How render native opengl and mix with QPainter on QwtPolarPlot?

[sampad1370]

Hi
I need to mixed shader render opengl with QPainter that render on QwtPolarPlot that is inside of draw function of QwtPolarItem!!!
but how can do this?
I do that but don't see anything with follow code:

    class Item :public QwtPolarItem
    {
     
     
    	void draw(QPainter *painter, const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap,
    						  const QPointF &pole, double radius, const QRectF &canvasRect)
    	{
    		Q_UNUSED(center);
    		Q_UNUSED(elapsed);
     
    		painter->scale(0.1, 0.1);
    		painter->setPen(...);			
     
    		painter->setRenderHint(QPainter::HighQualityAntialiasing);
     
    		painter->drawPie(...);
     
    		painter->setPen(...);
    		painter->drawEllipse(...);
    		painter->setPen(...);
    		painter->drawLine(...);
     
    		painter->setPen(...);
    		painter->drawEllipse(...);
     
    		painter->save();
     
    		QMatrix mx;
    		mx.reset();
    		painter->setMatrix(mx);
     
    		painter->beginNativePainting();
    		glClearColor(0, 0, 0, 1);
    		glClear(GL_COLOR_BUFFER_BIT);
    		glLoadIdentity();
    		//glTranslatef(center.x(), center.y(), 0);
    		glColor3b(255, 255, 255);
     
    		glBegin(GL_LINES);
    		glVertex2d(0, 0);
    		glVertex2d(100, 0);
    		glVertex2d(0, 100);
    		glVertex2d(100, 100);
    		glEnd();
    		glFlush();
    		painter->endNativePainting();
     
    		painter->restore();
    	}
    ...
    }

Also I know some mistake for example don't set clear color and clear color buffer and flush buffer.
Also I must render first painter then opengl.
please answer me for this code and typical way to render and please say any problem you see in my code.
thanks.