svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.compat.cdc / org.gvsig.fmap.geometry / org.gvsig.fmap.geometry.operation / src / main / java / org / gvsig / fmap / geom / operation / perpendicular / Perpendicular.java @ 40559
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1 | 40559 | jjdelcerro | /**
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2 | * gvSIG. Desktop Geographic Information System.
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3 | 40435 | jjdelcerro | *
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4 | 40559 | jjdelcerro | * Copyright (C) 2007-2013 gvSIG Association.
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5 | 40435 | jjdelcerro | *
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6 | * This program is free software; you can redistribute it and/or
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7 | * modify it under the terms of the GNU General Public License
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8 | 40559 | jjdelcerro | * as published by the Free Software Foundation; either version 3
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9 | 40435 | jjdelcerro | * of the License, or (at your option) any later version.
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10 | *
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11 | * This program is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | * GNU General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU General Public License
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17 | * along with this program; if not, write to the Free Software
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18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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19 | * MA 02110-1301, USA.
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20 | *
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21 | 40559 | jjdelcerro | * For any additional information, do not hesitate to contact us
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22 | * at info AT gvsig.com, or visit our website www.gvsig.com.
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23 | 40435 | jjdelcerro | */
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24 | package org.gvsig.fmap.geom.operation.perpendicular; |
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25 | |||
26 | import org.gvsig.fmap.geom.Geometry; |
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27 | import org.gvsig.fmap.geom.Geometry.SUBTYPES; |
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28 | import org.gvsig.fmap.geom.GeometryLocator; |
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29 | import org.gvsig.fmap.geom.GeometryManager; |
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30 | import org.gvsig.fmap.geom.exception.CreateGeometryException; |
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31 | import org.gvsig.fmap.geom.operation.GeometryOperation; |
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32 | import org.gvsig.fmap.geom.operation.GeometryOperationContext; |
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33 | import org.gvsig.fmap.geom.operation.GeometryOperationException; |
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34 | import org.gvsig.fmap.geom.primitive.Point; |
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35 | |||
36 | |||
37 | /**
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38 | * Gets a couple of points that defines a line that is perpendicular to other line
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39 | * and intersects with a point.
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40 | * @author gvSIG Team
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41 | * @version $Id$
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42 | *
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43 | */
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44 | public class Perpendicular extends GeometryOperation{ |
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45 | public static final String NAME = "perpendicular"; |
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46 | private static GeometryManager geomManager = GeometryLocator.getGeometryManager(); |
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47 | public static final int CODE = geomManager.getGeometryOperationCode(NAME); |
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48 | |||
49 | public Object invoke(Geometry geom, GeometryOperationContext ctx) |
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50 | throws GeometryOperationException {
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51 | Point point1 = (Point)geom; |
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52 | Point point2 = (Point)ctx.getAttribute(PerpendicularOperationContext.SECOND_POINT); |
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53 | Point perpendicularPoint = (Point)ctx.getAttribute(PerpendicularOperationContext.PERPENDICULAR_POINT); |
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54 | |||
55 | if ((point2.getY() - point1.getY()) == 0) { |
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56 | try {
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57 | return new Point[] { |
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58 | geomManager.createPoint(perpendicularPoint.getX(), 0, SUBTYPES.GEOM2D),
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59 | geomManager.createPoint(perpendicularPoint.getX(), 1, SUBTYPES.GEOM2D)
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60 | }; |
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61 | } catch (CreateGeometryException e) {
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62 | throw new GeometryOperationException(e); |
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63 | } |
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64 | } |
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65 | |||
66 | //Pendiente de la recta perpendicular
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67 | double m = (point1.getX() - point2.getX()) / (point2.getY() - point1.getY());
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68 | |||
69 | //b de la funcion de la recta perpendicular
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70 | double b = perpendicularPoint.getY() - (m * perpendicularPoint.getX());
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71 | |||
72 | //Obtenemos un par de puntos
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73 | try {
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74 | return new Point[] { |
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75 | geomManager.createPoint(0, (m * 0) + b, SUBTYPES.GEOM2D), |
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76 | geomManager.createPoint(1000, (m * 1000) + b, SUBTYPES.GEOM2D) |
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77 | }; |
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78 | } catch (CreateGeometryException e) {
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79 | throw new GeometryOperationException(e); |
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80 | } |
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81 | } |
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82 | |||
83 | public int getOperationIndex() { |
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84 | return CODE;
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85 | } |
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86 | } |