widget.h:
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include<QPainter>
#include<QPaintEvent>
#include<QPaintDevice>
class Widget : public QWidget
{
Q_OBJECT
public:
Widget(QWidget *parent = 0);
~Widget();
protected:
void paintEvent(QPaintEvent *);
};
#endif // WIDGET_H
widget.cpp:
#include "widget.h"
Widget::Widget(QWidget *parent)
: QWidget(parent)
{
}
Widget::~Widget()
{
}
void Widget::paintEvent(QPaintEvent *)
{
QPainter painter(this);
painter.setPen(Qt::blue);
painter.setFont(QFont("Arial",30));
painter.drawText(rect(),Qt::AlignCenter,"Qt");
painter.drawEllipse(QRect(0,0,width()-1,height()-1));
}