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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.display;
import java.applet.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

/** A simple class for creating Applets out of your simulations.  Due to security restrictions,
    certain things will not work, such as reading files (loading models) or writing files
    (producing movies etc.).
    
    You can check to see if you're running under an applet by testing the value of
    SimApplet.isApplet
*/
public class SimApplet extends Applet 
    {
    // some random static stuff to force Display2D and Console classes to load, as they have
    // some important properties to set
    static boolean b;
    static int i;
    static
        {
        b = Display2D.isMacOSX();
        i = Console.DEFAULT_WIDTH;
        }

    static boolean isApplet = false;
    public SimApplet() { isApplet = true; }
    
    public static boolean isApplet() { return isApplet; }
    
    public void init() 
        {
        String simClassName = getParameter("Simulation");
        String simHumanName = getParameter("Name");
        final JButton button = new JButton("Start " + simHumanName);
        setLayout(new BorderLayout());
        add(button, BorderLayout.CENTER);
        try
            {
            // load that class
            final Class simClass = Class.forName(simClassName, true, Thread.currentThread().getContextClassLoader());
            if (!(GUIState.class.isAssignableFrom(simClass)) && !simClass.equals(sim.display.Console.class))  // if it's not a GUIState or Console
                throw new Exception("Class is not a GUIState or the Console: " + simClass);
            button.addActionListener(new ActionListener()
                {
                public void actionPerformed(ActionEvent evt)
                    {
                    try
                        {
                        setupApplet(simClass);
                        }
                    catch (Exception e)
                        {
                        doException(button,e);
                        }
                    }
                });
            }
        catch (Exception e)
            {
            doException(button,e);
            }
        }
        
    void setupApplet(Class GUIStateClass) throws Exception  // yes, purposely capitalized
        {
        if (GUIStateClass.equals(Console.class))
            Console.main(new String[] {});
        else
            {
            GUIState state = (GUIState)(GUIStateClass.newInstance());
            /*
              Console c = new Console(state);
              c.setVisible(true);
            */
            state.createController();
            }
        }
    
    void doException(JComponent button, Exception e)
        {
        JTextArea text = new JTextArea();
        text.setText("" + e);
        JScrollPane scroll = new JScrollPane(text);
        if (button != null) remove(button);
        add(scroll,BorderLayout.CENTER);
        e.printStackTrace();        
        }
    }