Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/InfoGeneratorHelper.java @ 2273:7b8d59436be3

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Set proper bounds for date axes in the chart info document; tell the transformation matrix which type it is (date/number). flys-artifacts/trunk@3930 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Mon, 06 Feb 2012 14:37:30 +0000
parents 6aeb71517136
children 594885703687
rev   line source
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bb484489d3df Introduced a new output generators for creating chart info documents.
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1 package de.intevation.flys.exports;
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2
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3 import java.awt.geom.AffineTransform;
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4 import java.awt.geom.NoninvertibleTransformException;
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5 import java.awt.geom.Rectangle2D;
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6
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7 import java.util.Date;
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8
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9 import org.w3c.dom.Document;
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10 import org.w3c.dom.Element;
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11
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12 import org.apache.log4j.Logger;
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13
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14 import org.jfree.chart.ChartRenderingInfo;
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15 import org.jfree.chart.JFreeChart;
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16 import org.jfree.chart.axis.DateAxis;
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17 import org.jfree.chart.axis.NumberAxis;
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d4c4fefb095b The matrix that is used to transform chart image coordinates into chart coordinates supports inverted x-axis now.
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18 import org.jfree.chart.axis.ValueAxis;
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19 import org.jfree.chart.plot.XYPlot;
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20 import org.jfree.data.Range;
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21 import org.jfree.data.xy.XYDataset;
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22
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23 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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24 import de.intevation.artifacts.common.utils.XMLUtils;
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25 import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
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26
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27
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28 /**
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29 * This class helps generating chart info documents.
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30 *
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31 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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32 */
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33 public class InfoGeneratorHelper {
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34
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35 private static final Logger logger =
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36 Logger.getLogger(InfoGeneratorHelper.class);
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37
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38
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39 protected ChartGenerator generator;
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40
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41
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6aeb71517136 Registered an Info generator for historical discharge curves; made some adaptions in XYChartGenerator, ChartGenerator and TimeseriesChartGenerator.
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42 public InfoGeneratorHelper(ChartGenerator generator) {
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43 this.generator = generator;
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44 }
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45
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46
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47 /**
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48 * Triggers the creation of the chart info document.
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49 *
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50 * @param chart The JFreeChart chart.
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51 * @param info An info object that has been created while chart creation.
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52 *
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53 * @return the info document.
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54 */
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55 public Document createInfoDocument(
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56 JFreeChart chart,
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57 ChartRenderingInfo info)
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58 {
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59 logger.debug("InfoGeneratorHelper.createInfoDocument");
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60
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61 Document doc = XMLUtils.newDocument();
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62
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63 ElementCreator cr = new ElementCreator(
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64 doc,
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65 ArtifactNamespaceContext.NAMESPACE_URI,
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66 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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67
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68 Element chartinfo = cr.create("chartinfo");
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69
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70 chartinfo.appendChild(createAxesElements(cr, chart));
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71 chartinfo.appendChild(createTransformationElements(cr, chart, info));
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72
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73 doc.appendChild(chartinfo);
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74
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75 return doc;
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76 }
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77
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78
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79 /**
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80 * This method create a axes element that contains all domain and range
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81 * axes of the given chart.
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82 *
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83 * @param cr The ElementCreator.
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84 * @param chart The chart that provides range information of its axes.
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85 *
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86 * @return an element with axes information.
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87 */
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88 protected Element createAxesElements(
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89 ElementCreator cr,
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90 JFreeChart chart)
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91 {
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92 logger.debug("InfoGeneratorHelper.createRangeElements");
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93
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94 Element axes = cr.create("axes");
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95
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96 XYPlot plot = (XYPlot) chart.getPlot();
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97
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98 int dAxisCount = plot.getDomainAxisCount();
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99 for (int i = 0; i < dAxisCount; i++) {
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100 ValueAxis axis = plot.getDomainAxis(i);
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101 XYDataset data = plot.getDataset(i);
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102
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103 if (axis != null) {
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104 Element e = createAxisElement(cr, axis, data, "domain", i);
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105 axes.appendChild(e);
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106 }
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107 }
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108
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109 int rAxisCount = plot.getRangeAxisCount();
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110 for (int i = 0; i < rAxisCount; i++) {
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111 ValueAxis axis = plot.getRangeAxis(i);
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112 XYDataset data = plot.getDataset(i);
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113
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114 if (axis == null || data == null) {
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115 logger.warn("Axis or dataset is empty at pos: " + i);
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116 continue;
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117 }
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118
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119 Element e = createAxisElement(cr, axis, data, "range", i);
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120 axes.appendChild(e);
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121 }
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122
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123 return axes;
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124 }
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125
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126
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127 /**
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128 * This method create a axis element for a given <i>axis</i> and
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129 * <i>type</i>. Type can be one of 'domain' or 'range'.
