cocos2d for iPhone

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

1. 

   mrTortex
   Member

   Hello.

   I've read/watched what I can find about the parallax node, but it all seems t be using sprite sheets. My need is much simpler, so may not need the parallax node at all.

   Basically, I want to move 2-3 layers of sprites depending upon where a Chipmunk shape is in a window. If the shape moves 50 pixels to the left, the layers move 50 +x amount. I've read about the camera, this may do what I need, but again may be too complex.

   I come from Flash, so would have done this in AS3 with a simple background.x = foreground.x +/- x amount, possibly using a tween to keep it smooth. Is this the way to go in Cocos, or should I look elsewhere?

   Thanks. :)

   Posted 1 year ago #
2. 

   gargantuan
   Member

   The way I usually do this is to subclass CCLayer and call it ParalaxLayer, which has a paralax ratio property. I then overwrite the setPosition method and multiply the ccp(x,y) values by the paralax ratio.

   So if you set the paralax ratio to 0.5 for example, that layer will move less than a layer with a paralax ratio of 1.

   Make sense?

   Posted 1 year ago #
3. 

   mrTortex
   Member

   Yes, but no! Any chance of a simplified piece of code?

   Posted 1 year ago #
4. 

   gargantuan
   Member

   setPosition:(CGPoint)position
   {
       paralaxPosition = ccp(position.x * paralaxRation, position.y * paralaxRatio);
       [super setPosition:paralaxPositon];
   }

   Posted 1 year ago #
5. 

   mrTortex
   Member

   Hello.

   Thanks. :) I get how this works now, I just can't see how to implement it. Do you call this in your init method on the layers you wish to apply parallax to?

   I think I need to read some more :)

   Thanks for your help.

   Posted 1 year ago #
6. 

   gargantuan
   Member

   You should probably set the paralaxRatio to 1 in your init method so you have a default setting. Then maybe create a method like

   initParalaxLayerWithRatio:(float)pRatio;

   you then just add stuff to that layer with addChild, or subclass it if you need something more complex.

   Then just call setPosition on it as you would normally and everything should just work.

   -t

   Posted 1 year ago #

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