I have been doing some more work on my 2D game AI library and created this applet to test some of the steering behaviours, in particular flocking and wander.

In this demonstration applet you can vary all the variables that control the steering behaviours.

Flocking is created by the interaction of 3 steering behaviours alignment, cohesion and separation. The wander behaviour is added to get things moving accrosss the display.

The display shows the effect on 200 boids.

The wander and flocking algorithms used are based on the work of Craig Reynolds.