Unable to set the view port for graphicsview

[A9am]

Hi,

If I am using setviewport for the graphicsview , I am getting a transparent screen .

view->setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));

Can anyone please suggest any solution?


Thanks

[Jonny174]

MainWindow::MainWindow( QWidget *parent ):
  QMainWindow( parent )
{
  GraphicsView *view = new GraphicsView;
  view->setViewport( new QGLWidget( QGLFormat( QGL::SampleBuffers | QGL::AlphaChannel | QGL::Rgba ) ) );
  view->setViewportUpdateMode( QGraphicsView::FullViewportUpdate );
  view->setScene( new OpenGLScene );
 
  resize( 320, 240 );
  setCentralWidget( view );
}
 
GraphicsView::GraphicsView()
{
}
 
void GraphicsView::resizeEvent( QResizeEvent *e )
{
  if (scene())
    scene()->setSceneRect( QRect( QPoint( 0, 0 ), e->size() ) );
 
  QGraphicsView::resizeEvent(e);
}
 
OpenGLScene::OpenGLScene()
{
}
 
OpenGLScene::~OpenGLScene()
{
}
 
void OpenGLScene::drawBackground( QPainter */*painter*/, const QRectF &/*rect*/ )
{
  glClearColor( 1.0f, 1.0f, 1.0f, 1.0f );
  glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 
  glMatrixMode( GL_PROJECTION );
 
  glPushMatrix();
    glLoadIdentity();
    glViewport( 0, 0, int( width() ), int( height() ) );
    //glOrtho( -width() / 2.0, width() / 2.0, -height() / 2.0, height() / 2.0, -1.0, 1000.0 );
    glOrtho( 0.0, width(), height(), 0.0, -1.0, 1000.0 );
 
    glMatrixMode( GL_MODELVIEW );
    glPushMatrix();
      glLoadIdentity();
      // DRAW HERE
    glPopMatrix();
  glPopMatrix();
 
  //QTimer::singleShot( 1, this, SLOT(update()) );
}

MainWindow::MainWindow( QWidget *parent ):
  QMainWindow( parent )
{
  GraphicsView *view = new GraphicsView;
  view->setViewport( new QGLWidget( QGLFormat( QGL::SampleBuffers | QGL::AlphaChannel | QGL::Rgba ) ) );
  view->setViewportUpdateMode( QGraphicsView::FullViewportUpdate );
  view->setScene( new OpenGLScene );

  resize( 320, 240 );
  setCentralWidget( view );
}

GraphicsView::GraphicsView()
{
}

void GraphicsView::resizeEvent( QResizeEvent *e )
{
  if (scene())
    scene()->setSceneRect( QRect( QPoint( 0, 0 ), e->size() ) );

  QGraphicsView::resizeEvent(e);
}

OpenGLScene::OpenGLScene()
{
}

OpenGLScene::~OpenGLScene()
{
}

void OpenGLScene::drawBackground( QPainter */*painter*/, const QRectF &/*rect*/ )
{
  glClearColor( 1.0f, 1.0f, 1.0f, 1.0f );
  glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );

  glMatrixMode( GL_PROJECTION );

  glPushMatrix();
    glLoadIdentity();
    glViewport( 0, 0, int( width() ), int( height() ) );
    //glOrtho( -width() / 2.0, width() / 2.0, -height() / 2.0, height() / 2.0, -1.0, 1000.0 );
    glOrtho( 0.0, width(), height(), 0.0, -1.0, 1000.0 );

    glMatrixMode( GL_MODELVIEW );
    glPushMatrix();
      glLoadIdentity();
      // DRAW HERE
    glPopMatrix();
  glPopMatrix();

  //QTimer::singleShot( 1, this, SLOT(update()) );
}

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