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 / UnitVector.java @ 40559
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/**
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* gvSIG. Desktop Geographic Information System.
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*
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* Copyright (C) 2007-2013 gvSIG Association.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 3
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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* For any additional information, do not hesitate to contact us
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* at info AT gvsig.com, or visit our website www.gvsig.com.
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*/
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package org.gvsig.fmap.geom.operation.perpendicular; |
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import java.awt.geom.Point2D; |
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import org.gvsig.fmap.geom.Geometry; |
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import org.gvsig.fmap.geom.Geometry.SUBTYPES; |
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import org.gvsig.fmap.geom.GeometryLocator; |
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import org.gvsig.fmap.geom.GeometryManager; |
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import org.gvsig.fmap.geom.exception.CreateGeometryException; |
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import org.gvsig.fmap.geom.operation.GeometryOperation; |
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import org.gvsig.fmap.geom.operation.GeometryOperationContext; |
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import org.gvsig.fmap.geom.operation.GeometryOperationException; |
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import org.gvsig.fmap.geom.primitive.Point; |
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/**
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* Returns an unit vector from two points.
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*
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* @author gvSIG Team
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* @version $Id$
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*
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*/
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public class UnitVector extends GeometryOperation{ |
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public static final String NAME = "unitvector"; |
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private static GeometryManager geomManager = GeometryLocator.getGeometryManager(); |
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public static final int CODE = geomManager.getGeometryOperationCode(NAME); |
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public Object invoke(Geometry geom, GeometryOperationContext ctx) |
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throws GeometryOperationException {
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Point point1 = (Point)geom; |
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Point point2 = (Point)ctx.getAttribute(PerpendicularOperationContext.SECOND_POINT); |
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Point2D paux = new Point2D.Double(point2.getX() - point1.getX(), |
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point2.getY() - point1.getY()); |
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double v = Math.sqrt(Math.pow(paux.getX(), 2d) + |
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Math.pow(paux.getY(), 2d)); |
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paux = new Point2D.Double(paux.getX() / v, paux.getY() / v); |
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try{
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return geomManager.createPoint(paux.getX() / v, paux.getY() / v, SUBTYPES.GEOM2D);
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} catch (CreateGeometryException e) {
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throw new GeometryOperationException(e); |
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} |
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} |
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public int getOperationIndex() { |
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return CODE;
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} |
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} |