Mobility models for ad-hoc networks

Pursue model

The '+' simbol denotes the gravity center.
The '.' points are the reference locations of the nodes.
The "0" node is the target point, it is not animated.
Click with the mouse to move the target to this position. The other nodes will go for it.

public static Pos move_pursue(int node) {
    // let's the maximum step a node can do in the direction of the target is
    // one third of the distance
    Pos p=(Pos)loc.get(new Integer(node));
    double d=p.distance(target);
    if(d<15.0)d=15.0; // min movement (acceleration)
    if(d>50.0)d=50.0; // max movement
    int xi=(int)(Math.random()*d/3);
    int yi=(int)(Math.random()*d/3);
    if (p.isLeft(target)) xi+=p.x; else xi=p.x-xi;
    if (p.isUp(target)) yi+=p.y; else yi=p.y-yi;
return new Pos(xi,yi);
}

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Miguel Sanchez 1998