• Sources can be compiled (I used MonoDevelop)
• RunningExample.zip can be extracted and run with mono AutonomousAgent.exe

Implementation of some steering behavior using GNU/Linux, Monogame, and C# based on paper from Craig W. Reynolds.

Each ghost has a defined detection zone whose boundaries are described by the circle drawn around them. In other words they are only aware of events that occur in that area.

Ghosts are defined with a speed (linear and angular), some mass that allows to simulate entity inertia and a maximal speed or force that can be applied to them.

Each behavior can be added together to form more complex behavior. This is illustrated with the Flocking behavior.

You can navigate between scenes using N (next) and P (previous) keys. Scenes are organized using a FSM.

Seek: The Ghost follows the mouse cursor position.

Arrive: The Ghost follows the mouse cursor (like in Seek behavior) but slow down before arrival to avoid overstepping or going back and forth infinitely.

Flee: The Ghost flees the mouse cursor.

Wander: The ghost wanders aimlessly. In this behavior another debug circle is added. It is used to determine the direction to be followed by the entity while avoiding sudden changes.

Evade / Pursuit: One ghost try to avoid another one. The one who runs away try to go in the opposite direction of the opponent. The chaser try to anticipate the next position of the runner to intercept him. Evade and Pursuit represent more advanced version of Flee and Seek.

Flocking: This is the most complex scene. Each small ghost just wander aimlessly but still trying to avoid the bigger one. If you press G, they will pack together like fish swarm and start to act as a whole. This behavior is called flocking and is the result of the combination of Separation / Cohesion and Alignment behaviors. That is, they are at the same time rejected / attracted and try to all go in a common direction.

In a nutshell:

• press F to make each small ghost acts only for itself (Wander / Evade / Flee)
• press G to make them act as groups (Wander / Evade / Flee / Alignment / Cohesion / Separation)