Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/PolygonDatasetProducer.java @ 1129:ccfa07b88476

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merged geo-backend
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:14:01 +0200
parents f953c9a559d8
children
rev   line source
1115
f953c9a559d8 Added license file and license headers.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 803
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.gnv.raster;
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10
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11 import de.intevation.gnv.jfreechart.CompactXYItems;
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12 import de.intevation.gnv.jfreechart.PolygonDataset;
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13 import de.intevation.gnv.jfreechart.PolygonSeries;
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14
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15 import de.intevation.gnv.raster.Vectorizer.Edge;
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16
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17 import gnu.trove.TDoubleArrayList;
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18
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19 import java.util.HashMap;
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20 import java.util.List;
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21
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22 /**
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23 * Vectorizer backend to produce polygon datasets suitable to being
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24 * displayed with {@link de.intevation.gnv.jfreechart.PolygonPlot}.
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25 *
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26 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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27 */
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28 public class PolygonDatasetProducer
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29 extends AbstractProducer
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30 {
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31 /**
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32 * Maps value integers to series of polygons to group
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33 * them by value.
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34 */
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35 protected HashMap<Integer, PolygonSeries> polygonSeries;
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36
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37 /**
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38 * Default constructor.
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39 */
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40 protected PolygonDatasetProducer() {
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41 }
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42
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43 /**
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44 * Constructor to create a PolygonDatasetProducer with
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45 * a given world bound box.
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46 * @param minX Min x coord of the world.
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47 * @param minY Min y coord of the world.
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48 * @param maxX Max x coord of the world.
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49 * @param maxY Max y coord of the world.
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50 */
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51 public PolygonDatasetProducer(
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52 double minX, double minY,
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53 double maxX, double maxY
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54
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55 ) {
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56 super(minX, minY, maxX, maxY);
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57 polygonSeries = new HashMap<Integer, PolygonSeries>();
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58 }
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59
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60 public void handleRings(
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61 List<Edge> rings,
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62 int value,
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63 int width,
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64 int height
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65 ) {
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66 if (value == -1) {
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67 return;
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68 }
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69
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70 Integer v = Integer.valueOf(value);
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71
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72 PolygonSeries ps = polygonSeries.get(v);
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73
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74 if (ps == null) {
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75 polygonSeries.put(v, ps = new PolygonSeries());
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76 ps.setAttribute("fill", v);
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77 }
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78
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79 TDoubleArrayList vertices = new TDoubleArrayList();
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80
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81 /* minX = 0*m1 + b1 <=> b1 = minX
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82 * maxX = (width-1)*m1 + b1
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83 * m1 = (maxX - minX)/(width-1)
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84 */
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85
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86 double b1 = minX;
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87 double m1 = width != 1
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88 ? (maxX - minX)/(width-1)
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89 : 0d;
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90
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91 double b2 = minY;
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92 double m2 = height != 1
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93 ? (maxY - minY)/(height-1)
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94 : 0d;
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95
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96 for (Edge head: rings) {
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97 Edge current = head;
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98 do {
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99 vertices.add(m1*(current.a % width) + b1);
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100 vertices.add(m2*(current.a / width) + b2);
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101 }
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102 while ((current = current.next) != head);
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103 ps.addRing(new CompactXYItems(vertices.toNativeArray()));
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104 vertices.reset();
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105 }
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106 }
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107
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108 /**
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109 * Creates a new PolygonDataset from the polygons build by this
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110 * backend.
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111 * @return the new PolygonDataset
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112 */
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113 public PolygonDataset getPolygonDataset() {
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114 return new PolygonDataset(polygonSeries.values());
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115 }
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116 }
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117 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org