--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/painting/concentriccircles/circlewidget.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,125 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the examples 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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui>
+
+#include "circlewidget.h"
+
+#include <stdlib.h>
+
+//! [0]
+CircleWidget::CircleWidget(QWidget *parent)
+    : QWidget(parent)
+{
+    floatBased = false;
+    antialiased = false;
+    frameNo = 0;
+
+    setBackgroundRole(QPalette::Base);
+    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
+}
+//! [0]
+
+//! [1]
+void CircleWidget::setFloatBased(bool floatBased)
+{
+    this->floatBased = floatBased;
+    update();
+}
+//! [1]
+
+//! [2]
+void CircleWidget::setAntialiased(bool antialiased)
+{
+    this->antialiased = antialiased;
+    update();
+}
+//! [2]
+
+//! [3]
+QSize CircleWidget::minimumSizeHint() const
+{
+    return QSize(50, 50);
+}
+//! [3]
+
+//! [4]
+QSize CircleWidget::sizeHint() const
+{
+    return QSize(180, 180);
+}
+//! [4]
+
+//! [5]
+void CircleWidget::nextAnimationFrame()
+{
+    ++frameNo;
+    update();
+}
+//! [5]
+
+//! [6]
+void CircleWidget::paintEvent(QPaintEvent *)
+{
+    QPainter painter(this);
+    painter.setRenderHint(QPainter::Antialiasing, antialiased);
+    painter.translate(width() / 2, height() / 2);
+//! [6]
+
+//! [7]
+    for (int diameter = 0; diameter < 256; diameter += 9) {
+        int delta = abs((frameNo % 128) - diameter / 2);
+        int alpha = 255 - (delta * delta) / 4 - diameter;
+//! [7] //! [8]
+        if (alpha > 0) {
+            painter.setPen(QPen(QColor(0, diameter / 2, 127, alpha), 3));
+
+            if (floatBased) {
+                painter.drawEllipse(QRectF(-diameter / 2.0, -diameter / 2.0,
+                                           diameter, diameter));
+            } else {
+                painter.drawEllipse(QRect(-diameter / 2, -diameter / 2,
+                                          diameter, diameter));
+            }
+        }
+    }
+}
+//! [8]