cocos2d for iPhone

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

1. 

   roli
   Member

   I have a question - again. I have a field of sprites thal looks like this:
   xxx
   xxx
   xxx
   xxx

   The question is how can I move all those sprites at one time. And when the first line dissapears from the screen (on top), I want to display it again on the bottom of the screen. So what is the best way of doing this?

   Posted 2 years ago #
2. 

   bradparks
   Member

   you could add your sprites to a parent node, and move the parent node instead.... if you're using AtlasSprites, I think you can move the AtlasSpriteManager itself, so it's kind of an automatic parent of any AtlasSprites...

   e.g.

   instead of

   [scene addChild:sprite1];
   [scene addChild:sprite2];

   you'd basically do:

   CocosNode *allSpritesParent = [CocosNode node];
   [allSprites addChild:sprite1];
   [allSprites addChild:sprite2];
   
   [scene addChild:allSprites];

   Posted 2 years ago #
3. 

   roli
   Member

   Hmmm I don't know if this will work. Well it does work for moving the sprites but I can't get the sprites to register the touch. If I touch the sprites start position it works but if I touch the sprite after I moved it the thing doesn't do anything.

   I get the position of the sprite with:
   

   CGSize size = [[sprites getChildByTag:5] contentSize];
   CGPoint position = [[sprites getChildByTag:5] position];

   So I get the position like this and then simply check if the touch is inside the sprites rect. But this probably doesn't work because the position of the sprite is relative to the node? If so, how can I get the real position?

   Posted 2 years ago #
4. 

   javy
   Member

   Yes, then you could move sprites individually inside the node or manager if you wanted to as well. I've been playing with that lately and it's quite easy.

   Posted 2 years ago #
5. 

   javy
   Member

   I would recommend you search the forum for more info about when a touch is detected on a sprite - lots of good stuff here.

   Consider making a rect with the sprites position and comparing that to the touch.

   It will take some time to go through the code samples and documentation to figure it all out, but it will be worth it in the end.

   Posted 2 years ago #
6. 

   roli
   Member

   Well I found the method I needed:
   - (CGPoint) convertToWorldSpace:

   As for the touches. I am making a rect around the sprite and then simply look if the touch was inside that rect.

   Posted 2 years ago #
7. 

   roli
   Member

   Well I still have some problems with moving the group. So I move the sprites up to location like 0,480 (off screen). Then problem is that I don't know how to move the sprites from the bottom up. I tryed moving the group to the bottom with:

   [MoveTo actionWithDuration:0 position:ccp(320,0)]

   and then moving them (the group of sprites) back to 0,0 with another action. Problem is that the group moves back down from the top and not from the bottom up.

   EDIT: I was trying to get the group to move from bottom of the screen to the top but still no luck. So how could I reset the position to somewhere on the bottom of the screen and then move the group up?

   Posted 2 years ago #
8. 

   Codemattic
   Moderator

   Maybe dont use actions! Send a tick message to each sprite every frame - and in your tick method you move the sprite up a little, check if its above a certain threshold, and if so change its y value to be at the bottom of the screen.

   Posted 2 years ago #
9. 

   roli
   Member

   I can't belive I am such an idiot! Thanks for that! I simply used the setPosition method to move the group under the LCD and then used an action to move the group back up.

   Posted 2 years ago #

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