#include <QApplication>
#include <QDebug>
#include <QFile>
#include <QFont>
#include <QElapsedTimer>
#include <QPainter>
#include <QWidget>


class CMainWindow : public QWidget{
public:
    CMainWindow():QWidget(){
        move(0,0);
        resize(500, 250);
    }

    void paintEvent(QPaintEvent *){
        QPainter myPainter;
        QPainterPath path;
        QPen myPen;
        myPainter.begin(this);
        QElapsedTimer timer;

        QFile file("pathdata.dat");
        if(!file.open(QIODevice::ReadOnly))
            return;
        QDataStream in(&file);
        in>>path;
        file.close();
        myPen=myPainter.pen();

        timer.start();
        myPainter.drawPath(path);
        qDebug() << "drawpath time with default painter:" << timer.restart() << "milliseconds";

        myPen.setWidth(2);
        myPainter.setPen(myPen);
        myPainter.drawPath(path);
        qDebug() << "drawpath time with lines two pixels wide:" << timer.restart() << "milliseconds";
    }
};

 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);
     CMainWindow w;
     w.show();
     return app.exec();
 }