Chipmunk Physics

I want to make a body to jump, but apply_force makes it act weird (it never slows down).

Is there a "proper way" to make the body jump? Or did I do the force applying wrong?

Try applying an impulse instead.

Forces act continuously until you reset them. Impulses modify the object's velocity immediately. Impulses are a much better way to implement things like jumping or guns firing.

Ok thanks.

ok evrything is fine but what is r (some offset or what) and j (some vector of what ?) ?

Yeah, it's the shorthand used in all the physics equations. Someday I'll refactor all the naming to make it more clear. I swear

j is the impulse expressed as a vector in absolute coordinates. r is the offset from the center of gravity of the body, also expressed in absolute coordinates.