Developer Documentation
simpleGLGraphicsScene.cc
1 /*===========================================================================*\
2 * *
3 * OpenFlipper *
4  * Copyright (c) 2001-2015, RWTH-Aachen University *
5  * Department of Computer Graphics and Multimedia *
6  * All rights reserved. *
7  * www.openflipper.org *
8  * *
9  *---------------------------------------------------------------------------*
10  * This file is part of OpenFlipper. *
11  *---------------------------------------------------------------------------*
12  * *
13  * Redistribution and use in source and binary forms, with or without *
14  * modification, are permitted provided that the following conditions *
15  * are met: *
16  * *
17  * 1. Redistributions of source code must retain the above copyright notice, *
18  * this list of conditions and the following disclaimer. *
19  * *
20  * 2. Redistributions in binary form must reproduce the above copyright *
21  * notice, this list of conditions and the following disclaimer in the *
22  * documentation and/or other materials provided with the distribution. *
23  * *
24  * 3. Neither the name of the copyright holder nor the names of its *
25  * contributors may be used to endorse or promote products derived from *
26  * this software without specific prior written permission. *
27  * *
28  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS *
29  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED *
30  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
31  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER *
32  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, *
33  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, *
34  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR *
35  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF *
36  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING *
37  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS *
38  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
39 * *
40 \*===========================================================================*/
41 
42 /*===========================================================================*\
43 * *
44 * $Revision$ *
45 * $LastChangedBy$ *
46 * $Date$ *
47 * *
48 \*===========================================================================*/
49 
50 
51 
52 
53 //=============================================================================
54 //
55 // CLASS SimpleGLGraphicsScene - IMPLEMENTATION
56 //
57 //=============================================================================
58 
59 //== INCLUDES =================================================================
60 
61 #include <ACG/GL/acg_glew.hh>
64 #include <OpenFlipper/widgets/glWidget/QtBaseViewer.hh>
65 #include <QApplication>
66 #include <QPainter>
67 #include <QPaintEngine>
68 #include <QGraphicsSceneMouseEvent>
69 
70 #include "simpleGLGraphicsScene.hh"
71 
72 //== NAMESPACES ===============================================================
73 
74 //== IMPLEMENTATION ===========================================================
75 
76 SimpleGLGraphicsScene::SimpleGLGraphicsScene () :
77  QGraphicsScene (),
78  view_(),
79  initialized_(false)
80 {
81  cursorPainter_ = new CursorPainter (this);
82  cursorPainter_->setEnabled( OpenFlipperSettings().value("Core/Gui/glViewer/nativeMouse",false).toBool() );
83 }
84 
85 
86 void SimpleGLGraphicsScene::drawBackground(QPainter *_painter, const QRectF &_rect)
87 {
88 
89  // Check for switch in qt4.6 to OpenGL2
90  #if QT_VERSION >= 0x040600
91  if (_painter->paintEngine()->type() != QPaintEngine::OpenGL && _painter->paintEngine()->type() != QPaintEngine::OpenGL2 ) {
92  std::cerr << "QtGLGraphicsScene: drawBackground needs a QGLWidget to be set as viewport on the graphics view\n";
93  return;
94  }
95  #else
96  if (_painter->paintEngine()->type() != QPaintEngine::OpenGL ) {
97  std::cerr << "QtGLGraphicsScene: drawBackground needs a QGLWidget to be set as viewport on the graphics view\n";
98  return;
99  }
100  #endif
101 
102  // Initialize background first
103  _painter->setBackground(QApplication::palette().window());
104  _painter->eraseRect(_rect);
105 
106  if (!view_)
107  return;
108 
109  // From now on we do OpenGL direct painting on the scene
110  #if QT_VERSION >= 0x040600
111  // Tell Qt that we directly use OpenGL
112  _painter->beginNativePainting();
113  #endif
114 
115  if (!initialized_)
116  {
117  // we use GLEW to manage extensions
118  // initialize it first
119  #ifndef __APPLE__
120  glewInit();
121  #endif
122  view_->initializeGL();
123  cursorPainter_->initializeGL ();
124  initialized_ = true;
125  }
126 
127  if (cursorPainter_->enabled())
128  {
129  // avoid projection matrix stack overflow
130  GLdouble mat[16];
131  glGetDoublev(GL_PROJECTION_MATRIX, mat);
132 
133  glMatrixMode(GL_MODELVIEW);
134  glPushMatrix ();
135 
136  glPushAttrib (GL_ALL_ATTRIB_BITS);
137  view_->updateCursorPosition(cursorPainter_->cursorPosition ());
138  glPopAttrib ();
139 
140  glMatrixMode(GL_PROJECTION);
141  glLoadMatrixd (mat);
142  glMatrixMode(GL_MODELVIEW);
143  glPopMatrix ();
144  glClear(GL_DEPTH_BUFFER_BIT);
145  }
146 
147  // Clear the depth buffer (This is required since QT4.6 Otherwise we get an emtpty scene!
148  glClear(GL_DEPTH_BUFFER_BIT);
149 
150  view_->paintGL();
151 
152  #if QT_VERSION >= 0x040600
153  // The rest is painting through QT again.
154  _painter->endNativePainting();
155  #endif
156 }
157 
158 
159 void SimpleGLGraphicsScene::mouseMoveEvent(QGraphicsSceneMouseEvent* _e)
160 {
161  QGraphicsScene::mouseMoveEvent(_e);
162  if (_e->isAccepted())
163  return;
164 
165  if (view_)
166  view_->mouseMoveEvent(_e);
167 }
168 
169 void SimpleGLGraphicsScene::setView(glViewer * _view)
170 {
171  view_ = _view;
172  cursorPainter_->registerViewer (view_);
173 }
174 
175 //-----------------------------------------------------------------------------
176 
177 bool SimpleGLGraphicsScene::event(QEvent *_event)
178 {
179  if (_event->type() == QEvent::Enter)
180  {
181  cursorPainter_->setMouseIn (true);
182  }
183  else if (_event->type() == QEvent::Leave)
184  {
185  cursorPainter_->setMouseIn (false);
186  update ();
187  }
188  else if (cursorPainter_ && _event->type() == QEvent::GraphicsSceneMouseMove)
189  {
190  QGraphicsSceneMouseEvent *e = static_cast<QGraphicsSceneMouseEvent*>(_event);
191  cursorPainter_->updateCursorPosition (e->scenePos ());
192  update ();
193  }
194  return QGraphicsScene::event (_event);
195 }
196 
197 //=============================================================================
198 //=============================================================================
199 
200 
DLLEXPORT OpenFlipperQSettings & OpenFlipperSettings()
QSettings object containing all program settings of OpenFlipper.