cd46a2daf5
Update files using old header.LGPL3 to header.LGPL Update files using old FDL template to use new one Update files using old BSD template to use new one Change-Id: I36a78272516f9953d02956522f285b40adfc8915 Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
132 lines
4.0 KiB
C++
132 lines
4.0 KiB
C++
/****************************************************************************
|
|
**
|
|
** Copyright (C) 2016 The Qt Company Ltd.
|
|
** Contact: https://www.qt.io/licensing/
|
|
**
|
|
** This file is part of the examples of the Qt Toolkit.
|
|
**
|
|
** $QT_BEGIN_LICENSE:BSD$
|
|
** Commercial License Usage
|
|
** Licensees holding valid commercial Qt licenses may use this file in
|
|
** accordance with the commercial license agreement provided with the
|
|
** Software or, alternatively, in accordance with the terms contained in
|
|
** a written agreement between you and The Qt Company. For licensing terms
|
|
** and conditions see https://www.qt.io/terms-conditions. For further
|
|
** information use the contact form at https://www.qt.io/contact-us.
|
|
**
|
|
** BSD License Usage
|
|
** Alternatively, you may use this file under the terms of the BSD license
|
|
** as follows:
|
|
**
|
|
** "Redistribution and use in source and binary forms, with or without
|
|
** modification, are permitted provided that the following conditions are
|
|
** met:
|
|
** * Redistributions of source code must retain the above copyright
|
|
** notice, this list of conditions and the following disclaimer.
|
|
** * Redistributions in binary form must reproduce the above copyright
|
|
** notice, this list of conditions and the following disclaimer in
|
|
** the documentation and/or other materials provided with the
|
|
** distribution.
|
|
** * Neither the name of The Qt Company Ltd nor the names of its
|
|
** contributors may be used to endorse or promote products derived
|
|
** from this software without specific prior written permission.
|
|
**
|
|
**
|
|
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
|
|
**
|
|
** $QT_END_LICENSE$
|
|
**
|
|
****************************************************************************/
|
|
|
|
#include "circlewidget.h"
|
|
|
|
#include <QPainter>
|
|
|
|
#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]
|