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annotate flys-artifacts/src/main/java/de/intevation/flys/jfree/JFreeUtil.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 fb07f936b5ad
children 5642a83420f2
rev   line source
3018
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1 package de.intevation.flys.jfree;
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2
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3 import java.awt.Shape;
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4 import java.awt.geom.Rectangle2D;
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5
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6 import java.util.Iterator;
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7
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8 import org.jfree.chart.entity.ChartEntity;
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9 import org.jfree.chart.entity.EntityCollection;
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10
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11 public class JFreeUtil {
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12
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13 /** Do not instantiate. */
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14 private JFreeUtil() {
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15 }
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16
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17
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18 /**
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19 * True if \param hotspot collides with a Entity in \param entities.
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20 * @param hotspot Shape to compare against other shapes (bounds only).
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21 * @param entities entities against which to compare shape.
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22 * @param exclusiveEntityClass If not null, consider only entities of
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23 * given class.
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24 * @return true if a collision (non-zero intersection) exists between
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25 * shapes.
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26 */
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27 public static boolean collides(Shape hotspot, EntityCollection entities,
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28 Class exclusiveEntityClass) {
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29 if (entities == null) return false;
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30
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31 Rectangle2D hotspotBox = hotspot.getBounds2D();
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32
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33 for (Iterator i = entities.iterator(); i.hasNext(); ) {
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34 Object next = i.next();
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35 ChartEntity entity = (ChartEntity) next;
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36 if (exclusiveEntityClass == null
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37 || exclusiveEntityClass.isInstance(entity))
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38 {
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39 if (entity.getArea().intersects(hotspotBox)) {
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40 // Found collision, early stop.
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41 return true;
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42 }
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43 }
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44 }
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45
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46 return false;
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47 }
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48 }
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