Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/jfreechart/CompactXYItems.java @ 1062:58b4a07db856

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Cach improvement: remove the cached elements of each visited state that is visited while stepping back to a previous state. gnv-artifacts/trunk@1147 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 02 Jun 2010 09:52:39 +0000
parents 05bf8534a35a
children f953c9a559d8
rev   line source
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1 package de.intevation.gnv.jfreechart;
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2
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3 import java.io.Serializable;
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4
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5 /**
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6 * This class is used to represent geometries (e.g. point, line, polygon). Each
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7 * geometry is made up of multiple xy points stored in a single array. A line
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8 * composed by start- and endpoint is stored in the following order in that
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9 * array: [x1, y1, x2, y2].
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10 *
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11 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha Teichmann</a>
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12 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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13 */
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14 public class CompactXYItems
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15 implements Serializable
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16 {
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17 /**
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18 * Array storing the xy items.
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19 */
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20 protected double [] data;
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21
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22 /**
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23 * Constructs a new CompactXYItems object with the given data.
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24 *
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25 * @param data An array with xy values.
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26 */
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27 public CompactXYItems(double [] data) {
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28 this.data = data;
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29 }
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30
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31 /**
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32 * Retrieves the x coordinate of the point with the given index.
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33 *
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34 * @param index Index
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35 * @return X coordinate.
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36 */
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37 public double getX(int index) {
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38 return data[index << 1];
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39 }
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40
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41 /**
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42 * Retrieves the y coordinate of the point with the given index.
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43 *
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44 * @param index Index
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45 * @return Y coordinate.
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46 */
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47 public double getY(int index) {
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48 return data[(index << 1)+1];
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49 }
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50
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51 /**
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52 * Write the tupel of xy-values at a specific index into the given array.
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53 *
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54 * @param index Index used to specify the xy-value.
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55 * @param xy the xy coordinate is written into this array with the following
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56 * order: [x,y]
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57 */
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58 public void get(int index, double [] xy) {
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59 xy[0] = data[index = (index << 1) + 1];
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60 xy[1] = data[index + 1];
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61 }
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62
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63 /**
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64 *
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65 * @return the data array.
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66 */
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67 public double [] getData() {
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68 return data;
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69 }
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70
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71 /**
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72 *
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73 * @param data
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74 */
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75 public void setData(double [] data) {
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76 this.data = data;
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77 }
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78
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79 /**
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80 *
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81 * @return the number of data points.
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82 */
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83 public int size() {
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84 return data.length >> 1;
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85 }
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86
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87 /**
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88 * Retrieves the bounding box spaned by the coordinates in the data array.
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89 *
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90 * @param bbox
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91 * @return the calculated bounding box.
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92 */
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93 public double [] calculateBoundingBox(double [] bbox) {
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94 for (int i = 0; i < data.length;) {
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95 double x = data[i++];
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96 double y = data[i++];
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97 if (x < bbox[0]) bbox[0] = x;
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98 if (y < bbox[1]) bbox[1] = y;
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99 if (x > bbox[2]) bbox[2] = x;
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100 if (y > bbox[3]) bbox[3] = y;
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101 }
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102 return bbox;
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103 }
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104
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105 /**
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106 *
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107 * @return the coordinates as string.
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108 */
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109 @Override
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110 public String toString() {
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111 StringBuilder sb = new StringBuilder();
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112 for (int i = 0; i < data.length;) {
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113 if (i > 0) sb.append("; ");
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114 sb.append('(');
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115 sb.append(data[i++]);
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116 sb.append(", ");
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117 sb.append(data[i++]);
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118 sb.append(')');
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119 }
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120 return sb.toString();
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121 }
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122
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123
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124 /**
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125 *
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126 * @return the lowest x value.
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127 */
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128 public double getMinX() {
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129 double lower = Double.POSITIVE_INFINITY;
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130
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131 for (int i = 0; i < data.length; i += 2) {
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132 double x = data[i];
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133
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134 if (!Double.isNaN(x)) {
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135 lower = Math.min(lower, x);
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136 }
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137 }
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138
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139 return lower;
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140 }
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141
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142
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143 /**
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144 *
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145 * @return the highest x value.
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146 */
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147 public double getMaxX() {
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148 double upper = Double.NEGATIVE_INFINITY;
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149
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150 for (int i = 0; i < data.length; i += 2) {
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151 double x = data[i];
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152
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153 if (!Double.isNaN(x)) {
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154 upper = Math.max(upper, x);
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155 }
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156 }
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157
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158 return upper;
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159 }
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160
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161
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162 /**
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163 *
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164 * @return the lowest y value.
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165 */
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166 public double getMinY() {
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167 double lower = Double.POSITIVE_INFINITY;
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168
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169 for (int i = 1; i < data.length; i += 2) {
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170 double y = data[i];
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171
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172 if (!Double.isNaN(y)) {
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173 lower = Math.min(lower, y);
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174 }
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175 }
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176
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177 return lower;
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178 }
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179
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180
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181 /**
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182 *
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183 * @return the highest y value.
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184 */
422
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185 public double getMaxY() {
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186 double upper = Double.NEGATIVE_INFINITY;
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187
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188 for (int i = 1; i < data.length; i += 2) {
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189 double y = data[i];
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190
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191 if (!Double.isNaN(y)) {
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192 upper = Math.max(upper, y);
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193 }
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194 }
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195
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196 return upper;
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197 }
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198 }
836
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199 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org