Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/jfree/CollisionFreeXYTextAnnotation.java @ 3023:e19ff9086035

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Avoid collisions between line labels. flys-artifacts/trunk@4590 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Tue, 05 Jun 2012 15:03:11 +0000
parents 0b8c04c7f762
children 65b6e27c6f25
rev   line source
2157
c4ceade9d50e Added new Annotation class that prevents collisions (to replace StickyAxisAnnotation).
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1 package de.intevation.flys.jfree;
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2
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3 import org.apache.log4j.Logger;
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4
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5 import java.util.Iterator;
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6
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7 import java.awt.Shape;
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8 import java.awt.geom.Rectangle2D;
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9
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10 import org.jfree.chart.entity.EntityCollection;
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11 import org.jfree.chart.annotations.XYTextAnnotation;
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12 import org.jfree.chart.axis.ValueAxis;
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13 import org.jfree.chart.plot.PlotOrientation;
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14 import org.jfree.chart.plot.XYPlot;
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15 import org.jfree.chart.entity.XYAnnotationEntity;
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16 import org.jfree.chart.plot.PlotRenderingInfo;
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17 import org.jfree.chart.plot.Plot;
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18
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19 import org.jfree.text.TextUtilities;
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20
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21 import org.jfree.ui.RectangleEdge;
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22
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23 import de.intevation.flys.jfree.JFreeUtil;
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24
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25
c4ceade9d50e Added new Annotation class that prevents collisions (to replace StickyAxisAnnotation).
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26 /**
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27 * Custom Annotations class that is drawn only if no collisions with other
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28 * already drawn CustomAnnotations in current plot are found.
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29 */
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30 public class CollisionFreeXYTextAnnotation extends XYTextAnnotation {
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31
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32 /** Logger for this class. */
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33 private static Logger logger =
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34 Logger.getLogger(CollisionFreeXYTextAnnotation.class);
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35
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36
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37 public CollisionFreeXYTextAnnotation(String text, double x, double y) {
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38 super(text, x, y);
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39 }
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40
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41
c4ceade9d50e Added new Annotation class that prevents collisions (to replace StickyAxisAnnotation).
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42 /**
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43 * Draw the Annotation only if it does not collide with other
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44 * already drawn Annotations- texts.
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45 *
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46 * @param g2 the graphics device.
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47 * @param plot the plot.
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48 * @param dataArea the data area.
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49 * @param domainAxis the domain axis.
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50 * @param rangeAxis the range axis.
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51 * @param rendererIndex the render index.
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52 * @param info state information, escpecially collects info about
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53 * already drawn shapes (and thus annotations), used
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54 * for collision detection.
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55 */
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56 @Override
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57 public void draw(
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58 java.awt.Graphics2D g2,
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59 XYPlot plot,
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60 java.awt.geom.Rectangle2D dataArea,
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61 ValueAxis domainAxis,
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62 ValueAxis rangeAxis,
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63 int rendererIndex,
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64 PlotRenderingInfo info
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65 ) {
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66 // From superclass, adjusted access only.
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67 PlotOrientation orientation = plot.getOrientation();
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68 RectangleEdge domainEdge = Plot.resolveDomainAxisLocation(
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69 plot.getDomainAxisLocation(), orientation);
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70 RectangleEdge rangeEdge = Plot.resolveRangeAxisLocation(
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71 plot.getRangeAxisLocation(), orientation);
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72
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73 float anchorX = (float) domainAxis.valueToJava2D(
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74 this.getX(), dataArea, domainEdge);
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75 float anchorY = (float) rangeAxis.valueToJava2D(
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76 this.getY(), dataArea, rangeEdge);
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77
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78 if (orientation == PlotOrientation.HORIZONTAL) {
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79 float tempAnchor = anchorX;
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80 anchorX = anchorY;
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81 anchorY = tempAnchor;
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82 }
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83
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84 g2.setFont(getFont());
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85 Shape hotspot = TextUtilities.calculateRotatedStringBounds(
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86 getText(), g2, anchorX, anchorY, getTextAnchor(),
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87 getRotationAngle(), getRotationAnchor());
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88
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89 // Deviation from superclass: prevent collision.
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90 Rectangle2D hotspotBox = hotspot.getBounds2D();
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91
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92 if (JFreeUtil.collides(hotspot, info.getOwner().getEntityCollection(),
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93 XYAnnotationEntity.class)) {
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94 return;
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95 }
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96
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97 if (this.getBackgroundPaint() != null) {
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98 g2.setPaint(this.getBackgroundPaint());
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99 g2.fill(hotspot);
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100 }
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101 g2.setPaint(getPaint());
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102 TextUtilities.drawRotatedString(getText(), g2, anchorX, anchorY,
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103 getTextAnchor(), getRotationAngle(), getRotationAnchor());
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104 if (this.isOutlineVisible()) {
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105 g2.setStroke(this.getOutlineStroke());
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106 g2.setPaint(this.getOutlinePaint());
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107 g2.draw(hotspot);
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108 }
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109
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110 //String toolTip = getToolTipText();
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111 //String url = getURL();
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112 String toolTip = "CollisionFreeXYTextAnnotation";
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113 String url = toolTip;
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114
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115 if (toolTip != null || url != null) {
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116 addEntity(info, hotspot, rendererIndex, toolTip, url);
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117 }
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118 else {
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119 addEntity(info, hotspot, rendererIndex,
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120 "CollisionFreeXYTextAnnotation",
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121 "CollisionFreeXYTextAnnotation");
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122 }
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123 }
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124
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125 /**
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126 * A utility method for adding an {@link CollisionFreeXYAnnotationEntity} to
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127 * a {@link PlotRenderingInfo} instance.
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128 *
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129 * @param info the plot rendering info (<code>null</code> permitted).
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130 * @param hotspot the hotspot area.
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131 * @param rendererIndex the renderer index.
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132 * @param toolTipText the tool tip text.
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133 * @param urlText the URL text.
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134 */
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135 protected void addEntity(PlotRenderingInfo info,
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136 Shape hotspot, int rendererIndex,
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137 String toolTipText, String urlText) {
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138 if (info == null) {
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139 return;
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140 }
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141 EntityCollection entities = info.getOwner().getEntityCollection();
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142 if (entities == null) {
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143 return;
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144 }
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145 CollisionFreeXYTextAnnotationEntity entity =
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146 new CollisionFreeXYTextAnnotationEntity(hotspot,
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147 rendererIndex, toolTipText, urlText);
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148 entities.add(entity);
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149 }
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150 }
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151 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org