Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/jfree/JFreeUtil.java @ 7119:988dde49ae65

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Fix area label rendering. Previously the showarealabel setting was neither parsed nor used to decide if the arealabel should be drawn. It is mostly off but enabled for Cross Sections. It is now also shown in the style editors in case someone got used to it ;)
author Andre Heinecke <aheinecke@intevation.de>
date Tue, 24 Sep 2013 18:13:51 +0200
parents 1b35b2ddfc28
children e4606eae8ea5
rev   line source
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Sascha L. Teichmann <teichmann@intevation.de>
parents: 5838
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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