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QtGLGraphicsScene.cc
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52 
53 //=============================================================================
54 //
55 // CLASS QtGLGraphicsScene - IMPLEMENTATION
56 //
57 //=============================================================================
58 
59 //== INCLUDES =================================================================
60 
61 #include <ACG/GL/acg_glew.hh>
63 #include "QtGLGraphicsScene.hh"
64 #include "QtMultiViewLayout.hh"
65 #include <QApplication>
66 #include <QPainter>
67 #include <QPaintEngine>
68 #include <QGraphicsSceneMouseEvent>
69 
70 //== NAMESPACES ===============================================================
71 
72 //== IMPLEMENTATION ===========================================================
73 
74 QtGLGraphicsScene::QtGLGraphicsScene(std::vector< glViewer *> *_views,
75  QtMultiViewLayout *_layout) :
76  QGraphicsScene (),
77  views_(_views),
78  layout_(_layout),
79  cursorPainter_(0)
80 {
81 }
82 
83 //-----------------------------------------------------------------------------
84 
85 void QtGLGraphicsScene::drawBackground(QPainter *_painter, const QRectF &_rect)
86 {
87  // Check for switch in qt4.6 to OpenGL2
88  #if QT_VERSION >= 0x040600
89  if (_painter->paintEngine()->type() != QPaintEngine::OpenGL && _painter->paintEngine()->type() != QPaintEngine::OpenGL2 ) {
90  std::cerr << "QtGLGraphicsScene: drawBackground needs a QGLWidget to be set as viewport on the graphics view\n";
91  return;
92  }
93  #else
94  if (_painter->paintEngine()->type() != QPaintEngine::OpenGL ) {
95  std::cerr << "QtGLGraphicsScene: drawBackground needs a QGLWidget to be set as viewport on the graphics view\n";
96  return;
97  }
98  #endif
99 
100  // Initialize background first
101  _painter->setBackground(QApplication::palette().window());
102  _painter->eraseRect(_rect);
103 
104  // From now on we do OpenGL direct painting on the scene
105  #if QT_VERSION >= 0x040600
106  // Tell Qt that we directly use OpenGL
107  _painter->beginNativePainting();
108  #endif
109 
110  static bool initialized = false;
111  if (!initialized)
112  {
113  // we use GLEW to manage extensions
114  // initialize it first
115  glewInit();
116  for (unsigned int i = 0; i < views_->size (); i++)
117  {
118  views_->at(i)->initializeGL ();
119  }
120  if (cursorPainter_)
121  cursorPainter_->initializeGL ();
122  initialized = true;
123  }
124 
125  // Update the cursor position in all viewers
126  if (cursorPainter_ && cursorPainter_->enabled())
127  {
128  // avoid projection matrix stack overflow
129  GLdouble mat[16];
130  glGetDoublev(GL_PROJECTION_MATRIX, mat);
131 
132  glMatrixMode(GL_MODELVIEW);
133  glPushMatrix ();
134 
135  glPushAttrib (GL_ALL_ATTRIB_BITS);
136  for (unsigned int i = 0; i < views_->size (); i++)
137  {
138  if (views_->at(i)->isVisible())
139  views_->at(i)->updateCursorPosition(cursorPainter_->cursorPosition ());
140  }
141  glPopAttrib ();
142 
143  glMatrixMode(GL_PROJECTION);
144  glLoadMatrixd (mat);
145  glMatrixMode(GL_MODELVIEW);
146  glPopMatrix ();
147  }
148 
149  // Clear the depth buffer (This is required since QT4.6 Otherwise we get an emtpty scene!
150  glClear(GL_DEPTH_BUFFER_BIT);
151 
152  // Paint the viewers
153  for (unsigned int i = 0; i < views_->size (); i++)
154  {
155  if (views_->at(i)->isVisible())
156  views_->at(i)->paintGL();
157  }
158 
159  #if QT_VERSION >= 0x040600
160  // The rest is painting through QT again.
161  _painter->endNativePainting();
162  #endif
163 
164  // Draw red box around active examiner
165  if (layout_->mode() != QtMultiViewLayout::SingleView)
166  {
167  glViewer *v = views_->at(PluginFunctions::activeExaminer());
168 
169  QPen pen(Qt::red);
170  pen.setWidth (2);
171  _painter->setPen(pen);
172  _painter->drawLine(v->scenePos().x(), v->scenePos().y(),
173  v->scenePos().x(),
174  v->scenePos().y() + v->size().height() - 1);
175  _painter->drawLine(v->scenePos().x() + v->size().width(), v->scenePos().y(),
176  v->scenePos().x() + v->size().width(),
177  v->scenePos().y() + v->size().height() - 1);
178  _painter->drawLine(v->scenePos().x(), v->scenePos().y() - 1,
179  v->scenePos().x() + v->size().width(),
180  v->scenePos().y() - 1);
181  _painter->drawLine(v->scenePos().x(),
182  v->scenePos().y() + v->size().height() - 1,
183  v->scenePos().x() + v->size().width(),
184  v->scenePos().y() + v->size().height() - 1);
185  }
186 }
187 
188 //-----------------------------------------------------------------------------
189 
190 glViewer* QtGLGraphicsScene::findView (const QPointF &_p, bool _setActive)
191 {
192  for (unsigned int i = 0; i < views_->size (); i++)
193  {
194  if (views_->at(i)->contains(views_->at(i)->mapFromScene (_p)))
195  {
196  if (_setActive && PluginFunctions::activeExaminer() != i)
197  {
199  update();
200  }
201  return views_->at(i);
202  }
203  }
204  return NULL;
205 }
206 
207 //-----------------------------------------------------------------------------
208 
209 void QtGLGraphicsScene::mouseMoveEvent(QGraphicsSceneMouseEvent* _e)
210 {
211  QGraphicsScene::mouseMoveEvent(_e);
212  if (_e->isAccepted())
213  return;
214 
215  glViewer *v = findView (_e->scenePos());
216  if (!v)
217  return;
218 
219  v->mouseMoveEvent(_e);
220 }
221 
222 //-----------------------------------------------------------------------------
223 
224 void QtGLGraphicsScene::setCursorPainter(CursorPainter * _cursorPainter)
225 {
226  cursorPainter_ = _cursorPainter;
227 }
228 
229 //-----------------------------------------------------------------------------
230 
231 bool QtGLGraphicsScene::event(QEvent *_event)
232 {
233  if (cursorPainter_ && _event->type() == QEvent::Enter)
234  {
235  cursorPainter_->setMouseIn (true);
236  }
237  else if (cursorPainter_ && _event->type() == QEvent::Leave)
238  {
239  cursorPainter_->setMouseIn (false);
240  update ();
241  }
242  else if (cursorPainter_ && _event->type() == QEvent::GraphicsSceneMouseMove)
243  {
244  QGraphicsSceneMouseEvent *e = static_cast<QGraphicsSceneMouseEvent*>(_event);
245  cursorPainter_->updateCursorPosition (e->scenePos ());
246  update ();
247  }
248 
249  return QGraphicsScene::event (_event);
250 }
251 
252 
253 //=============================================================================
254 //=============================================================================
255 
void setActiveExaminer(const unsigned int _id)
Set the active id of the examiner which got the last mouse events.
virtual void mouseMoveEvent(QGraphicsSceneMouseEvent *_event)
handle mouse move events
unsigned int activeExaminer()
Get the id of the examiner which got the last mouse events.