Controller

The Controller is an object that controls motors, thrusters and others, which are connected to it. It is a useful part for vehicles, as it can be used to control the speed of the devices that propel it.

Its appearance consists of signs and buttons which let players control:
 * A Yellow Text Label displays the speed of one connected propulsion object, or part-spinning object like Motor.
 * Plus Button: Clicking on it will increase the connected object's speed.
 * Negative Button: Opposite to a plus button, clicking on it will decrease connected objects' speed.
 * Reverse Button: Inverts the current speed.
 * Full Stop Button: Clicking on it will set connected objects' speed into zero, which stops them from functioning.