Question

我有多个精灵放在这样的背景精灵上：

//my background
CCSprite *bg = [CCSprite spriteWithFile:@"imageName.png"];

[self addchild:bg];

然后我将我的项目添加到bg

//this is how i add my items
CCSprite *items = [CCSprite spriteWithFile:@"itemName.png"];

[bg addchild:items];

哦，不要忘记我的汽车精灵

//my car
CCSprite *car = [CCSprite spriteWithFile:@"car.png"];
[self addchild:car];

我使用循环将多个精灵添加到bg上。

现在的问题是如何检测汽车是否与我放置在bg上的多个精灵相撞？

我尝试过使用CGRectIntersectsRect但它不起作用。

我尝试过使用毕达哥拉斯定理方法，再一次不起作用。

有一种方法涉及将项目sprite添加到NSMutableArray中，它也不起作用。

有人可以建议我尝试一种方法吗？

附加代码：

-(void) initializeCarAndItems
{
    car = [CCSprite spriteWithFile:@"android.png"];
    car.position = ccp(screenSize.width/2, screenSize.height * 0.30);
    [self addChild:car z:1];
    carRect = [car boundingBox];
}

-(void) initializeMap
{
    bg1 = [CCSprite spriteWithFile:@"racingBG.png"];
    bg1.anchorPoint = ccp(0, 0);
    bg1.position = ccp(0, 0);

    [self addChild:bg1 z:-1];

    bg2 = [CCSprite spriteWithFile:@"racingBG2.png"];
    bg2.anchorPoint = ccp(0,0);
    bg2.position = ccp(0, bg1.boundingBox.size.height - 1);

    [self addChild:bg2 z:-1];

    convertedWidth = (int)bg1.boundingBox.size.width;
    convertedHeight = (int)bg1.boundingBox.size.height;

    for (y = 0; y < 15; y++)
    {   
        positionX = arc4random()%convertedWidth;
        positionY = arc4random()%convertedHeight;

        items = [CCSprite spriteWithFile:@"item.png"];
        items.position = ccp(positionX, positionY + 300);
        [bg1 addChild:items z:100];
        [itemsArray addObject:items];
    }

    for (y = 0; y < 15; y++)
    {   
        positionX = arc4random()%convertedWidth;
        positionY = arc4random()%convertedHeight;

        items = [CCSprite spriteWithFile:@"item.png"];
        items.position = ccp(positionX, positionY);
        [bg2 addChild:items z:100];
        [itemsArray addObject:items];
    }
}

-(void) accelerate
{
    bg1.position = ccp(0, bg1.position.y - accelerateNumber);
    bg2.position = ccp(0, bg2.position.y - accelerateNumber);

    if (bg1.position.y < -bg1.boundingBox.size.height)
    {
        questionCount++;
        bg1.position = ccp(0, bg2.position.y + bg2.boundingBox.size.height - 1);
        [self question];

        [bg1 removeAllChildrenWithCleanup:YES];
        for (y = 0; y < 15; y++)
        {   
            positionY = arc4random()%convertedHeight;
            positionX = arc4random()%convertedWidth;

            items.position = ccp(positionX, positionY);
            items = [CCSprite spriteWithFile:@"item.png"];
            [bg1 addChild:items z:100];
            [itemsArray addObject:items];
        }
    }
    else if (bg2.position.y < -bg2.boundingBox.size.height)
    {
        questionCount++;
        bg2.position = ccp(0, bg1.position.y + bg1.boundingBox.size.height - 1);
        [self question];

        [bg2 removeAllChildrenWithCleanup:YES];
        for (y = 0; y < 15; y++)
        {   
            positionY = arc4random()%convertedHeight;
            positionX = arc4random()%convertedWidth;

            items.position = ccp(positionX, positionY);
            items = [CCSprite spriteWithFile:@"item.png"];
            [bg2 addChild:items z:100];
            [itemsArray addObject:items];
        }
    }
}

-(void) update:(ccTime)deltaTime
{
    [self ifEdgeOfScreen];
    [self accelerate];

    for (CCSprite *itemFromArray in itemsArray)
    {
        CGRect itemRect = [itemFromArray boundingBox];
        if (CGRectIntersectsRect(carRect, itemRect))
        {
            NSLog(@"Collision!");
        }
    }

    if (leftButton.active == TRUE)
    {
        [self moveLeftRight:1];
    }
    else if (rightButton.active == TRUE)
    {
        [self moveLeftRight:2];
    }
}

更新：

它已修复：）

-(void) update:(ccTime)deltaTime
{
    car = [car boundingbox];

    [self ifEdgeOfScreen];
    [self accelerate];



    for (CCSprite *itemFromArray in itemsArray)
    {
        if (CGRectIntersectsRect(carRect, [itemFromArray boundingbox]))
        {
            NSLog(@"Collision!");
        }
    }

    if (leftButton.active == TRUE)
    {
        [self moveLeftRight:1];
    }
    else if (rightButton.active == TRUE)
    {
        [self moveLeftRight:2];
    }
}

Answer 1

我发现代码有很多问题......

当您致电removeAllChildren时..请确保您也从阵列中移除对象。从父级删除精灵不会将其从阵列中删除。
在update方法中更新汽车方式。所以在你的更新方法

- （void）update：（ccTime）deltaTime {
```
    [self ifEdgeOfScreen];

    [self accelerate];

    carRect = [car boundingBox];
...........
}
```

希望这会有所帮助.. :)

Cocos2d Sprites Collision

1 个答案: