Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/exports/InfoGeneratorHelper.java @ 657:ac1399d325e9
Removed asymmetrical "- 1" from width calculation.
flys-artifacts/trunk@2057 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Mon, 06 Jun 2011 11:34:44 +0000 |
parents | d4c4fefb095b |
children | ab43f36f4af6 |
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.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(createTransformationElement(cr, chart, info)); |
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62 |
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63 doc.appendChild(chartinfo); |
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64 |
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65 return doc; |
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66 } |
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67 |
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68 |
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69 /** |
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70 * This method appends the values of a transformation matrix to transform |
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71 * image pixel coordinates into chart coordinates. |
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72 * |
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73 * @param cr The ElementCreator. |
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74 * @param chart The chart object. |
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75 * @param info The ChartRenderingInfo that is filled while chart creation. |
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76 * |
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77 * @return an element that contains one or more transformation matrix. |
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78 */ |
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79 protected static Element createTransformationElement( |
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80 ElementCreator cr, |
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81 JFreeChart chart, |
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82 ChartRenderingInfo info) |
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83 { |
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84 logger.debug("InfoGeneratorHelper.createTransformationElement"); |
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85 |
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86 Element tf = cr.create("transformation-matrix"); |
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87 |
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88 Rectangle2D dataArea = info.getPlotInfo().getDataArea(); |
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89 |
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90 XYPlot plot = (XYPlot) chart.getPlot(); |
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91 ValueAxis xAxis = plot.getDomainAxis(); |
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92 ValueAxis yAxis = plot.getRangeAxis(); |
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93 |
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94 double[] tm = createTransformationMatrix(dataArea, xAxis, yAxis); |
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95 |
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96 cr.addAttr(tf, "sx", String.valueOf(tm[0]), true); |
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97 cr.addAttr(tf, "sy", String.valueOf(tm[1]), true); |
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98 cr.addAttr(tf, "tx", String.valueOf(tm[2]), true); |
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99 cr.addAttr(tf, "ty", String.valueOf(tm[3]), true); |
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100 |
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101 return tf; |
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102 } |
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103 |
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104 |
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105 /** |
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106 * This method determines a transformation matrix to transform pixel |
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107 * coordinates of the chart image into chart coordinates. |
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108 * |
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109 * @param dataArea The rectangle that contains the data points of the chart. |
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110 * @param xRange The x axis range. |
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111 * @param yRange The y axis range. |
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112 * |
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113 * @return a double array as follows: [sx, sy, tx, ty]. |
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114 */ |
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115 protected static double[] createTransformationMatrix( |
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116 Rectangle2D dataArea, |
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117 ValueAxis xAxis, |
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118 ValueAxis yAxis) |
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119 { |
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120 logger.debug("InfoGeneratorHelper.createTransformationMatrix"); |
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121 |
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122 double offsetX = dataArea.getX(); |
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123 double width = dataArea.getWidth(); |
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124 double offsetY = dataArea.getY(); |
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125 double height = dataArea.getHeight(); |
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126 |
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127 Range xRange = xAxis.getRange(); |
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128 Range yRange = yAxis.getRange(); |
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129 |
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130 double lowerX = xRange.getLowerBound(); |
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131 double upperX = xRange.getUpperBound(); |
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132 double lowerY = yRange.getLowerBound(); |
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133 double upperY = yRange.getUpperBound(); |
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134 |
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135 if (xAxis.isInverted()) { |
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136 logger.info("X-Axis is inverted!"); |
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137 |
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138 double tmp = upperX; |
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139 upperX = lowerX; |
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140 lowerX = tmp; |
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141 } |
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142 |
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143 double dMoveX = upperX - lowerX; |
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144 double fMoveX = width * lowerX; |
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145 double dMoveY = lowerY - upperY; |
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146 double fMoveY = height * upperY; |
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147 |
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148 AffineTransform t1 = AffineTransform.getTranslateInstance( |
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149 offsetX - ( fMoveX / dMoveX ), |
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150 offsetY - ( fMoveY / dMoveY ) ); |
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151 |
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152 AffineTransform t2 = AffineTransform.getScaleInstance( |
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153 width / (upperX - lowerX), |
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154 height / (lowerY - upperY)); |
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155 |
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156 t1.concatenate(t2); |
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157 |
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158 try { |
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159 t1.invert(); |
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160 |
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161 double[] c = new double[6]; |
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162 t1.getMatrix(c); |
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163 |
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164 return new double[] { c[0], c[3], c[4], c[5] }; |
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165 } |
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166 catch (NoninvertibleTransformException e) { |
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167 // do nothing |
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168 logger.warn("Matrix is not invertible."); |
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169 } |
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170 |
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171 return new double[] { 1d, 1d, 0d, 0d }; |
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172 } |
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173 } |
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174 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |