diff options
Diffstat (limited to 'tests/manual/examples/opengl/qopenglwidget/bubble.cpp')
-rw-r--r-- | tests/manual/examples/opengl/qopenglwidget/bubble.cpp | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/tests/manual/examples/opengl/qopenglwidget/bubble.cpp b/tests/manual/examples/opengl/qopenglwidget/bubble.cpp new file mode 100644 index 0000000000..3c32b62113 --- /dev/null +++ b/tests/manual/examples/opengl/qopenglwidget/bubble.cpp @@ -0,0 +1,99 @@ +// Copyright (C) 2016 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +#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(); + updateBrush(); +} + +//! [0] +void Bubble::updateCache() +{ + 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() +{ + 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 + QRandomGenerator::global()->bounded(70)); + int green = int(185 + QRandomGenerator::global()->bounded(70)); + int blue = int(205 + QRandomGenerator::global()->bounded(50)); + int alpha = int(91 + QRandomGenerator::global()->bounded(100)); + + 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); +} |