05fc3aef53
Replace the current license disclaimer in files by a SPDX-License-Identifier. Files that have to be modified by hand are modified. License files are organized under LICENSES directory. Task-number: QTBUG-67283 Change-Id: Id880c92784c40f3bbde861c0d93f58151c18b9f1 Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org> Reviewed-by: Lars Knoll <lars.knoll@qt.io> Reviewed-by: Jörg Bornemann <joerg.bornemann@qt.io>
85 lines
1.7 KiB
C++
85 lines
1.7 KiB
C++
// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include "circlewidget.h"
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#include <QPainter>
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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, diameter, diameter));
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else
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painter.drawEllipse(QRect(-diameter / 2, -diameter / 2, diameter, diameter));
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}
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}
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}
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//! [8]
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