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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 sim.engine.*;
import sim.field.grid.*;

public class LightCycles extends SimState
    {
    private static final long serialVersionUID = 1;

    public int gridHeight;
    public int gridWidth;
    public int cycleCount;
    
    // The intGrid holds the walls drawn behind the cycles...
    public IntGrid2D grid;
    // while the sparsegrid holds the cycles themselves.
    public SparseGrid2D cycleGrid;

    /** Creates a LightCycles simulation with the given random number seed. */
    public LightCycles(long seed)
        {
        this(seed, 100, 100, 10);
        }
        
    public LightCycles(long seed, int width, int height, int count)
        {
        super(seed);
        gridWidth = width; gridHeight = height; cycleCount = count;
        createGrids();
        }

    protected void createGrids()
        {
        grid = new IntGrid2D(gridWidth, gridHeight,0);
        cycleGrid = new SparseGrid2D(gridWidth, gridHeight);
        }
    
    /** Resets and starts a simulation */
    public void start()
        {
        super.start();  // clear out the schedule
        
        // make new grids
        createGrids();

        // Create the cycles, add to both grid and schedule
        for(int x=0;x