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Diffstat (limited to 'examples/painting/concentriccircles/circlewidget.cpp')
-rw-r--r-- | examples/painting/concentriccircles/circlewidget.cpp | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/examples/painting/concentriccircles/circlewidget.cpp b/examples/painting/concentriccircles/circlewidget.cpp new file mode 100644 index 0000000..ab62a88 --- /dev/null +++ b/examples/painting/concentriccircles/circlewidget.cpp @@ -0,0 +1,125 @@ +/**************************************************************************** +** +** 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 <QtGui> + +#include "circlewidget.h" + +#include <stdlib.h> + +//! [0] +CircleWidget::CircleWidget(QWidget *parent) + : QWidget(parent) +{ + floatBased = false; + antialiased = false; + frameNo = 0; + + setBackgroundRole(QPalette::Base); + setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding); +} +//! [0] + +//! [1] +void CircleWidget::setFloatBased(bool floatBased) +{ + this->floatBased = floatBased; + update(); +} +//! [1] + +//! [2] +void CircleWidget::setAntialiased(bool antialiased) +{ + this->antialiased = antialiased; + update(); +} +//! [2] + +//! [3] +QSize CircleWidget::minimumSizeHint() const +{ + return QSize(50, 50); +} +//! [3] + +//! [4] +QSize CircleWidget::sizeHint() const +{ + return QSize(180, 180); +} +//! [4] + +//! [5] +void CircleWidget::nextAnimationFrame() +{ + ++frameNo; + update(); +} +//! [5] + +//! [6] +void CircleWidget::paintEvent(QPaintEvent *) +{ + QPainter painter(this); + painter.setRenderHint(QPainter::Antialiasing, antialiased); + painter.translate(width() / 2, height() / 2); +//! [6] + +//! [7] + for (int diameter = 0; diameter < 256; diameter += 9) { + int delta = abs((frameNo % 128) - diameter / 2); + int alpha = 255 - (delta * delta) / 4 - diameter; +//! [7] //! [8] + 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)); + } + } + } +} +//! [8] |