iOS游戏开发中Cocos2D的坐标位置的关系

释放双眼,带上耳机,听听看~!

接触Cocos2D有段时间了,今天特意研究了下Cocos2D坐标系中各种位置关系,anchor属性,CCNode坐标和地图坐标转换。

先看一段代码:

-(id) init 
{ 
    // always call "super" init 
    // Apple recommends to re-assign "self" with the "super" return value 
    if( (self=[super init])) { 
        CCTMXTiledMap *gameWorld = [CCTMXTiledMap tiledMapWithTMXFile:@"PositionText.tmx"]; 
        [self addChild:gameWorld]; 
        CGSize winSize = [[CCDirector sharedDirector] winSize]; 
        CCLOG(@"gameWorld.mapSize.width:%.2f  gameWorld.mapSize.height:%.2f",gameWorld.mapSize.width, gameWorld.mapSize.height); 
        CCLOG(@"gameWorld.tileSize.width: %.2f  gameWorld.tileSize.height:%.2f", gameWorld.tileSize.width, gameWorld.tileSize.height); 
        CCLOG(@"winSize.width:%.2f  winSize.height:%.2f", winSize.width, winSize.height); 
         
        CCSprite *pointSprite = [CCSprite spriteWithFile:@"point.png"]; 
        [gameWorld addChild:pointSprite z:2 tag:1]; 
        pointSprite.position = ccp(20,20); 
        pointSprite.anchorPoint = ccp(0.5, 0.5); 
         
         
        CCSprite *rectSprite = [CCSprite spriteWithFile:@"myrect.png"]; 
        [gameWorld addChild:rectSprite z:1 tag:1]; 
        rectSprite.position = ccp(20,20); 
        rectSprite.anchorPoint = ccp(0.5, 0.5);      
    } 
    return self; 
}

 

1、加载地图:


CCTMXTiledMap *gameWorld = [CCTMXTiledMap tiledMapWithTMXFile:@"PositionText.tmx"]; 

 

2、获取手机屏幕大小

CGSize winSize = [[CCDirector sharedDirector] winSize]; 

 

3、地图格子数:

gameWorld.mapSize (10,10)   

 

4、地图格子大小:

gameWorld.tileSize    (20,20)

 

5、整个地图大小:

     gameWorld.mapSize * gameWorld.tileSize;

 

当然这里所说的是地图格子是个正方形,非正方形也容易啦。
6、anchor属性

1) 添加一个精灵,这个精灵是个像素为1*1的红色图片,设置坐标为20,20,即在地图的第一个格子的右上角,设置anchorPoint为(0.5, 0.5)
2) 再添加一个精灵,这个精灵是个像素为20*20的蓝色图片,设置坐标为20,20,即在地图的第一个格子的右上角,同样设置anchorPoint为(0.5, 0.5)

运行效果是矩形精灵的中心和在点精灵的位置,即矩形精灵的锚点为第一个格子的右上角(20,20)坐标 处
去掉两个精灵的anchorPoint属性

运行效果和上面相同

设置rectSprite的anchorPoint为ccp(0,0)

运行效果是矩形精灵的左下角与点精灵重合。
设置rectSprite的anchorPoint为ccp(1,1)

运行效果是矩形精灵的右上角与点精灵重合。
同理设置ccp(0.5, 1) , ccp(1, 0.5)等

由上面可以得出:
1)anchorPoint属性默认为ccp(0.5, 0.5)

2)当设置(0,0)时是以左下角为锚点

3)当设置(1, 1)时是以右上角角为锚点

4)由此可以自己推论到底该把锚点设置在哪里

Cocos2D使用的是OpenGL坐标系

OpenGL坐标系:原点在左下角, X轴向右,Y轴向上

IPhone屏幕坐标系:原点在左上角,X轴向右,Y轴向下
很简单的判断方法:由于Cocos2D的坐标系的原点在左下角。所以精灵内部坐标原点也是左下角,即当anchorPoint为(0, 0)时即以左下角为锚点,为(1,1)时就以右上角为锚点,当然(0.5, 0.5)就是以精灵中心为锚点了。由此可以推算出-2,-3….    2, 3….   等值时精灵锚点坐标。

7、坐标转换

-(id) init 
{ 
    // always call "super" init 
    // Apple recommends to re-assign "self" with the "super" return value 
    if( (self=[super init])) { 
        CCTMXTiledMap *gameWorld = [CCTMXTiledMap tiledMapWithTMXFile:@"PositionText.tmx"]; 
        [self addChild:gameWorld]; 
        CGSize winSize = [[CCDirector sharedDirector] winSize]; 
        CCLOG(@"gameWorld.mapSize.width:%.2f  gameWorld.mapSize.height:%.2f",gameWorld.mapSize.width, gameWorld.mapSize.height); 
        CCLOG(@"gameWorld.tileSize.width: %.2f  gameWorld.tileSize.height:%.2f", gameWorld.tileSize.width, gameWorld.tileSize.height); 
        CCLOG(@"winSize.width:%.2f  winSize.height:%.2f", winSize.width, winSize.height); 
         
