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diff --git a/examples/effects/lighting/shadoweffect.cpp b/examples/effects/lighting/shadoweffect.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 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 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 "shadoweffect.h"
+
+#include <math.h>
+
+ShadowEffect::ShadowEffect(QGraphicsItem *item, QGraphicsItem *source)
+    : QGraphicsDropShadowEffect()
+    , item(item), m_lightSource(source)
+{
+    setBlurRadius(8);
+    m_color = color();
+}
+
+void ShadowEffect::adjustForItem()
+{
+    QPointF delta = item->pos() - m_lightSource->pos();
+    setOffset(delta.toPoint() / 30);
+
+    qreal dx = delta.x();
+    qreal dy = delta.y();
+    qreal dd = sqrt(dx * dx + dy * dy);
+    m_color.setAlphaF(qBound(0.4, 1 - dd / 200.0, 0.7));
+    setColor(m_color);
+}
+
+QRectF ShadowEffect::boundingRectFor(const QRectF &rect) const
+{
+    const_cast<ShadowEffect *>(this)->adjustForItem();
+    return QGraphicsDropShadowEffect::boundingRectFor(rect);
+}
+
+void ShadowEffect::draw(QPainter *painter, QGraphicsEffectSource *source)
+{
+    adjustForItem();
+    QGraphicsDropShadowEffect::draw(painter, source);
+}