Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/InfoGeneratorHelper.java @ 657:ac1399d325e9

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Removed asymmetrical "- 1" from width calculation. flys-artifacts/trunk@2057 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
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 :
http://dive4elements.wald.intevation.org