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垂直设置精灵动画

ccsprite cocos2d-iphone animation ios

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Daniel Bramhall · 技术社区 · 11 年前

我真的很难让一个精灵在屏幕的顶部产生,然后从上到下制作动画。我一直在遵循雷·温德利希斯的教程,创建一个简单的游戏,然而,它会将精灵从右向左移动,我希望它从上到下移动,现在我被卡住了!以下是我的当前代码:

- (void)addComet:(CCTime)dt
{
    // Make sprite
    CCSprite *comet = [CCSprite spriteWithImageNamed:@"PlayerSprite.png"];

    // Verticle spawn range
    int minY = comet.contentSize.width;
    int maxY = self.contentSize.height - comet.contentSize.height / 2;
    int rangeY = maxY - minY;
    int randomY = (arc4random() % rangeY) + minY;

    // Position comets slightly off the screen
    comet.position = CGPointMake(self.contentSize.width + comet.contentSize.width, randomY);
    [self addChild:comet];

    // Duration range comets take to fly across screen
    int minDuration = 2.0;
    int maxDuration = 4.0;
    int rangeDuration = maxDuration - minDuration;
    int randomDuration = (arc4random() % rangeDuration) + minDuration;

    // Give comet animation
    CCAction *actionMove = [CCActionMoveTo actionWithDuration:randomDuration position:CGPointMake(0, 500)];
    CCAction *actionRemove = [CCActionRemove action];
    [comet runAction:[CCActionSequence actionWithArray:@[actionMove,actionRemove]]];
}

如果有人能给我指出正确的方向,因为我已经在这个问题上坚持了很长时间,只是无法让精灵在屏幕顶部随机生成,然后向下移动到底部。我也看过tweetjump之类的示例代码,但运气不佳。

1 回复 | 直到 11 年前

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T. Benjamin Larsen 11 年前

现在,我的任何项目中都没有Cocos2D,所以不知道是否有错别字,但一般来说,它应该看起来有点像下面的样子。这个想法是所有的彗星都应该从 相同的 Y位置(屏幕外),但具有随机化的水平(x)位置。。。

- (void)addComet:(CCTime)dt
{
    // Make sprite
    CCSprite *comet = [CCSprite spriteWithImageNamed:@"PlayerSprite.png"];

    NSInteger y = self.contentSize.height; // perhaps + comet.contentSize.height / 2, if the anchorPoint is 0.5, 0.5

    // Random horizontal position
    NSInteger maxX = self.contentSize.width;
    NSInteger randomX = (arc4random() % maxX);

    // Position comets slightly off the screen
    comet.position = CGPointMake(randomX, y);
    [self addChild:comet];

    // Duration range comets take to fly across screen
    NSInteger minDuration = 2.0;
    NSInteger maxDuration = 4.0;
    NSInteger rangeDuration = maxDuration - minDuration;
    NSInteger randomDuration = (arc4random() % rangeDuration) + minDuration;

    // Give comet animation
    CCAction *actionMove = [CCActionMoveTo actionWithDuration:randomDuration position:CGPointMake(randomX, 0)]; // Moving it in a straight line vertically
    CCAction *actionRemove = [CCActionRemove action];
    [comet runAction:[CCActionSequence actionWithArray:@[actionMove,actionRemove]]];
}