cocos2d for iPhone

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

1. 

   stuffradio
   Member

   I know there have been posts about this, and I already read them. I don't think they apply to my situation though.

   What I want, is to have a rectangle, this rectangle will be what I call a hitbox. While your fingers are touching and moving in the hitbox, I want to be able to replace the current color within the box to that of another color or texture. Does anyone have any ideas for me? Another solution to this, is maybe I can just put a picture of the whole texture, and then overlay the box with a color or something.

   Which one is easiest on memory?

   Posted 2 years ago #
2. 

   mobilebros
   Moderator

   I would personally create my own CocosNode and override the draw method. In the draw method I would just use OpenGL directly to draw shapes and color them accordingly. It's somewhat easy to do, heres what I do for one of my classes in spacemanager:

   http://code.google.com/p/chipmunk-spacemanager/source/browse/trunk/src/cpShapeNode.m

   This class knows how to draw a few kinds of shapes, but its dependent on chipmunk and spacemanager, if you just delete all that stuff you should be able to adapt it.

   Posted 2 years ago #
3. 

   michaelm
   Member

   Just use two different sprites. One rectangle sprite colored one way, the other colored the other.

   Load the textures and save a variable to them. Then touch on, set the texture to one, touch off replace texture with other
   

   Texture2d* buttonOn = [[TextureMgr sharedTextureMgr] addImage:@"r1.png"];
   Texture2d* buttonOff = [[TextureMgr sharedTextureMgr] addImage:@"r2.png"];
   Sprite* buttonSprite =	[[Sprite alloc] initWithTexture:buttonOff];
   
   then
   buttonSprite.texture = buttonOff;

   Unless your sprites are large I wouldn't worry about the memory, because texturemanager will load them only once.

   Posted 2 years ago #
4. 

   mobilebros
   Moderator

   Oh I forgot, you can also "tint" sprites now. Theres a TintTo and TintBy or you can just call setColor directly on the Sprite. If you just have a white sprite to start out with (I think its white anyway) then you'll be able to achieve just about any color.

   Posted 2 years ago #
5. 

   stuffradio
   Member

   Thanks for the answers, I'll try different things you guys said.

   @mobilebros I'm trying to find a driveway or road art and put a blanket of snow on it.

   Another thing I was thinking, what if I used a tilemap... and when your finger touches certain tiles... then it paints. Would that be easy and a good way to do it too? I think it probably would be easiest for building levels.

   Posted 2 years ago #

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