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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** 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 Nokia Corporation and its Subsidiary(-ies) 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 <QtGui>
#include "bubble.h"
Bubble::Bubble(const QPointF &position, qreal radius, const QPointF &velocity)
: position(position), vel(velocity), radius(radius)
{
innerColor = randomColor();
outerColor = randomColor();
cache = 0;
updateBrush();
}
//! [0]
void Bubble::updateCache()
{
if (cache)
delete cache;
cache = new QImage(qRound(radius * 2 + 2), qRound(radius * 2 + 2), QImage::Format_ARGB32);
cache->fill(0x00000000);
QPainter p(cache);
p.setRenderHint(QPainter::HighQualityAntialiasing);
QPen pen(Qt::white);
pen.setWidth(2);
p.setPen(pen);
p.setBrush(brush);
p.drawEllipse(0, 0, int(2*radius), int(2*radius));
}
//! [0]
Bubble::~Bubble()
{
if (cache)
delete cache;
}
void Bubble::updateBrush()
{
QRadialGradient gradient(QPointF(radius, radius), radius,
QPointF(radius*0.5, radius*0.5));
gradient.setColorAt(0, QColor(255, 255, 255, 255));
gradient.setColorAt(0.25, innerColor);
gradient.setColorAt(1, outerColor);
brush = QBrush(gradient);
updateCache();
}
//! [1]
void Bubble::drawBubble(QPainter *painter)
{
painter->save();
painter->translate(position.x() - radius, position.y() - radius);
painter->setOpacity(0.8);
painter->drawImage(0, 0, *cache);
painter->restore();
}
//! [1]
QColor Bubble::randomColor()
{
int red = int(185 + 70.0*qrand()/(RAND_MAX+1.0));
int green = int(185 + 70.0*qrand()/(RAND_MAX+1.0));
int blue = int(205 + 50.0*qrand()/(RAND_MAX+1.0));
int alpha = int(91 + 100.0*qrand()/(RAND_MAX+1.0));
return QColor(red, green, blue, alpha);
}
void Bubble::move(const QRect &bbox)
{
position += vel;
qreal leftOverflow = position.x() - radius - bbox.left();
qreal rightOverflow = position.x() + radius - bbox.right();
qreal topOverflow = position.y() - radius - bbox.top();
qreal bottomOverflow = position.y() + radius - bbox.bottom();
if (leftOverflow < 0.0) {
position.setX(position.x() - 2 * leftOverflow);
vel.setX(-vel.x());
} else if (rightOverflow > 0.0) {
position.setX(position.x() - 2 * rightOverflow);
vel.setX(-vel.x());
}
if (topOverflow < 0.0) {
position.setY(position.y() - 2 * topOverflow);
vel.setY(-vel.y());
} else if (bottomOverflow > 0.0) {
position.setY(position.y() - 2 * bottomOverflow);
vel.setY(-vel.y());
}
}
QRectF Bubble::rect()
{
return QRectF(position.x() - radius, position.y() - radius,
2 * radius, 2 * radius);
}
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