cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   javy
   Member

   I have an AtlasSpriteManager as a property of an custom object.

   In the manager I have two AtlasSprites (one of a button unpressed, and another pressed down). In their instantiation I set their initial position like so:

   // in the init
   withPosition:CGPointMake(50.0, 100.0)

   // elsewhere, in the init method
   sprite.position = newPosition; // the point specified above

   I then add the manager as a child of a layer, to be added to a scene, then displayed.
   [self addChild:testButton.spriteManager z:0 tag:kTagSpriteManager];

   I then run it in the simulator...

   The first sprite is at the proper position. However, the second appears to have it's x position off by -50, and the y position correct.

   The position property in the sprite manager is never changed, nor are the anchor points. Only the position properties of the sprites are adjusted.

   When displaying the x/y positions with nslog, the points are 50.0, 100.0 as specified.

   Any insight as to what I'm doing wrong?

   Posted 2 years ago #
2. 

   GemNg
   Member

   What are their anchor point?

   Posted 2 years ago #
3. 

   yokemura
   Member

   I have encountered the same problem.

   I'm developing a very simple boxing-like game, and as a much simpler test
   I tried putting 2 sprites from a .png file in which two images are connected horizontally.
   (The image of player #1 to the left, the one of player #2 to the right)

   The player#1's position seems to be correct
   but player#2 seems to shift horizontally by the length of half size of the sprite.

   I've set the anchor point of both to (0.5, 0.5) implicitly but it remains shifted.
   Somehow setting the anchor of player#2 to (0.25, 0.5) I've got my desired result. ...why???

   Posted 2 years ago #
4. 

   javy
   Member

   Ahhh...this was solved by someone else in another thread a while back. Seems when I was extracting the sprite from the sprite sheet I was doing it wrong.

   AtlasSprite *tempSprite = [AtlasSprite spriteWithRect:CGRectMake(0, 0, 48, 52) spriteManager:tempManager];

   In the example above, 0,0 is the starting positions on the sprite sheet, and the next two numbers are the size of the sprite.

   If the next sprite is the same size, but to the right on the sheet, you would do this:

   AtlasSprite *nextSprite = [AtlasSprite spriteWithRect:CGRectMake(48, 0, 48, 52) spriteManager:tempManager];

   I made the mistake of changing the second pair of values, thinking I needed to offset them based on the sprite position.

   Sounds like you're doing what I did, which ended up cutting off half of the sprite.

   Good luck.

   Posted 2 years ago #
5. 

   yokemura
   Member

   Ooohh!
   That explains it!

   Thanks a lot, Javy!!

   Posted 2 years ago #

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