tcViewportWidget.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 tcViewportWidget.cpp
  22  * @brief OpenGL viewport widget.
  23  */
  24
  25 #include "tcViewportWidget.h"
  26 #include <tcObserver.h>
  27 #include <tcGlobe.h>
  28
  29 #include <QMouseEvent>
  30
  31 #include <cmath>
  32
  33 /*
  34  * Constructors + destructor
  35  */
  36
  37 /// Primary constructor.
  38 tcViewportWidget::tcViewportWidget(QWidget* parent)
  39 : QGLWidget(parent)
  40 , m_observer(new tcObserver())
  41 , m_globe(0)
  42 , m_mouseInteracting(false)
  43 , m_mousePos()
  44 {
  45 }
  46
  47 /// Destructor.
  48 tcViewportWidget::~tcViewportWidget()
  49 {
  50   delete m_observer;
  51 }
  52
  53 /*
  54  * Modifiers
  55  */
  56
  57 /// Set the globe object.
  58 void tcViewportWidget::setGlobe(tcGlobe* globe)
  59 {
  60   m_globe = globe;
  61   m_observer->setFocus(tcGeo( 7.0 * M_PI/180, 46.0 * M_PI/180), globe->meanRadius());
  62 }
  63
  64 /*
  65  * Rendering
  66  */
  67
  68 void tcViewportWidget::initializeGL()
  69 {
  70   glClearColor(0.0, 0.0, 0.0, 0.0);
  71 }
  72
  73 void tcViewportWidget::resizeGL(int w, int h)
  74 {
  75   glViewport(0, 0, (GLint)w, (GLint)h);
  76
  77   double aspect = (double)w / h;
  78   m_observer->setupProjection(aspect);
  79 }
  80
  81 void tcViewportWidget::paintGL()
  82 {
  83   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  84   glEnable(GL_DEPTH_TEST);
  85   glEnable(GL_CULL_FACE);
  86
  87   glEnable(GL_BLEND);
  88   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  89
  90
  91   m_observer->setupModelView();
  92
  93   m_globe->render(m_observer);
  94 }
  95
  96 /*
  97  * Mouse events
  98  */
  99
 100 void tcViewportWidget::mouseMoveEvent(QMouseEvent* event)
 101 {
 102   if (m_mouseInteracting)
 103   {
 104     QPointF dpos = event->posF() - m_mousePos;
 105     m_mousePos = event->posF();
 106
 107     // Pan the scene, adjust the observer focus
 108     m_observer->moveFocusRelative(dpos.x() / height(), dpos.y() / width());
 109
 110     updateGL();
 111   }
 112 }
 113
 114 void tcViewportWidget::mousePressEvent(QMouseEvent* event)
 115 {
 116   m_mouseInteracting = true;
 117   m_mousePos = event->posF();
 118 }
 119
 120 void tcViewportWidget::mouseReleaseEvent(QMouseEvent* event)
 121 {
 122   m_mouseInteracting = false;
 123 }
 124
 125 void tcViewportWidget::wheelEvent(QWheelEvent* event)
 126 {
 127   float delta = M_PI/180.0 * event->delta()/8;
 128   delta *= 0.5f;
 129   if (event->orientation() == Qt::Vertical)
 130   {
 131     if (event->modifiers().testFlag(Qt::ControlModifier))
 132     {
 133       m_observer->adjustElevation(-delta);
 134     }
 135     else
 136     {
 137       m_observer->adjustRange(delta);
 138     }
 139   }
 140   else
 141   {
 142     m_observer->adjustAzimuth(delta);
 143   }
 144
 145   updateGL();
 146 }