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#include <qapplication.h>

#include <qlabel.h>

#include <qpixmap.h>

#include <qprinter.h>

#include <qpainter.h>

#include <qfile.h>

#include <qdir.h>

#include <qfileinfo.h>

#include <QtGui>

#include <QtCore>

class MyClass : public QWidget

{

public:

     MyClass(QWidget *parent = 0) : QWidget(parent) { }

protected:

     void paintEvent(QPaintEvent *e)

     {

        /*QRadialGradient rg(50, 50, 50, 50, 50);

         rg.setColorAt(0, QColor::fromRgbF(1, 0, 0, 1));

         rg.setColorAt(1, QColor::fromRgbF(0, 0, 0, 0));

         QPainter pmp(&pm);

         pmp.fillRect(0, 0, 100, 100, rg);

         pmp.end();*/

	createImage();

	QPainter p(this);

	p.fillRect(rect(), Qt::white);

	p.drawPixmap(0, 0, pixmap);

	p.drawPixmap(100, 0, channelImage);

     }

    void createImage()

    {

//! [0]

	pixmap = QPixmap(100, 100);

	pixmap.fill(Qt::transparent);

	QRadialGradient gradient(50, 50, 50, 50, 50);

	gradient.setColorAt(0, QColor::fromRgbF(1, 0, 0, 1));

	gradient.setColorAt(1, QColor::fromRgbF(0, 0, 0, 0));

	QPainter painter(&pixmap);

	painter.fillRect(0, 0, 100, 100, gradient);

	channelImage = pixmap.alphaChannel();

	update();

//! [0]

    }

    QPixmap channelImage, pixmap;

    QSize sizeHint() const { return QSize(500, 500); }

};

int main(int argc, char **argv)

{

     QApplication app(argc, argv);

     MyClass cl;

     cl.show();

     QObject::connect(&app, SIGNAL(lastWindowClosed()), &app, SLOT(quit()));

     int ret = app.exec();

     return ret;

}