1 files changed, 114 insertions, 0 deletions
diff --git a/doc/src/snippets/alphachannel.cpp b/doc/src/snippets/alphachannel.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <qapplication.h>
+#include <qlabel.h>
+#include <qpixmap.h>
+#include <qprinter.h>
+#include <qpainter.h>
+#include <qfile.h>
+#include <qdir.h>
+#include <qfileinfo.h>
+
+#if (QT_VERSION) >= 0x040000
+#include <QtGui>
+#include <QtCore>
+#endif
+
+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;
+}