Reactors

A "Reactor" is typically an object (instance of a class) to handle changes across all its points. A few free reactors exist

Gravity Reactor

The gravity reactor adds 2D motion in a direction Apply many points to the reactor, and step every frame:

    gr = new GravityReactor(gravityPoint, points)
    gr.step()

Note: this isn't a mass reactor (where points tend towards each other)

Velocity Reactor

The velocity addon supplies classes and methods for speed and Vector based motion.

A Vector is very similar to a Point, but is referenced within a point through vx, vy

Rope Reactor

The rope provides constraints through vertlet chain solutions.