80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
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// Copyright (C) 2022 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
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#include "mainwindow.h"
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#include "./ui_mainwindow.h"
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#include <QPushButton>
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#include <QSlider>
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#include <QLabel>
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#include <QGraphicsEllipseItem>
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#include <QRandomGenerator>
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#include <QOpenGLWidget>
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MainWindow::MainWindow(QWidget *parent)
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: QMainWindow(parent)
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, ui(new Ui::MainWindow)
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{
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ui->setupUi(this);
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ui->graphicsView->setViewport(new QOpenGLWidget);
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ui->graphicsView->setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
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QRect rect = ui->graphicsView->rect();
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QGraphicsScene *m_scene = new QGraphicsScene(rect);
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ui->graphicsView->setScene(m_scene);
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QSize initialSize(150, 150);
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m_ellipse = m_scene->addEllipse(
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rect.width() / 2 - initialSize.width() / 2,
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rect.height() / 2 - initialSize.height() / 2,
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initialSize.width(),
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initialSize.height(),
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QPen(Qt::magenta, 5),
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Qt::blue);
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QPushButton *button = new QPushButton();
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button->setGeometry(QRect(rect.width() / 2 - 75, 100, 150, 50));
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button->setText("Random ellipse color");
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QObject::connect(button, &QPushButton::pressed, [&]() {
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m_ellipse->setBrush(QColor::fromRgb(QRandomGenerator::global()->generate()));
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m_ellipse->setPen(QPen(QColor::fromRgb(QRandomGenerator::global()->generate()), 5));
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});
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m_scene->addWidget(button);
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m_label = new QLabel();
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m_label->setGeometry(QRect(rect.width() / 2 - 50, rect.height() - 100, 100, 50));
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m_label->setAlignment(Qt::AlignCenter);
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m_scene->addWidget(m_label);
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QSlider *slider = new QSlider(Qt::Horizontal);
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slider->setGeometry(QRect(rect.width() / 2 - 100, rect.height() - 50, 200, 50));
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slider->setMinimum(10);
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slider->setMaximum(300);
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slider->setValue(initialSize.width());
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QObject::connect(slider, &QAbstractSlider::valueChanged, [this](int value){
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QRectF rect = m_ellipse->rect();
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rect.setWidth(value);
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rect.setHeight(value);
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m_ellipse->setRect(rect);
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m_label->setText("Ellipse size: " + QString::number(value));
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});
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emit slider->valueChanged(initialSize.width());
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m_scene->addWidget(slider);
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QMenu *screenShotMenu = menuBar()->addMenu("&Screenshot");
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screenShotMenu->addAction("Left buffer", this, [this](){
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ui->graphicsView->saveImage(QOpenGLWidget::LeftBuffer);
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});
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screenShotMenu->addAction("Right buffer", this, [this](){
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ui->graphicsView->saveImage(QOpenGLWidget::RightBuffer);
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});
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}
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MainWindow::~MainWindow()
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{
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delete ui;
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}
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