Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/PolygonDatasetProducer.java @ 453:537e663d6c0c
vertical cross section: Fixed problem with running to max depth on every column in interpolation.
gnv-artifacts/trunk@501 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Mon, 04 Jan 2010 13:42:49 +0000 |
parents | b624879d2902 |
children | f7038820df2e |
rev | line source |
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Added vectorizer rings callback which generates polygon datasets suitable
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1 package de.intevation.gnv.raster; |
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2 |
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3 import java.util.List; |
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4 import java.util.HashMap; |
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5 |
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6 import gnu.trove.TDoubleArrayList; |
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7 |
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8 import de.intevation.gnv.raster.Vectorizer.RingsHandler; |
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9 import de.intevation.gnv.raster.Vectorizer.Edge; |
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10 |
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11 import de.intevation.gnv.jfreechart.PolygonSeries; |
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12 import de.intevation.gnv.jfreechart.PolygonDataset; |
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13 import de.intevation.gnv.jfreechart.CompactXYItems; |
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14 |
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15 /** |
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16 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de) |
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17 */ |
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18 public class PolygonDatasetProducer |
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19 implements RingsHandler |
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20 { |
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21 protected double minX; |
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22 protected double minY; |
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23 protected double maxX; |
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24 protected double maxY; |
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25 |
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26 protected HashMap<Integer, PolygonSeries> polygonSeries; |
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27 |
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28 protected PolygonDatasetProducer() { |
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29 } |
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30 |
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31 public PolygonDatasetProducer( |
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32 double minX, double minY, |
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33 double maxX, double maxY |
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34 |
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35 ) { |
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36 this.minX = minX; |
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37 this.minY = minY; |
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38 this.maxX = maxX; |
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39 this.maxY = maxY; |
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40 |
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41 polygonSeries = new HashMap<Integer, PolygonSeries>(); |
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42 } |
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43 |
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44 public void handleRings( |
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45 List<Edge> rings, |
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46 int value, |
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47 int width, |
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48 int height |
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49 ) { |
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50 if (value == -1) { |
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51 return; |
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52 } |
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53 |
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54 Integer v = Integer.valueOf(value); |
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55 |
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56 PolygonSeries ps = (PolygonSeries)polygonSeries.get(v); |
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57 |
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58 if (ps == null) { |
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59 polygonSeries.put(v, ps = new PolygonSeries()); |
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60 ps.setAttribute("fill", v); |
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61 } |
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62 |
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63 TDoubleArrayList vertices = new TDoubleArrayList(); |
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64 |
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65 /* minX = 0*m1 + b1 <=> b1 = minX |
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66 * maxX = (width-1)*m1 + b1 |
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67 * m1 = (maxX - minX)/(width-1) |
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68 */ |
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69 |
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70 double b1 = minX; |
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71 double m1 = width != 1 |
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72 ? (maxX - minX)/(width-1) |
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73 : 0d; |
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74 |
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75 double b2 = minY; |
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76 double m2 = height != 1 |
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77 ? (maxY - minY)/(height-1) |
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78 : 0d; |
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79 |
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80 for (Edge head: rings) { |
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81 Edge current = head; |
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82 do { |
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83 vertices.add(m1*(current.a % width) + b1); |
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84 vertices.add(m2*(current.a / width) + b2); |
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85 } |
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86 while ((current = current.next) != head); |
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87 ps.addRing(new CompactXYItems(vertices.toNativeArray())); |
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88 vertices.clear(); |
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89 } |
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90 } |
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91 |
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92 public PolygonDataset getPolygonDataset() { |
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93 return new PolygonDataset(polygonSeries.values()); |
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94 } |
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95 } |
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96 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: |