root / tags / v2_0_0_Build_2049 / applications / appgvSIG / src / org / gvsig / app / project / documents / view / toolListeners / snapping / snappers / TangentPointSnapper.java @ 38460
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1 | 29598 | jpiera | package org.gvsig.app.project.documents.view.toolListeners.snapping.snappers; |
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2 | 23642 | vcaballero | |
3 | import java.awt.geom.PathIterator; |
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4 | import java.awt.geom.Point2D; |
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5 | |||
6 | import org.gvsig.fmap.geom.Geometry; |
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7 | 27035 | jpiera | import org.gvsig.fmap.geom.primitive.Arc; |
8 | import org.gvsig.fmap.geom.primitive.Circle; |
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9 | import org.gvsig.fmap.geom.primitive.Ellipse; |
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10 | import org.gvsig.fmap.geom.primitive.Spline; |
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11 | 30349 | jpiera | import org.gvsig.fmap.mapcontrol.PrimitivesDrawer; |
12 | 23642 | vcaballero | import org.gvsig.fmap.mapcontrol.tools.snapping.snappers.ISnapperVectorial; |
13 | 30349 | jpiera | import org.gvsig.fmap.mapcontrol.tools.snapping.snappers.impl.AbstractSnapper; |
14 | 38226 | jldominguez | import org.gvsig.i18n.Messages; |
15 | 23642 | vcaballero | |
16 | import com.vividsolutions.jts.geom.Coordinate; |
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17 | import com.vividsolutions.jts.geom.LineSegment; |
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18 | |||
19 | |||
20 | /**
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21 | * Tangent point snapper.
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22 | *
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23 | * @author Vicente Caballero Navarro
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24 | */
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25 | public class TangentPointSnapper extends AbstractSnapper |
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26 | implements ISnapperVectorial {
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27 | /* (non-Javadoc)
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28 | * @see com.iver.cit.gvsig.gui.cad.snapping.ISnapper#getSnapPoint(Point2D point,
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29 | * IGeometry geom,double tolerance, Point2D lastPointEntered)
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30 | */
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31 | public Point2D getSnapPoint(Point2D point, Geometry geom, |
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32 | double tolerance, Point2D lastPointEntered) { |
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33 | 27035 | jpiera | if (!(geom instanceof Circle || |
34 | geom instanceof Arc ||
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35 | geom instanceof Ellipse ||
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36 | geom instanceof Spline)) {
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37 | 23642 | vcaballero | return null; |
38 | } |
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39 | |||
40 | Point2D resul = null; |
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41 | Coordinate c = new Coordinate(point.getX(), point.getY());
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42 | |||
43 | PathIterator theIterator = geom.getPathIterator(null, |
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44 | 30337 | jpiera | geomManager.getFlatness()); |
45 | 23642 | vcaballero | double[] theData = new double[6]; |
46 | double minDist = tolerance;
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47 | Coordinate from = null;
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48 | Coordinate first = null;
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49 | |||
50 | while (!theIterator.isDone()) {
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51 | //while not done
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52 | int theType = theIterator.currentSegment(theData);
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53 | |||
54 | switch (theType) {
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55 | case PathIterator.SEG_MOVETO: |
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56 | from = new Coordinate(theData[0], theData[1]); |
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57 | first = from; |
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58 | |||
59 | break;
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60 | |||
61 | case PathIterator.SEG_LINETO: |
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62 | |||
63 | // System.out.println("SEG_LINETO");
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64 | Coordinate to = new Coordinate(theData[0], theData[1]); |
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65 | LineSegment line = new LineSegment(from, to);
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66 | Coordinate closestPoint = line.closestPoint(c); |
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67 | double dist = c.distance(closestPoint);
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68 | |||
69 | if ((dist < minDist)) {
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70 | resul = new Point2D.Double(closestPoint.x, closestPoint.y); |
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71 | minDist = dist; |
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72 | } |
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73 | |||
74 | from = to; |
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75 | |||
76 | break;
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77 | |||
78 | case PathIterator.SEG_CLOSE: |
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79 | line = new LineSegment(from, first);
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80 | closestPoint = line.closestPoint(c); |
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81 | dist = c.distance(closestPoint); |
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82 | |||
83 | if ((dist < minDist)) {
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84 | resul = new Point2D.Double(closestPoint.x, closestPoint.y); |
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85 | minDist = dist; |
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86 | } |
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87 | |||
88 | from = first; |
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89 | |||
90 | break;
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91 | } //end switch
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92 | |||
93 | theIterator.next(); |
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94 | } |
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95 | |||
96 | return resul;
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97 | } |
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98 | |||
99 | /* (non-Javadoc)
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100 | * @see com.iver.cit.gvsig.gui.cad.snapping.ISnapper#getToolTipText()
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101 | */
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102 | public String getToolTipText() { |
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103 | 38226 | jldominguez | return Messages.getText("Tangent_point"); |
104 | 23642 | vcaballero | } |
105 | |||
106 | 30349 | jpiera | /*
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107 | * (non-Javadoc)
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108 | * @see org.gvsig.fmap.mapcontrol.tools.snapping.snappers.ISnapper#draw(org.gvsig.fmap.mapcontrol.PrimitivesDrawer, java.awt.geom.Point2D)
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109 | 23642 | vcaballero | */
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110 | 30349 | jpiera | public void draw(PrimitivesDrawer primitivesDrawer, Point2D pPixels) { |
111 | primitivesDrawer.setColor(getColor()); |
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112 | 23642 | vcaballero | |
113 | int half = getSizePixels() / 2; |
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114 | 30349 | jpiera | primitivesDrawer.drawLine((int) (pPixels.getX() - half),
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115 | 23642 | vcaballero | (int) (pPixels.getY() - half), (int) (pPixels.getX() + half), |
116 | (int) (pPixels.getY() - half));
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117 | 30349 | jpiera | primitivesDrawer.drawOval((int) (pPixels.getX() - half),
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118 | 23642 | vcaballero | (int) (pPixels.getY() - half), getSizePixels(), getSizePixels());
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119 | } |
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120 | |||
121 | |||
122 | } |