賽車程式

package { import flash.display.*; import flash.events.*; import flash.geom.*; import flash.utils.*;  import org.papervision3d.cameras.*; import org.papervision3d.materials.*; import org.papervision3d.objects.*; import org.papervision3d.scenes.*; import flash.ui.Keyboard;  [SWF(backgroundColor="#000000", frameRate="60", width="400", height="400")] public class T6step1 extends Sprite {  private static var PI:Number = Math.PI;  private static var TH:Number = PI / 180;    private var container:Sprite;  private var scene:MovieScene3D;  private var camera:Camera3D;    private var map:Sprite;  private var nextPoint:DisplayObject3D;  private var keyCodeDown:Array = null;     public function T6step1()  {   //背景   var bg:Sprite = new Sprite();   addChild(bg);   bg.graphics.beginFill(0x999999);   bg.graphics.drawRect(0, 0, 400, 400);   bg.graphics.endFill();   // initialize the objects   init3D();      // add a listener for the 3D loop   addEventListener(Event.ENTER_FRAME, loop3D);      //地圖   map = new Sprite();   addChild(map);   map.x = 200;   map.y = 200;      stage.focus = this;   this.stage.addEventListener(KeyboardEvent.KEY_DOWN, this.keyDownHandler);   this.stage.addEventListener(KeyboardEvent.KEY_UP, this.keyUpHandler);  }    private function init3D():void{      container = new Sprite();   addChild(container);      container.x = 200;   container.y = 200;      scene = new MovieScene3D(container);      camera = new Camera3D();   camera.zoom = 15;   camera.focus = 100;   //跑道   var newX:Number;   var newZ:Number;   for(var i:int=0; i<360; i+=10){    newX = 900 * formatNum(Math.cos(i*TH), 3);    newZ = 900 * formatNum(Math.sin(i*TH), 3);    scene.addChild(new Cone(new ColorMaterial(0xffcc00), 5, 30, 8, 6, {x:newX, z:newZ}),  "myCone1_" + i);    newX = 800 * formatNum(Math.cos(i*TH), 3);    newZ = 800 * formatNum(Math.sin(i*TH), 3);    scene.addChild(new Cone(new ColorMaterial(0xffcc00), 5, 30, 8, 6, {x:newX, z:newZ}),  "myCone2_" + i);   }      //移動控點   nextPoint = scene.addChild(new DisplayObject3D(), "nextPoint");  }    private function loop3D(event:Event):void{    //camera.hover(0, container.mouseX / 20, container.mouseY / 10);      if(keyCodeDown!=null){    var isMoving:Boolean = false;    for(var i:int=0; i<keyCodeDown.length; i++){     if(keyCodeDown[i]==Keyboard.UP){      nextPoint.moveForward(30);      isMoving = true;     }else if(keyCodeDown[i]==Keyboard.DOWN){      nextPoint.moveBackward(25);      isMoving = true;     }    }    if(isMoving){     for(var i:int=0; i<keyCodeDown.length; i++){      if(keyCodeDown[i]==Keyboard.LEFT){       nextPoint.rotationY-=5;      }else if(keyCodeDown[i]==Keyboard.RIGHT){       nextPoint.rotationY+=5;      }     }    }   }      camera.target = nextPoint;   camera.x = nextPoint.x;   camera.y = nextPoint.y;   camera.z = nextPoint.z;   camera.rotationY = nextPoint.rotationY;   camera.moveBackward(200);   camera.moveUp(30);   //camera.lookAt(nextPoint);      scene.renderCamera(camera);      //地圖   map.graphics.clear();   map.graphics.lineStyle(1);   map.graphics.drawRect(-50, -50, 100, 100);      //方塊群   var myCone:DisplayObject3D;   for(var i:int=0; i<360; i+=10){    myCone = scene.getChildByName("myCone1_" + i);    map.graphics.drawCircle((myCone.x)/20, (myCone.z)/20, 1);    myCone = scene.getChildByName("myCone2_" + i);    map.graphics.drawCircle((myCone.x)/20, (myCone.z)/20, 1);   }      map.graphics.lineStyle(1, 0xff0000);   map.graphics.drawCircle((nextPoint.x)/20, -1*(nextPoint.z)/20, 1);  }    public function keyDownHandler(event:KeyboardEvent):void{   trace(event.keyCode);   if(keyCodeDown==null){    keyCodeDown = new Array();    keyCodeDown.push(event.keyCode);   }else{    for(var i:int=0; i<keyCodeDown.length; i++){     if(keyCodeDown[i]==event.keyCode){      return;     }     keyCodeDown.push(event.keyCode);    }   }  }    public function keyUpHandler(event:KeyboardEvent):void{   if(keyCodeDown!=null){    for(var i:int=keyCodeDown.length-1; i>=0; i--){     if(keyCodeDown[i]==event.keyCode){      keyCodeDown.splice(i, 1);     }    }    if(keyCodeDown.length==0){     keyCodeDown = null;    }   }  }    private function formatNum(num:Number, cnt:Number):Number{   return Math.round(num * Math.pow(10, cnt)) / Math.pow(10, cnt);  } }}