直角瓦片地图坐标转换算法记录(OC)

瓦片地图

-(void) ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    CCNode* node = [self getChildByTag:TileMapNode];
    CCTMXTiledMap* tileMap = (CCTMXTiledMap*)node;

    // 将屏幕位置转换为瓦片坐标
    CGPoint touchLocation = [self locationFromTouch:[touches anyObject]];
    CGPoint tilePos = [self tilePosFromLocation:touchLocation tileMap:tileMap];
｝

//点击的位置
-(CGPoint) locationFromTouch:(UITouch*)touch
{
    CGPoint touchLocation = [touch locationInView: [touch view]];
    return [[CCDirector sharedDirector] convertToGL:touchLocation];
}

//location:点击的位置  tileMap:地图
-(CGPoint) tilePosFromLocation:(CGPoint)location tileMap:(CCTMXTiledMap*)tileMap
{
    //点击的位置＋地图的坐标（偏移量）
    CGPoint pos = ccpSub(location, tileMap.position);

    //缩放的大小（屏幕外，未滚动）
    float scaledWidth = tileMap.tileSize.width / CC_CONTENT_SCALE_FACTOR();
    float scaledHeight = tileMap.tileSize.height / CC_CONTENT_SCALE_FACTOR();

    //地图的坐标
    pos.x = (int)(pos.x / scaledWidth);
    pos.y = (int)((tileMap.mapSize.height * tileMap.tileSize.height - pos.y) / scaledHeight);

    return pos;
}

convertToGL考虑到当前场景的SCALE因子