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MASON is a fast discrete-event multiagent simulation library core in Java, designed to be the foundation for large custom-purpose Java simulations, and also to provide more than enough functionality for many lightweight simulation needs. MASON contains both a model library and an optional suite of visualization tools in 2D and 3D.

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/*
  Copyright 2006 by Sean Luke and George Mason University
  Licensed under the Academic Free License version 3.0
  See the file "LICENSE" for more information
*/

package sim.app.swarmgame;
import sim.engine.*;
import sim.util.*;
import sim.field.continuous.*;

public class SwarmGame extends SimState
    {
    private static final long serialVersionUID = 1;

    public Continuous2D agents;
    public double width = 100;
    public double height = 100;
    public int numAgents = 100;
    public double jump = 0.5;  // how far do we move in a timestep?
    
    public double stalker_v = 0.5;
    public double avoider_v = 0.5;
    public double defender_v = 0.0;
    public double aggressor_v = 0.0;
    public double random_v = 0.0;
    
    // some properties to appear in the inspector
    public double getGoTowardsA() { return stalker_v; }
    public void setGoTowardsA(double val) { stalker_v = val; }
    public double getGoAwayFromB() { return avoider_v; }
    public void setGoAwayFromB(double val) { avoider_v = val; }
    public double getGoBetweenAAndB() { return defender_v; }
    public void setGoBetweenAAndB(double val) { defender_v = val; }
    public double getGetBehindBFromA() { return aggressor_v; }
    public void setGetBehindBFromA(double val) { aggressor_v = val; }
    public double getMoveRandomly() { return random_v; }
    public void setMoveRandomly(double val) { random_v = val; }

    /** Creates a SwarmGame simulation with the given random number seed. */
    public SwarmGame(long seed)
        {
        super(seed);
        }
    
    public void start()
        {
        super.start();
        
        // set up the agents field
        agents = new Continuous2D(width,width,height);
        
        // make a bunch of agents and schedule 'em
        for(int x=0;x