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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "mainwindow.h"
#include "./ui_mainwindow.h"
#include <QPushButton>
#include <QSlider>
#include <QLabel>
#include <QGraphicsEllipseItem>
#include <QRandomGenerator>
#include <QOpenGLWidget>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
ui->graphicsView->setViewport(new QOpenGLWidget);
ui->graphicsView->setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
QRect rect = ui->graphicsView->rect();
QGraphicsScene *m_scene = new QGraphicsScene(rect);
ui->graphicsView->setScene(m_scene);
QSize initialSize(150, 150);
m_ellipse = m_scene->addEllipse(
rect.width() / 2 - initialSize.width() / 2,
rect.height() / 2 - initialSize.height() / 2,
initialSize.width(),
initialSize.height(),
QPen(Qt::magenta, 5),
Qt::blue);
QPushButton *button = new QPushButton();
button->setGeometry(QRect(rect.width() / 2 - 75, 100, 150, 50));
button->setText("Random ellipse color");
QObject::connect(button, &QPushButton::pressed, [&]() {
m_ellipse->setBrush(QColor::fromRgb(QRandomGenerator::global()->generate()));
m_ellipse->setPen(QPen(QColor::fromRgb(QRandomGenerator::global()->generate()), 5));
});
m_scene->addWidget(button);
m_label = new QLabel();
m_label->setGeometry(QRect(rect.width() / 2 - 50, rect.height() - 100, 100, 50));
m_label->setAlignment(Qt::AlignCenter);
m_scene->addWidget(m_label);
QSlider *slider = new QSlider(Qt::Horizontal);
slider->setGeometry(QRect(rect.width() / 2 - 100, rect.height() - 50, 200, 50));
slider->setMinimum(10);
slider->setMaximum(300);
slider->setValue(initialSize.width());
QObject::connect(slider, &QAbstractSlider::valueChanged, [this](int value){
QRectF rect = m_ellipse->rect();
rect.setWidth(value);
rect.setHeight(value);
m_ellipse->setRect(rect);
m_label->setText("Ellipse size: " + QString::number(value));
});
emit slider->valueChanged(initialSize.width());
m_scene->addWidget(slider);
QMenu *screenShotMenu = menuBar()->addMenu("&Screenshot");
screenShotMenu->addAction("Left buffer", this, [this](){
ui->graphicsView->saveImage(QOpenGLWidget::LeftBuffer);
});
screenShotMenu->addAction("Right buffer", this, [this](){
ui->graphicsView->saveImage(QOpenGLWidget::RightBuffer);
});
}
MainWindow::~MainWindow()
{
delete ui;
}
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