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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.mousetraps;
import sim.engine.*;
import sim.display.*;
import sim.portrayal.grid.*;
import sim.util.gui.*;
import java.awt.*;
import javax.swing.*;

public class MouseTrapsWithUI extends GUIState
    {
    public Display2D display;
    public JFrame displayFrame;
        
    FastValueGridPortrayal2D trapPortrayal = new FastValueGridPortrayal2D("Traps");
        
    public static void main(String[] args)
        {
        new MouseTrapsWithUI().createController();
        }
        
    public MouseTrapsWithUI() { super(new MouseTraps(System.currentTimeMillis())); }
    public MouseTrapsWithUI(SimState state) { super(state); }
    public static String getName() { return "Mouse Traps"; }
        
    public void start()
        {
        super.start();
        // set up our portrayals
        setupPortrayals();
        }
        
    public void load(SimState state)
        {
        super.load(state);
        // we now have new grids.  Set up the portrayals to reflect that
        setupPortrayals();
        }
            
    // This is called by start() and by load() because they both had this code
    // so I didn't have to type it twice :-)
    public void setupPortrayals()
        {
        // tell the portrayals what to portray and how to portray them
        trapPortrayal.setField(((MouseTraps)state).trapStateGrid);
        ((SimpleColorMap)trapPortrayal.getMap()).setLevels(0,1,Color.black,Color.red);
                
        // reschedule the displayer
        display.reset();
                    
        // redraw the display
        display.repaint();
        }
        
    public void init(Controller c)
        {
        super.init(c);
            
        // Make the Display2D.  We'll have it display stuff later.
        display = new Display2D(400,400,this); // at 400x400, we've got 4x4 per array position
        displayFrame = display.createFrame();
        c.registerFrame(displayFrame);   // register the frame so it appears in the "Display" list
        displayFrame.setVisible(true);
        
        // attach the portrayals
        display.attach(trapPortrayal,"Traps");
        
        // specify the backdrop color  -- what gets painted behind the displays
        display.setBackdrop(Color.black);
        }
            
    public void quit()
        {
        super.quit();
            
        if (displayFrame!=null) displayFrame.dispose();
        displayFrame = null;  // let gc
        display = null;       // let gc
        }
    }