Define map bounds and center on player node?

Question

I\'m working on a sidescroller with Spritekit and Swift. I don\'t understand how to define a playable area bigger than the screen and center the camera on the player. How ca

Answer 1

I followed Ray Wenderlich's tutorial on a side scrolling game Super Koalio (or something like that). That game is a side scroller where the game map is larger sideways than the screen. The following code is for my game which is a vertical scrolling game.

In the update method I call a method called setViewPointCenter.

-(void)update:(CFTimeInterval)currentTime
  {
    // Other things are called too
    [self setViewPointCenter:self.player.position];
  }

Then in that method you just update the view

- (void)setViewPointCenter:(CGPoint)position
{
  NSInteger x = MAX(position.x, self.size.width / 2);
  NSInteger y = MAX(position.y, self.size.height /2);
  x = MIN(x, (self.map.mapSize.width * self.map.tileSize.width) - self.size.width / 2);
  y = MIN(y, (self.map.mapSize.height * self.map.tileSize.height) - self.size.height / 2);
  CGPoint actualPostion = CGPointMake(x, y);
  CGPoint centerOfView = CGPointMake(self.size.width/2, self.size.height/2);
  CGPoint viewPoint = CGPointSubtract(centerOfView, actualPostion);
  self.map.position = viewPoint;
}

Now my character is always in the center of the screen. I did change some items from horizontal to vertical, but at least you get an idea. Also, I used a tile map that is why you see mapSize and tileSize. You might want to take a look at Ray's tutorial. And of course you will need to convert into the methods into Swift!!