Cocos2d-android (03) 向量

向量的基本运算及动作

 1 import org.cocos2d.actions.interval.CCJumpBy;

 2 import org.cocos2d.actions.interval.CCMoveBy;

 3 import org.cocos2d.layers.CCLayer;

 4 import org.cocos2d.nodes.CCSprite;

 5 import org.cocos2d.types.CGPoint;

 6 

 7 public class GameLayer extends CCLayer {

 8     

 9     private CCSprite spriteA;

10     private CCSprite spriteB;    

11 

12     public GameLayer() {

13         spriteA = CCSprite.sprite("player.png");

14         spriteB = CCSprite.sprite("player.png");

15 

16         this.addChild(spriteA);

17         this.addChild(spriteB);

18 

19         CGPoint startPoint = CGPoint.ccp(200, 200);

20         CGPoint deltaPoint = CGPoint.ccp(400, 400);

21 

22         spriteA.setPosition(startPoint);

23         spriteB.setPosition(startPoint);

24         

25         //向量加法

26         CGPoint addPoint = CGPoint.ccpAdd(startPoint, deltaPoint);

27         //向量减法

28         CGPoint subPoint = CGPoint.ccpSub(startPoint, deltaPoint);

29         //向量的乘法（一个向量乘以一个浮点数）

30         CGPoint multPoint = CGPoint.ccpMult(startPoint, 2.0f);

31         //计算单位向量

32         CGPoint normalizePoint = CGPoint.ccpNormalize(startPoint);

33         

34         spriteB.setPosition(addPoint);

35         

36         //五秒钟内基于当前位置移动deltaPoint（x增加400，y增加400）

37         CCMoveBy moveBy = CCMoveBy.action(5, deltaPoint);

38         //五秒钟内四次从当前位置跳跃deltaPoint（x增加400，y增加400）

39         CCJumpBy jumpBy = CCJumpBy.action(5, deltaPoint, 200, 4);

40         

41         spriteB.runAction(jumpBy);

42     }

43 }