Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/utils/IndexBuffer.java @ 852:b5f4b6073cde
Calculate the depth in an odv export of a 'Profilschnitt' properly (issue217).
gnv-artifacts/trunk@968 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Thu, 22 Apr 2010 08:54:36 +0000 |
parents | 6cff63d0c434 |
children | f953c9a559d8 |
rev | line source |
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1 package de.intevation.gnv.utils; |
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2 |
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3 import java.awt.Point; |
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4 |
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5 import java.awt.geom.Point2D; |
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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 <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> |
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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 } |
798
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169 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |