root / trunk / extensions / extGeoProcessing / src / com / iver / cit / gvsig / geoprocess / core / util / UnitUtils.java @ 7304
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/*
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* Created on 29-jun-2006
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*
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* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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*
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* Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
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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 2
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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*
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* For more information, contact:
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*
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* Generalitat Valenciana
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* Conselleria d'Infraestructures i Transport
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* Av. Blasco Ib??ez, 50
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* 46010 VALENCIA
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* SPAIN
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*
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* +34 963862235
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* gvsig@gva.es
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* www.gvsig.gva.es
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*
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* or
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*
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* IVER T.I. S.A
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* Salamanca 50
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* 46005 Valencia
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* Spain
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*
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* +34 963163400
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* dac@iver.es
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*/
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/* CVS MESSAGES:
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*
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* $Id: UnitUtils.java 7304 2006-09-15 10:44:24Z caballero $
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* $Log$
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* Revision 1.4 2006-09-15 10:42:54 caballero
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* extensibilidad de documentos
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*
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* Revision 1.3 2006/08/29 07:56:30 cesar
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* Rename the *View* family of classes to *Window* (ie: SingletonView to SingletonWindow, ViewInfo to WindowInfo, etc)
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*
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* Revision 1.2 2006/08/29 07:21:09 cesar
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* Rename com.iver.cit.gvsig.fmap.Fmap class to com.iver.cit.gvsig.fmap.MapContext
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*
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* Revision 1.1 2006/06/29 17:30:36 azabala
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* first version in cvs
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*
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*
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*/
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package com.iver.cit.gvsig.geoprocess.core.util; |
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import org.cresques.cts.IProjection; |
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import org.cresques.cts.gt2.CSUTM; |
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import com.iver.andami.PluginServices; |
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import com.iver.cit.gvsig.fmap.MapContext; |
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import com.iver.cit.gvsig.project.documents.view.gui.View; |
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/**
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* Utility methods to manage distances
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* (conversion from user entries to internal units,
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* verifying if projection is planar or we are
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* working with geographic coordinates, etc.)
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* @author azabala
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*
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*/
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public class UnitUtils { |
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public static final double EARTH_RADIUS = 6378137d; |
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/**
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* For computing with geodetic coordinates:
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* returns the angular measure (in radians)
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* for a distance over the earth along a
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* meridiam.
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* Because this consideration is an approximation,
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* we consideer the eart like an sphere (not an
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* ellipsoid)
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* @param dist distance in meters
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* @return arc of meridian whose length is the specified
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* distance
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*/
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public static double toSexaAngularMeasure(double dist){ |
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/*
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* dist = 6378km(terrestrial radius) -> 2PI
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* passed distance -> incognite
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*/
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return Math.toDegrees((2 * Math.PI * dist)/EARTH_RADIUS); |
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} |
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public static double getInInternalUnits(double userEntryDistance){ |
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int mapUnits = ((View)PluginServices. |
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getMDIManager(). |
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getActiveWindow()).getMapControl().getViewPort().getMapUnits(); |
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double distInInternalUnits = userEntryDistance * MapContext.CHANGEM[mapUnits];
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/*
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* if layer's projections is in geographics
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coords, pass distance to a angular measure
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*/
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IProjection proj = ((View)PluginServices.
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getMDIManager(). |
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getActiveWindow()). |
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getMapControl(). |
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getViewPort(). |
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getProjection(); |
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if( (proj != null) && !(proj instanceof CSUTM)){ |
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distInInternalUnits = |
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UnitUtils.toSexaAngularMeasure(distInInternalUnits); |
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} |
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return distInInternalUnits;
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} |
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} |
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