Spining object

[arny]

hello im starting out using chipmunk which is a awesome library. But im having some trouble coming up with how i would go about making a body spin that cant move on the Y axis, the body would be anchor to the bottom of the screen and would spin on the x axis. I have tried cpBodySetForce and applyForce on the y axis, and messing around with gravity values with no luck.
-thanks

[slembcke]

You want a groove joint between the body and a static body. It allows a pivot on one of the bodies to move along a grove on the other. You can use that to force it to keep it's y value.

[arny]

ok cool so i got it to spin perfectly using this code it will constantly spin. What i see i failed to mention in my first post is that the object is going to spin based off gestures from the user.
-thanks

Code: Select all

    cpBody* staticBody = cpBodyNewStatic();
    cpBodySetPos(staticBody, ccp(0, 10));
    
    
    cpSpaceAddConstraint(space_, cpGrooveJointNew(staticBody, player.body, ccp(0, 10), ccp(0, 0), cpvzero));