cocos2d for iPhone

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

1. 

   byron
   Member

   i am new to using chipmunk and cocos2d and so far i have created shapes and bodies flying over the screen and colliding

   I have been trying to create a stationary turret (rotates only) which is make up of different sprites (weapon, body etc) that change when upgraded but i am confused as to what route to take in creating the turret..

   I have managed to create the turret with collision detection but as a single body and shape, i have tried adding new shapes to the same body and tried updating the sprite to a different weapon type but i dont know where im going wrong.

   I shall continue trying in the morning but if anyone can point me in the right direction as to how to change the sprite associated with a shape it would be helpful..

   Thanks
   By

   Posted 1 year ago #
2. 

   zenkimoto
   Member

   @byron

   If I'm understanding you correctly, you want to create a turret where the weapon rotates and the body is stationary. In order to do this, you need more than one cpbody. Multiple shapes and one cpbody acts as one object. I think you what you need to do is to create a cpbody for the weapon and a cpbody for the turret. However, the two objects might create a collision event. Your best bet maybe a joint between the two objects.

   http://code.google.com/p/chipmunk-physics/wiki/cpConstraint

   Hope this helps.

   Posted 1 year ago #
3. 

   byron
   Member

   thanks for the help, i have created the turrets body( which is circular) and it rotates on a fixed pivot joint but when i try to add a weapon to the edge of the turret the joint caused it to rotate on the edge, i cant seem to find a joint that will keep it fixed? and i cant seem to update the look of the weapon either..

   I have tryed updating the shapes data with a new sprite but it doesnt update..

   Posted 1 year ago #
4. 

   randomtruth
   Member

   set the density of the weapon to zero.
   bodydef.density = 0;

   Posted 1 year ago #
5. 

   byron
   Member

   i dont understand cpBody doesnt have a density?

   Posted 1 year ago #
6. 

   mobilebros
   Moderator

   density is in Box2d so that doesn't apply here.

   You say you have a problem with the joints not keeping it fixed. Try two pivot joints spaced some distance apart, that should hold it in place.

   Posted 1 year ago #

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