widget.h:

#ifndef WIDGET_H

#define WIDGET_H

#include <QWidget>

#include<QPainter>

#include<QPaintEvent>

#include<Qtime>

#include<Qtimer>

class Widget : public QWidget

{

    Q_OBJECT

public:

    Widget(QWidget *parent = 0);

    ~Widget();

protected:

    void paintEvent(QPaintEvent *);

    void timerEvent(QTimerEvent * event);

private:

   int x1,y1,x2,y2;

};

#endif // WIDGET_H

widget.cpp:

#include "widget.h"

Widget::Widget(QWidget *parent)

    : QWidget(parent)

{

x1=0;

y1=200;

x2=50;

y2=100;

startTimer(20);

}

Widget::~Widget()

{

}

void Widget::paintEvent(QPaintEvent *)

{

this->resize(800,600);

QPainter painter(this);

QFont font("宋体",20,QFont::Bold,true);

font.setUnderline(true);

font.setOverline(true);

painter.setPen(Qt::red);

painter.setFont(font);

painter.drawText(x1,y1,"欢迎光临");

//painter.drawLine(x1,y1,x2,y2);

}

void  Widget::timerEvent(QTimerEvent * event)

{

x1+=5;

x2+=5;

//repaint();

update();

}