Mercurial > dive4elements > river
comparison flys-artifacts/src/main/java/de/intevation/flys/exports/InfoGeneratorHelper.java @ 647:bb484489d3df
Introduced a new output generators for creating chart info documents.
flys-artifacts/trunk@2032 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
|---|---|
| date | Wed, 01 Jun 2011 08:01:07 +0000 |
| parents | |
| children | d4c4fefb095b |
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| 646:d299e220d89c | 647:bb484489d3df |
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| 1 package de.intevation.flys.exports; | |
| 2 | |
| 3 import java.awt.geom.AffineTransform; | |
| 4 import java.awt.geom.NoninvertibleTransformException; | |
| 5 import java.awt.geom.Rectangle2D; | |
| 6 | |
| 7 import org.w3c.dom.Document; | |
| 8 import org.w3c.dom.Element; | |
| 9 | |
| 10 import org.apache.log4j.Logger; | |
| 11 | |
| 12 import org.jfree.chart.ChartRenderingInfo; | |
| 13 import org.jfree.chart.JFreeChart; | |
| 14 import org.jfree.chart.plot.XYPlot; | |
| 15 import org.jfree.data.Range; | |
| 16 | |
| 17 import de.intevation.artifacts.common.ArtifactNamespaceContext; | |
| 18 import de.intevation.artifacts.common.utils.XMLUtils; | |
| 19 import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator; | |
| 20 | |
| 21 | |
| 22 /** | |
| 23 * This class helps generating chart info documents. | |
| 24 * | |
| 25 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> | |
| 26 */ | |
| 27 public class InfoGeneratorHelper { | |
| 28 | |
| 29 private static final Logger logger = | |
| 30 Logger.getLogger(InfoGeneratorHelper.class); | |
| 31 | |
| 32 | |
| 33 private InfoGeneratorHelper() { | |
| 34 } | |
| 35 | |
| 36 | |
| 37 /** | |
| 38 * Triggers the creation of the chart info document. | |
| 39 * | |
| 40 * @param chart The JFreeChart chart. | |
| 41 * @param info An info object that has been created while chart creation. | |
| 42 * | |
| 43 * @return the info document. | |
| 44 */ | |
| 45 public static Document createInfoDocument( | |
| 46 JFreeChart chart, | |
| 47 ChartRenderingInfo info) | |
| 48 { | |
| 49 logger.debug("InfoGeneratorHelper.createInfoDocument"); | |
| 50 | |
| 51 Document doc = XMLUtils.newDocument(); | |
| 52 | |
| 53 ElementCreator cr = new ElementCreator( | |
| 54 doc, | |
| 55 ArtifactNamespaceContext.NAMESPACE_URI, | |
| 56 ArtifactNamespaceContext.NAMESPACE_PREFIX); | |
| 57 | |
| 58 Element chartinfo = cr.create("chartinfo"); | |
| 59 | |
| 60 chartinfo.appendChild(createTransformationElement(cr, chart, info)); | |
| 61 | |
| 62 doc.appendChild(chartinfo); | |
| 63 | |
| 64 return doc; | |
| 65 } | |
| 66 | |
| 67 | |
| 68 /** | |
| 69 * This method appends the values of a transformation matrix to transform | |
| 70 * image pixel coordinates into chart coordinates. | |
| 71 * | |
| 72 * @param cr The ElementCreator. | |
| 73 * @param chart The chart object. | |
| 74 * @param info The ChartRenderingInfo that is filled while chart creation. | |
| 75 * | |
| 76 * @return an element that contains one or more transformation matrix. | |
| 77 */ | |
| 78 protected static Element createTransformationElement( | |
| 79 ElementCreator cr, | |
| 80 JFreeChart chart, | |
| 81 ChartRenderingInfo info) | |
| 82 { | |
| 83 logger.debug("InfoGeneratorHelper.createTransformationElement"); | |
| 84 | |
| 85 Element tf = cr.create("transformation-matrix"); | |
| 86 | |
| 87 Rectangle2D dataArea = info.getPlotInfo().getDataArea(); | |
| 88 | |
| 89 XYPlot plot = (XYPlot) chart.getPlot(); | |
| 90 Range xRange = plot.getDomainAxis().getRange(); | |
| 91 Range yRange = plot.getRangeAxis().getRange(); | |
| 92 | |
| 93 double[] tm = createTransformationMatrix(dataArea, xRange, yRange); | |
| 94 | |
| 95 cr.addAttr(tf, "sx", String.valueOf(tm[0]), true); | |
| 96 cr.addAttr(tf, "sy", String.valueOf(tm[1]), true); | |
| 97 cr.addAttr(tf, "tx", String.valueOf(tm[2]), true); | |
| 98 cr.addAttr(tf, "ty", String.valueOf(tm[3]), true); | |
| 99 | |
| 100 return tf; | |
| 101 } | |
| 102 | |
| 103 | |
| 104 /** | |
| 105 * This method determines a transformation matrix to transform pixel | |
| 106 * coordinates of the chart image into chart coordinates. | |
| 107 * | |
| 108 * @param dataArea The rectangle that contains the data points of the chart. | |
| 109 * @param xRange The x axis range. | |
| 110 * @param yRange The y axis range. | |
| 111 * | |
| 112 * @return a double array as follows: [sx, sy, tx, ty]. | |
| 113 */ | |
| 114 protected static double[] createTransformationMatrix( | |
| 115 Rectangle2D dataArea, | |
| 116 Range xRange, | |
| 117 Range yRange) | |
| 118 { | |
| 119 double offsetX = dataArea.getX(); | |
| 120 double width = dataArea.getWidth() - 1; | |
| 121 double offsetY = dataArea.getY(); | |
| 122 double height = dataArea.getHeight(); | |
| 123 | |
| 124 double lowerX = xRange.getLowerBound(); | |
| 125 double upperX = xRange.getUpperBound(); | |
| 126 double lowerY = yRange.getLowerBound(); | |
| 127 double upperY = yRange.getUpperBound(); | |
| 128 | |
| 129 double dMoveX = upperX - lowerX; | |
| 130 double fMoveX = width * lowerX; | |
| 131 double dMoveY = lowerY - upperY; | |
| 132 double fMoveY = height * upperY; | |
| 133 | |
| 134 AffineTransform t1 = AffineTransform.getTranslateInstance( | |
| 135 offsetX - ( fMoveX / dMoveX ), | |
| 136 offsetY - ( fMoveY / dMoveY ) ); | |
| 137 | |
| 138 AffineTransform t2 = AffineTransform.getScaleInstance( | |
| 139 width / (upperX - lowerX), | |
| 140 height / (lowerY - upperY)); | |
| 141 | |
| 142 t1.concatenate(t2); | |
| 143 | |
| 144 try { | |
| 145 t1.invert(); | |
| 146 | |
| 147 double[] c = new double[6]; | |
| 148 t1.getMatrix(c); | |
| 149 | |
| 150 return new double[] { c[0], c[3], c[4], c[5] }; | |
| 151 } | |
| 152 catch (NoninvertibleTransformException e) { | |
| 153 // do nothing | |
| 154 logger.warn("Matrix is not invertible."); | |
| 155 } | |
| 156 | |
| 157 return new double[] { 1d, 1d, 0d, 0d }; | |
| 158 } | |
| 159 } | |
| 160 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |