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);
    }
}