cocos2d(背景图片循环滚动)
2014-03-26 18:08 Lves Li 阅读(624) 评论(0) 编辑 收藏 举报背景图片循环滚动 使用action 实现的:
主要有两个背景图片交替循环滚动:我选的两个背景图片的宽度都是1024的 ,所以定义了#define BGIMG_WIDTH 1024
代码如下:
在HelloWorld.h的头文件中声明两个背景图片精灵
#import "cocos2d.h" // HelloWorldLayer @interface HelloWorldLayer : CCLayer { CCSprite *bagSprite1; CCSprite *bagSprite2; }
在.m文件中实现的部分代码:
#import "HelloWorldLayer.h" #import "AppDelegate.h" #pragma mark - HelloWorldLayer #define BGIMG_WIDTH 1024 // HelloWorldLayer implementation @implementation HelloWorldLayer -(id) init { if( (self=[super init]) ) { CGSize winSize=[CCDirector sharedDirector].winSize; bagSprite1=[CCSprite spriteWithFile:@"bag1.jpg"]; bagSprite2=[CCSprite spriteWithFile:@"bag2.jpg"]; bagSprite1.anchorPoint=ccp(0,0); bagSprite2.anchorPoint=ccp(0,0); [bagSprite1 setScaleY:winSize.height/bagSprite1.textureRect.size.height]; //修改背景图片的高度 [bagSprite2 setScaleY:winSize.height/bagSprite2.textureRect.size.height]; bagSprite1.position=ccp(0,0); bagSprite2.position=ccp(-BGIMG_WIDTH,0); //第二张图片的起始位置在第一张的左边 //添加精灵 [self addChild:bagSprite1 z:1]; [self addChild:bagSprite2 z:1]; CCMoveBy *bagSprite1MoveBy=[CCMoveBy actionWithDuration:6.0f position:ccp(BGIMG_WIDTH,0)]; CCMoveBy *bagSprite2MoveBy=[CCMoveBy actionWithDuration:6.0f position:ccp(BGIMG_WIDTH,0)]; CCCallBlock *bagSprite1Finish=[CCCallBlock actionWithBlock:^(void){[self actionFinishedWithSprite:bagSprite1];}]; CCCallBlock *bagSprite2Finish=[CCCallBlock actionWithBlock:^(void){[self actionFinishedWithSprite:bagSprite2];}]; [bagSprite1 runAction:[CCSequence actions:bagSprite1MoveBy,bagSprite1Finish,nil]]; [bagSprite2 runAction:[CCSequence actions:bagSprite2MoveBy,bagSprite2Finish,nil]]; } return self; } -(void)actionFinishedWithSprite:(CCSprite*)theSprite{ if(theSprite.position.x==0){ CCMoveBy *bagSpriteMoveBy=[CCMoveBy actionWithDuration:6.0f position:ccp(BGIMG_WIDTH,0)]; CCCallBlock *bagSpriteFinish=[CCCallBlock actionWithBlock:^(void){[self actionFinishedWithSprite:theSprite];}]; [theSprite runAction:[CCSequence actions:bagSpriteMoveBy,bagSpriteFinish,nil]]; }else if(theSprite.position.x==BGIMG_WIDTH){ [theSprite setPosition:ccp(-BGIMG_WIDTH,0)]; CCMoveBy *bagSpriteMoveBy=[CCMoveBy actionWithDuration:6.0f position:ccp(BGIMG_WIDTH,0)]; CCCallBlock *bagSpriteFinish=[CCCallBlock actionWithBlock:^(void){[self actionFinishedWithSprite:theSprite];}]; [theSprite runAction:[CCSequence actions:bagSpriteMoveBy,bagSpriteFinish,nil]]; } } @end
运行结果: