Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/utils/IndexBuffer.java @ 503:b951b14425fa

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Solved issue 129. Renamed i and j axis to 'West-East-Axis' and 'North-South-Axis'. gnv-artifacts/trunk@586 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 20 Jan 2010 15:48:31 +0000
parents 555483213f78
children b1f5f2a8840f
rev   line source
349
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1 package de.intevation.gnv.utils;
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2
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3 import java.awt.geom.Point2D;
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4
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5 import java.awt.Point;
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6
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7 import java.util.List;
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8
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9 /**
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10 * Create buffers around integer pairs (i_1..n), j_1..n).
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11 *
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12 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
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13 */
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14 public class IndexBuffer
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15 {
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16 public static final double EPSILON = 1e-6d;
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17 public static final double OFFSET = 1.0d;
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18
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19 public static final String I_COLUMN = "IPOSITION";
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20 public static final String J_COLUMN = "JPOSITION";
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21
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22 public static final class Segment {
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23
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24 private Segment next;
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25
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26 private Point2D.Double n;
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27 private double d1;
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28 private double d2;
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29
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30 private int iMin;
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31 private int iMax;
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32
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33 private int jMin;
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34 private int jMax;
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35
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36 public Segment(Point a, Point b, Segment next) {
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37
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38 this.next = next;
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39
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40 iMin = Math.min(a.x, b.x)-1;
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41 iMax = Math.max(a.x, b.x)+1;
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42
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43 jMin = Math.min(a.y, b.y)-1;
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44 jMax = Math.max(a.y, b.y)+1;
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45
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46 if (a.x > b.x) {
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47 Point p = a; a = b; b = p;
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48 }
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49
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50 Point2D.Double p1, p2, p3;
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51
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52 if (a.y < b.y) {
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53 p1 = new Point2D.Double(a.x - OFFSET, a.y + 1 + OFFSET);
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54 p2 = new Point2D.Double(b.x - OFFSET, b.y + 1 + OFFSET);
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55 p3 = new Point2D.Double(a.x + 1 + OFFSET, a.y - OFFSET);
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56 }
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57 else {
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58 p1 = new Point2D.Double(a.x + 1 + OFFSET, a.y + 1 + OFFSET);
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59 p2 = new Point2D.Double(b.x + 1 + OFFSET, b.y + 1 + OFFSET);
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60 p3 = new Point2D.Double(b.x - OFFSET, b.y - OFFSET);
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61 }
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62
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63 n = normalize(orthogonal(sub(p1, p2)));
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64
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65 d1 = dot(n, p1);
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66 d2 = dot(n, p3);
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67
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68 if (d1 > d2) {
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69 double d = d1;
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70 d1 = d2;
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71 d2 = d;
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72 }
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73 }
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74
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75 public boolean check(int i, int j) {
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76 if (i < iMin || i > iMax || j < jMin || j > jMax) {
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77 return false;
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78 }
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79 double v = dot(n, i, j);
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80 return v >= d1 && v <= d2;
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81 }
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82
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83 public void toWhereClause(StringBuilder sb, String iColumn, String jColumn) {
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84 sb.append('(')
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85 .append(iColumn).append(" >= ").append(iMin).append(" AND ")
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86 .append(iColumn).append(" <= ").append(iMax).append(" AND ")
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87 .append(jColumn).append(" >= ").append(jMin).append(" AND ")
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88 .append(jColumn).append(" <= ").append(jMax).append(" AND (")
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89 .append(n.x).append('*').append(iColumn).append(" + ")
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90 .append(n.y).append('*').append(jColumn)
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91 .append(") BETWEEN ").append(d1).append(" AND ").append(d2).append(')');
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92 }
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93 } // class Segment
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94
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95 protected Segment head;
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96
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97 protected String iColumn;
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98 protected String jColumn;
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99
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100 public IndexBuffer(List<? extends Point> points) {
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101 this(points, I_COLUMN, J_COLUMN);
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102 }
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103
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104 public IndexBuffer(List<? extends Point> points, String iColumn, String jColumn) {
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105 this.iColumn = iColumn;
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106 this.jColumn = jColumn;
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107
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108 for (int i = 1, N = points.size(); i < N; ++i) {
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109 Point p1 = (Point)points.get(i-1);
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110 Point p2 = (Point)points.get(i);
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111 head = new Segment(p1, p2, head);
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112 }
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113 }
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114
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115 public boolean check(int i, int j) {
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116
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117 Segment current = head;
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118 while (current != null) {
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119 if (current.check(i, j)) {
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120 return true;
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121 }
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122 current = current.next;
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123 }
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124 return false;
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125 }
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126
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127 public String toWhereClause() {
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128
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129 StringBuilder sb = new StringBuilder();
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130
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131 Segment current = head;
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132
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133 while (current != null) {
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134 if (current != head) {
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135 sb.append(" OR ");
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136 }
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137 current.toWhereClause(sb, iColumn, jColumn);
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138 current = current.next;
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139 }
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140
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141 return sb.toString();
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142 }
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143
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144 public static Point2D.Double sub(Point2D.Double p1, Point2D.Double p2) {
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145 return new Point2D.Double(p1.x - p2.x, p1.y - p2.y);
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146 }
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147
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148 public static final double dot(Point2D.Double p1, Point2D.Double p2) {
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149 return p1.x*p2.x + p1.y*p2.y;
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150 }
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151
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152 public static final double dot(Point2D.Double p1, double x, double y) {
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153 return p1.x*x + p1.y*y;
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154 }
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155
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156 public static final Point2D.Double scale(Point2D.Double p, double s) {
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157 return new Point2D.Double(s*p.x, s*p.y);
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158 }
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159
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160 public static final Point2D.Double normalize(Point2D.Double p) {
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161 double len2 = Math.sqrt(dot(p, p));
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162 return len2 > EPSILON ? scale(p, 1d/len2) : p;
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163 }
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164
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165 public static final Point2D.Double orthogonal(Point2D.Double p) {
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166 return new Point2D.Double(p.y, -p.x);
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167 }
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168 }
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169 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org