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annotate flys-artifacts/src/main/java/de/intevation/flys/exports/XYChartGenerator.java @ 717:be4709640aac

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#90 Added a margin between chart data and chart axes to avoid displaying curves on the chart border. flys-artifacts/trunk@2190 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 21 Jun 2011 17:39:29 +0000
parents b22f21b173a7
children f3fd8c9b7f51
rev   line source
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1 package de.intevation.flys.exports;
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2
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3 import java.awt.BasicStroke;
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4 import java.awt.Color;
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5 import java.awt.Stroke;
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6
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7 import java.io.IOException;
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8
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9 import org.apache.log4j.Logger;
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10
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11 import org.jfree.chart.ChartFactory;
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12 import org.jfree.chart.JFreeChart;
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13 import org.jfree.chart.axis.NumberAxis;
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14 import org.jfree.chart.axis.ValueAxis;
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15 import org.jfree.chart.plot.PlotOrientation;
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16 import org.jfree.chart.plot.XYPlot;
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17 import org.jfree.data.Range;
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18 import org.jfree.data.xy.XYDataset;
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19
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20 import org.jfree.ui.RectangleInsets;
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21
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22 import de.intevation.flys.exports.ChartExportHelper;
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23
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24
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25 /**
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26 * An abstract base class for creating XY charts.
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27 *
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28 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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29 */
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30 public abstract class XYChartGenerator extends ChartGenerator {
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31
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32 /** The logger that is used in this generator.*/
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33 private static Logger logger = Logger.getLogger(XYChartGenerator.class);
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34
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35
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36 public static final Color DEFAULT_GRID_COLOR = Color.GRAY;
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37 public static final float DEFAULT_GRID_LINE_WIDTH = 0.3f;
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38
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39
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40 /**
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41 * Returns the title of a chart.
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42 *
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43 * @return the title of a chart.
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44 */
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45 protected abstract String getChartTitle();
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46
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47 /**
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48 * Returns the X-Axis label of a chart.
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49 *
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50 * @return the X-Axis label of a chart.
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51 */
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52 protected abstract String getXAxisLabel();
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53
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54 /**
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55 * Returns the Y-Axis label of a chart.
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56 *
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57 * @return the Y-Axis label of a chart.
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58 */
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59 protected abstract String getYAxisLabel();
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60
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61 /**
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62 * This method is called to add all datasets of a concrete XYChartGenerator
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63 * to the JFreeChart.
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64 *
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65 * @param chart The JFreeChart object.
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66 */
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67 protected abstract void addDatasets(JFreeChart chart);
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68
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69
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70 public void generate()
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71 throws IOException
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72 {
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73 logger.debug("XYChartGenerator.generate");
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74
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75 JFreeChart chart = generateChart();
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76
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77 int[] size = getSize();
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78
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79 ChartExportHelper.exportImage(
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80 out,
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81 chart,
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82 "png",
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83 size[0], size[1]);
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84 }
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85
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86
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87 public JFreeChart generateChart() {
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88 logger.debug("XYChartGenerator.generateChart");
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89
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90 JFreeChart chart = ChartFactory.createXYLineChart(
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91 getChartTitle(),
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92 getXAxisLabel(),
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93 getYAxisLabel(),
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94 null,
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95 PlotOrientation.VERTICAL,
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96 true,
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97 false,
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98 false);
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99
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100 chart.setBackgroundPaint(Color.WHITE);
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101 chart.getPlot().setBackgroundPaint(Color.WHITE);
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102
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103 XYPlot plot = (XYPlot) chart.getPlot();
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104
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105 addDatasets(chart);
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106 addSubtitles(chart);
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107 adjustPlot(plot);
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108 adjustAxes(plot);
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109 autoZoom(plot);
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110
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111 return chart;
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112 }
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113
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114
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115 /**
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116 * This method zooms the plot to the specified ranges in the attribute
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117 * document or to the ranges specified by the min/max values in the
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118 * datasets. <b>Note:</b> We determine the range manually if no zoom ranges
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119 * are given, because JFreeCharts auto-zoom adds a margin to the left and
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120 * right of the data area.
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121 *
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122 * @param plot The XYPlot.
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123 */
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124 protected void autoZoom(XYPlot plot) {
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125 logger.debug("Zoom to specified ranges.");
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126
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127 Range xrange = getDomainAxisRange();
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128 Range yrange = getValueAxisRange();
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129
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130 for (int i = 0, num = plot.getDatasetCount(); i < num; i++) {
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131 XYDataset dataset = plot.getDataset(i);
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132 Range[] ranges = getRangesForDataset(dataset);
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133
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134 if (i == 0) {
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135 ValueAxis xaxis = plot.getDomainAxis();
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136 zoom(plot, xaxis, ranges[0], xrange);
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137 }
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138
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139 ValueAxis yaxis = plot.getRangeAxis(i);
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140
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141 if (yaxis == null) {
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142 continue;
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143 }
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144
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145 zoom(plot, yaxis, ranges[1], yrange);
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146 }
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147 }
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148
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149
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150 /**
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151 * Zooms the x axis to the range specified in the attribute document.
