Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/jfree/JFreeUtil.java @ 4229:207de712d79d

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Move addMember and removeMember methods in GaugePanel class Also rename class member variable sectionStack to section to avoid confusion.
author Björn Ricks <bjoern.ricks@intevation.de>
date Tue, 23 Oct 2012 15:48:18 +0200
parents 5a8f8fd5310c
children 080411ac948f
rev   line source
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1 package de.intevation.flys.jfree;
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2
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3 import java.awt.Shape;
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4 import java.awt.geom.Rectangle2D;
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5 import java.util.Iterator;
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6 import java.util.Random;
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7
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8 import org.apache.log4j.Logger;
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9 import org.jfree.chart.entity.ChartEntity;
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10 import org.jfree.chart.entity.EntityCollection;
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11 import org.w3c.dom.Document;
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12
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13 import de.intevation.flys.artifacts.math.Function;
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14
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15 public class JFreeUtil {
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16
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17 private static final Logger logger = Logger.getLogger(JFreeUtil.class);
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18
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19 /** Do not instantiate. */
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20 private JFreeUtil() {
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21 }
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22
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23
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24 /**
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25 * True if \param hotspot collides with a Entity in \param entities.
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26 * @param hotspot Shape to compare against other shapes (bounds only).
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27 * @param entities entities against which to compare shape.
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28 * @param exclusiveEntityClass If not null, consider only entities of
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29 * given class.
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30 * @return true if a collision (non-zero intersection) exists between
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31 * shapes.
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32 */
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33 public static boolean collides(Shape hotspot, EntityCollection entities,
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34 Class exclusiveEntityClass) {
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35 if (entities == null) return false;
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36
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37 Rectangle2D hotspotBox = hotspot.getBounds2D();
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38
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39 for (Iterator i = entities.iterator(); i.hasNext(); ) {
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40 Object next = i.next();
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41 ChartEntity entity = (ChartEntity) next;
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42 if (exclusiveEntityClass == null
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43 || exclusiveEntityClass.isInstance(entity))
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44 {
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45 if (entity.getArea().intersects(hotspotBox)) {
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46 // Found collision, early stop.
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47 return true;
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48 }
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49 }
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50 }
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51
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52 return false;
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53 }
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54
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55
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56 /**
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57 * This function samples a randomized line that contains of x and y values
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58 * between <i>startX</i>, <i>endX</i>, <i>startY</i> and <i>endY</i>. The
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59 * number of points in the line is specified by <i>num</i>.
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60 *
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61 * @param num The number of points in the line.
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62 * @param startX The min value of the x values.
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63 * @param endX The max value of the x values.
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64 * @param startY The min value of the y values.
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65 * @param endY The max value of the y values.
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66 * @return an array with [allX-values, allY-values].
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67 * @throws IllegalArgumentException
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68 */
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69 public static double[][] randomizeLine(
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70 int num,
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71 double startX,
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72 double endX,
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73 double startY,
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74 double endY
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75 ) throws IllegalArgumentException
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76 {
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77 if (num <= 0) {
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78 throw new IllegalArgumentException("Parameter 'num' has to be > 0");
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79 }
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80
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81 Random random = new Random();
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82
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83 double[] x = new double[num];
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84 double[] y = new double[num];
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85
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86 for (int i = 0; i < num; i++) {
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87 double xFac = random.nextDouble();
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88 double yFac = random.nextDouble();
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89
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90 x[i] = startX + xFac * (endX - startX);
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91 y[i] = startY + yFac * (endY - startY);
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92
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93 logger.debug("Created new point: " + x[i] + "|" + y[i]);
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94 }
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95
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96 return new double[][] { x, y };
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97 }
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98
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99
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100 public static StyledXYSeries sampleFunction2D(
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101 Function func,
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102 Document theme,
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103 String seriesKey,
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104 int samples,
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105 double start,
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106 double end
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107 ) {
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108 StyledXYSeries series = new StyledXYSeries(seriesKey, theme);
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109
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110 double step = (end - start) / (samples - 1);
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111
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112 for (int i = 0; i < samples; i++) {
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113 double x = start + (step * i);
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114 series.add(x, func.value(x));
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115 }
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116
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117 return series;
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118 }
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119 }
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120 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org