svn-gvsig-desktop / tags / v1_0_2_Build_907 / extensions / extGeoProcessing / src / com / iver / cit / gvsig / geoprocess / core / util / UnitUtils.java @ 11015
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1 | 6108 | azabala | /*
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2 | * Created on 29-jun-2006
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3 | *
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4 | * gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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5 | *
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6 | * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
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7 | *
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8 | * This program is free software; you can redistribute it and/or
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9 | * modify it under the terms of the GNU General Public License
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10 | * as published by the Free Software Foundation; either version 2
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11 | * of the License, or (at your option) any later version.
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12 | *
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13 | * This program is distributed in the hope that it will be useful,
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 | * GNU General Public License for more details.
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17 | *
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18 | * You should have received a copy of the GNU General Public License
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19 | * along with this program; if not, write to the Free Software
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20 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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21 | *
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22 | * For more information, contact:
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23 | *
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24 | * Generalitat Valenciana
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25 | * Conselleria d'Infraestructures i Transport
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26 | * Av. Blasco Ib??ez, 50
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27 | * 46010 VALENCIA
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28 | * SPAIN
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29 | *
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30 | * +34 963862235
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31 | * gvsig@gva.es
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32 | * www.gvsig.gva.es
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33 | *
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34 | * or
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35 | *
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36 | * IVER T.I. S.A
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37 | * Salamanca 50
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38 | * 46005 Valencia
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39 | * Spain
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40 | *
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41 | * +34 963163400
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42 | * dac@iver.es
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43 | */
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44 | /* CVS MESSAGES:
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45 | *
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46 | * $Id$
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47 | * $Log$
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48 | 10552 | azabala | * Revision 1.3.2.5 2007-02-28 12:26:01 azabala
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49 | * solved bug when view has a geodetic projection
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50 | *
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51 | * Revision 1.3.2.4 2007/01/12 13:25:53 caballero
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52 | 9711 | caballero | * unidades de mapa y medida
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53 | *
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54 | * Revision 1.3.2.3 2006/12/22 10:15:07 caballero
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55 | 9450 | caballero | * unidades de mapa y de medida
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56 | *
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57 | * Revision 1.3.2.2 2006/12/21 18:21:52 azabala
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58 | 9425 | azabala | * Bug fixed: change getMapUnits for getDistanceUnits
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59 | *
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60 | * Revision 1.3.2.1 2006/11/15 00:08:17 jjdelcerro
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61 | 8765 | jjdelcerro | * *** empty log message ***
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62 | *
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63 | * Revision 1.4 2006/09/15 10:42:54 caballero
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64 | * extensibilidad de documentos
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65 | *
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66 | * Revision 1.3 2006/08/29 07:56:30 cesar
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67 | 6880 | cesar | * Rename the *View* family of classes to *Window* (ie: SingletonView to SingletonWindow, ViewInfo to WindowInfo, etc)
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68 | *
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69 | * Revision 1.2 2006/08/29 07:21:09 cesar
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70 | 6878 | cesar | * Rename com.iver.cit.gvsig.fmap.Fmap class to com.iver.cit.gvsig.fmap.MapContext
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71 | *
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72 | * Revision 1.1 2006/06/29 17:30:36 azabala
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73 | 6108 | azabala | * first version in cvs
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74 | *
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75 | *
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76 | */
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77 | package com.iver.cit.gvsig.geoprocess.core.util; |
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78 | |||
79 | import org.cresques.cts.IProjection; |
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80 | import org.cresques.cts.gt2.CSUTM; |
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81 | |||
82 | import com.iver.andami.PluginServices; |
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83 | 6878 | cesar | import com.iver.cit.gvsig.fmap.MapContext; |
84 | 8765 | jjdelcerro | import com.iver.cit.gvsig.project.documents.view.gui.View; |
85 | 6108 | azabala | |
86 | /**
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87 | * Utility methods to manage distances
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88 | * (conversion from user entries to internal units,
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89 | 9450 | caballero | * verifying if projection is planar or we are
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90 | 6108 | azabala | * working with geographic coordinates, etc.)
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91 | * @author azabala
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92 | *
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93 | */
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94 | public class UnitUtils { |
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95 | 9450 | caballero | |
96 | 6108 | azabala | public static final double EARTH_RADIUS = 6378137d; |
97 | |||
98 | /**
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99 | * For computing with geodetic coordinates:
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100 | * returns the angular measure (in radians)
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101 | 9450 | caballero | * for a distance over the earth along a
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102 | 6108 | azabala | * meridiam.
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103 | * Because this consideration is an approximation,
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104 | * we consideer the eart like an sphere (not an
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105 | * ellipsoid)
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106 | * @param dist distance in meters
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107 | * @return arc of meridian whose length is the specified
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108 | * distance
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109 | */
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110 | public static double toSexaAngularMeasure(double dist){ |
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111 | /*
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112 | * dist = 6378km(terrestrial radius) -> 2PI
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113 | * passed distance -> incognite
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114 | */
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115 | return Math.toDegrees((2 * Math.PI * dist)/EARTH_RADIUS); |
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116 | } |
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117 | 9450 | caballero | |
118 | |||
119 | 6108 | azabala | |
120 | 9425 | azabala | /**
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121 | * Converts a distance entered by user in the GUI in the same distance
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122 | * in internal units (measure units)
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123 | *
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124 | * */
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125 | 6108 | azabala | public static double getInInternalUnits(double userEntryDistance){ |
126 | 10552 | azabala | // VCN he modificado esto a como creo que deber?a de estar,
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127 | //as? tiene en cuenta para calcular la distancia tanto las unidades
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128 | //en las que se encuentra la cartograf?a como las unidades de medida
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129 | //seleccionadas por el usuario.
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130 | IProjection proj = ((View)PluginServices.
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131 | getMDIManager(). |
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132 | getActiveWindow()). |
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133 | getMapControl(). |
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134 | getViewPort(). |
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135 | getProjection(); |
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136 | |||
137 | 9450 | caballero | int distanceUnits = ((View)PluginServices. |
138 | getMDIManager(). |
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139 | getActiveWindow()).getMapControl().getViewPort().getDistanceUnits(); |
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140 | 10552 | azabala | |
141 | boolean isProjected = proj.isProjected();
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142 | int mapUnits = -1; |
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143 | if(isProjected){
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144 | mapUnits = ((View)PluginServices.
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145 | 6108 | azabala | getMDIManager(). |
146 | 9450 | caballero | getActiveWindow()).getMapControl().getViewPort().getMapUnits(); |
147 | 10552 | azabala | }else{
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148 | mapUnits = 1;
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149 | } |
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150 | |||
151 | double distInInternalUnits = (userEntryDistance/MapContext.CHANGEM[mapUnits]) *
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152 | MapContext.CHANGEM[distanceUnits]; |
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153 | |||
154 | 6108 | azabala | /*
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155 | * if layer's projections is in geographics
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156 | coords, pass distance to a angular measure
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157 | */
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158 | 10552 | azabala | |
159 | if( (proj != null) && !(isProjected)){ |
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160 | 6108 | azabala | distInInternalUnits = |
161 | 9450 | caballero | UnitUtils.toSexaAngularMeasure(distInInternalUnits); |
162 | 6108 | azabala | } |
163 | return distInInternalUnits;
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164 | } |
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165 | 9450 | caballero | |
166 | |||
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168 | |||
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171 | 6108 | azabala | } |