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#pragma once
#include <QtGui>

class CMainWindow:public QMainWindow
{
public:
	CMainWindow(QString pathParam);
	~CMainWindow(void);
private:
	QString path;
	QPixmap *pixmap;

    virtual void resizeEvent (QResizeEvent * event);
    virtual void paintEvent (QPaintEvent * event);
};

---------------------------


#include "MainWindow.h"

CMainWindow::CMainWindow(QString pathParam)
{
   path=pathParam;
   pixmap=new QPixmap("e:\\anyshape\\debug\\01.bmp");

}

CMainWindow::~CMainWindow(void)
{
}

void CMainWindow::resizeEvent (QResizeEvent * event)
{
    setMask(pixmap->mask());
};

void CMainWindow::paintEvent (QPaintEvent * event)
{
    QRegion r1(pixmap->rect());
    QPainter painter(this);

    painter.setClipRegion(r1);
    painter.drawPixmap(pixmap->rect(), *pixmap);

};

QRegion  rgn( int 0, int 0, int 100, int 100, QRegion::Ellipse);

this->setMask(rgn);