svn-gvsig-desktop / trunk / extensions / extSymbology / src / org / gvsig / symbology / fmap / labeling / placements / LinePlacementInTheMiddle.java @ 19091
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1 | 18763 | jdominguez | /* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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2 | *
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3 | * Copyright (C) 2005 IVER T.I. and Generalitat Valenciana.
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4 | *
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5 | * This program is free software; you can redistribute it and/or
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6 | * modify it under the terms of the GNU General Public License
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7 | * as published by the Free Software Foundation; either version 2
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8 | * of the License, or (at your option) any later version.
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9 | *
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10 | * This program is distributed in the hope that it will be useful,
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 | * GNU General Public License for more details.
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14 | *
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15 | * You should have received a copy of the GNU General Public License
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16 | * along with this program; if not, write to the Free Software
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17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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18 | *
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19 | * For more information, contact:
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20 | *
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21 | * Generalitat Valenciana
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22 | * Conselleria d'Infraestructures i Transport
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23 | * Av. Blasco Ib??ez, 50
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24 | * 46010 VALENCIA
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25 | * SPAIN
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26 | *
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27 | * +34 963862235
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28 | * gvsig@gva.es
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29 | * www.gvsig.gva.es
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30 | *
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31 | * or
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32 | *
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33 | * IVER T.I. S.A
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34 | * Salamanca 50
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35 | * 46005 Valencia
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36 | * Spain
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37 | *
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38 | * +34 963163400
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39 | * dac@iver.es
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40 | */
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41 | package org.gvsig.symbology.fmap.labeling.placements; |
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42 | |||
43 | import java.awt.geom.Point2D; |
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44 | |||
45 | import org.apache.batik.ext.awt.geom.PathLength; |
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46 | |||
47 | import com.iver.cit.gvsig.fmap.core.FShape; |
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48 | import com.iver.cit.gvsig.fmap.rendering.styling.labeling.IPlacementConstraints; |
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49 | import com.iver.cit.gvsig.fmap.rendering.styling.labeling.LabelClass; |
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50 | import com.iver.cit.gvsig.fmap.rendering.styling.labeling.LabelLocationMetrics; |
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51 | import com.iver.utiles.swing.threads.Cancellable; |
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52 | |||
53 | /**
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54 | *
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55 | * LinePlacementInTheMiddle.java
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56 | *
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57 | *
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58 | * @author jaume dominguez faus - jaume.dominguez@iver.es Dec 17, 2007
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59 | *
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60 | */
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61 | public class LinePlacementInTheMiddle extends AbstractLinePlacement { |
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62 | |||
63 | public boolean isSuitableFor(IPlacementConstraints placementConstraints, |
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64 | int shapeType) {
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65 | if (shapeType == FShape.LINE) {
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66 | 19011 | jdominguez | return placementConstraints != null && |
67 | placementConstraints.isInTheMiddleOfLine() |
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68 | && !placementConstraints.isFollowingLine(); |
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69 | 18763 | jdominguez | } |
70 | return false; |
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71 | } |
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72 | |||
73 | @Override
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74 | LabelLocationMetrics initialLocation(LabelClass lc, |
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75 | IPlacementConstraints pc, PathLength pathLen, Cancellable cancel) { |
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76 | if (cancel.isCanceled()) return null; |
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77 | |||
78 | float length = pathLen.lengthOfPath();
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79 | float distance = (float) (length * 0.5); |
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80 | |||
81 | |||
82 | double theta = 0; |
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83 | if (pc.isParallel()) {
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84 | // get the line theta and apply it
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85 | theta = pathLen.angleAtLength(distance); |
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86 | |||
87 | } else if (pc.isPerpendicular()) { |
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88 | // get the line theta with 90 degrees
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89 | theta = pathLen.angleAtLength(distance) + AbstractLinePlacement.HALF_PI; |
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90 | } |
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91 | |||
92 | Point2D p = pathLen.pointAtLength(distance);
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93 | |||
94 | /*
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95 | * Offset the point to a distance of the height of the
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96 | * label class's height to make the label appear to
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97 | * be on the line.
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98 | *
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99 | */
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100 | double x = p.getX();
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101 | double y = p.getY();
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102 | double halfHeight = lc.getBounds().getHeight()*.5; |
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103 | double halfWidth = lc.getBounds().getWidth()*.5; |
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104 | |||
105 | double sinTheta = Math.sin(theta); |
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106 | double cosTheta = Math.cos(theta); |
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107 | |||
108 | double xOffset = halfHeight * sinTheta;
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109 | double yOffset = halfHeight * cosTheta;
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110 | |||
111 | /*
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112 | * now, offset the anchor point as much as need to
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113 | * make the center of the label be the middle of the
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114 | * line
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115 | */
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116 | xOffset -= halfWidth * cosTheta; |
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117 | yOffset += halfWidth * sinTheta; |
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118 | |||
119 | p.setLocation(x + xOffset, y - yOffset); |
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120 | |||
121 | return new LabelLocationMetrics( |
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122 | p, |
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123 | theta, |
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124 | true);
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125 | } |
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126 | |||
127 | } |