Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/jfree/JFreeUtil.java @ 6905:1b35b2ddfc28

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Artifacts: Introduce ThemeDocument & make stuff compileable again. THIS BREAKS THE SYSTEM! TODO: Move ThemeUtils into ThemeDocument.
author Sascha L. Teichmann <teichmann@intevation.de>
date Thu, 22 Aug 2013 23:31:38 +0200
parents af13ceeba52a
children e4606eae8ea5
rev   line source
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Sascha L. Teichmann <teichmann@intevation.de>
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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7 */
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8
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9 package org.dive4elements.river.jfree;
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10
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11 import java.awt.Shape;
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12 import java.awt.geom.Rectangle2D;
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13 import java.util.Iterator;
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14 import java.util.Random;
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15
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16 import org.apache.log4j.Logger;
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17 import org.jfree.chart.entity.ChartEntity;
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18 import org.jfree.chart.entity.EntityCollection;
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19
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20 import org.dive4elements.river.artifacts.math.Function;
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21 import org.dive4elements.river.themes.ThemeDocument;
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22
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23 public class JFreeUtil {
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24
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25 private static final Logger logger = Logger.getLogger(JFreeUtil.class);
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26
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27 /** Do not instantiate. */
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28 private JFreeUtil() {
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29 }
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30
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31
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32 /**
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33 * True if \param hotspot collides with a Entity in \param entities.
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34 * @param hotspot Shape to compare against other shapes (bounds only).
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35 * @param entities entities against which to compare shape.
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36 * @param exclusiveEntityClass If not null, consider only entities of
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37 * given class.
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38 * @return true if a collision (non-zero intersection) exists between
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39 * shapes.
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40 */
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41 public static boolean collides(Shape hotspot, EntityCollection entities,
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42 Class exclusiveEntityClass) {
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43 if (entities == null) return false;
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44
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45 Rectangle2D hotspotBox = hotspot.getBounds2D();
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46
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47 for (Iterator i = entities.iterator(); i.hasNext(); ) {
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48 Object next = i.next();
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49 ChartEntity entity = (ChartEntity) next;
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50 if (exclusiveEntityClass == null
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51 || exclusiveEntityClass.isInstance(entity))
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52 {
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53 if (entity.getArea().intersects(hotspotBox)) {
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54 // Found collision, early stop.
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55 return true;
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56 }
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57 }
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58 }
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59
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60 return false;
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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 * This function samples a randomized line that contains of x and y values
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66 * between <i>startX</i>, <i>endX</i>, <i>startY</i> and <i>endY</i>. The
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67 * number of points in the line is specified by <i>num</i>.
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68 *
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69 * @param num The number of points in the line.
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70 * @param startX The min value of the x values.
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71 * @param endX The max value of the x values.
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72 * @param startY The min value of the y values.
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73 * @param endY The max value of the y values.
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74 * @return an array with [allX-values, allY-values].
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75 * @throws IllegalArgumentException
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76 */
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77 public static double[][] randomizeLine(
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78 int num,
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79 double startX,
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80 double endX,
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81 double startY,
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82 double endY
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83 ) throws IllegalArgumentException
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84 {
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85 if (num <= 0) {
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86 throw new IllegalArgumentException("Parameter 'num' has to be > 0");
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87 }
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88
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89 Random random = new Random();
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90
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91 double[] x = new double[num];
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92 double[] y = new double[num];
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93
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94 for (int i = 0; i < num; i++) {
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95 double xFac = random.nextDouble();
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96 double yFac = random.nextDouble();
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97
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98 x[i] = startX + xFac * (endX - startX);
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99 y[i] = startY + yFac * (endY - startY);
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100
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101 logger.debug("Created new point: " + x[i] + "|" + y[i]);
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102 }
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103
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104 return new double[][] { x, y };
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105 }
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106
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107
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108 public static StyledXYSeries sampleFunction2D(
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109 Function func,
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110 ThemeDocument theme,
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111 String seriesKey,
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112 int samples,
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113 double start,
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114 double end
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115 ) {
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116 StyledXYSeries series = new StyledXYSeries(seriesKey, theme);
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117
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118 double step = (end - start) / (samples - 1);
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119
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120 for (int i = 0; i < samples; i++) {
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121 double x = start + (step * i);
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122 series.add(x, func.value(x));
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123 }
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124
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125 return series;
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126 }
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127
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128 public static StyledXYSeries sampleFunction2DPositive(
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129 Function func,
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130 ThemeDocument theme,
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131 String seriesKey,
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132 int samples,
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133 double start,
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134 double end
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135 ) {
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136 StyledXYSeries series = new StyledXYSeries(seriesKey, theme);
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137
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138 double step = (end - start) / (samples - 1);
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139
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140 for (int i = 0; i < samples; i++) {
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141 double x = start + (step * i);
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142 double v = func.value(x);
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143 if (x > 0d && v > 0d) {
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144 series.add(x, v);
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145 }
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146 }
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147
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148 return series;
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149 }
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150 }
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151 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org