keepaway.java

MASON代表多主体邻里或网络仿真(Multi-Agent Simulator of Neighborhoods or Networks)。它是乔治梅森大学用Java开发的离散事件多主体仿真核心库

package sim.app.keepaway;
import java.awt.*;
import sim.engine.*;
import sim.field.continuous.*;
import ec.util.*;
import sim.util.*;
import java.io.*;

public /*strictfp*/ class Keepaway extends SimState
    {
    /** @todo handle realocation of grids when these two are changed */
    public double xMin = 0;
    public double xMax = 100;
    public double yMin = 0;
    public double yMax = 100;
    
    public Continuous2D fieldEnvironment;
    

    /** Creates a Keepaway simulation with the given random number seed. */
    public Keepaway(long seed)
        {
        this(seed, 100, 100);
        }
        
    public Keepaway(long seed, int width, int height)
        {
        super(new MersenneTwisterFast(seed), new Schedule(2));
        xMax = width; yMax = height;
        createGrids();
        }

    void createGrids()
        {       
        fieldEnvironment = new Continuous2D(25, (xMax - xMin), (yMax - yMin));
        }
    
    /** Resets and starts a simulation */
    public void start()
        {
        super.start();  // clear out the schedule
        createGrids();

        Bot b;
        Vector2D loc = new Vector2D(0, 0);
        
        // bot 1-1  
        loc.x = random.nextDouble()*xMax;
        loc.y = random.nextDouble()*yMax;
        b = new Bot(loc.x, loc.y, Color.red);
        b.cap = 0.65;
        fieldEnvironment.setObjectLocation(b, new Double2D(loc.x, loc.y));
        schedule.scheduleRepeating(b);
        
        // bot 2-1   
        loc.x = random.nextDouble()*xMax;
        loc.y = random.nextDouble()*yMax;
        b = new Bot(loc.x, loc.y, Color.blue);
        b.cap = 0.5;
        fieldEnvironment.setObjectLocation(b, new Double2D(loc.x, loc.y));
        schedule.scheduleRepeating(b);
        
        
        // bot 2-2  
        loc.x = random.nextDouble()*xMax;
        loc.y = random.nextDouble()*yMax;
        b = new Bot(loc.x, loc.y, Color.blue);
        b.cap = 0.5;
        fieldEnvironment.setObjectLocation(b, new Double2D(loc.x, loc.y));
        schedule.scheduleRepeating(b);
        
        // bot 2-3  
        loc.x = random.nextDouble()*xMax;
        loc.y = random.nextDouble()*yMax;
        b = new Bot(loc.x, loc.y, Color.blue);
        b.cap = 0.5;
        fieldEnvironment.setObjectLocation(b, new Double2D(loc.x, loc.y));
        schedule.scheduleRepeating(b);
        
        // ball
        Ball ba;
        loc.x = random.nextDouble()*xMax;
        loc.y = random.nextDouble()*yMax;
        ba = new Ball(loc.x, loc.y);
        fieldEnvironment.setObjectLocation(ba, new Double2D(loc.x, loc.y));
        schedule.scheduleRepeating(ba);
        }

    public static void main(String[] args)
        {
        doLoop(Keepaway.class, args);
        System.exit(0);
        }    

    
    }