Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/PolygonDatasetProducer.java @ 437:b624879d2902

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Added vectorizer rings callback to generate iso lines. gnv-artifacts/trunk@485 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sun, 27 Dec 2009 05:25:40 +0000
parents 6642ab6c583c
children f7038820df2e
rev   line source
436
6642ab6c583c 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
437
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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;
436
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74
437
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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;
436
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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 }
437
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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:
http://dive4elements.wald.intevation.org