Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/PolygonDatasetProducer.java @ 1142:12abbf15f18a
dummy merge for repo head
author | Thomas Arendsen Hein <thomas@intevation.de> |
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date | Fri, 28 Sep 2012 12:15:20 +0200 |
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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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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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112 */ |
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Added vectorizer rings callback which generates polygon datasets suitable
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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113 public PolygonDataset getPolygonDataset() { |
6642ab6c583c
Added vectorizer rings callback which generates polygon datasets suitable
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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114 return new PolygonDataset(polygonSeries.values()); |
6642ab6c583c
Added vectorizer rings callback which generates polygon datasets suitable
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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115 } |
6642ab6c583c
Added vectorizer rings callback which generates polygon datasets suitable
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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116 } |
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Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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117 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |