Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/InfoGeneratorHelper.java @ 1944:21a4d2c677a1

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Changed doOut signature, side effect from blackboard feature (to come). flys-artifacts/trunk@3334 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Wed, 30 Nov 2011 10:10:42 +0000
parents bdb05dc9b763
children 6aeb71517136
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 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 import org.jfree.data.xy.XYDataset;
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18
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19 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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20 import de.intevation.artifacts.common.utils.XMLUtils;
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21 import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
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22
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23
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24 /**
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25 * This class helps generating chart info documents.
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26 *
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27 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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28 */
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29 public class InfoGeneratorHelper {
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30
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31 private static final Logger logger =
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32 Logger.getLogger(InfoGeneratorHelper.class);
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33
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34
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35 protected XYChartGenerator generator;
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36
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37
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38 public InfoGeneratorHelper(XYChartGenerator generator) {
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39 this.generator = generator;
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40 }
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41
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42
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43 /**
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44 * Triggers the creation of the chart info document.
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45 *
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46 * @param chart The JFreeChart chart.
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47 * @param info An info object that has been created while chart creation.
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48 *
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49 * @return the info document.
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50 */
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51 public Document createInfoDocument(
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52 JFreeChart chart,
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53 ChartRenderingInfo info)
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54 {
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55 logger.debug("InfoGeneratorHelper.createInfoDocument");
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56
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57 Document doc = XMLUtils.newDocument();
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58
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59 ElementCreator cr = new ElementCreator(
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60 doc,
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61 ArtifactNamespaceContext.NAMESPACE_URI,
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62 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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63
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64 Element chartinfo = cr.create("chartinfo");
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65
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66 chartinfo.appendChild(createAxesElements(cr, chart));
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67 chartinfo.appendChild(createTransformationElements(cr, chart, info));
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68
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69 doc.appendChild(chartinfo);
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70
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71 return doc;
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72 }
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73
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74
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75 /**
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76 * This method create a axes element that contains all domain and range
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77 * axes of the given chart.
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78 *
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79 * @param cr The ElementCreator.
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80 * @param chart The chart that provides range information of its axes.
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81 *
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82 * @return an element with axes information.
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83 */
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84 protected Element createAxesElements(
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85 ElementCreator cr,
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86 JFreeChart chart)
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87 {
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88 logger.debug("InfoGeneratorHelper.createRangeElements");
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89
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90 Element axes = cr.create("axes");
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91
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92 XYPlot plot = (XYPlot) chart.getPlot();
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93
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94 int dAxisCount = plot.getDomainAxisCount();
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95 for (int i = 0; i < dAxisCount; i++) {
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96 ValueAxis axis = plot.getDomainAxis(i);
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97 XYDataset data = plot.getDataset(i);
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98
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99 if (axis != null) {
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100 Element e = createAxisElement(cr, axis, data, "domain", i);
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101 axes.appendChild(e);
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102 }
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103 }
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104
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105 int rAxisCount = plot.getRangeAxisCount();
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106 for (int i = 0; i < rAxisCount; i++) {
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107 ValueAxis axis = plot.getRangeAxis(i);
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108 XYDataset data = plot.getDataset(i);
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109
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110 if (axis == null || data == null) {
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111 logger.warn("Axis or dataset is empty at pos: " + i);
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112 continue;
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113 }
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114
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115 Element e = createAxisElement(cr, axis, data, "range", i);
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116 axes.appendChild(e);
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117 }
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118
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119 return axes;
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120 }
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121
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122
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123 /**
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124 * This method create a axis element for a given <i>axis</i> and
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125 * <i>type</i>. Type can be one of 'domain' or 'range'.
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126 *
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127 * @param cr The ElementCreator
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128 * @param axis The axis that provides range information.
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129 * @param dataset The dataset for min/max determination.
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130 * @param type The axis type ('domain' or 'range').
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131 * @param pos The position in the chart.
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132 *
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133 * @return An element that contains range information of a given axis.
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134 */
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135 protected Element createAxisElement(
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136 ElementCreator cr,
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137 ValueAxis axis,
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138 XYDataset dataset,
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139 String type,
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140 int pos)
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141 {
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142 logger.debug("createAxisElement " + pos);
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143 Range range = axis.getRange();
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144
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145 Element e = cr.create(type);
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146 cr.addAttr(e, "pos", String.valueOf(pos), true);
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147 cr.addAttr(e, "from", String.valueOf(range.getLowerBound()), true);
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148 cr.addAttr(e, "to", String.valueOf(range.getUpperBound()), true);
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149
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150 //Range[] rs = generator.getRangesForDataset(dataset);
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151 Range[] rs = generator.getRangesForAxis(pos);
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152 Range r = null;
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153
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154 if (type.equals("range")) {
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155 r = rs[1];
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156 }
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157 else {
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158 r = rs[0];
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159 }
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160
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161 cr.addAttr(e, "min", String.valueOf(r.getLowerBound()), true);
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162 cr.addAttr(e, "max", String.valueOf(r.getUpperBound()), true);
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163
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164 return e;
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165 }
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166
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167
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168 /**
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169 * This method appends the values of a transformation matrix to transform
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170 * image pixel coordinates into chart coordinates.
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171 *
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172 * @param cr The ElementCreator.
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173 * @param chart The chart object.
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174 * @param info The ChartRenderingInfo that is filled while chart creation.
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175 *
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176 * @return an element that contains one or more transformation matrix.
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177 */
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178 protected Element createTransformationElements(
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179 ElementCreator cr,
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180 JFreeChart chart,
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181 ChartRenderingInfo info)
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182 {
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183 logger.debug("InfoGeneratorHelper.createTransformationElements");
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184
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185 Element tf = cr.create("transformation-matrix");
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186
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187 Rectangle2D dataArea = info.getPlotInfo().getDataArea();
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188
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189 XYPlot plot = (XYPlot) chart.getPlot();
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190 ValueAxis xAxis = plot.getDomainAxis();
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191
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192 if (xAxis == null) {
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193 logger.error("There is no x axis in the chart!");
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194 return null;
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195 }
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196
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197 for (int i = 0, num = plot.getRangeAxisCount(); i < num; i++) {
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198 ValueAxis yAxis = plot.getRangeAxis(i);
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199
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200 if (yAxis == null) {
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201 logger.warn("No y axis at pos " + i + " existing.");
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202 continue;
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203 }
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204
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205 Element matrix = createTransformationElement(
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206 cr, xAxis, yAxis, dataArea, i);
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207
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208 tf.appendChild(matrix);
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209 }
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210
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211 return tf;
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212 }
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213
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214
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215 /**
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216 * Creates an element that contains values used to transform coordinates
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217 * of a coordinate system A into a coordinate system B.
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218 *
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219 * @param cr The ElementCreator.
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220 * @param xAxis The x axis of the target coordinate system.
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221 * @param yAxis The y axis of the target coordinate system.
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222 * @param dataArea The pixel coordinates of the chart image.
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223 * @param pos The dataset position.
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224 *
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225 * @return an element that contains transformation matrix values.
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226 */
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227 protected Element createTransformationElement(
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228 ElementCreator cr,
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229 ValueAxis xAxis,
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230 ValueAxis yAxis,
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231 Rectangle2D dataArea,
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232 int pos)
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233 {
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234 double[] tm = createTransformationMatrix(dataArea, xAxis, yAxis);
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235
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236 Element matrix = cr.create("matrix");
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237
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238 cr.addAttr(matrix, "pos", String.valueOf(pos), true);
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239 cr.addAttr(matrix, "sx", String.valueOf(tm[0]), true);
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240 cr.addAttr(matrix, "sy", String.valueOf(tm[1]), true);
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241 cr.addAttr(matrix, "tx", String.valueOf(tm[2]), true);
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242 cr.addAttr(matrix, "ty", String.valueOf(tm[3]), true);
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243
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244 return matrix;
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245 }
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246
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247
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248 /**
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249 * This method determines a transformation matrix to transform pixel
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250 * coordinates of the chart image into chart coordinates.
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251 *
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252 * @param dataArea The rectangle that contains the data points of the chart.
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253 * @param xRange The x axis range.
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254 * @param yRange The y axis range.
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255 *
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256 * @return a double array as follows: [sx, sy, tx, ty].
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257 */
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258 protected static double[] createTransformationMatrix(
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259 Rectangle2D dataArea,
648
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260 ValueAxis xAxis,
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261 ValueAxis yAxis)
647
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262 {
648
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263 logger.debug("InfoGeneratorHelper.createTransformationMatrix");
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264
647
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265 double offsetX = dataArea.getX();
657
ac1399d325e9 Removed asymmetrical "- 1" from width calculation.
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266 double width = dataArea.getWidth();
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267 double offsetY = dataArea.getY();
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268 double height = dataArea.getHeight();
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269
648
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270 Range xRange = xAxis.getRange();
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271 Range yRange = yAxis.getRange();
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272
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273 double lowerX = xRange.getLowerBound();
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274 double upperX = xRange.getUpperBound();
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275 double lowerY = yRange.getLowerBound();
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276 double upperY = yRange.getUpperBound();
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277
648
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278 if (xAxis.isInverted()) {
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279 logger.info("X-Axis is inverted!");
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280
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281 double tmp = upperX;
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282 upperX = lowerX;
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283 lowerX = tmp;
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284 }
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285
647
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286 double dMoveX = upperX - lowerX;
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287 double fMoveX = width * lowerX;
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288 double dMoveY = lowerY - upperY;
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289 double fMoveY = height * upperY;
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290
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291 AffineTransform t1 = AffineTransform.getTranslateInstance(
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292 offsetX - ( fMoveX / dMoveX ),
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293 offsetY - ( fMoveY / dMoveY ) );
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294
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295 AffineTransform t2 = AffineTransform.getScaleInstance(
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296 width / (upperX - lowerX),
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297 height / (lowerY - upperY));
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298
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299 t1.concatenate(t2);
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300
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301 try {
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302 t1.invert();
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303
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304 double[] c = new double[6];
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305 t1.getMatrix(c);
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306
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307 return new double[] { c[0], c[3], c[4], c[5] };
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308 }
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309 catch (NoninvertibleTransformException e) {
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310 // do nothing
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311 logger.warn("Matrix is not invertible.");
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312 }
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313
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314 return new double[] { 1d, 1d, 0d, 0d };
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315 }
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316 }
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317 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org