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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 Daniel Kuebrich
  Licensed under the Academic Free License version 3.0
  See the file "LICENSE" for more information
*/

package sim.app.lightcycles;
import java.awt.*;
import java.awt.event.*;
import sim.display.*;

// This class is accurately named ControlUI instead of controlGUI because instead of allowing
// a user to interact with the simulation through graphical widgets, it simply adds keyboard 
// control to the display window.  This allows the user to control a cycle during the simulation.

public class ControlUI
    {
    // references to sim with ui, sim state, and selected cycle instance
    LightCyclesWithUI lcui;
    LightCycles lc;
    Cycle c;
    
    // for changing color of user-controlled cycle
    sim.portrayal.grid.SparseGridPortrayal2D cyclePortrayal;
    
    public ControlUI( LightCyclesWithUI nlc, sim.portrayal.grid.SparseGridPortrayal2D ncp )
        {
        
        lcui = nlc;
        lc = (LightCycles)lcui.state;
        cyclePortrayal = ncp;
        
        // Allows the display to receive input focus
        lcui.display.insideDisplay.setRequestFocusEnabled(true);
        
        try
            {
            initListeners();
            }
        catch (Exception e)
            {
            e.printStackTrace();
            }
        }
    
    public void initListeners()
        {
        lcui.display.insideDisplay.addKeyListener( new KeyAdapter()
            {
            public void keyPressed( KeyEvent e )
                {
            
                // space = cycle the cycles
                if(e.getKeyCode() == KeyEvent.VK_SPACE)
                    {
                    for(int x=0;x