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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.portrayal.grid;
import sim.portrayal.*;
import sim.field.grid.*;
import java.awt.*;
import java.awt.geom.*;
import sim.util.*;

/**
   Portrayal for hexagonal grids (each cell has six equally-distanced neighbors) with double-precision real values.
*/

public class HexaValueGridPortrayal2D extends ValueGridPortrayal2D
    {
    int[] xPoints = new int[6];
    int[] yPoints = new int[6];

    double[] xyC = new double[2];
    double[] xyC_ul = new double[2];
    double[] xyC_up = new double[2];
    double[] xyC_ur = new double[2];
    
    public HexaValueGridPortrayal2D()
        {
        super();
        }

    public HexaValueGridPortrayal2D(String valueName)
        {
        super(valueName);
        }

    final static void getxyC( final int x, final int y, final double xScale, final double yScale, final double tx, final double ty, final double[] xyC )
        {
        xyC[0] = tx + xScale * (1.5 * x + 1);
        xyC[1] = ty + yScale * (1.0 + 2.0 * y + (x<0?(-x)%2:x%2) );
        }

    // our object to pass to the portrayal
    final MutableDouble valueToPass = new MutableDouble(0);

    protected void hitOrDraw(Graphics2D graphics, DrawInfo2D info, Bag putInHere)
        {
        final Grid2D field = (Grid2D)(this.field);
        if (field==null) return;
        
        // first question: determine the range in which we need to draw.
        final int maxX = field.getWidth();
        final int maxY = field.getHeight();
        if (maxX == 0 || maxY == 0) return;

        final double divideByX = ((maxX%2==0)?(3.0*maxX/2.0+0.5):(3.0*maxX/2.0+2.0));
        final double divideByY = (1.0+2.0*maxY);

        final double xScale = info.draw.width / divideByX;
        final double yScale = info.draw.height / divideByY;
        int startx = (int)(((info.clip.x - info.draw.x)/xScale-0.5)/1.5)-2;
        int starty = (int)((info.clip.y - info.draw.y)/(yScale*2.0))-2;
        int endx = /*startx +*/ (int)(((info.clip.x - info.draw.x + info.clip.width)/xScale-0.5)/1.5) + 4;  // with rounding, width be as much as 1 off
        int endy = /*starty +*/ (int)((info.clip.y - info.draw.y + info.clip.height)/(yScale*2.0)) + 4;  // with rounding, height be as much as 1 off

        //
        //
        // CAUTION!
        //
        // At some point we should triple check the math for rounding such
        // that the margins are drawn properly
        //
        //
        
        // next we determine if this is a DoubleGrid2D or an IntGrid2D
        
//        final Rectangle clip = (graphics==null ? null : graphics.getClipBounds());

        final boolean isDoubleGrid2D = (field instanceof DoubleGrid2D);
        final double[][] doubleField = (isDoubleGrid2D ? ((DoubleGrid2D) field).field : null);
        final int[][] intField = (isDoubleGrid2D ? null : ((IntGrid2D) field).field);

        double xyC_x, xyC_y, xyC_ulx, xyC_uly, xyC_upx, xyC_upy, xyC_urx, xyC_ury, x0, y0, tx, ty;

        if( startx < 0 ) startx = 0;
        if( starty < 0 ) starty = 0;
        if (endx > maxX) endx = maxX;
        if (endy > maxY) endy = maxY;

        for(int y=starty;y