        CCSprite *pointSprite = [CCSprite spriteWithFile:@"point.png"]; 
        [gameWorld addChild:pointSprite z:2 tag:1]; 
        pointSprite.position = ccp(20,20); 
        //pointSprite.anchorPoint = ccp(0.5, 0.5); 
         
         
        CCSprite *rectSprite = [CCSprite spriteWithFile:@"myrect.png"]; 
        [gameWorld addChild:rectSprite z:1 tag:1]; 
        rectSprite.position = ccp(40,40); 
        rectSprite.anchorPoint = ccp(2, 2);  
         
        [self setIsTouchEnabled:YES]; 
    } 
    return self; 
} 
 
- (void) registerWithTouchDispatcher { 
    [[CCTouchDispatcher sharedDispatcher] addTargetedDelegate:self priority:INT_MIN + 1 swallowsTouches:YES]; 
} 
 
- (BOOL) ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event { 
    CGPoint point = [touch locationInView: [touch view]]; 
    CCLOG(@"Screen coordX: %.2f coordY: %.2f", point.x, point.y); 
     
    point = [[CCDirector sharedDirector] convertToGL: point]; 
    CCLOG(@"OpenGL coordX: %.2f coordY: %.2f", point.x, point.y); 
 
    point = [self convertToNodeSpace: point]; 
    CCLOG(@"CCNode1 coordX: %.2f coordY: %.2f", point.x, point.y); 
 
    point = [self convertTouchToNodeSpace: touch]; 
    CCLOG(@"CCNode2 coordX: %.2f coordY: %.2f", point.x, point.y); 
         
        point = [[CCDirector sharedDirector] convertToUI:point]; 
        CCLOG(@"UIView coordX: %.2f coordY: %.2f", point.x, point.y); 
        
        point = [rectSprite convertTouchToNodeSpaceAR:touch]; 
        CCLOG(@"TouchAR coordX: %.2f coordY: %.2f", point.x, point.y); 
        return YES; CCNode 
} 
 
- (void) ccTouchMoved:(UITouch *)touch withEvent:(UIEvent*)event { 
     
} 
 
- (void) ccTouchEnded:(UITouch *)touch withEvent:(UIEvent*)event { 
     
} 

 

上面的代码添加了UIView的事件处理。由于屏幕和Cocos2D采用不同的坐标系,所以我们需要进行坐标转换。

1)首先获取屏幕坐标

2)将屏幕坐标转换为OpenGL的坐标

3)将OpenGL的坐标转换为Cocos2D的坐标。

从运行结果可以看出Node1和Node2打印出的坐标相同。因为Cocos2D给我们写了covertTouchToNodeSpace方法,可以看看它的源码:

- (CGPoint)convertTouchToNodeSpace:(UITouch *)touch 
{ 
    CGPoint point = [touch locationInView: [touch view]]; 
    point = [[CCDirector sharedDirector] convertToGL: point]; 
    return [self convertToNodeSpace:point]; 
}

 

至于为什么OpenGL和Node1输出既然相同,为什么还要使用convertToNodeSpace,由于能力有限,希望大牛们能给告诉我答案。
UIView输出的是将Cocos2D坐标转换为屏幕即quartz坐标。
4) convertTouchToNodeSpaceAR是将触摸点转换为相对于rectSprite的坐标

8、判断触摸点是否在制定的精灵上

- (BOOL) ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event { 
    CGPoint point = [touch locationInView: [touch view]]; 
    CCLOG(@"Screen coordX: %.2f coordY: %.2f", point.x, point.y); 
     
    point = [[CCDirector sharedDirector] convertToGL: point]; 
    CCLOG(@"OpenGL coordX: %.2f coordY: %.2f", point.x, point.y); 
 
    point = [self convertToNodeSpace: point]; 
    CCLOG(@"CCNode1 coordX: %.2f coordY: %.2f", point.x, point.y); 
 
    point = [self convertTouchToNodeSpace: touch]; 
    CCLOG(@"CCNode2 coordX: %.2f coordY: %.2f", point.x, point.y); 
     
    //point = [[CCDirector sharedDirector] convertToUI:point]; 
    //CCLOG(@"UIView coordX: %.2f coordY: %.2f", point.x, point.y); 
    CCLOG(@"%d", rectSprite.textureRect.size.width); 
     
