1fdfc2abfe
Change-Id: I02f2c620296fcd91d4967d58767ea33fc4e1e7dc Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>
140 lines
4.5 KiB
C++
140 lines
4.5 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: Nokia Corporation (qt-info@nokia.com)
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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 "bubble.h"
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Bubble::Bubble(const QPointF &position, qreal radius, const QPointF &velocity)
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: position(position), vel(velocity), radius(radius)
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{
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innerColor = randomColor();
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outerColor = randomColor();
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cache = 0;
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updateBrush();
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}
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//! [0]
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void Bubble::updateCache()
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{
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if (cache)
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delete cache;
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cache = new QImage(qRound(radius * 2 + 2), qRound(radius * 2 + 2), QImage::Format_ARGB32);
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cache->fill(0x00000000);
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QPainter p(cache);
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p.setRenderHint(QPainter::HighQualityAntialiasing);
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QPen pen(Qt::white);
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pen.setWidth(2);
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p.setPen(pen);
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p.setBrush(brush);
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p.drawEllipse(0, 0, int(2*radius), int(2*radius));
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}
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//! [0]
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Bubble::~Bubble()
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{
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if (cache)
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delete cache;
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}
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void Bubble::updateBrush()
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{
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QRadialGradient gradient(QPointF(radius, radius), radius,
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QPointF(radius*0.5, radius*0.5));
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gradient.setColorAt(0, QColor(255, 255, 255, 255));
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gradient.setColorAt(0.25, innerColor);
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gradient.setColorAt(1, outerColor);
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brush = QBrush(gradient);
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updateCache();
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}
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//! [1]
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void Bubble::drawBubble(QPainter *painter)
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{
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painter->save();
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painter->translate(position.x() - radius, position.y() - radius);
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painter->setOpacity(0.8);
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painter->drawImage(0, 0, *cache);
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painter->restore();
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}
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//! [1]
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QColor Bubble::randomColor()
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{
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int red = int(185 + 70.0*qrand()/(RAND_MAX+1.0));
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int green = int(185 + 70.0*qrand()/(RAND_MAX+1.0));
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int blue = int(205 + 50.0*qrand()/(RAND_MAX+1.0));
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int alpha = int(91 + 100.0*qrand()/(RAND_MAX+1.0));
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return QColor(red, green, blue, alpha);
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}
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void Bubble::move(const QRect &bbox)
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{
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position += vel;
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qreal leftOverflow = position.x() - radius - bbox.left();
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qreal rightOverflow = position.x() + radius - bbox.right();
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qreal topOverflow = position.y() - radius - bbox.top();
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qreal bottomOverflow = position.y() + radius - bbox.bottom();
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if (leftOverflow < 0.0) {
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position.setX(position.x() - 2 * leftOverflow);
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vel.setX(-vel.x());
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} else if (rightOverflow > 0.0) {
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position.setX(position.x() - 2 * rightOverflow);
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vel.setX(-vel.x());
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}
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if (topOverflow < 0.0) {
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position.setY(position.y() - 2 * topOverflow);
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vel.setY(-vel.y());
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} else if (bottomOverflow > 0.0) {
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position.setY(position.y() - 2 * bottomOverflow);
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vel.setY(-vel.y());
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}
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}
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QRectF Bubble::rect()
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{
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return QRectF(position.x() - radius, position.y() - radius,
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2 * radius, 2 * radius);
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}
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