Prevent body from rotating in Box2D

Question

I am currently using Box2d, more precisely the Java port jBox2d.

I have a circle that is colliding with other circles when falling (all those circles form a kind of a crank, see picture below).

Naturely, the circle begins to rotate when falling. But I would like to prevent it from rotating so that the friction is much higher.

Answer 1

To prevent body from rotating set fixedRotation = true at BodyDef or call setFixedRotation of Body (if you need run-time change behavior).

Answer 2

In the runtime you want to set set rotationfixed then

b2Body body;  
body->SetFixedRotation(true);