Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/PolygonDatasetProducer.java @ 605:e8ebdbc7f1e3

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First step of removing the cache blob. The static part of the describe document will be created by using the input data stored at each state. Some TODOs left (see ChangeLog). gnv-artifacts/trunk@671 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 09 Feb 2010 14:27:55 +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
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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