143 lines
4.8 KiB
C++
143 lines
4.8 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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** the names of its contributors may be used to endorse or promote
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** products derived from this software without specific prior written
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** permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "lighting.h"
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#include <QtGui>
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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Lighting::Lighting(QWidget *parent): QGraphicsView(parent), angle(0.0)
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{
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setScene(&m_scene);
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setupScene();
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QTimer *timer = new QTimer(this);
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connect(timer, SIGNAL(timeout()), SLOT(animate()));
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timer->setInterval(30);
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timer->start();
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setRenderHint(QPainter::Antialiasing, true);
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setFrameStyle(QFrame::NoFrame);
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}
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void Lighting::setupScene()
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{
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m_scene.setSceneRect(-300, -200, 600, 460);
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QLinearGradient linearGrad(QPointF(-100, -100), QPointF(100, 100));
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linearGrad.setColorAt(0, QColor(255, 255, 255));
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linearGrad.setColorAt(1, QColor(192, 192, 255));
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setBackgroundBrush(linearGrad);
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QRadialGradient radialGrad(30, 30, 30);
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radialGrad.setColorAt(0, Qt::yellow);
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radialGrad.setColorAt(0.2, Qt::yellow);
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radialGrad.setColorAt(1, Qt::transparent);
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QPixmap pixmap(60, 60);
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pixmap.fill(Qt::transparent);
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QPainter painter(&pixmap);
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painter.setPen(Qt::NoPen);
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painter.setBrush(radialGrad);
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painter.drawEllipse(0, 0, 60, 60);
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painter.end();
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m_lightSource = m_scene.addPixmap(pixmap);
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m_lightSource->setZValue(2);
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for (int i = -2; i < 3; ++i)
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for (int j = -2; j < 3; ++j) {
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QAbstractGraphicsShapeItem *item;
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if ((i + j) & 1)
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item = new QGraphicsEllipseItem(0, 0, 50, 50);
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else
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item = new QGraphicsRectItem(0, 0, 50, 50);
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item->setPen(QPen(Qt::black, 1));
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item->setBrush(QBrush(Qt::white));
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QGraphicsDropShadowEffect *effect = new QGraphicsDropShadowEffect;
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effect->setBlurRadius(8);
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item->setGraphicsEffect(effect);
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item->setZValue(1);
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item->setPos(i * 80, j * 80);
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m_scene.addItem(item);
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m_items << item;
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}
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}
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void Lighting::animate()
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{
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angle += (M_PI / 30);
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qreal xs = 200 * sin(angle) - 40 + 25;
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qreal ys = 200 * cos(angle) - 40 + 25;
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m_lightSource->setPos(xs, ys);
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for (int i = 0; i < m_items.size(); ++i) {
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QGraphicsItem *item = m_items.at(i);
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Q_ASSERT(item);
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QGraphicsDropShadowEffect *effect = static_cast<QGraphicsDropShadowEffect *>(item->graphicsEffect());
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Q_ASSERT(effect);
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QPointF delta(item->x() - xs, item->y() - ys);
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effect->setOffset(delta.toPoint() / 30);
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qreal dx = delta.x();
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qreal dy = delta.y();
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qreal dd = sqrt(dx * dx + dy * dy);
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QColor color = effect->color();
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color.setAlphaF(qBound(0.4, 1 - dd / 200.0, 0.7));
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effect->setColor(color);
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}
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m_scene.update();
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}
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void Lighting::resizeEvent(QResizeEvent */*event*/)
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{
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#if defined(Q_OS_SYMBIAN) || defined(Q_WS_MAEMO_5) || defined(Q_WS_SIMULATOR)
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fitInView(sceneRect(), Qt::KeepAspectRatio);
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#endif
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}
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