Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/PolygonDatasetProducer.java @ 626:61f688a69a55

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Split up export modes from output modes. gnv-artifacts/trunk@700 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 23 Feb 2010 11:47:08 +0000
parents 1bf058f1a2d1
children 9a828e5a2390
rev   line source
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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.Edge;
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9
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10 import de.intevation.gnv.jfreechart.PolygonSeries;
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11 import de.intevation.gnv.jfreechart.PolygonDataset;
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12 import de.intevation.gnv.jfreechart.CompactXYItems;
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13
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14 /**
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15 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
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16 */
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17 public class PolygonDatasetProducer
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18 extends AbstractProducer
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19 {
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20 protected HashMap<Integer, PolygonSeries> polygonSeries;
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21
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22 protected PolygonDatasetProducer() {
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23 }
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24
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25 public PolygonDatasetProducer(
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26 double minX, double minY,
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27 double maxX, double maxY
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28
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29 ) {
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30 super(minX, minY, maxX, maxY);
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31 polygonSeries = new HashMap<Integer, PolygonSeries>();
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32 }
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33
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34 public void handleRings(
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35 List<Edge> rings,
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36 int value,
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37 int width,
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38 int height
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39 ) {
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40 if (value == -1) {
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41 return;
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42 }
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43
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44 Integer v = Integer.valueOf(value);
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45
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46 PolygonSeries ps = polygonSeries.get(v);
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47
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48 if (ps == null) {
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49 polygonSeries.put(v, ps = new PolygonSeries());
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50 ps.setAttribute("fill", v);
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51 }
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52
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53 TDoubleArrayList vertices = new TDoubleArrayList();
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54
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55 /* minX = 0*m1 + b1 <=> b1 = minX
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56 * maxX = (width-1)*m1 + b1
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57 * m1 = (maxX - minX)/(width-1)
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58 */
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59
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60 double b1 = minX;
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61 double m1 = width != 1
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62 ? (maxX - minX)/(width-1)
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63 : 0d;
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64
437
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65 double b2 = minY;
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66 double m2 = height != 1
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67 ? (maxY - minY)/(height-1)
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68 : 0d;
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69
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70 for (Edge head: rings) {
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71 Edge current = head;
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72 do {
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73 vertices.add(m1*(current.a % width) + b1);
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74 vertices.add(m2*(current.a / width) + b2);
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75 }
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76 while ((current = current.next) != head);
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77 ps.addRing(new CompactXYItems(vertices.toNativeArray()));
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78 vertices.reset();
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79 }
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80 }
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81
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82 public PolygonDataset getPolygonDataset() {
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83 return new PolygonDataset(polygonSeries.values());
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84 }
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85 }
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86 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org