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#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <QMouseEvent>  /* add: QMouseEvent */
 
namespace Ui {
class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
protected:
    void mousePressEvent(QMouseEvent *event);  /* add: mousePressEvent */
    void paintEvent(QPaintEvent *event);  /* add: paintEvent */
 
private:
    Ui::MainWindow *ui;
    QString str_xy; /* add: string (x, y) */
};
 
#endif // MAINWINDOW_H

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QtGui>  /* add QtGui */
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
/* add: mousePressEvent */
void MainWindow::mousePressEvent(QMouseEvent *event)
{
    QString x;
    QString y;
    str_xy = "(" + x.setNum(event->x()) + " ," + y.setNum(event->y()) + ")";
    update();
}
 
/* add paintEvent */
void MainWindow::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    painter.drawText(100, 100, 100, 50, Qt::AlignLeft, str_xy);
}