Problem when mixing openGL and QPainter

[sanjayshelke]

here is the related code.....

In order to mix QPainter and openGL i have reimplemented paintEvent().

void QPyramidTool::paintEvent(QPaintEvent *event)
{
 
	QPainter painter;
	painter.begin(this);
 
	resizeGL(width(),height());
	// Rotate the Pyramid and update.
	glClearColor(2.0, 2.0, 2.0, 0.0);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glLoadIdentity();
	glTranslated(0.0, 0.0,-10.0);
	glRotated(m_nXRot / 10.0, 2.0, 0.0, 0.0);
	glRotated(m_nYRot / 10.0, 0.0, 2.0, 0.0);
	glRotated(m_nZRot / 10.0, 0.0, 0.0, 2.0);
 
	glCallList(m_glObject);
 
	event->accept();
}
and the resizeGL() is 
void QPyramidTool::resizeGL(int width, int height)
{
    int side = qMin(width, height);
    glViewport((width - side) / 2, (height - side) / 2, side, side);
 
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(-3.5, +3.5, +3.5, -3.5, 4.0, 20.0);
    glMatrixMode(GL_MODELVIEW);
}

void QPyramidTool::paintEvent(QPaintEvent *event)
{
	
	QPainter painter;
	painter.begin(this);
	
	resizeGL(width(),height());
	// Rotate the Pyramid and update.
	glClearColor(2.0, 2.0, 2.0, 0.0);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glLoadIdentity();
	glTranslated(0.0, 0.0,-10.0);
	glRotated(m_nXRot / 10.0, 2.0, 0.0, 0.0);
	glRotated(m_nYRot / 10.0, 0.0, 2.0, 0.0);
	glRotated(m_nZRot / 10.0, 0.0, 0.0, 2.0);
	
	glCallList(m_glObject);

	event->accept();
}
and the resizeGL() is 
void QPyramidTool::resizeGL(int width, int height)
{
    int side = qMin(width, height);
    glViewport((width - side) / 2, (height - side) / 2, side, side);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(-3.5, +3.5, +3.5, -3.5, 4.0, 20.0);
    glMatrixMode(GL_MODELVIEW);
}

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regards,
sanjay