geo/tcGlobe.cpp

   1 /***************************************************************************
   2  *   This file is part of Tecorrec.                                        *
   3  *   Copyright 2008 James Hogan <james@albanarts.com>                      *
   4  *                                                                         *
   5  *   Tecorrec is free software: you can redistribute it and/or modify      *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation, either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   Tecorrec is distributed in the hope that it will be useful,           *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with Tecorrec.  If not, write to the Free Software Foundation,  *
  17  *   Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.   *
  18  ***************************************************************************/
  19
  20 /**
  21  * @file tcGlobe.cpp
  22  * @brief Manages data for a globe.
  23  */
  24
  25 #include "tcGlobe.h"
  26 #include "tcSrtmCache.h"
  27 #include "tcElevationData.h"
  28
  29 #include <GL/gl.h>
  30
  31 #include <cmath>
  32
  33 /*
  34  * Constructors + destructor
  35  */
  36
  37 /// Primary constructor.
  38 tcGlobe::tcGlobe(double meanRadius)
  39 : m_meanRadius(meanRadius)
  40 , m_srtmCache(new tcSrtmCache())
  41 , m_data()
  42 {
  43   addDataSet(new tcElevationData(m_srtmCache->loadData(6, 45)));
  44   addDataSet(new tcElevationData(m_srtmCache->loadData(7, 45)));
  45   addDataSet(new tcElevationData(m_srtmCache->loadData(6, 46)));
  46   addDataSet(new tcElevationData(m_srtmCache->loadData(7, 46)));
  47 }
  48
  49 /// Destructor.
  50 tcGlobe::~tcGlobe()
  51 {
  52 }
  53
  54 /*
  55  * Data sets
  56  */
  57
  58 /// Add a dataset to the globe.
  59 void tcGlobe::addDataSet(tcGeoData* data)
  60 {
  61   m_data.push_back(data);
  62 }
  63
  64 /*
  65  * Rendering
  66  */
  67
  68 /// Render from the POV of an observer.
  69 void tcGlobe::render(tcObserver* observer)
  70 {
  71   glColor3f(0.0f, 1.0f, 0.0f);
  72
  73   // Lines of longitude
  74   for (int lat = 5; lat < 180; lat += 5)
  75   {
  76     double z  = cos(M_PI/180*lat) * m_meanRadius;
  77     double xy = sin(M_PI/180*lat) * m_meanRadius;
  78     glBegin(GL_LINE_LOOP);
  79     {
  80       for (int lon = 0; lon < 360; ++lon)
  81       {
  82         glVertex3d(xy*sin(M_PI/180*lon), xy*cos(M_PI/180*lon), z);
  83       }
  84     }
  85     glEnd();
  86   }
  87
  88   // Lines of latitude
  89   for (int lon = 0; lon < 360; lon += 5)
  90   {
  91     double x = sin(M_PI/180*lon) * m_meanRadius;
  92     double y = cos(M_PI/180*lon) * m_meanRadius;
  93     glBegin(GL_LINE_STRIP);
  94     {
  95       for (int lat = 10; lat <= 170; ++lat)
  96       {
  97         double z = cos(M_PI/180*lat) * m_meanRadius;
  98         double xy = sin(M_PI/180*lat);
  99         glVertex3d(xy*x, xy*y, z);
 100       }
 101     }
 102     glEnd();
 103   }
 104
 105   foreach(tcGeoData* data, m_data)
 106   {
 107     data->renderSchematic(m_meanRadius);
 108   }
 109 }