Question

我是cocos2d世界的新手我正在开发我的第一个教程并面临一个问题我的问题是我有一个图像（1024 X 320），我的方向是风景我需要从右到左连续移动该图像为此目的我已经使用雷的太空射击教程（感谢他），但图像不似乎一次又一次出现。我的代码是......

-(id) init
{
    if( (self=[super init])) {
        CGSize screenSize = [CCDirector sharedDirector].winSize;

        // 1) Create the CCParallaxNode
        backgroundNode = [CCParallaxNode node];
        [self addChild:backgroundNode z:-1];

        // 2) Create the sprites we'll add to the CCParallaxNode
        Back = [CCSprite spriteWithFile:@"bg_front_spacedust.png"];
        //Back.position=ccp(screenSize.width/2, screenSize.height/2);
        Back.rotation = -90;
        Back1 = [CCSprite spriteWithFile:@"bg_front_spacedust.png"];
        Back1.rotation = -90;

        // 3) Determine relative movement speeds for space dust and background
        CGPoint dustSpeed = ccp(0.1, 0.1);

        // 4) Add children to CCParallaxNode
        [backgroundNode addChild:Back z:0 parallaxRatio:dustSpeed positionOffset:ccp(screenSize.width/2, screenSize.height/2)];
        NSLog(@"back.content width is...%f",Back.contentSize.width);
        [backgroundNode addChild:Back1 z:1 parallaxRatio:dustSpeed positionOffset:ccp(screenSize.width/2, screenSize.height*2)];

        // 5) Enable updates
        [self scheduleUpdate]; 
}
    return self;
}


- (void)update:(ccTime)dt {

    // 1) Update background position
    CGPoint backgroundScrollVel = ccp(0,-1000);
    backgroundNode.position = ccpAdd(backgroundNode.position, ccpMult(backgroundScrollVel, dt));

    // 2) Check for background elements moving offscreen
    NSArray *spaceDusts = [NSArray arrayWithObjects:Back, Back1, nil];
    for (CCSprite *spaceDust in spaceDusts) {
        if ([backgroundNode convertToWorldSpace:spaceDust.position].x < -spaceDust.contentSize.width) {
            [backgroundNode incrementOffset:ccp(2*spaceDust.contentSize.width,0) forChild:spaceDust];
        }
    }
}

请帮我解决这个问题提前谢谢。

Answer 1

尝试这个

if (backgroundNode.position.y <-screenSize.height*2)
            backgroundNode.position = ccp(0,0);

由于init方法仅在您执行的方法只执行一次时才需要调用，您需要在update方法中再次将backgroundNode的Position设置为0。这里的倍数可能会有所不同

Answer 2

尝试使用此代码创建一个从底部到顶部移动的视差，将CGPointMake（0,1.0）更改为parentNode addChild行中的CGPointMake（1.0,0）。

-(id) init
 {
// always call "super" init
// Apple recommends to re-assign "self" with the "super's" return value
if( (self=[super init]) )
{
    float yPos =0.0;
    NSMutableString *fileNameString = [[NSMutableString alloc]initWithCapacity:0];
    if (IS_IPHONE_5)
    {
        [fileNameString appendString:@"Background-568h.png"];
        yPos= 560.0;
    }
    else
    {
        [fileNameString appendString:@"Background.png"];
        yPos= 470.0;
    }
    background1 = [CCSprite spriteWithFile:fileNameString];
    background1.tag = 1;
    background1.anchorPoint = CGPointMake(0,0);

    background2 = [CCSprite spriteWithFile:fileNameString];
    background2.tag = 2;
    background2.anchorPoint = CGPointMake(0,0);

    background3 = [CCSprite spriteWithFile:fileNameString];
    background3.tag = 3;
    background3.anchorPoint = CGPointMake(0,0);

    background4 = [CCSprite spriteWithFile:fileNameString];
    background4.tag = 4;
    background4.anchorPoint = CGPointMake(0,0);


    paraNode = [CCParallaxNode node];
    [paraNode addChild:background1 z:1 parallaxRatio:CGPointMake(0, 1.0) positionOffset:CGPointMake(0, 0)];
    [paraNode addChild:background2 z:2 parallaxRatio:CGPointMake(0, 1.0) positionOffset:CGPointMake(0, -yPos)];
    [paraNode addChild:background3 z:3 parallaxRatio:CGPointMake(0, 1.0) positionOffset:CGPointMake(0, -yPos*2)];
    [paraNode addChild:background4 z:4 parallaxRatio:CGPointMake(0, 1.0) positionOffset:CGPointMake(0, -yPos*3)];



    [self addChild:paraNode z:-1 tag:123];
    [self updateFrameRate:0.7 andYposition:yPos];

    [fileNameString release];
    fileNameString = nil;
}
return self;
 }

 -(void)updateFrameRate:(float)speedValue andYposition:(float)yposToSet
 {

   move1 = [CCMoveBy actionWithDuration:speedValue position:CGPointMake(0, yposToSet)];
   move2 = [CCMoveBy actionWithDuration:0.0 position:CGPointMake(0, -yposToSet)];
   move3 = [CCMoveBy actionWithDuration:0.0 position:CGPointMake(0, 0)];
   CCSequence* sequence = [CCSequence actions:move1,move2,move3, nil];
   CCRepeatForever* repeat = [CCRepeatForever actionWithAction:sequence];
   [paraNode runAction:repeat];

}

无限滚动精灵（Parallax）

2 个答案: