Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/exports/InfoGeneratorHelper.java @ 666:eb45e05e5c5b
Set the second y axis to axis position 1 (starts at 0).
flys-artifacts/trunk@2079 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Wed, 08 Jun 2011 12:35:44 +0000 |
parents | 51172d56e8bc |
children | b22f21b173a7 |
rev | line source |
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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 org.w3c.dom.Document; |
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8 import org.w3c.dom.Element; |
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9 |
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10 import org.apache.log4j.Logger; |
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11 |
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12 import org.jfree.chart.ChartRenderingInfo; |
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13 import org.jfree.chart.JFreeChart; |
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14 import org.jfree.chart.axis.ValueAxis; |
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15 import org.jfree.chart.plot.XYPlot; |
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16 import org.jfree.data.Range; |
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17 |
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18 import de.intevation.artifacts.common.ArtifactNamespaceContext; |
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19 import de.intevation.artifacts.common.utils.XMLUtils; |
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20 import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator; |
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21 |
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22 |
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23 /** |
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24 * This class helps generating chart info documents. |
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25 * |
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26 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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27 */ |
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28 public class InfoGeneratorHelper { |
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29 |
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30 private static final Logger logger = |
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31 Logger.getLogger(InfoGeneratorHelper.class); |
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32 |
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33 |
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34 private InfoGeneratorHelper() { |
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35 } |
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36 |
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37 |
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38 /** |
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39 * Triggers the creation of the chart info document. |
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40 * |
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41 * @param chart The JFreeChart chart. |
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42 * @param info An info object that has been created while chart creation. |
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43 * |
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44 * @return the info document. |
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45 */ |
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46 public static Document createInfoDocument( |
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47 JFreeChart chart, |
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48 ChartRenderingInfo info) |
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49 { |
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50 logger.debug("InfoGeneratorHelper.createInfoDocument"); |
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51 |
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52 Document doc = XMLUtils.newDocument(); |
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53 |
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54 ElementCreator cr = new ElementCreator( |
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55 doc, |
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56 ArtifactNamespaceContext.NAMESPACE_URI, |
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57 ArtifactNamespaceContext.NAMESPACE_PREFIX); |
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58 |
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59 Element chartinfo = cr.create("chartinfo"); |
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60 |
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61 chartinfo.appendChild(createAxesElements(cr, chart)); |
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62 chartinfo.appendChild(createTransformationElement(cr, chart, info)); |
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63 |
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64 doc.appendChild(chartinfo); |
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65 |
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66 return doc; |
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67 } |
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68 |
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69 |
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70 /** |
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71 * This method create a axes element that contains all domain and range |
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72 * axes of the given chart. |
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73 * |
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74 * @param cr The ElementCreator. |
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75 * @param chart The chart that provides range information of its axes. |
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76 * |
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77 * @return an element with axes information. |
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78 */ |
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79 protected static Element createAxesElements( |
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80 ElementCreator cr, |
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81 JFreeChart chart) |
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82 { |
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83 logger.debug("InfoGeneratorHelper.createRangeElements"); |
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84 |
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85 Element axes = cr.create("axes"); |
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86 |
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87 XYPlot plot = (XYPlot) chart.getPlot(); |
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88 |
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89 int dAxisCount = plot.getDomainAxisCount(); |
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90 for (int i = 0; i < dAxisCount; i++) { |
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91 ValueAxis axis = plot.getDomainAxis(i); |
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92 if (axis != null) { |
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93 Element e = createAxisElement(cr, axis, "domain", i); |
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94 axes.appendChild(e); |
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95 } |
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96 } |
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97 |
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98 int rAxisCount = plot.getRangeAxisCount(); |
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99 for (int i = 0; i < rAxisCount; i++) { |
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100 ValueAxis axis = plot.getRangeAxis(i); |
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101 if (axis != null) { |
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102 Element e = createAxisElement(cr, axis, "range", i); |
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103 axes.appendChild(e); |
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104 } |
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105 } |
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106 |
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107 return axes; |
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108 } |
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109 |
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110 |
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111 /** |
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112 * This method create a axis element for a given <i>axis</i> and |
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113 * <i>type</i>. Type can be one of 'domain' or 'range'. |
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114 * |
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115 * @param cr The ElementCreator |
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116 * @param axis The axis that provides range information. |
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117 * @param type The axis type ('domain' or 'range'). |
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118 * @param pos The position in the chart. |
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119 * |
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120 * @return An element that contains range information of a given axis. |
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121 */ |
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122 protected static Element createAxisElement( |
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123 ElementCreator cr, |
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124 ValueAxis axis, |
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125 String type, |
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126 int pos) |
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127 { |
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128 Range range = axis.getRange(); |
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129 |
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130 Element e = cr.create(type); |
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131 cr.addAttr(e, "pos", String.valueOf(pos), true); |
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132 cr.addAttr(e, "from", String.valueOf(range.getLowerBound()), true); |
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133 cr.addAttr(e, "to", String.valueOf(range.getUpperBound()), true); |
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134 |
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135 return e; |
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136 } |
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137 |
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138 |
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139 /** |
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140 * This method appends the values of a transformation matrix to transform |
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141 * image pixel coordinates into chart coordinates. |
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142 * |
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143 * @param cr The ElementCreator. |
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144 * @param chart The chart object. |
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145 * @param info The ChartRenderingInfo that is filled while chart creation. |
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146 * |
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147 * @return an element that contains one or more transformation matrix. |
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148 */ |
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149 protected static Element createTransformationElement( |
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150 ElementCreator cr, |
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151 JFreeChart chart, |
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152 ChartRenderingInfo info) |
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153 { |
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154 logger.debug("InfoGeneratorHelper.createTransformationElement"); |
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155 |
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156 Element tf = cr.create("transformation-matrix"); |
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157 |
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158 Rectangle2D dataArea = info.getPlotInfo().getDataArea(); |
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159 |
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160 XYPlot plot = (XYPlot) chart.getPlot(); |
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161 ValueAxis xAxis = plot.getDomainAxis(); |
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162 ValueAxis yAxis = plot.getRangeAxis(); |
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163 |
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164 double[] tm = createTransformationMatrix(dataArea, xAxis, yAxis); |
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165 |
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166 cr.addAttr(tf, "sx", String.valueOf(tm[0]), true); |
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167 cr.addAttr(tf, "sy", String.valueOf(tm[1]), true); |
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168 cr.addAttr(tf, "tx", String.valueOf(tm[2]), true); |
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169 cr.addAttr(tf, "ty", String.valueOf(tm[3]), true); |
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170 |
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171 return tf; |
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172 } |
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173 |
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174 |
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175 /** |
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176 * This method determines a transformation matrix to transform pixel |
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177 * coordinates of the chart image into chart coordinates. |
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178 * |
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179 * @param dataArea The rectangle that contains the data points of the chart. |
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180 * @param xRange The x axis range. |
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181 * @param yRange The y axis range. |
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182 * |
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183 * @return a double array as follows: [sx, sy, tx, ty]. |
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184 */ |
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185 protected static double[] createTransformationMatrix( |
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186 Rectangle2D dataArea, |
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187 ValueAxis xAxis, |
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188 ValueAxis yAxis) |
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189 { |
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190 logger.debug("InfoGeneratorHelper.createTransformationMatrix"); |
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191 |
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192 double offsetX = dataArea.getX(); |
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193 double width = dataArea.getWidth(); |
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194 double offsetY = dataArea.getY(); |
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195 double height = dataArea.getHeight(); |
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196 |
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197 Range xRange = xAxis.getRange(); |
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198 Range yRange = yAxis.getRange(); |
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199 |
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200 double lowerX = xRange.getLowerBound(); |
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201 double upperX = xRange.getUpperBound(); |
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202 double lowerY = yRange.getLowerBound(); |
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203 double upperY = yRange.getUpperBound(); |
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204 |
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205 if (xAxis.isInverted()) { |
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206 logger.info("X-Axis is inverted!"); |
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207 |
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208 double tmp = upperX; |
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209 upperX = lowerX; |
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210 lowerX = tmp; |
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211 } |
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212 |
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213 double dMoveX = upperX - lowerX; |
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214 double fMoveX = width * lowerX; |
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215 double dMoveY = lowerY - upperY; |
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216 double fMoveY = height * upperY; |
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217 |
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218 AffineTransform t1 = AffineTransform.getTranslateInstance( |
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219 offsetX - ( fMoveX / dMoveX ), |
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220 offsetY - ( fMoveY / dMoveY ) ); |
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221 |
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222 AffineTransform t2 = AffineTransform.getScaleInstance( |
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223 width / (upperX - lowerX), |
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224 height / (lowerY - upperY)); |
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225 |
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226 t1.concatenate(t2); |
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227 |
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228 try { |
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229 t1.invert(); |
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230 |
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231 double[] c = new double[6]; |
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232 t1.getMatrix(c); |
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233 |
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234 return new double[] { c[0], c[3], c[4], c[5] }; |
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235 } |
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236 catch (NoninvertibleTransformException e) { |
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237 // do nothing |
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238 logger.warn("Matrix is not invertible."); |
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239 } |
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240 |
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241 return new double[] { 1d, 1d, 0d, 0d }; |
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242 } |
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243 } |
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244 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |