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#include "mainwindow.h"

#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)

    : QMainWindow(parent)

    , ui(new Ui::MainWindow)

{

    ui->setupUi(this);

    this->setGeometry(0,0, 640, 530);

    // create a label to display an image

    dispLbl = new QLabel("display", this);

    dispLbl->setGeometry(QRect(QPoint(0, 0), QSize(640, 480)));

    // create a pushbutton to load an image

    loadBtn = new QPushButton("Load", this);

    loadBtn->setGeometry(QRect(QPoint(0, 480), QSize(640, 50)));

    // connect pushbutton signal

    connect(loadBtn, SIGNAL(clicked()), this, SLOT(slotLoadImage()));

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::slotLoadImage()

{

    QString filename = QFileDialog::getOpenFileName(

                this,

                "Open file",

                QString("c:/OpenCV/images/"),

                "All files (*.*)"

                );

    this->path = filename;

    this->loadBtn->setText(filename);

}

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include <QtWidgets/QPushButton>

#include <QtWidgets/QLabel>

#include <QString>

#include <QFileDialog>

#include <opencv2/opencv.hpp>

QT_BEGIN_NAMESPACE

namespace Ui { class MainWindow; }

QT_END_NAMESPACE

class MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    MainWindow(QWidget *parent = nullptr);

    ~MainWindow();

private slots:

    void slotLoadImage();

private:

    Ui::MainWindow *ui;

    QPushButton *loadBtn;

    QLabel *dispLbl;

    QString path;

    void loadImage();

};

#endif // MAINWINDOW_H

#include "mainwindow.h"

#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)

    : QMainWindow(parent)

    , ui(new Ui::MainWindow)

{

    ui->setupUi(this);

    this->setGeometry(0,0, 640, 530);

    // create a label to display an image

    dispLbl = new QLabel("display", this);

    dispLbl->setGeometry(QRect(QPoint(0, 0), QSize(640, 480)));

    // create a pushbutton to load an image

    loadBtn = new QPushButton("Load", this);

    loadBtn->setGeometry(QRect(QPoint(0, 480), QSize(640, 50)));

    // connect pushbutton signal

    connect(loadBtn, SIGNAL(clicked()), this, SLOT(slotLoadImage()));

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::slotLoadImage()

{

    QString filename = QFileDialog::getOpenFileName(

                this,

                "Open file",

                QString("c:/OpenCV/images/"),

                "All files (*.*)"

                );

    this->path = filename;

    this->loadBtn->setText(filename);

    this->loadImage();

}

void MainWindow::loadImage()

{

        cv::Mat img = cv::imread(path.toStdString(), cv::IMREAD_COLOR);

        auto w = this->dispLbl->width();

        auto h = this->dispLbl->height();

        this->dispLbl->setPixmap(

               QPixmap::fromImage(

                  QImage(img.data, img.cols, img.rows, img.step, QImage::Format_BGR888).scaled(w, h, Qt::KeepAspectRatio)

               )

        );

}