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copyLayer.cpp

Shows how to duplicate a layer changing its projection.

    /************************************************************************************
    TerraLib - a library for developing GIS applications.
    Copyright © 2001-2004 INPE and Tecgraf/PUC-Rio.

    This code is part of the TerraLib library.
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    You should have received a copy of the GNU Lesser General Public
    License along with this library.

    The authors reassure the license terms regarding the warranties.
    They specifically disclaim any warranties, including, but not limited to,
    the implied warranties of merchantability and fitness for a particular purpose.
    The library provided hereunder is on an "as is" basis, and the authors have no
    obligation to provide maintenance, support, updates, enhancements, or modifications.
    In no event shall INPE and Tecgraf / PUC-Rio be held liable to any party for direct,
    indirect, special, incidental, or consequential damages arising out of the use
    of this library and its documentation.
    *************************************************************************************/
    /*
               This file shows an example of how to duplicate a layer changing its projection.

               Author: Lubia Vinhas
    */

    #include "../../src/terralib/drivers/MySQL/TeMySQL.h"
    #include "../../src/terralib/functions/TeLayerFunctions.h"

    int main()
    {
               // Datatabase server parameters
               string host = "localhost";
               string dbname = "DB320RC1";
               string user = "root";
               string password = "vinhas";

               // Open a connection to a MySQL database
               TeDatabase* db = new TeMySQL();
               if (!db->connect(host, user, password, dbname))
               {
                          cout << "Error: " << db->errorMessage() << endl << endl;
                          cout << "Press Enter\n";
                          getchar();
                          return 1;
               }

               cout << "Database \"" << dbname << "\" connected on MySQL \"localhost\" server!" << endl << endl;

               // Load the layer Distritos by its name
               TeLayer* layer1 = new TeLayer("Distritos");
               if (!db->loadLayer(layer1))
               {
                          cout << "The layer \"Distritos\" could not be loaded from the database!\n\n";
                          db->close();
                          cout << "Press Enter\n";
                          getchar();
                          return 1;
               }
               cout << "Layer \"" << layer1->name() << "\" retrieved!" << endl;

               // Show the layer projection
               TeProjection* proj1 = layer1->projection();
               cout << "Projection/Datum of the layer \"Distritos\": " << proj1->name();
               cout << "/" << proj1->datum().name() << endl <<endl;

               // Create a different projection
               TeDatum sad69 = TeDatumFactory::make("SAD69");
               TeProjection* proj2 = new TeLatLong(sad69);

               // Create a layer with a different projection
               TeLayer* layer2 = new TeLayer("Distritos_LL", db, proj2);

               // Copy the layer doing a remapping of its geometries
               bool res = TeCopyLayerToLayer(layer1, layer2);

               if (res)
                          cout << "Layer \"Distritos\" was successfully copied to layer \"Distritos_LL\"\n\n";
               else
                          cout << "Fail to remap layer!\n\n";

               db->close();
               cout << "Press Enter\n";
               getchar();
               return 0;
    }

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