--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/effects/lighting/lighting.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,137 @@
+/****************************************************************************
+**
+** 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 "lighting.h"
+
+#include <QtGui>
+
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
+Lighting::Lighting(QWidget *parent): QGraphicsView(parent), angle(0.0)
+{
+    setScene(&m_scene);
+
+    setupScene();
+
+    QTimer *timer = new QTimer(this);
+    connect(timer, SIGNAL(timeout()), SLOT(animate()));
+    timer->setInterval(30);
+    timer->start();
+
+    setRenderHint(QPainter::Antialiasing, true);
+    setFrameStyle(QFrame::NoFrame);
+}
+
+void Lighting::setupScene()
+{
+    m_scene.setSceneRect(-300, -200, 600, 460);
+
+    QLinearGradient linearGrad(QPointF(-100, -100), QPointF(100, 100));
+    linearGrad.setColorAt(0, QColor(255, 255, 255));
+    linearGrad.setColorAt(1, QColor(192, 192, 255));
+    setBackgroundBrush(linearGrad);
+
+    QRadialGradient radialGrad(30, 30, 30);
+    radialGrad.setColorAt(0, Qt::yellow);
+    radialGrad.setColorAt(0.2, Qt::yellow);
+    radialGrad.setColorAt(1, Qt::transparent);
+    QPixmap pixmap(60, 60);
+    pixmap.fill(Qt::transparent);
+    QPainter painter(&pixmap);
+    painter.setPen(Qt::NoPen);
+    painter.setBrush(radialGrad);
+    painter.drawEllipse(0, 0, 60, 60);
+    painter.end();
+
+    m_lightSource = m_scene.addPixmap(pixmap);
+    m_lightSource->setZValue(2);
+
+    for (int i = -2; i < 3; ++i)
+        for (int j = -2; j < 3; ++j) {
+            QAbstractGraphicsShapeItem *item;
+            if ((i + j) & 1)
+                item = new QGraphicsEllipseItem(0, 0, 50, 50);
+            else
+                item = new QGraphicsRectItem(0, 0, 50, 50);
+
+            item->setPen(QPen(Qt::black));
+            item->setBrush(QBrush(Qt::white));
+            QGraphicsDropShadowEffect *effect = new QGraphicsDropShadowEffect;
+            effect->setBlurRadius(8);
+            item->setGraphicsEffect(effect);
+            item->setZValue(1);
+            item->setPos(i * 80, j * 80);
+            m_scene.addItem(item);
+            m_items << item;
+        }
+
+
+}
+
+void Lighting::animate()
+{
+    angle += (M_PI / 30);
+    qreal xs = 200 * sin(angle) - 40 + 25;
+    qreal ys = 200 * cos(angle) - 40 + 25;
+    m_lightSource->setPos(xs, ys);
+
+    for (int i = 0; i < m_items.size(); ++i) {
+        QGraphicsItem *item = m_items.at(i);
+        Q_ASSERT(item);
+        QGraphicsDropShadowEffect *effect = static_cast<QGraphicsDropShadowEffect *>(item->graphicsEffect());
+        Q_ASSERT(effect);
+
+        QPointF delta(item->x() - xs, item->y() - ys);
+        effect->setOffset(delta.toPoint() / 30);
+
+        qreal dx = delta.x();
+        qreal dy = delta.y();
+        qreal dd = sqrt(dx * dx + dy * dy);
+        QColor color = effect->color();
+        color.setAlphaF(qBound(0.4, 1 - dd / 200.0, 0.7));
+        effect->setColor(color);
+    }
+
+    m_scene.update();
+}
+