public void step(SimState state) {
Students students = (Students) state;
Continuous2D yard = students.yard;
Double2D me = students.yard.getObjectLocation(this);
MutableDouble2D sumForces = new MutableDouble2D();
// add in a vector to the "teacher" -- the center of the yard, so we don't go too far away
sumForces.addIn(
new Double2D(
(yard.width * 0.5 - me.x) * students.forceToSchoolMultiplier,
(yard.height * 0.5 - me.y) * students.forceToSchoolMultiplier));
// add a bit of randomness
sumForces.addIn(
new Double2D(
students.randomMultiplier * (students.random.nextDouble() * 1.0 - 0.5),
students.randomMultiplier * (students.random.nextDouble() * 1.0 - 0.5)));
sumForces.addIn(me);
students.yard.setObjectLocation(this, new Double2D(sumForces));
}