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152 *
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153 * @param plot The XYPlot.
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154 * @param axis The axis the shoud be modified.
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155 * @param range The whole range specified by a dataset.
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156 * @param x A user defined range (null permitted).
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157 *
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158 * @return true, if a zoom range was specified, otherwise false.
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159 */
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160 protected boolean zoom(XYPlot plot, ValueAxis axis, Range range, Range x) {
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161 if (x != null) {
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162 double min = range.getLowerBound();
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163 double max = range.getUpperBound();
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164 double diff = max > min ? max - min : min - max;
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165
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166 Range computed = new Range(
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167 min + x.getLowerBound() * diff,
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168 min + x.getUpperBound() * diff);
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169
717
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170 axis.setRangeWithMargins(computed);
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171
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172 logger.debug("Zoom axis to: " + computed);
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173
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174 return true;
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175 }
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176
717
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177 axis.setRangeWithMargins(range);
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178 return false;
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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 * This method extracts the minimum and maximum values for x and y axes.
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184 *
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185 * @param dataset The dataset that should be observed.
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186 *
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187 * @return a Range[] as follows: [x-Range, y-Range].
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188 */
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189 public static Range[] getRangesForDataset(XYDataset dataset) {
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190 double[] xr = new double[] { Double.MAX_VALUE, -Double.MAX_VALUE };
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191 double[] yr = new double[] { Double.MAX_VALUE, -Double.MAX_VALUE };
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192
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193 int sCount = dataset.getSeriesCount();
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194
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195 for (int i = 0; i < sCount; i++) {
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196 int iCount = dataset.getItemCount(i);
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197
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198 for (int j = 0; j < iCount; j++) {
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199 double x = dataset.getX(i, j).doubleValue();
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200 double y = dataset.getY(i, j).doubleValue();
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201
667
434146596838 Made the chart range determination more robust against NaN values.
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202 if (!Double.isNaN(x)) {
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203 xr[0] = xr[0] < x ? xr[0] : x;
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204 xr[1] = xr[1] > x ? xr[1] : x;
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205 }
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206
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207 if (!Double.isNaN(y)) {
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208 yr[0] = yr[0] < y ? yr[0] : y;
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209 yr[1] = yr[1] > y ? yr[1] : y;
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210 }
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211 }
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212 }
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213
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214 // this is only required, if there are no items in the dataset.
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215 xr[0] = xr[0] < xr[1] ? xr[0] : xr[1];
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216 xr[1] = xr[1] > xr[0] ? xr[1] : xr[0];
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217 yr[0] = yr[0] < yr[1] ? yr[0] : yr[1];
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218 yr[1] = yr[1] > yr[0] ? yr[1] : yr[0];
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219
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220 return new Range[] {new Range(xr[0], xr[1]), new Range(yr[0], yr[1])};
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221 }
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222
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223
369
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224 /**
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225 * Adjusts the axes of a plot.
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226 *
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227 * @param plot The XYPlot of the chart.
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228 */
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229 protected void adjustAxes(XYPlot plot) {
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230 NumberAxis yAxis = (NumberAxis) plot.getRangeAxis();
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231
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232 yAxis.setAutoRangeIncludesZero(false);
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233 }
414
0385bcc4229a Added subtitles to the available charts.
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234
0385bcc4229a Added subtitles to the available charts.
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235
419
4de7d9eac10f Display gridlines in charts.
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236 protected void adjustPlot(XYPlot plot) {
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237 Stroke gridStroke = new BasicStroke(
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238 DEFAULT_GRID_LINE_WIDTH,
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239 BasicStroke.CAP_BUTT,
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240 BasicStroke.JOIN_MITER,
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241 3.0f,
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242 new float[] { 3.0f },
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243 0.0f);
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244
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245 plot.setDomainGridlineStroke(gridStroke);
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246 plot.setDomainGridlinePaint(DEFAULT_GRID_COLOR);
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247 plot.setDomainGridlinesVisible(true);
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248
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249 plot.setRangeGridlineStroke(gridStroke);
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250 plot.setRangeGridlinePaint(DEFAULT_GRID_COLOR);
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251 plot.setRangeGridlinesVisible(true);
654
bbc966c81809 #90 Removed margins between data area border and curves.
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252
bbc966c81809 #90 Removed margins between data area border and curves.
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253 plot.setAxisOffset(new RectangleInsets(0d, 0d, 0d, 0d));
419
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254 }
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255
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256
414
0385bcc4229a Added subtitles to the available charts.
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257 protected void addSubtitles(JFreeChart chart) {
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258 // override this method in subclasses that need subtitles
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259 }
369
2ce7b473620e Implemented the chart creation of a longitudinal section chart - W and Q facets.
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260 }
2ce7b473620e Implemented the chart creation of a longitudinal section chart - W and Q facets.
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261 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org