diff options
Diffstat (limited to 'examples/opengl/qopenglwidget/bubble.cpp')
-rw-r--r-- | examples/opengl/qopenglwidget/bubble.cpp | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/examples/opengl/qopenglwidget/bubble.cpp b/examples/opengl/qopenglwidget/bubble.cpp new file mode 100644 index 0000000000..bf04c64966 --- /dev/null +++ b/examples/opengl/qopenglwidget/bubble.cpp @@ -0,0 +1,139 @@ +/**************************************************************************** +** +** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** 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 Digia Plc 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 <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); + 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); +} |