FlashCS5 Physics

大家好，我是奶綠茶
在 Flash 裡要製作 Physics 效果, 大家該馬上連想到 Box2D
其實 Flash CS5 就有內建這樣的類別, 只是目前 Adobe 還沒公開


你可以在這個路徑下找到 Physics 類別
X:\Program Files\adobe\Adobe Flash CS5\Common\Configuration\ActionScript 3.0\libs


小弟我玩了一下，還滿好上手的, 不過沒有任何的文件, K 起來有點辛苦, 反正先完看看


參考網址：http://heftybyte.com/?p=36

線上Demo請點我
轉載請註明出處

/**
 * @author milkmidi
 * @see http://milkmidi.blogspot.com
 * @version 1.0.1
 * @date created 2010/12/14/
 */
package  {  
 import flash.display.DisplayObject;
 import flash.display.MovieClip;
 import flash.display.Sprite;
 import flash.events.Event;
 import flash.events.MouseEvent;
 import flash.geom.ColorTransform;
 import flash.geom.Point;
 import PffLib.*;
 import swc.Builder_mc;
 import swc.Circle_mc;
 public class CrashDemo extends Sprite {  
  private var _world:World;
  
  public function CrashDemo()  {   
   var _physm:PhysicsManager = new PhysicsManager(this);

   _world = _physm.createWorld();
   _world.enableCollisions(true);
   _world.enableFriction(true);
   _world.setGravity(new Point(0, 500));
   //_world.setDamping(2);
  
   createPhysicsElements();
   createConstraint();   
   createBuilder();   
   
   trace(PhysObj.kCollisionTypeRectangle)
   trace(PhysObj.kCollisionTypeCircle)
   
   addEventListener(Event.ENTER_FRAME , onTickHandler);
  }  
  
 
  
  private function createConstraint():void {
   // top   
   createBox(0, 0, stage.stageWidth , 20);
   // down
   createBox(0, stage.stageHeight - 20, stage.stageWidth , 20);
   
   //left
   createBox(0, 0, 20 , stage.stageHeight);
   //right
   createBox(stage.stageWidth - 20, 0, 20 , stage.stageHeight);
  }
  private function createBox(pX:int , pY:int ,pWidth:int , pHeight:int):void {   
   var _box:Sprite = ElementsUtil.create(ElementsUtil.BOX, pX , pY , pWidth , pHeight );
   addChild(_box);
   
   var _obj:PhysObj = _world.addPhysObj( _box, new Point(0, 0), PhysObj.kCollisionTypeRectangle, false );
   _obj.setNonMoving(true);   
   //_obj.setCoefficientOfFriction(1);   
  }
  
  
  private function createPhysicsElements():void{  
   var _physObj:PhysObj;
   var _c:Sprite = new Circle_mc;
   _c.x = 100;
   _c.addEventListener(MouseEvent.CLICK , function (e:MouseEvent):void {
    
    //var _vx:int = _c.mouseX * -1;
    var _vx:Number = Math.random() * 500 - 200;
    var _vy:Number = Math.random() * 500 + 200;
    //var _vy:int = _c.mouseY ;
    //trace(_c.mouseY , _c.height, _vy);
    _physObj.setLinearVelocity(new Point(_vx * 2, -_vy*2));    
   });
   _c.buttonMode = true;
   
   addChild(_c);   
   _physObj = _world.addPhysObj(  _c , new Point( 1, 1 ) , PhysObj.kCollisionTypeCircle, false );
   _physObj.setAngularVelocity(Math.PI / 2);
   //_physObj.setCoefficientOfFriction(1);
   //_c.physObj = _physObj;
   
   var _mc1:Sprite = ElementsUtil.create(ElementsUtil.BOX, 10, 10, 50, 50);
   addChild(_mc1);
   var _obj1:PhysObj = _world.addPhysObj( 
    _mc1,
    new Point(0, 0), PhysObj.kCollisionTypeRectangle, false
   );  
   _world.addJoint( 0 ,_physObj, new Point(0, 30) , _obj1, new Point(50, 50));
   
  }
  private function createBuilder():void{
   var _c:Builder_mc = new Builder_mc();
   addChild( _c );
   for (var i:int = 0; i < _c.numChildren; i++) {
    var _mc:DisplayObject = _c.getChildAt(i);
    _world.addPhysObj( _mc, new Point(0, 0), PhysObj.kCollisionTypeRectangle, false );
   }
   
   
  }
  
  private function onTickHandler(e:Event):void {
   _world.advanceFrames();
   _world.updateAllObjects();
  }  
 }//__________________________________________________________________________________ End Class
}//__________________________________________________________________________________ End Package
import flash.display.Sprite;

class ElementsUtil {
 public static const BOX  :String = "box";
 public static const CIRCLE :String = "circle";
 public static function create(pType:String , pX:int , pY:int , pWidth:int,pHeight:int):Sprite {
  var sprite:Sprite = new Sprite();
  sprite.graphics.beginFill(0x0);
  switch (pType) {
   case BOX:
    sprite.graphics.drawRect(0, 0, pWidth , pHeight);
    break;
   case CIRCLE:
    sprite.graphics.drawCircle(0, 0, pWidth);
    break;   
  } 
  sprite.graphics.endFill();
  sprite.x = pX;
  sprite.y = pY;
  return sprite;
 }
}