Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/utils/IndexBuffer.java @ 522:c896282c2601

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Issue 156 solved. Added width, height and points as parameter to svg and pdf output mode. Width and height have an effact on the width and height of the export, points is a boolean property which enables/disables the drawing of data points. gnv-artifacts/trunk@616 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Mon, 25 Jan 2010 09:18:31 +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