gov/nasa/worldwind/geom/SurfacePolygon.java

   1 /*
   2 Copyright (C) 2001, 2006 United States Government
   3 as represented by the Administrator of the
   4 National Aeronautics and Space Administration.
   5 All Rights Reserved.
   6 */
   7 package gov.nasa.worldwind.geom;
   8
   9 import java.awt.*;
  10 import java.awt.geom.*;
  11 import java.awt.image.*;
  12 import java.util.*;
  13
  14 /**
  15  * @author tag
  16  * @version $Id: SurfacePolygon.java 1688 2007-05-02 22:03:39Z tgaskins $
  17  */
  18 public class SurfacePolygon extends SurfaceShape
  19 {
  20
  21     public SurfacePolygon(Iterable<LatLon> positions, Color color, Color borderColor)
  22     {
  23         super(positions, color, borderColor);
  24     }
  25
  26     public SurfacePolygon(Iterable<LatLon> positions)
  27     {
  28         super(positions, null, null);
  29     }
  30
  31     protected final BufferedImage drawShape(BufferedImage image)
  32     {
  33         double minLat = this.getSector().getMinLatitude().getDegrees();
  34         double minLon = this.getSector().getMinLongitude().getDegrees();
  35         double dLat = this.getSector().getDeltaLatDegrees();
  36         double dLon = this.getSector().getDeltaLonDegrees();
  37
  38         double latScale = dLat > 0 ? image.getHeight() / dLat : 0;
  39         double lonScale = dLon > 0 ? image.getWidth() / dLon : 0;
  40
  41         GeneralPath path = new GeneralPath();
  42
  43         Iterator<LatLon> positions = this.getPositions().iterator();
  44         if (!positions.hasNext())
  45             return image;
  46
  47         LatLon pos = positions.next();
  48         path.moveTo(
  49             (float) Math.min(lonScale * (pos.getLongitude().getDegrees() - minLon), image.getWidth() - 1),
  50             (float) Math.min(latScale * (pos.getLatitude().getDegrees() - minLat), image.getHeight() - 1));
  51
  52         double delta = 1d / this.getNumEdgeIntervals();
  53         while (positions.hasNext())
  54         {
  55             LatLon posNext = positions.next();
  56             for (int i = 0; i < this.getNumEdgeIntervals(); i++)
  57             {
  58                 LatLon p = LatLon.interpolate(i * delta, pos, posNext);
  59                 path.lineTo(
  60                     (float) Math.min(lonScale * (p.getLongitude().getDegrees() - minLon), image.getWidth() - 1),
  61                     (float) Math.min(latScale * (p.getLatitude().getDegrees() - minLat), image.getHeight() - 1));
  62             }
  63
  64             // Set the last point directly to terminate any round-off error in the iteration above.
  65             path.lineTo(
  66                 (float) Math.min(lonScale * (posNext.getLongitude().getDegrees() - minLon), image.getWidth() - 1),
  67                 (float) Math.min(latScale * (posNext.getLatitude().getDegrees() - minLat), image.getHeight() - 1));
  68
  69             pos = posNext;
  70         }
  71
  72         Graphics2D g2 = image.createGraphics();
  73
  74         if (this.isAntiAlias())
  75             g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
  76
  77         if (this.isDrawInterior())
  78         {
  79             g2.setPaint(this.getPaint());
  80             g2.fill(path);
  81         }
  82
  83         if (this.isDrawBorder())
  84         {
  85             g2.setPaint(this.getBorderColor());
  86             g2.setStroke(this.getStroke());
  87             g2.draw(path);
  88         }
  89
  90         return image;
  91     }
  92 }