Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/GridCell.java @ 517:96a1e92e7ed2

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If the number of data points to generate a "Horizontalschnitt" is above a given threshold, they are culled against an 5% extented bounding box of the interpolation area. gnv-artifacts/trunk@611 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sat, 23 Jan 2010 17:42:04 +0000
parents d9d933e06875
children 4e347624ee7c
rev   line source
514
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1 package de.intevation.gnv.math;
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2
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3 import com.vividsolutions.jts.geom.Coordinate;
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4 import com.vividsolutions.jts.geom.Envelope;
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5 import com.vividsolutions.jts.geom.Geometry;
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6 import com.vividsolutions.jts.geom.GeometryFactory;
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7 import com.vividsolutions.jts.geom.LinearRing;
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8 import com.vividsolutions.jts.geom.Point;
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9 import com.vividsolutions.jts.geom.Polygon;
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10
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11 import com.vividsolutions.jts.index.ItemVisitor;
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12
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13 import java.io.Serializable;
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14
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15 import java.util.ArrayList;
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16 import java.util.HashMap;
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17 import java.util.List;
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18
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19 import org.apache.log4j.Logger;
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20
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21 /**
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22 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
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23 */
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24 public class GridCell
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25 implements Serializable
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26 {
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27 private static Logger log = Logger.getLogger(GridCell.class);
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28
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29 public static final class CellFinder
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30 implements ItemVisitor
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31 {
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32 public GridCell found;
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33
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34 protected Point point;
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35
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36 public CellFinder() {
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37 }
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38
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39 public void prepare(Coordinate center) {
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40 found = null;
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41 point = GEOMETRY_FACTORY.createPoint(center);
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42 }
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43
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44 public void visitItem(Object item) {
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45 if (found == null) {
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46 GridCell cell = (GridCell)item;
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47 if (cell.contains(point)) {
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48 found = cell;
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49 }
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50 }
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51 }
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52 } // class CellFinder
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53
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54 public Point2d p1;
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55 public Point2d p2;
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56 public Point2d p3;
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57 public Point2d p4;
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58
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59 protected Polygon polygon;
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60
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61 public static final GeometryFactory GEOMETRY_FACTORY
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62 = new GeometryFactory();
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63
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64 public GridCell() {
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65 }
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66
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67 public GridCell(Point2d p1, Point2d p2, Point2d p3, Point2d p4) {
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68 this.p1 = p1;
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69 this.p2 = p2;
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70 this.p3 = p3;
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71 this.p4 = p4;
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72 createPolygon();
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73 }
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74
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75 protected void createPolygon() {
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76 LinearRing shell = GEOMETRY_FACTORY
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77 .createLinearRing(new Coordinate [] { p1, p2, p3, p4, p1 });
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78 polygon = GEOMETRY_FACTORY.createPolygon(shell, null);
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79 }
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80
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81 public Envelope getEnvelope() {
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82 return polygon.getEnvelopeInternal();
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83 }
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84
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85 public boolean contains(Geometry coord) {
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86 return polygon.contains(coord);
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87 }
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88
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89 public static List<GridCell> pointsToGridCells(
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90 List<? extends Point2d> points
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91 ) {
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92 return pointsToGridCells(points, null);
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93 }
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94
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95 public static List<GridCell> pointsToGridCells(
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96 List<? extends Point2d> points,
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97 Envelope relevantArea
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98 ) {
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99 int minI = Integer.MAX_VALUE;
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100 int maxI = Integer.MIN_VALUE;
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101 int minJ = Integer.MAX_VALUE;
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102 int maxJ = Integer.MIN_VALUE;
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103
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104 HashMap<Integer, HashMap<Integer, Point2d>> rows =
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105 new HashMap<Integer, HashMap<Integer, Point2d>>();
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106
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107 int culled = 0;
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108
514
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109 for (Point2d p: points) {
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110
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111 if (relevantArea != null && !relevantArea.contains(p.x, p.y)) {
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112 ++culled;
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113 continue;
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114 }
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115
514
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116 if (p.i < minI) minI = p.i;
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117 if (p.i > maxI) maxI = p.i;
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118 if (p.j < minJ) minJ = p.j;
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119 if (p.j > maxJ) maxJ = p.j;
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120
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121 HashMap<Integer, Point2d> row = rows.get(p.i);
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122
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123 if (row == null) {
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124 rows.put(p.i, row = new HashMap<Integer, Point2d>());
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125 }
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126
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127 row.put(p.j, p);
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128 }
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129
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130 if (log.isDebugEnabled()) {
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131 log.debug("culled points: " + culled);
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132 }
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133
514
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134 ArrayList<GridCell> cells = new ArrayList<GridCell>(points.size());
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135
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136 for (int i = minI + 1; i <= maxI; ++i) {
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137 HashMap<Integer, Point2d> row1 = rows.get(i-1);
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138 HashMap<Integer, Point2d> row2 = rows.get(i);
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139 if (row1 != null && row2 != null) {
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140 for (int j = minJ + 1; j < maxJ; ++j) {
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141 Point2d p1 = row1.get(j-1);
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142 Point2d p2 = row1.get(j);
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143 Point2d p3 = row2.get(j);
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144 Point2d p4 = row2.get(j-1);
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145
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146 if (p1 != null && p2 != null && p3 != null && p4 != null) {
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147 cells.add(new GridCell(p1, p2, p3, p4));
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148 }
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149 } // for all columns in row
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150 }
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151 } // for all rows
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152
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153 return cells;
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154 }
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155 }
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156 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org