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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.flockers;
import sim.engine.*;
import sim.display.*;
import sim.portrayal.continuous.*;
import javax.swing.*;
import java.awt.*;
import sim.portrayal.simple.*;
import sim.portrayal.SimplePortrayal2D;

public class FlockersWithUI extends GUIState
    {
    public Display2D display;
    public JFrame displayFrame;

    public static void main(String[] args)
        {
        new FlockersWithUI().createController();  // randomizes by currentTimeMillis
        }

    public Object getSimulationInspectedObject() { return state; }  // non-volatile

    ContinuousPortrayal2D flockersPortrayal = new ContinuousPortrayal2D();
        
// uncomment this to try out trails  (also need to uncomment out some others in this file, look around)
    ContinuousPortrayal2D trailsPortrayal = new ContinuousPortrayal2D(); 
    
    public FlockersWithUI()
        {
        super(new Flockers(System.currentTimeMillis()));
        }
    
    public FlockersWithUI(SimState state) 
        {
        super(state);
        }

    public static String getName() { return "Flockers"; }

    public void start()
        {
        super.start();
        setupPortrayals();
        }

    public void load(SimState state)
        {
        super.load(state);
        setupPortrayals();
        }
        
    public void setupPortrayals()
        {
        Flockers flock = (Flockers)state;

        flockersPortrayal.setField(flock.flockers);
        // uncomment this to try out trails  (also need to uncomment out some others in this file, look around)
        trailsPortrayal.setField(flock.flockers);
        
        // make the flockers random colors and four times their normal size (prettier)
        for(int x=0;x h)
            { display.insideDisplay.width = 750; display.insideDisplay.height = 750 * (h/w); }
        else if (w < h)
            { display.insideDisplay.height = 750; display.insideDisplay.width = 750 * (w/h); }
            
        // reschedule the displayer
        display.reset();
                
        // redraw the display
        display.repaint();
        }

    public void init(Controller c)
        {
        super.init(c);

        // make the displayer
        display = new Display2D(750,750,this);
        display.setBackdrop(Color.black);


        displayFrame = display.createFrame();
        displayFrame.setTitle("Flockers");
        c.registerFrame(displayFrame);   // register the frame so it appears in the "Display" list
        displayFrame.setVisible(true);
// uncomment this to try out trails  (also need to uncomment out some others in this file, look around)
        display.attach( trailsPortrayal, "Trails" );
                
        display.attach( flockersPortrayal, "Behold the Flock!" );
        }
        
    public void quit()
        {
        super.quit();
        
        if (displayFrame!=null) displayFrame.dispose();
        displayFrame = null;
        display = null;
        }
    }