qt5base-lts/examples/opengl/paintedwindow/paintedwindow.cpp

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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
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** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, 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.
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** from this software without specific prior written permission.
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**
** 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,
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** $QT_END_LICENSE$
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****************************************************************************/
#include "paintedwindow.h"
#include <QGuiApplication>
#include <QOpenGLContext>
#include <QOpenGLPaintDevice>
#include <QPainter>
#include <QPainterPath>
#include <QScreen>
#include <QTimer>
#include <qmath.h>
PaintedWindow::PaintedWindow()
{
QSurfaceFormat format;
format.setStencilBufferSize(8);
format.setSamples(4);
setSurfaceType(QWindow::OpenGLSurface);
setFlags(Qt::Window | Qt::WindowTitleHint | Qt::WindowSystemMenuHint | Qt::WindowMinMaxButtonsHint | Qt::WindowCloseButtonHint);
setFormat(format);
create();
m_context = new QOpenGLContext(this);
m_context->setFormat(format);
m_context->create();
m_animation = new QPropertyAnimation(this, "rotation");
m_animation->setStartValue(qreal(0));
m_animation->setEndValue(qreal(1));
m_animation->setDuration(500);
QRect screenGeometry = screen()->availableGeometry();
QPoint center = screenGeometry.center();
QRect windowRect = screen()->isLandscape(screen()->orientation()) ? QRect(0, 0, 640, 480) : QRect(0, 0, 480, 640);
setGeometry(QRect(center - windowRect.center(), windowRect.size()));
m_rotation = 0;
reportContentOrientationChange(screen()->orientation());
m_targetOrientation = contentOrientation();
m_nextTargetOrientation = Qt::PrimaryOrientation;
connect(screen(), &QScreen::orientationChanged, this, &PaintedWindow::orientationChanged);
connect(m_animation, &QAbstractAnimation::finished, this, &PaintedWindow::rotationDone);
connect(this, &PaintedWindow::rotationChanged, this, QOverload<>::of(&PaintedWindow::paint));
}
void PaintedWindow::exposeEvent(QExposeEvent *)
{
if (isExposed())
paint();
}
void PaintedWindow::mousePressEvent(QMouseEvent *)
{
Qt::ScreenOrientation o = contentOrientation();
switch (o) {
case Qt::LandscapeOrientation:
orientationChanged(Qt::PortraitOrientation);
break;
case Qt::PortraitOrientation:
orientationChanged(Qt::InvertedLandscapeOrientation);
break;
case Qt::InvertedLandscapeOrientation:
orientationChanged(Qt::InvertedPortraitOrientation);
break;
case Qt::InvertedPortraitOrientation:
orientationChanged(Qt::LandscapeOrientation);
break;
default:
Q_ASSERT(false);
}
paint();
}
void PaintedWindow::orientationChanged(Qt::ScreenOrientation newOrientation)
{
if (contentOrientation() == newOrientation)
return;
if (m_animation->state() == QAbstractAnimation::Running) {
m_nextTargetOrientation = newOrientation;
return;
}
QRect rect(0, 0, width(), height());
m_prevImage = QImage(width(), height(), QImage::Format_ARGB32_Premultiplied);
m_nextImage = QImage(width(), height(), QImage::Format_ARGB32_Premultiplied);
m_prevImage.fill(0);
m_nextImage.fill(0);
QPainter p;
p.begin(&m_prevImage);
p.setTransform(screen()->transformBetween(contentOrientation(), screen()->orientation(), rect));
paint(&p, screen()->mapBetween(contentOrientation(), screen()->orientation(), rect));
p.end();
p.begin(&m_nextImage);
p.setTransform(screen()->transformBetween(newOrientation, screen()->orientation(), rect));
paint(&p, screen()->mapBetween(newOrientation, screen()->orientation(), rect));
p.end();
m_deltaRotation = screen()->angleBetween(newOrientation, contentOrientation());
if (m_deltaRotation > 180)
m_deltaRotation = 180 - m_deltaRotation;
m_targetOrientation = newOrientation;
m_animation->start();
}
void PaintedWindow::rotationDone()
{
reportContentOrientationChange(m_targetOrientation);
if (m_nextTargetOrientation != Qt::PrimaryOrientation) {
Q_ASSERT(m_animation->state() != QAbstractAnimation::Running);
orientationChanged(m_nextTargetOrientation);
m_nextTargetOrientation = Qt::PrimaryOrientation;
}
}
void PaintedWindow::setRotation(qreal r)
{
if (r != m_rotation) {
m_rotation = r;
emit rotationChanged(r);
}
}
void PaintedWindow::paint()
{
m_context->makeCurrent(this);
QRect rect(0, 0, width() * devicePixelRatio(), height() * devicePixelRatio());
QOpenGLPaintDevice device(size() * devicePixelRatio());
QPainter painter(&device);
QPainterPath path;
path.addEllipse(rect);
painter.setCompositionMode(QPainter::CompositionMode_Source);
painter.fillRect(rect, Qt::transparent);
painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
painter.fillPath(path, Qt::blue);
if (contentOrientation() != m_targetOrientation) {
painter.setRenderHint(QPainter::SmoothPixmapTransform);
painter.save();
painter.translate(width() / 2, height() / 2);
painter.rotate(m_deltaRotation * m_rotation);
painter.translate(-width() / 2, -height() / 2);
painter.drawImage(0, 0, m_prevImage);
painter.restore();
painter.translate(width() / 2, height() / 2);
painter.rotate(m_deltaRotation * m_rotation - m_deltaRotation);
painter.translate(-width() / 2, -height() / 2);
painter.setOpacity(m_rotation);
painter.drawImage(0, 0, m_nextImage);
} else {
QRect mapped = screen()->mapBetween(contentOrientation(), screen()->orientation(), rect);
painter.setTransform(screen()->transformBetween(contentOrientation(), screen()->orientation(), rect));
paint(&painter, mapped);
painter.end();
}
m_context->swapBuffers(this);
}
void PaintedWindow::paint(QPainter *painter, const QRect &rect)
{
painter->setRenderHint(QPainter::Antialiasing);
QFont font;
font.setPixelSize(64);
painter->setFont(font);
painter->drawText(rect, Qt::AlignCenter, "Hello");
}