2b75c156b6
Change-Id: I6441ff931dbd33b698d762e6f6784898f3f60fe7 Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
95 lines
3.3 KiB
C++
95 lines
3.3 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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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 The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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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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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "helper.h"
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#include <QPainter>
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#include <QPaintEvent>
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#include <QWidget>
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//! [0]
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Helper::Helper()
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{
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QLinearGradient gradient(QPointF(50, -20), QPointF(80, 20));
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gradient.setColorAt(0.0, Qt::white);
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gradient.setColorAt(1.0, QColor(0xa6, 0xce, 0x39));
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background = QBrush(QColor(64, 32, 64));
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circleBrush = QBrush(gradient);
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circlePen = QPen(Qt::black);
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circlePen.setWidth(1);
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textPen = QPen(Qt::white);
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textFont.setPixelSize(50);
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}
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//! [0]
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//! [1]
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void Helper::paint(QPainter *painter, QPaintEvent *event, int elapsed)
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{
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painter->fillRect(event->rect(), background);
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painter->translate(100, 100);
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//! [1]
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//! [2]
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painter->save();
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painter->setBrush(circleBrush);
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painter->setPen(circlePen);
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painter->rotate(elapsed * 0.030);
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qreal r = elapsed / 1000.0;
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int n = 30;
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for (int i = 0; i < n; ++i) {
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painter->rotate(30);
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qreal factor = (i + r) / n;
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qreal radius = 0 + 120.0 * factor;
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qreal circleRadius = 1 + factor * 20;
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painter->drawEllipse(QRectF(radius, -circleRadius,
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circleRadius * 2, circleRadius * 2));
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}
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painter->restore();
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//! [2]
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//! [3]
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painter->setPen(textPen);
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painter->setFont(textFont);
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painter->drawText(QRect(-50, -50, 100, 100), Qt::AlignCenter, QStringLiteral("Qt"));
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}
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//! [3]
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