Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/PolygonDatasetProducer.java @ 820:8288f4a0d7e6

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Added more Javadoc. gnv-artifacts/trunk@906 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Mon, 12 Apr 2010 13:23:18 +0000
parents feae2f9d6c6f
children f953c9a559d8
rev   line source
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1 package de.intevation.gnv.raster;
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2
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3 import de.intevation.gnv.jfreechart.CompactXYItems;
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4 import de.intevation.gnv.jfreechart.PolygonDataset;
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5 import de.intevation.gnv.jfreechart.PolygonSeries;
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6
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7 import de.intevation.gnv.raster.Vectorizer.Edge;
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9 import gnu.trove.TDoubleArrayList;
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11 import java.util.HashMap;
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12 import java.util.List;
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13
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14 /**
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15 * Vectorizer backend to produce polygon datasets suitable to being
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16 * displayed with {@link de.intevation.gnv.jfreechart.PolygonPlot}.
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17 *
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18 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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19 */
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20 public class PolygonDatasetProducer
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21 extends AbstractProducer
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22 {
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23 /**
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24 * Maps value integers to series of polygons to group
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25 * them by value.
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26 */
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27 protected HashMap<Integer, PolygonSeries> polygonSeries;
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28
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29 /**
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30 * Default constructor.
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31 */
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32 protected PolygonDatasetProducer() {
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33 }
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34
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35 /**
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36 * Constructor to create a PolygonDatasetProducer with
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37 * a given world bound box.
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38 * @param minX Min x coord of the world.
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39 * @param minY Min y coord of the world.
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40 * @param maxX Max x coord of the world.
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41 * @param maxY Max y coord of the world.
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42 */
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43 public PolygonDatasetProducer(
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44 double minX, double minY,
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45 double maxX, double maxY
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46
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47 ) {
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48 super(minX, minY, maxX, maxY);
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49 polygonSeries = new HashMap<Integer, PolygonSeries>();
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50 }
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51
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52 public void handleRings(
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53 List<Edge> rings,
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54 int value,
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55 int width,
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56 int height
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57 ) {
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58 if (value == -1) {
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59 return;
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60 }
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61
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62 Integer v = Integer.valueOf(value);
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63
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64 PolygonSeries ps = polygonSeries.get(v);
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65
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66 if (ps == null) {
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67 polygonSeries.put(v, ps = new PolygonSeries());
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68 ps.setAttribute("fill", v);
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69 }
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70
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71 TDoubleArrayList vertices = new TDoubleArrayList();
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72
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73 /* minX = 0*m1 + b1 <=> b1 = minX
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74 * maxX = (width-1)*m1 + b1
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75 * m1 = (maxX - minX)/(width-1)
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76 */
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77
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78 double b1 = minX;
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79 double m1 = width != 1
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80 ? (maxX - minX)/(width-1)
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81 : 0d;
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82
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83 double b2 = minY;
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84 double m2 = height != 1
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85 ? (maxY - minY)/(height-1)
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86 : 0d;
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87
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88 for (Edge head: rings) {
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89 Edge current = head;
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90 do {
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91 vertices.add(m1*(current.a % width) + b1);
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92 vertices.add(m2*(current.a / width) + b2);
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93 }
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94 while ((current = current.next) != head);
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95 ps.addRing(new CompactXYItems(vertices.toNativeArray()));
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96 vertices.reset();
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97 }
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98 }
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99
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100 /**
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101 * Creates a new PolygonDataset from the polygons build by this
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102 * backend.
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103 * @return the new PolygonDataset
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104 */
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105 public PolygonDataset getPolygonDataset() {
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106 return new PolygonDataset(polygonSeries.values());
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107 }
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108 }
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109 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org