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Diffstat (limited to 'examples/graphicsview/lighting/shadoweffect.cpp')
-rw-r--r-- | examples/graphicsview/lighting/shadoweffect.cpp | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/examples/graphicsview/lighting/shadoweffect.cpp b/examples/graphicsview/lighting/shadoweffect.cpp new file mode 100644 index 000000000..c1d384ab1 --- /dev/null +++ b/examples/graphicsview/lighting/shadoweffect.cpp @@ -0,0 +1,75 @@ +/**************************************************************************** +** +** 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 *source) + : QGraphicsShadowEffect() + , m_lightSource(source) +{ + setBlurRadius(8); +} + +void ShadowEffect::adjustForItem(const QGraphicsItem *item) +{ + QPointF delta = item->pos() - m_lightSource->pos(); + setShadowOffset(delta.toPoint() / 30); + + qreal dx = delta.x(); + qreal dy = delta.y(); + qreal dd = sqrt(dx * dx + dy * dy); + setOpacity(qBound(0.4, 1 - dd / 200.0, 0.7)); +} + +QRectF ShadowEffect::boundingRectFor(const QGraphicsItem *item) +{ + adjustForItem(item); + return QGraphicsShadowEffect::boundingRectFor(item); +} + +void ShadowEffect::drawItem(QGraphicsItem *item, QPainter *painter, + const QStyleOptionGraphicsItem *option, QWidget *widget) +{ + adjustForItem(item); + QGraphicsShadowEffect::drawItem(item, painter, option, widget); +} |