Cocos2D-在建筑物之间添加孔和不同的高度

-(id) init
{
    // always call \"super\" init
    // Apple recommends to re-assign \"self\" with the \"super\" return value
    if( (self=[super init] )) {

        moduleSize = 160;

        screenSize = [[CCDirector sharedDirector] winSize];

        CCSpriteFrameCache* frameCache = [CCSpriteFrameCache sharedSpriteFrameCache];
        [frameCache addSpriteFramesWithFile:@\"ModulesScene1.plist\"];

        CCTexture2D* gameArtTexture = [[CCTextureCache sharedTextureCache] addImage:@\"ModulesScene1.png\"];

        // Create the background spritebatch
        spriteBatch = [CCSpriteBatchNode batchNodeWithTexture:gameArtTexture];
        [self addChild:spriteBatch];

        numStripes = 1;

        /* BEGIN MODULES */

        NSString* frameName = [NSString stringWithFormat:@\"Module0-hd.png\"];
        CCSprite* sprite = [CCSprite spriteWithSpriteFrameName:frameName];
        sprite.anchorPoint = CGPointMake(0, 0.5f);
        sprite.position = CGPointMake(0, screenSize.height / 2);
        [spriteBatch addChild:sprite z:0 tag:0];

        frameName = [NSString stringWithFormat:@\"Module0-hd.png\"];
        sprite = [CCSprite spriteWithSpriteFrameName:frameName];
        sprite.anchorPoint = CGPointMake(0, 0.5f);
        sprite.position = CGPointMake((moduleSize - 1.1f), screenSize.height / 2);
        [spriteBatch addChild:sprite z:1 tag:1];

        frameName = [NSString stringWithFormat:@\"Module1-hd.png\"];
        sprite = [CCSprite spriteWithSpriteFrameName:frameName];
        sprite.anchorPoint = CGPointMake(0, 0.5f);
        sprite.position = CGPointMake((moduleSize * 2) - 1.1f, screenSize.height / 2);
        [spriteBatch addChild:sprite z:2 tag:2];

        frameName = [NSString stringWithFormat:@\"Module2-hd.png\"];
        sprite = [CCSprite spriteWithSpriteFrameName:frameName];
        sprite.anchorPoint = CGPointMake(0, 0.5f);
        sprite.position = CGPointMake(((moduleSize * 3) - 1.1f), screenSize.height / 2);
        [spriteBatch addChild:sprite z:3 tag:3];

        frameName = [NSString stringWithFormat:@\"Module0-hd.png\"];
        sprite = [CCSprite spriteWithSpriteFrameName:frameName];
        sprite.anchorPoint = CGPointMake(0, 0.5f);
        sprite.position = CGPointMake(((moduleSize * 4) - 1.1f), screenSize.height / 2);
        [spriteBatch addChild:sprite z:4 tag:4];

        frameName = [NSString stringWithFormat:@\"Module1-hd.png\"];
        sprite = [CCSprite spriteWithSpriteFrameName:frameName];
        sprite.anchorPoint = CGPointMake(0, 0.5f);
        sprite.position = CGPointMake(((moduleSize * 5) - 1.1f), screenSize.height / 2);
        [spriteBatch addChild:sprite z:5 tag:5];

        /* END MODULES */

        // Get current scrollSpped
        scrollSpeed = [[GameManager sharedGameManager] scrollSpeed];

        speedFactors = [[CCArray alloc] initWithCapacity:numStripes];
        [speedFactors addObject:[NSNumber numberWithFloat:2.5f]];
        NSAssert([speedFactors count] == numStripes, @\"speedFactors count does not match numStripes!\");

        [self scheduleUpdate];

    }

    return self;

}

-(void) update:(ccTime)delta
{

    CCSprite* sprite;
    scrollSpeed = [[GameManager sharedGameManager] scrollSpeed];

    CCARRAY_FOREACH([spriteBatch children], sprite)
    {

        NSNumber* factor = [speedFactors objectAtIndex:0];

        CGPoint pos = sprite.position;
        pos.x -= scrollSpeed * [factor floatValue];

        if (pos.x < -screenSize.width)
        {

            pos.x += ((screenSize.width * 2) - 2);

            int x = (arc4random() % 3);

            int xHole = (arc4random() % 10);

            NSString *randomName = nil;

            CCSpriteFrame *randomFrame = [[CCSpriteFrameCache sharedSpriteFrameCache] spriteFrameByName:randomName];
            [sprite setDisplayFrame:randomFrame];

        }

        sprite.position = pos;

    }

}