Sandy引擎学习笔记：Mode7

由于官方已经提供了这个例子，我干脆弄了一个例子上来，其实也是按它的做法来完成的。



sandy 3.1版本新增了一个类库包sandy.core.scenegraph.mode7



这个类库包里面提供了两个类，一个是Mode7，一个是CameraMode7，这两个类非常有用。Mode7常用在地面，地步一些渲染上，能够提高一些质量，比plane3D要好一些。 而CameraMode7类和Camera3D其实差不多，仅仅是他的一个子类，但是区别在于，他约束Y轴的旋转。

package 
{
	import flash.display.Bitmap;
	import flash.display.Sprite;
	import flash.events.*;
	import flash.net.*;
	import flash.text.*;
	import flash.ui.Keyboard;
	
	import mx.events.*;
	import mx.resources.*;
	
	import sandy.core.Scene3D;
	import sandy.core.data.*;
	import sandy.core.scenegraph.*;
	import sandy.core.scenegraph.mode7.*;
	import sandy.materials.*;
	import sandy.materials.attributes.*;
	import sandy.primitive.*;
	
	[SWF(width='700',height='500',backgroundColor='0xCCBBBB',frameRate='30')]
	public class Example4 extends Sprite
	{
		private var scenne:Scene3D;
		private var camera:Camera3D;
		private var ranY:Number=0.5;
		private var box:Box;
		private var box2:Box;
		private var box3:Box;
		private var plane:Plane3D;

        [Embed(source="map.jpg")]
		 public var pic:Class;
        private var bitmap:Bitmap;
        private var _upPush:int;
		private var _downPush:int;
		private var _leftPush:int;
		private var _rightPush:int;
        private var _mode7:Mode7;
		public function Example4()
		{
			bitmap=new pic() as Bitmap;
			
			camera=new CameraMode7(700,500);
			camera.x = 0;
			camera.y = 100;
			camera.z = 0;
			camera.tilt =20;

			var root:Group=createScene();
			scenne=new Scene3D("scene1",this,camera,root);	 
			addEventListener(Event.ENTER_FRAME,Run);
			stage.addEventListener (KeyboardEvent.KEY_DOWN, onKey);
			stage.addEventListener (KeyboardEvent.KEY_UP, onKey);
			
			
		}
		
		private function onKey (kEvt:KeyboardEvent):void
		{
			if (kEvt.type==KeyboardEvent.KEY_DOWN)
			{
				if (kEvt.keyCode==Keyboard.UP)
				{
					_upPush=1;
				}
				else if (kEvt.keyCode == Keyboard.DOWN)
				{
					_downPush=1;
				}
				else if (kEvt.keyCode == Keyboard.LEFT)
				{
					_leftPush=1;
					trace("left");
				}
				else if (kEvt.keyCode == Keyboard.RIGHT)
				{
					_rightPush=1;
				}
			}
			else if (kEvt.type == KeyboardEvent.KEY_UP)
			{
				if (kEvt.keyCode==Keyboard.UP)
				{
					_upPush=0;
				}
				else if (kEvt.keyCode == Keyboard.DOWN)
				{
					_downPush=0;
				}
				else if (kEvt.keyCode == Keyboard.LEFT)
				{
					_leftPush=0;
				}
				else if (kEvt.keyCode == Keyboard.RIGHT)
				{
					_rightPush=0;
				}
			}
		}
		
		
		
		private function createScene():Group
		{
			var g:Group=new Group();
			box=new Box("box",50,50,50);
			box.x=-20;
			box.y=0;
			box.z=-100;
			box.rotateX=50;
			
			
		    box2=new Box("box2",50,50,50);
			box2.x=50;
			box2.y=0;
			box2.z=-100;
			box2.rotateX=50;
		
			 
			box3=new Box("box3",50,50,50);
			box3.x=120;
			box3.y=0;
			box3.z=-100;
			box3.rotateX=50;

             _mode7 = new Mode7();			 
			_mode7.setBitmap ( bitmap.bitmapData );
			_mode7.setHorizon (true, 0x000000, 1);
			_mode7.setNearFar (true);	
		 				
        g.addChild( _mode7);
	    g.addChild(box);
		g.addChild(box2);
	    g.addChild(box3);
	    _mode7.repeatMap = false;
			var materialAttr:MaterialAttributes = new MaterialAttributes( 
			                     new LineAttributes( 0.5, 0x2111BB, 0 ),
			                     new LightAttributes( true, 0.1)
			                  );

			var material:Material = new ColorMaterial( 0x0000FF, 1, materialAttr );
			var material2:Material = new ColorMaterial( 0x00FF00, 1, materialAttr );
			var material3:Material = new ColorMaterial( 0xFF0000, 1, materialAttr );
	 
			material.lightingEnable = true;
			material2.lightingEnable = true;
			material3.lightingEnable = true;
		 
			
			var app:Appearance = new Appearance( material );
			var app2:Appearance = new Appearance( material2 );
			var app3:Appearance = new Appearance( material3 );
	 
			box.appearance = app;
			box2.appearance = app2;
			box3.appearance = app3;
	 
			box.container.buttonMode = true;
			box2.container.buttonMode = true;
			box3.container.buttonMode = true;
			box.container.addEventListener(MouseEvent.CLICK, clickHandler);
		    box2.container.addEventListener(MouseEvent.CLICK, clickHandler2);
		    box3.container.addEventListener(MouseEvent.CLICK, clickHandler3);
			return g;

		}
		private function Run(event:Event):void
		{
			scenne.render();
			box.rotateY+=1;
			box2.rotateY+=1;
			box3.rotateY+=1;
	 
		    camera.rotateY += (_leftPush - _rightPush) * 2;
		    var rotationRadian:Number=Math.PI*camera.rotateY/180;
			camera.x += Math.sin(- rotationRadian) * (_upPush - _downPush) * 8;
			camera.z += Math.cos(- rotationRadian) * (_upPush - _downPush) * 8;	    
		}
		private function clickHandler(event:MouseEvent):void
		{

			trace("第一个你点了");
			navigateToURL(new URLRequest("http://www.baidu.com"),"_blank");
		}
		private function clickHandler2(event:MouseEvent):void
		{

			trace("第二个你点了我 ");
				navigateToURL(new URLRequest("http://www.google.cn"),"_blank");
		}
		private function clickHandler3(event:MouseEvent):void
		{

			trace("第三个你点了我 ");
				navigateToURL(new URLRequest("http://www.hao123.com"),"_blank");
		}
	}
}

创建一个CameraMode7 摄影机。

camera=new CameraMode7(700,500);
			camera.x = 0;
			camera.y = 100;
			camera.z = 0;
			camera.tilt =20;

创建一个Mode7对象，指定他的位图数据，由于我们是在flex里面编写，所以使用内嵌资料。指定他的位图



[Embed(source="map.jpg")]
public var pic:Class;//内嵌位图

_mode7 = new Mode7();			 
			_mode7.setBitmap ( bitmap.bitmapData );
			_mode7.setHorizon (true, 0x000000, 1);
			_mode7.setNearFar (true);

其中这个程序里面使用了键盘交互，因此对其一些简单算法需要了解一下就可以。



演示地址：http://blog.5d.cn/user45/hero82748274/200903/515641.html

下载文件：http://blog.5d.cn/user45/hero82748274/upload/2009-03/Example4.rar