    CGRect rect = [rectSprite textureRect]; 
    rect = CGRectMake(0, 0, rect.size.width, rect.size.height); 
    CCLOG(@"orgX: %.2f  orgY: %.2f  width:%.2f  height: %.2f",rect.origin.x, rect.origin.y, rect.size.width, rect.size.height); 
     
    point = [rectSprite convertTouchToNodeSpaceAR:touch]; 
    CCLOG(@"TouchAR coordX: %.2f coordY: %.2f", point.x, point.y); 
    if(CGRectContainsPoint(rect, point)) { 
        CCLOG(@"You touched in the rectSprite"); 
    } 
    return YES;  
} 

 

9、获取触摸的是哪个tile,并改变该tile.

CCSprite *rectSprite; 
CCTMXTiledMap *gameWorld; 
int speed = 10; 
-(id) init 
{ 
    // always call "super" init 
    // Apple recommends to re-assign "self" with the "super" return value 
    if( (self=[super init])) { 
        gameWorld = [CCTMXTiledMap tiledMapWithTMXFile:@"PositionText.tmx"]; 
        [self addChild:gameWorld]; 
        CGSize winSize = [[CCDirector sharedDirector] winSize]; 
        CCLOG(@"gameWorld.mapSize.width:%.2f  gameWorld.mapSize.height:%.2f",gameWorld.mapSize.width, gameWorld.mapSize.height); 
        CCLOG(@"gameWorld.tileSize.width: %.2f  gameWorld.tileSize.height:%.2f", gameWorld.tileSize.width, gameWorld.tileSize.height); 
        CCLOG(@"winSize.width:%.2f  winSize.height:%.2f", winSize.width, winSize.height); 
         
        CCSprite *pointSprite = [CCSprite spriteWithFile:@"point.png"]; 
        [gameWorld addChild:pointSprite z:2 tag:1]; 
        pointSprite.position = ccp(20,20); 
        pointSprite.anchorPoint = ccp(0.5, 0.5); 
         
         
        rectSprite = [CCSprite spriteWithFile:@"myrect.png"]; 
        [gameWorld addChild:rectSprite z:0 tag: 3]; 
        rectSprite.position = ccp(40, 40); 
        rectSprite.anchorPoint = ccp(0, 0); 
                 
        [self setIsTouchEnabled:YES]; 
    } 
    return self; 
} 
 
- (void) registerWithTouchDispatcher { 
    [[CCTouchDispatcher sharedDispatcher] addTargetedDelegate:self priority:INT_MIN + 1 swallowsTouches:YES]; 
} 
 
- (BOOL) ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event { 
    CGPoint point = [touch locationInView: [touch view]]; 
    point = [self convertTouchToNodeSpace: touch]; 
    CCLOG(@"CCNode2 coordX: %.2f coordY: %.2f", point.x, point.y); 
 
    CGPoint tilePos = [self tilePosition:point]; 
    if(tilePos.x == -1 || tilePos.y == -1) return NO; 
    CCTMXLayer *ly = [gameWorld layerNamed:@"Layer 0"]; 
    if([ly tileGIDAt:tilePos] != 3) { 
        [ly setTileGID:0 at: tilePos]; 
    } 
    return YES;  
} 
 
- (void) ccTouchMoved:(UITouch *)touch withEvent:(UIEvent*)event { 
     
} 
 
- (void) ccTouchEnded:(UITouch *)touch withEvent:(UIEvent*)event { 
     
} 
 
 
- (CGPoint) tilePosition:(CGPoint)pos { 
    CGPoint point; 
    CCTMXLayer *ly = [gameWorld layerNamed:@"Layer 0"]; 
    if(ly== nil) { 
        CCLOG(@"Error: Layer not found!"); 
        return ccp(-1, -1); 
    } 
    CGSize layerSize = [ly layerSize]; 
    CGSize tileSize = [gameWorld tileSize]; 
    int x = pos.x / tileSize.width; 
    int y = layerSize.height - pos.y / tileSize.height; 
    if((x >= 0) && (x < layerSize.width) && (y >= 0) && (y < layerSize.height)) { 
        point = ccp(x, y); 
    } else { 
        point = ccp(-1, -1); 
    } 
    if(point.x < 0) return ccp(-1, -1); 
    if(point.y < 0) return ccp(-1, -1); 
    if(point.x >= layerSize.width) return ccp(-1, -1); 
    if(point.y >= layerSize.height) return ccp(-1, -1); 
    CCLOG(@"%d, %d", x, y); 
    return point; 
} 

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