Painting Problem on Mac

hi Everybody .

I am using Qt 4.2 , on Mac OS

Please execute this code on Mac OS.

After button click setMask called .
when i want to do repainting ,
painting in side the widget is moving .

sample.cpp

Code:

myWidget::myWidget(QWidget *parent): QWidget(parent)
{
	bRgnSet=false;
	QPushButton *quit = new QPushButton("Click", this);
       quit->setFont(QFont("Times", 18, QFont::Bold));
       quit->setGeometry(75,75,30,30);
	 setGeometry(0, 0, 400, 400);
	 connect(quit, SIGNAL(clicked()), this, SLOT(ButtonPressed()));
 
	 m_ptArr1[0] = QPoint(50,50);
	 m_ptArr1[1] = QPoint(380,120);
       m_ptArr1[2] = QPoint(280,350);
	 m_ptArr1[3] = QPoint(80,180);
	 m_ptArr1[4] = QPoint(50,50);
 
}
 
void  myWidget::paintEvent(QPaintEvent *)
{
	  QPainter     painter(this);
        painter.setPen(Qt::blue);
 
	  painter.drawRect(100,100,200,200); 
	  painter.drawEllipse(150,150,100,100);
 
     if(bRgnSet)
	   {
	 	 painter.translate(50,50);
	   }
 
	   if(bRgnSet)
	   {
	    painter.drawEllipse(300,300,50,50);
	    painter.drawLine(0,0,400,400);
	   }
 
}
 
void myWidget::ButtonPressed()
{
	//QRegion  widgetRgn(54,39,200,200,QRegion::Ellipse);
	bRgnSet = true;
	QPolygon  rlPolygon;
	rlPolygon.setPoints(5, m_ptArr1[0].x(), m_ptArr1[0].y(), m_ptArr1[1].x(), m_ptArr1[1].y(), 
		m_ptArr1[2].x(), m_ptArr1[2].y(), m_ptArr1[3].x(), m_ptArr1[3].y(), m_ptArr1[4].x(), m_ptArr1[4].y(),
		m_ptArr1[5].x(), m_ptArr1[5].y());
	QRegion  rlRegion(rlPolygon);
      setMask( rlPolygon );
	//setMask( widgetRgn );
 
} 
 
int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);
     myWidget     widget;
 
	 widget.show();
	 return app.exec();
 }

sample.h

Code:

class   myWidget: public  QWidget
{
Q_OBJECT
public:
                QPoint	m_ptArr1[5];
			bool bRgnSet;
			myWidget(QWidget *parent = 0);
                void  paintEvent(QPaintEvent *);
 
public slots:
			void ButtonPressed();
};

Add appropriate header files to sample .cpp & sample.h

Implement repaint after clicking the button .

Any body knows the reason pls revert me back .

Thankyou

Shyam Boga