/**************************************************************************** ** ** Copyright (C) 2005-2008 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. ** ****************************************************************************/ #include <QtGui> #include "circlewidget.h" #include <stdlib.h> CircleWidget::CircleWidget(QWidget *parent) : QWidget(parent) { floatBased = false; antialiased = false; frameNo = 0; setBackgroundRole(QPalette::Base); setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding); } void CircleWidget::setFloatBased(bool floatBased) { this->floatBased = floatBased; update(); } void CircleWidget::setAntialiased(bool antialiased) { this->antialiased = antialiased; update(); } QSize CircleWidget::minimumSizeHint() const { return QSize(50, 50); } QSize CircleWidget::sizeHint() const { return QSize(180, 180); } void CircleWidget::nextAnimationFrame() { ++frameNo; update(); } void CircleWidget::paintEvent(QPaintEvent *) { QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing, antialiased); painter.translate(width() / 2, height() / 2); for (int diameter = 0; diameter < 256; diameter += 9) { int delta = abs((frameNo % 128) - diameter / 2); int alpha = 255 - (delta * delta) / 4 - diameter; if (alpha > 0) { painter.setPen(QPen(QColor(0, diameter / 2, 127, alpha), 3)); if (floatBased) { painter.drawEllipse(QRectF(-diameter / 2.0, -diameter / 2.0, diameter, diameter)); } else { painter.drawEllipse(QRect(-diameter / 2, -diameter / 2, diameter, diameter)); } } } }