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https://github.com/crystalidea/qt6windows7.git
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100 lines
2.6 KiB
C++
100 lines
2.6 KiB
C++
// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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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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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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delete cache;
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cache = new QImage(qRound(radius * 2 + 2), qRound(radius * 2 + 2), QImage::Format_ARGB32_Premultiplied);
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cache->fill(0x00000000);
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QPainter p(cache);
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p.setRenderHint(QPainter::Antialiasing);
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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(1, 1, 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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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 + QRandomGenerator::global()->bounded(70));
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int green = int(185 + QRandomGenerator::global()->bounded(70));
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int blue = int(205 + QRandomGenerator::global()->bounded(50));
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int alpha = int(91 + QRandomGenerator::global()->bounded(100));
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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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