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130 *
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131 * @param cr The ElementCreator
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132 * @param axis The axis that provides range information.
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133 * @param dataset The dataset for min/max determination.
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134 * @param type The axis type ('domain' or 'range').
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135 * @param pos The position in the chart.
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136 *
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137 * @return An element that contains range information of a given axis.
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138 */
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139 protected Element createAxisElement(
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140 ElementCreator cr,
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141 ValueAxis axis,
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142 XYDataset dataset,
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143 String type,
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144 int pos)
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145 {
1944
21a4d2c677a1 Changed doOut signature, side effect from blackboard feature (to come).
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146 logger.debug("createAxisElement " + pos);
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147 logger.debug("Axis is from type: " + axis.getClass());
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148
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149 Element e = cr.create(type);
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150 cr.addAttr(e, "pos", String.valueOf(pos), true);
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151
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152 if (axis instanceof DateAxis) {
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153 prepareDateAxisElement(
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154 e, cr, (DateAxis) axis, dataset, type, pos);
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155 }
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156 else {
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157 prepareNumberAxisElement(
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158 e, cr, (NumberAxis) axis, dataset, type, pos);
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159 }
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160
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161 return e;
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162 }
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163
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164
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165 protected Element prepareNumberAxisElement(
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166 Element e,
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167 ElementCreator cr,
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168 NumberAxis axis,
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169 XYDataset dataset,
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170 String type,
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171 int pos
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172 ) {
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173 Range range = axis.getRange();
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174
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175 cr.addAttr(e, "from", String.valueOf(range.getLowerBound()), true);
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176 cr.addAttr(e, "to", String.valueOf(range.getUpperBound()), true);
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177 cr.addAttr(e, "axistype", "number", true);
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178
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179 Range[] rs = generator.getRangesForAxis(pos);
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180 Range r = null;
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181
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182 if (type.equals("range")) {
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183 r = rs[1];
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184 }
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185 else {
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186 r = rs[0];
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187 }
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188
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189 cr.addAttr(e, "min", String.valueOf(r.getLowerBound()), true);
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190 cr.addAttr(e, "max", String.valueOf(r.getUpperBound()), true);
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191
659
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192 return e;
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193 }
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194
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195
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196 protected Element prepareDateAxisElement(
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197 Element e,
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198 ElementCreator cr,
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199 DateAxis axis,
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200 XYDataset dataset,
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201 String type,
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202 int pos
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203 ) {
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204 Date from = axis.getMinimumDate();
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205 Date to = axis.getMaximumDate();
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206
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207 cr.addAttr(e, "axistype", "date", true);
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208 cr.addAttr(e, "from", String.valueOf(from.getTime()), true);
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209 cr.addAttr(e, "to", String.valueOf(to.getTime()), true);
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210
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211 // TODO Get correct min/max
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212 cr.addAttr(e, "min", String.valueOf(from.getTime()), true);
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213 cr.addAttr(e, "max", String.valueOf(to.getTime()), true);
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214
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215 return e;
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216 }
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217
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218
659
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219 /**
647
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220 * This method appends the values of a transformation matrix to transform
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221 * image pixel coordinates into chart coordinates.
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222 *
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223 * @param cr The ElementCreator.
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224 * @param chart The chart object.
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225 * @param info The ChartRenderingInfo that is filled while chart creation.
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226 *
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227 * @return an element that contains one or more transformation matrix.
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228 */
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229 protected Element createTransformationElements(
647
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230 ElementCreator cr,
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231 JFreeChart chart,
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232 ChartRenderingInfo info)
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233 {
673
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234 logger.debug("InfoGeneratorHelper.createTransformationElements");
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235
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236 Element tf = cr.create("transformation-matrix");
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237
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238 Rectangle2D dataArea = info.getPlotInfo().getDataArea();
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239
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240 XYPlot plot = (XYPlot) chart.getPlot();
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241 ValueAxis xAxis = plot.getDomainAxis();
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242
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243 if (xAxis == null) {
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244 logger.error("There is no x axis in the chart!");
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245 return null;
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246 }
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247
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248 for (int i = 0, num = plot.getRangeAxisCount(); i < num; i++) {
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249 ValueAxis yAxis = plot.getRangeAxis(i);
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250
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251 if (yAxis == null) {
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252 logger.warn("No y axis at pos " + i + " existing.");
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253 continue;
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254 }
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255
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256 Element matrix = createTransformationElement(
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257 cr, xAxis, yAxis, dataArea, i);
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258
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259 tf.appendChild(matrix);
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260 }
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261
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262 return tf;
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263 }
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264
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265
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266 /**
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267 * Creates an element that contains values used to transform coordinates
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268 * of a coordinate system A into a coordinate system B.
