Applies simplified gravity between every pair of bodies.
Specifies the strength of the gravitation force.
If true, gravity is proportional to r^-2, otherwise r^-1.
Body count.
List of bodies.
Adds a body to the controller.
Body to add.
Removes all bodies from the controller.
Debug drawing.
Handle to drawer.
Gets the body list.
Body list.
Gets the next controller.
Next controller.
Gets the world.
World.
Removes a body from the controller.
Body to remove from this controller.