Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/exports/XYChartGenerator.java @ 710:cded0924193d
Added generator and facet for error reports.
flys-artifacts/trunk@2166 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Mon, 20 Jun 2011 13:47:59 +0000 |
parents | b22f21b173a7 |
children | be4709640aac |
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 |
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170 axis.setRange(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 |
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177 axis.setRange(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 |
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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])}; |
652
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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
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234 |
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235 |
419
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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); |
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252 |
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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
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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
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260 } |
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261 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |