629d6eda5c
Replace Nokia contact email address with Qt Project website. Change-Id: I431bbbf76d7c27d8b502f87947675c116994c415 Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>
125 lines
3.7 KiB
C++
125 lines
3.7 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: http://www.qt-project.org/
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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 <QtWidgets>
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#include "circlewidget.h"
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#include <stdlib.h>
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//! [0]
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CircleWidget::CircleWidget(QWidget *parent)
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: QWidget(parent)
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{
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floatBased = false;
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antialiased = false;
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frameNo = 0;
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setBackgroundRole(QPalette::Base);
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setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
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}
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//! [0]
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//! [1]
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void CircleWidget::setFloatBased(bool floatBased)
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{
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this->floatBased = floatBased;
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update();
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}
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//! [1]
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//! [2]
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void CircleWidget::setAntialiased(bool antialiased)
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{
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this->antialiased = antialiased;
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update();
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}
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//! [2]
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//! [3]
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QSize CircleWidget::minimumSizeHint() const
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{
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return QSize(50, 50);
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}
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//! [3]
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//! [4]
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QSize CircleWidget::sizeHint() const
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{
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return QSize(180, 180);
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}
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//! [4]
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//! [5]
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void CircleWidget::nextAnimationFrame()
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{
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++frameNo;
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update();
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}
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//! [5]
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//! [6]
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void CircleWidget::paintEvent(QPaintEvent *)
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{
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QPainter painter(this);
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painter.setRenderHint(QPainter::Antialiasing, antialiased);
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painter.translate(width() / 2, height() / 2);
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//! [6]
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//! [7]
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for (int diameter = 0; diameter < 256; diameter += 9) {
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int delta = abs((frameNo % 128) - diameter / 2);
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int alpha = 255 - (delta * delta) / 4 - diameter;
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//! [7] //! [8]
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if (alpha > 0) {
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painter.setPen(QPen(QColor(0, diameter / 2, 127, alpha), 3));
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if (floatBased) {
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painter.drawEllipse(QRectF(-diameter / 2.0, -diameter / 2.0,
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diameter, diameter));
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} else {
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painter.drawEllipse(QRect(-diameter / 2, -diameter / 2,
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diameter, diameter));
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}
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}
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}
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}
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//! [8]
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