Cocos2d-android (03) 向量

向量的基本运算及动作

 import org.cocos2d.actions.interval.CCJumpBy;
 import org.cocos2d.actions.interval.CCMoveBy;
 import org.cocos2d.layers.CCLayer;
 import org.cocos2d.nodes.CCSprite;
 import org.cocos2d.types.CGPoint;

 public class GameLayer extends CCLayer {

     private CCSprite spriteA;
     private CCSprite spriteB;    

     public GameLayer() {
         spriteA = CCSprite.sprite("player.png");
         spriteB = CCSprite.sprite("player.png");

         this.addChild(spriteA);
         this.addChild(spriteB);

         CGPoint startPoint = CGPoint.ccp(200, 200);
         CGPoint deltaPoint = CGPoint.ccp(400, 400);

         spriteA.setPosition(startPoint);
         spriteB.setPosition(startPoint);

         //向量加法
         CGPoint addPoint = CGPoint.ccpAdd(startPoint, deltaPoint);
         //向量减法
         CGPoint subPoint = CGPoint.ccpSub(startPoint, deltaPoint);
         //向量的乘法（一个向量乘以一个浮点数）
         CGPoint multPoint = CGPoint.ccpMult(startPoint, 2.0f);
         //计算单位向量
         CGPoint normalizePoint = CGPoint.ccpNormalize(startPoint);

         spriteB.setPosition(addPoint);

         //五秒钟内基于当前位置移动deltaPoint（x增加400，y增加400）
         CCMoveBy moveBy = CCMoveBy.action(5, deltaPoint);
         //五秒钟内四次从当前位置跳跃deltaPoint（x增加400，y增加400）
         CCJumpBy jumpBy = CCJumpBy.action(5, deltaPoint, 200, 4);

         spriteB.runAction(jumpBy);
     }
 }