Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/utils/IndexBuffer.java @ 1116:2d393d79c097

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Added author names. gnv-artifacts/trunk@1262 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 04 Nov 2010 21:46:58 +0000
parents f953c9a559d8
children
rev   line source
1115
f953c9a559d8 Added license file and license headers.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 798
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1 /*
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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2 * Copyright (c) 2010 by Intevation GmbH
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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3 *
f953c9a559d8 Added license file and license headers.
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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
349
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9 package de.intevation.gnv.utils;
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10
779
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11 import java.awt.Point;
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12
349
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13 import java.awt.geom.Point2D;
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14
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15 import java.util.List;
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16
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17 /**
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18 * Create buffers around integer pairs (i_1..n), j_1..n).
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19 *
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c4156275c1e1 Bring @author javadoc tags in form '@author <a href="john.doe@example.com">John Doe</a>'
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20 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
349
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21 */
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22 public class IndexBuffer
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23 {
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24 public static final double EPSILON = 1e-6d;
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25 public static final double OFFSET = 1.0d;
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26
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27 public static final String I_COLUMN = "IPOSITION";
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28 public static final String J_COLUMN = "JPOSITION";
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29
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30 public static final class Segment {
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31
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32 private Segment next;
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33
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34 private Point2D.Double n;
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35 private double d1;
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36 private double d2;
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37
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38 private int iMin;
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39 private int iMax;
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40
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41 private int jMin;
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42 private int jMax;
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43
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44 public Segment(Point a, Point b, Segment next) {
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45
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46 this.next = next;
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47
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48 iMin = Math.min(a.x, b.x)-1;
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49 iMax = Math.max(a.x, b.x)+1;
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50
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51 jMin = Math.min(a.y, b.y)-1;
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52 jMax = Math.max(a.y, b.y)+1;
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53
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54 if (a.x > b.x) {
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55 Point p = a; a = b; b = p;
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56 }
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57
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58 Point2D.Double p1, p2, p3;
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59
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60 if (a.y < b.y) {
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61 p1 = new Point2D.Double(a.x - OFFSET, a.y + 1 + OFFSET);
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62 p2 = new Point2D.Double(b.x - OFFSET, b.y + 1 + OFFSET);
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63 p3 = new Point2D.Double(a.x + 1 + OFFSET, a.y - OFFSET);
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64 }
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65 else {
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66 p1 = new Point2D.Double(a.x + 1 + OFFSET, a.y + 1 + OFFSET);
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67 p2 = new Point2D.Double(b.x + 1 + OFFSET, b.y + 1 + OFFSET);
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68 p3 = new Point2D.Double(b.x - OFFSET, b.y - OFFSET);
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69 }
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70
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71 n = normalize(orthogonal(sub(p1, p2)));
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72
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73 d1 = dot(n, p1);
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74 d2 = dot(n, p3);
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75
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76 if (d1 > d2) {
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77 double d = d1;
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78 d1 = d2;
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79 d2 = d;
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80 }
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81 }
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82
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83 public boolean check(int i, int j) {
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84 if (i < iMin || i > iMax || j < jMin || j > jMax) {
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85 return false;
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86 }
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87 double v = dot(n, i, j);
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88 return v >= d1 && v <= d2;
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89 }
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90
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91 public void toWhereClause(StringBuilder sb, String iColumn, String jColumn) {
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92 sb.append('(')
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93 .append(iColumn).append(" >= ").append(iMin).append(" AND ")
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94 .append(iColumn).append(" <= ").append(iMax).append(" AND ")
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95 .append(jColumn).append(" >= ").append(jMin).append(" AND ")
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96 .append(jColumn).append(" <= ").append(jMax).append(" AND (")
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97 .append(n.x).append('*').append(iColumn).append(" + ")
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98 .append(n.y).append('*').append(jColumn)
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99 .append(") BETWEEN ").append(d1).append(" AND ").append(d2).append(')');
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100 }
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101 } // class Segment
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102
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103 protected Segment head;
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104
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105 protected String iColumn;
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106 protected String jColumn;
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107
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108 public IndexBuffer(List<? extends Point> points) {
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109 this(points, I_COLUMN, J_COLUMN);
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110 }
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111
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112 public IndexBuffer(List<? extends Point> points, String iColumn, String jColumn) {
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113 this.iColumn = iColumn;
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114 this.jColumn = jColumn;
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115
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116 for (int i = 1, N = points.size(); i < N; ++i) {
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117 Point p1 = (Point)points.get(i-1);
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118 Point p2 = (Point)points.get(i);
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119 head = new Segment(p1, p2, head);
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120 }
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121 }
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122
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123 public boolean check(int i, int j) {
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124
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125 Segment current = head;
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126 while (current != null) {
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127 if (current.check(i, j)) {
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128 return true;
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129 }
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130 current = current.next;
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131 }
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132 return false;
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133 }
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134
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135 public String toWhereClause() {
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136
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137 StringBuilder sb = new StringBuilder();
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138
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139 Segment current = head;
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140
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141 while (current != null) {
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142 if (current != head) {
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143 sb.append(" OR ");
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144 }
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145 current.toWhereClause(sb, iColumn, jColumn);
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146 current = current.next;
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147 }
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148
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149 return sb.toString();
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150 }
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151
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152 public static Point2D.Double sub(Point2D.Double p1, Point2D.Double p2) {
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153 return new Point2D.Double(p1.x - p2.x, p1.y - p2.y);
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154 }
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155
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156 public static final double dot(Point2D.Double p1, Point2D.Double p2) {
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157 return p1.x*p2.x + p1.y*p2.y;
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158 }
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159
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160 public static final double dot(Point2D.Double p1, double x, double y) {
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161 return p1.x*x + p1.y*y;
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162 }
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163
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164 public static final Point2D.Double scale(Point2D.Double p, double s) {
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165 return new Point2D.Double(s*p.x, s*p.y);
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166 }
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167
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168 public static final Point2D.Double normalize(Point2D.Double p) {
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169 double len2 = Math.sqrt(dot(p, p));
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170 return len2 > EPSILON ? scale(p, 1d/len2) : p;
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171 }
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172
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173 public static final Point2D.Double orthogonal(Point2D.Double p) {
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174 return new Point2D.Double(p.y, -p.x);
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175 }
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176 }
798
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177 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org