<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>Qt 4.6: lighting.cpp Example File (effects/lighting/lighting.cpp)</title>
<link href="classic.css" rel="stylesheet" type="text/css" />
</head>
<body>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td align="left" valign="top" width="32"><a href="http://qt.nokia.com/"><img src="images/qt-logo.png" align="left" border="0" /></a></td>
<td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="functions.html"><font color="#004faf">All Functions</font></a> · <a href="overviews.html"><font color="#004faf">Overviews</font></a></td></tr></table><h1 class="title">lighting.cpp Example File<br /><span class="small-subtitle">effects/lighting/lighting.cpp</span>
</h1>
<pre><span class="comment"> /****************************************************************************
**
** Copyright (C) 2010 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.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** 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.
**
** 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 have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/</span>
#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, 1));
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();
}</pre>
<p /><address><hr /><div align="center">
<table width="100%" cellspacing="0" border="0"><tr class="address">
<td width="40%" align="left">Copyright © 2010 Nokia Corporation and/or its subsidiary(-ies)</td>
<td width="20%" align="center"><a href="trademarks.html">Trademarks</a></td>
<td width="40%" align="right"><div align="right">Qt 4.6.3</div></td>
</tr></table></div></address></body>
</html>
distrib
>
Mandriva
>
current
>
i586
>
media
>
main-updates
>
by-pkgid
>
8e6051afcdb111a0317a58fb64c2abf5
>
files
>
762
