1 files changed, 108 insertions, 0 deletions
diff --git a/doc/src/snippets/alphachannel.cpp b/doc/src/snippets/alphachannel.cpp
new file mode 100644
index 0000000000..d5ec20e60c
--- /dev/null
+++ b/doc/src/snippets/alphachannel.cpp
@@ -0,0 +1,108 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+**     the names of its contributors may be used to endorse or promote
+**     products derived from this software without specific prior written
+**     permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <qapplication.h>
+#include <qlabel.h>
+#include <qpixmap.h>
+#include <qprinter.h>
+#include <qpainter.h>
+#include <qfile.h>
+#include <qdir.h>
+#include <qfileinfo.h>
+#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;
+}