hexavaluegridportrayal2d.java

MASON代表多主体邻里或网络仿真(Multi-Agent Simulator of Neighborhoods or Networks)。它是乔治梅森大学用Java开发的离散事件多主体仿真核心库

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);

        int argb;

        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<endy;y++)
            for(int x=startx;x<endx;x++)
                {
                getxyC( x, y, xScale, yScale, info.draw.x, info.draw.y, xyC );
                getxyC( field.ulx(x,y), field.uly(x,y), xScale, yScale, info.draw.x, info.draw.y, xyC_ul );
                getxyC( field.upx(x,y), field.upy(x,y), xScale, yScale, info.draw.x, info.draw.y, xyC_up );
                getxyC( field.urx(x,y), field.ury(x,y), xScale, yScale, info.draw.x, info.draw.y, xyC_ur );

                xPoints[0] = (int)(xyC_ur[0]-0.5*xScale);
                yPoints[0] = (int)(xyC_ur[1]+yScale);
                xPoints[1] = (int)(xyC_up[0]+0.5*xScale);
                yPoints[1] = (int)(xyC_up[1]+yScale);
                xPoints[2] = (int)(xyC_up[0]-0.5*xScale);
                yPoints[2] = (int)(xyC_up[1]+yScale);
                xPoints[3] = (int)(xyC_ul[0]+0.5*xScale);
                yPoints[3] = (int)(xyC_ul[1]+yScale);
                xPoints[4] = (int)(xyC[0]-0.5*xScale);
                yPoints[4] = (int)(xyC[1]+yScale);
                xPoints[5] = (int)(xyC[0]+0.5*xScale);
                yPoints[5] = (int)(xyC[1]+yScale);
                    
                if (graphics == null)
                    {
                    generalPath.reset();
                    generalPath.moveTo( xPoints[0], yPoints[0] );
                    for( int i = 1 ; i < 6 ; i++ )
                        generalPath.lineTo( xPoints[i], yPoints[i] );
                    generalPath.closePath();
                    Area area = new Area( generalPath );
                    if( area.intersects( info.clip.x, info.clip.y, info.clip.width, info.clip.height ) )
                        {
                        valueToPass.val = isDoubleGrid2D ?  doubleField[x][y] : intField[x][y];
                        putInHere.add( getWrapper(valueToPass.val, x, y) );
                        }
                    }
                else
                    {
                    Color c = map.getColor(isDoubleGrid2D ?  doubleField[x][y] : intField[x][y]);
                    if (c.getAlpha() == 0) continue;
                    graphics.setColor(c);
                    
                    // MacOS X 10.3 Panther has a bug which resets the clip, YUCK
                    //                    graphics.setClip(clip);
                    graphics.fillPolygon(xPoints,yPoints,6);
                    }
                }
        
        }

    GeneralPath generalPath = new GeneralPath();
    }