#include <QApplication>
#include <QMainWindow>
#include <QPushButton>
#include <QRegion>

int main(int argc, char *argv[])
{
	QApplication app(argc, argv);
	QMainWindow *window = new QMainWindow();  
    
        window->setWindowTitle(QString::fromUtf8("Round-Shaped QPushButton"));
        window->resize(300, 250);
	
        QWidget *centralWidget = new QWidget(window);
	
	QPushButton* button = new QPushButton(centralWidget);
	button->setText("Button 1");
	button->setFixedHeight(200);
	button->setFixedWidth(200);
	
	//Set Starting point of region 5 pixels inside , make region width & height
	//values same and less than button size so that we obtain a pure-round shape
	QRegion* region = new QRegion(*(new QRect(button->x()+5,button->y()+5,190,190)),QRegion::Ellipse);
	button->setMask(*region);	
	
	window->setCentralWidget(centralWidget);
	window->show();
	
	return app.exec();

}