Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/jfree/JFreeUtil.java @ 9801:1d7a72a50183 3.2.x tip

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Assume Compose V2, consistently
author Tom Gottfried <tom@intevation.de>
date Thu, 23 Nov 2023 10:14:13 +0100
parents 0a5239a1e46e
children
rev   line source
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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.logging.log4j.Logger;
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17 import org.apache.logging.log4j.LogManager;
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18 import org.jfree.chart.entity.ChartEntity;
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19 import org.jfree.chart.entity.EntityCollection;
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20
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21 import org.dive4elements.river.artifacts.math.Function;
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22 import org.dive4elements.river.themes.ThemeDocument;
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23
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24 public class JFreeUtil {
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25
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26 private static final Logger log = LogManager.getLogger(JFreeUtil.class);
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27
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28 /** Do not instantiate. */
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29 private JFreeUtil() {
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30 }
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31
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32
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33 /**
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34 * True if \param hotspot collides with a Entity in \param entities.
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35 * @param hotspot Shape to compare against other shapes (bounds only).
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36 * @param entities entities against which to compare shape.
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37 * @param exclusiveEntityClass If not null, consider only entities of
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38 * given class.
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39 * @return true if a collision (non-zero intersection) exists between
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40 * shapes.
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41 */
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42 public static boolean collides(Shape hotspot, EntityCollection entities,
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43 Class exclusiveEntityClass) {
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44 if (entities == null) return false;
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45
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46 Rectangle2D hotspotBox = hotspot.getBounds2D();
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47
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48 for (Iterator i = entities.iterator(); i.hasNext(); ) {
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49 Object next = i.next();
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50 ChartEntity entity = (ChartEntity) next;
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51 if (exclusiveEntityClass == null
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52 || exclusiveEntityClass.isInstance(entity))
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53 {
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54 if (entity.getArea().intersects(hotspotBox)) {
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55 // Found collision, early stop.
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56 return true;
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57 }
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58 }
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59 }
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60
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61 return false;
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62 }
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63
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64
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65 /**
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66 * This function samples a randomized line that contains of x and y values
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67 * between <i>startX</i>, <i>endX</i>, <i>startY</i> and <i>endY</i>. The
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68 * number of points in the line is specified by <i>num</i>.
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69 *
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70 * @param num The number of points in the line.
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71 * @param startX The min value of the x values.
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72 * @param endX The max value of the x values.
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73 * @param startY The min value of the y values.
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74 * @param endY The max value of the y values.
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75 * @return an array with [allX-values, allY-values].
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76 * @throws IllegalArgumentException
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77 */
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78 public static double[][] randomizeLine(
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79 int num,
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80 double startX,
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81 double endX,
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82 double startY,
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83 double endY
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84 ) throws IllegalArgumentException
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85 {
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86 if (num <= 0) {
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87 throw new IllegalArgumentException("Parameter 'num' has to be > 0");
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88 }
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89
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90 Random random = new Random();
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91
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92 double[] x = new double[num];
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93 double[] y = new double[num];
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94
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95 for (int i = 0; i < num; i++) {
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96 double xFac = random.nextDouble();
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97 double yFac = random.nextDouble();
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98
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99 x[i] = startX + xFac * (endX - startX);
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100 y[i] = startY + yFac * (endY - startY);
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101
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102 log.debug("Created new point: " + x[i] + "|" + y[i]);
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103 }
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104
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105 return new double[][] { x, y };
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106 }
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107
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108
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109 public static StyledXYSeries sampleFunction2D(
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110 Function func,
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111 ThemeDocument theme,
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112 String seriesKey,
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113 int samples,
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114 double start,
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115 double end
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116 ) {
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117 StyledXYSeries series = new StyledXYSeries(seriesKey, theme);
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118
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119 double step = (end - start) / (samples - 1);
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120
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121 for (int i = 0; i < samples; i++) {
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122 double x = start + (step * i);
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123 series.add(x, func.value(x));
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124 }
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125
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126 return series;
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127 }
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128
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129 public static StyledXYSeries sampleFunction2DPositive(
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130 Function func,
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131 ThemeDocument theme,
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132 String seriesKey,
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133 int samples,
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134 double start,
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135 double end
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136 ) {
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137 StyledXYSeries series = new StyledXYSeries(seriesKey, theme);
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138
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139 double step = (end - start) / (samples - 1);
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140
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141 for (int i = 0; i < samples; i++) {
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142 double x = start + (step * i);
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143 double v = func.value(x);
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144 if (x > 0d && v > 0d) {
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145 series.add(x, v);
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146 }
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147 }
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148
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149 return series;
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150 }
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151 }
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152 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org