2b75c156b6
Change-Id: I6441ff931dbd33b698d762e6f6784898f3f60fe7 Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
140 lines
4.5 KiB
C++
140 lines
4.5 KiB
C++
/****************************************************************************
|
|
**
|
|
** Copyright (C) 2015 The Qt Company Ltd.
|
|
** Contact: http://www.qt.io/licensing/
|
|
**
|
|
** 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 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 <QtWidgets>
|
|
|
|
#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_Premultiplied);
|
|
cache->fill(0x00000000);
|
|
QPainter p(cache);
|
|
p.setRenderHint(QPainter::Antialiasing);
|
|
QPen pen(Qt::white);
|
|
pen.setWidth(2);
|
|
p.setPen(pen);
|
|
p.setBrush(brush);
|
|
p.drawEllipse(1, 1, 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);
|
|
}
|