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269 *
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270 * @param cr The ElementCreator.
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271 * @param xAxis The x axis of the target coordinate system.
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272 * @param yAxis The y axis of the target coordinate system.
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273 * @param dataArea The pixel coordinates of the chart image.
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274 * @param pos The dataset position.
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275 *
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276 * @return an element that contains transformation matrix values.
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277 */
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278 protected Element createTransformationElement(
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279 ElementCreator cr,
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280 ValueAxis xAxis,
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281 ValueAxis yAxis,
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282 Rectangle2D dataArea,
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283 int pos)
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284 {
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285 double[] tm = createTransformationMatrix(dataArea, xAxis, yAxis);
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286
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287 Element matrix = cr.create("matrix");
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288
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289 cr.addAttr(matrix, "pos", String.valueOf(pos), true);
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290 cr.addAttr(matrix, "sx", String.valueOf(tm[0]), true);
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291 cr.addAttr(matrix, "sy", String.valueOf(tm[1]), true);
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292 cr.addAttr(matrix, "tx", String.valueOf(tm[2]), true);
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293 cr.addAttr(matrix, "ty", String.valueOf(tm[3]), true);
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294
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295 if (xAxis instanceof DateAxis) {
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296 cr.addAttr(matrix, "xtype", "date", true);
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297 }
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298 else {
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299 cr.addAttr(matrix, "xtype", "number", true);
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300 }
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301
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302 if (yAxis instanceof DateAxis) {
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303 cr.addAttr(matrix, "ytype", "date", true);
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304 }
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305 else {
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306 cr.addAttr(matrix, "ytype", "number", true);
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307 }
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308
673
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309 return matrix;
647
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310 }
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311
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312
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313 /**
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314 * This method determines a transformation matrix to transform pixel
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315 * coordinates of the chart image into chart coordinates.
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316 *
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317 * @param dataArea The rectangle that contains the data points of the chart.
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318 * @param xRange The x axis range.
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319 * @param yRange The y axis range.
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320 *
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321 * @return a double array as follows: [sx, sy, tx, ty].
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322 */
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323 protected static double[] createTransformationMatrix(
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324 Rectangle2D dataArea,
648
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325 ValueAxis xAxis,
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326 ValueAxis yAxis)
647
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327 {
648
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328 logger.debug("InfoGeneratorHelper.createTransformationMatrix");
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329
647
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330 double offsetX = dataArea.getX();
657
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331 double width = dataArea.getWidth();
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332 double offsetY = dataArea.getY();
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333 double height = dataArea.getHeight();
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334
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335 Range xRange = getRangeFromAxis(xAxis);
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336 Range yRange = getRangeFromAxis(yAxis);
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337
647
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338 double lowerX = xRange.getLowerBound();
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339 double upperX = xRange.getUpperBound();
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340 double lowerY = yRange.getLowerBound();
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341 double upperY = yRange.getUpperBound();
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342
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343 if (xAxis.isInverted()) {
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344 logger.info("X-Axis is inverted!");
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345
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346 double tmp = upperX;
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347 upperX = lowerX;
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348 lowerX = tmp;
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349 }
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350
647
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351 double dMoveX = upperX - lowerX;
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352 double fMoveX = width * lowerX;
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353 double dMoveY = lowerY - upperY;
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354 double fMoveY = height * upperY;
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355
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356 AffineTransform t1 = AffineTransform.getTranslateInstance(
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357 offsetX - ( fMoveX / dMoveX ),
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358 offsetY - ( fMoveY / dMoveY ) );
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359
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360 AffineTransform t2 = AffineTransform.getScaleInstance(
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361 width / (upperX - lowerX),
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362 height / (lowerY - upperY));
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363
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364 t1.concatenate(t2);
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365
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366 try {
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367 t1.invert();
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368
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369 double[] c = new double[6];
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370 t1.getMatrix(c);
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371
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372 return new double[] { c[0], c[3], c[4], c[5] };
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373 }
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374 catch (NoninvertibleTransformException e) {
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375 // do nothing
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376 logger.warn("Matrix is not invertible.");
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377 }
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378
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379 return new double[] { 1d, 1d, 0d, 0d };
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380 }
2273
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381
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382
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383 protected static Range getRangeFromAxis(ValueAxis axis) {
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384 if (axis instanceof DateAxis) {
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385 DateAxis dAxis = (DateAxis) axis;
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386 Date min = dAxis.getMinimumDate();
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387 Date max = dAxis.getMaximumDate();
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388
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389 return new Range(min.getTime(), max.getTime());
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390 }
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391 else {
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392 return axis.getRange();
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393 }
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394 }
647
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395 }
bb484489d3df Introduced a new output generators for creating chart info documents.
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396 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org