Hi, I am a real beginnner in qt and I have trouble creating a simple qt widget.
#include <QtGui/QWidget>
#ifndef simple_MYWIDGET_H
#define simple_MYWIDGET_H

//namespace simple


/************************************************** ***************************
** Interface [MainWindow]
************************************************** ***************************/
/**
* @brief Qt central, all operations relating to the view part here.
*/

class MyWidget : public QWidget
{


public:
MyWidget(QWidget *parent = 0);
~MyWidget();
public slots:


protected:
void paintEvent(QPaintEvent *event);
private:

};



#endif



#include "../include/simple/mywidget.h"
#include <qpainter.h>


MyWidget::MyWidget( QWidget *parent )
{

}


MyWidget::~MyWidget()
{
}


void MyWidget:aintEvent(QPaintEvent *event)
{
QPainter painter(this);
painter.setRenderHint(QPainter::Antialiasing, true);
painter.setPen(QPen(Qt::black, 12, Qt:ashDotLine, Qt::RoundCap));
painter.setBrush(QBrush(Qt::green, Qt::SolidPattern));
painter.drawEllipse(80, 80, 400, 240);
}


When I run my qt4 designer all i see is a blank screen even though I have promoted my qwidget.
Screenshot from 2013-09-17 10:19:29.jpg