<?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 4.3: bubble.cpp Example File (opengl/overpainting/bubble.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://www.trolltech.com/products/qt"><img src="images/qt-logo.png" align="left" width="32" height="32" 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="mainclasses.html"><font color="#004faf">Main Classes</font></a> · <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> · <a href="modules.html"><font color="#004faf">Modules</font></a> · <a href="functions.html"><font color="#004faf">Functions</font></a></td> <td align="right" valign="top" width="230"><a href="http://www.trolltech.com"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></a></td></tr></table><h1 align="center">bubble.cpp Example File<br /><sup><sup>opengl/overpainting/bubble.cpp</sup></sup></h1> <pre><span class="comment"> /**************************************************************************** ** ** Copyright (C) 2006-2008 Trolltech ASA. All rights reserved. ** ** This file is part of the example classes of the Qt Toolkit. ** ** This file may be used under the terms of the GNU General Public ** License versions 2.0 or 3.0 as published by the Free Software ** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3 ** included in the packaging of this file. Alternatively you may (at ** your option) use any later version of the GNU General Public ** License if such license has been publicly approved by Trolltech ASA ** (or its successors, if any) and the KDE Free Qt Foundation. In ** addition, as a special exception, Trolltech gives you certain ** additional rights. These rights are described in the Trolltech GPL ** Exception version 1.1, which can be found at ** http://www.trolltech.com/products/qt/gplexception/ and in the file ** GPL_EXCEPTION.txt in this package. ** ** Please review the following information to ensure GNU General ** Public Licensing requirements will be met: ** http://trolltech.com/products/qt/licenses/licensing/opensource/. If ** you are unsure which license is appropriate for your use, please ** review the following information: ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview ** or contact the sales department at sales@trolltech.com. ** ** In addition, as a special exception, Trolltech, as the sole ** copyright holder for Qt Designer, grants users of the Qt/Eclipse ** Integration plug-in the right for the Qt/Eclipse Integration to ** link to functionality provided by Qt Designer and its related ** libraries. ** ** This file is provided "AS IS" with NO WARRANTY OF ANY KIND, ** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly ** granted herein. ** ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. ** ****************************************************************************/</span> #include <QtGui> #include "bubble.h" Bubble::Bubble(const QPointF &position, qreal radius, const QPointF &velocity) : position(position), vel(velocity), radius(radius) { innerColor = randomColor(); outerColor = randomColor(); updateBrush(); } void Bubble::updateBrush() { QRadialGradient gradient(QPointF(radius, radius), radius, QPointF(radius*0.5, radius*0.5)); gradient.setColorAt(0, QColor(255, 255, 255, 255)); gradient.setColorAt(0.25, innerColor); gradient.setColorAt(1, outerColor); brush = QBrush(gradient); } void Bubble::drawBubble(QPainter *painter) { painter->save(); painter->translate(position.x() - radius, position.y() - radius); painter->setBrush(brush); painter->drawEllipse(0, 0, int(2*radius), int(2*radius)); painter->restore(); } QColor Bubble::randomColor() { int red = int(205 + 50.0*qrand()/(RAND_MAX+1.0)); int green = int(205 + 50.0*qrand()/(RAND_MAX+1.0)); int blue = int(205 + 50.0*qrand()/(RAND_MAX+1.0)); int alpha = int(91 + 100.0*qrand()/(RAND_MAX+1.0)); return QColor(red, green, blue, alpha); } void Bubble::move(const QRect &bbox) { position += vel; qreal leftOverflow = position.x() - radius - bbox.left(); qreal rightOverflow = position.x() + radius - bbox.right(); qreal topOverflow = position.y() - radius - bbox.top(); qreal bottomOverflow = position.y() + radius - bbox.bottom(); if (leftOverflow < 0.0) { position.setX(position.x() - 2 * leftOverflow); vel.setX(-vel.x()); } else if (rightOverflow > 0.0) { position.setX(position.x() - 2 * rightOverflow); vel.setX(-vel.x()); } if (topOverflow < 0.0) { position.setY(position.y() - 2 * topOverflow); vel.setY(-vel.y()); } else if (bottomOverflow > 0.0) { position.setY(position.y() - 2 * bottomOverflow); vel.setY(-vel.y()); } } QRectF Bubble::rect() { return QRectF(position.x() - radius, position.y() - radius, 2 * radius, 2 * radius); }</pre> <p /><address><hr /><div align="center"> <table width="100%" cellspacing="0" border="0"><tr class="address"> <td width="30%">Copyright © 2008 <a href="trolltech.html">Trolltech</a></td> <td width="40%" align="center"><a href="trademarks.html">Trademarks</a></td> <td width="30%" align="right"><div align="right">Qt 4.3.4</div></td> </tr></table></div></address></body> </html>