Cocos2d：測試碰撞，說這兩個精靈總是相交

Question

您好，我正在製作一個cocos2d側滾動器。我試圖測試兩個精靈之間的碰撞。我檢查了一下，我爲這些精靈製作的禮物是他們應該做的，但是它說，無論他們是否真的這樣做，這兩個禮物都會相交。下面是代碼：

-(void)checkForRedEnemyCollisions{ 
    CGRect playerRect = CGRectMake(player.position.x -  (player.playerSprite.contentSize.width/2), 
            player.position.y -  (player.playerSprite.contentSize.height/2), 
            player.playerSprite.contentSize.width, 
            player.playerSprite.contentSize.height); 

    CGRect redEnemyRect = CGRectMake(redEnemy.position.x -  (redEnemy.bulletSprite.contentSize.width/2) , 
            redEnemy.position.y -  (redEnemy.bulletSprite.contentSize.height /2), 
            redEnemy.bulletSprite.contentSize.width, 
            redEnemy.bulletSprite.contentSize.height); 
    if (CGRectIntersectsRect(playerRect, redEnemyRect)) { 
     CCLOG(@"collision"); 
    } 
} 

這裏是更多的代碼：

-(id)init{ 
if((self = [super init])){ 
    CGSize size = [[CCDirector sharedDirector]winSize]; 
    screenWidth = size.width; 
    screenHeight = size.height; 

    gravity = 2; 

    playerSprite = [CCSprite spriteWithFile:@"thefinalcharacter.png"]; 
    playerSprite.scale = 1.5; 
    playerSprite.position = ccp(screenWidth/3.4, screenHeight/2); 
    [self addChild:playerSprite z:-3]; 

    [self schedule: @selector(flight:)interval:1.0f/7.0f]; 

    } 
return self; 
} 

-(void)flight:(ccTime)delta{ 
flightCounter ++; 

if (flightCounter % 2){ 
    [playerSprite setTexture:[[CCSprite spriteWithFile:@"thefinalcharacter.png"]texture]]; 
}else{ 
    [playerSprite setTexture:[[CCSprite spriteWithFile:@"thefinalcharacter2.png"]texture]]; 
} 
[self schedule:@selector(updatePosition:)interval:1.0f/30.0f]; 
} 

-(void)updatePosition:(ccTime)delta{ 
if(playerSprite.position.y < 35){ 
    gravity = 0; 
}else if(playerSprite.position.y > screenHeight - 150) { 
     playerSprite.position = ccp(playerSprite.position.x, playerSprite.position.y - 100); 
}else{ 
    gravity = 2; 
} 

playerSprite.position = ccp(playerSprite.position.x, playerSprite.position.y - gravity); 
} 

Answer 1

確保您所創建的邊界矩形的世界座標。

嘗試將點轉換爲如下的世界座標;

CGPoint playerWorldPosition = [player ConvertToWorldSpace:player.position]; 
CGRect playerRect = CGRectMake(playerWorldPosition.x - (player.playerSprite.contentSize.width/2), 
           playerWorldPosition.y - (player.playerSprite.contentSize.height/2), 
           player.playerSprite.contentSize.width, 
           player.playerSprite.contentSize.height); 

對redEnemy也做同樣的事情。這將確保您將它們在世界空間中進行比較，而不是在層次結構中的其他空間中進行比較。

如果您在播放器或redEnemies上使用錨點而不是默認值（0.0,0.0）。使用ConvertToWorldSpaceAR函數而不是ConvertToWorldSpace。