):void
		{
			if (_moveCamera)
			{
				_view3D.stage.addEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler);
				_lastX = _view3D.mouseX;
				_lastY = _view3D.mouseY;
			}
		}
		
		/**
		 * 鼠标弹起事件
		 */
		private function onMouseUp(event:MouseEvent):void
		{
			_view3D.stage.removeEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler);
			_moveCamera = true;
		}
		
		/**
		 * 鼠标移动事件
		 */
		private function mouseMoveHandler(event:MouseEvent):void 
		{
			if (_moveCamera)
			{
				//移动摄像机
				var dx:Number = _view3D.mouseX - _lastX;
				var dy:Number = _view3D.mouseY - _lastY;
				
				cameraController.panAngle += dx;
				cameraController.tiltAngle += dy;
				
				_lastX = _view3D.mouseX;
				_lastY = _view3D.mouseY;
			}
			else
			{
				//移动 3D 小球
				_drag.updateDrag();
			}
		}		
	}
}