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Merge pull request #11 from XuhuaHuang/develop
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‎Array/CMakeLists.txt‎

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cmake_minimum_required(VERSION 3.20)
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project(Array LANGUAGES C)
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set(CMAKE_C_STANDARD 11)
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set(CMAKE_C_STANDARD_REQUIRED ON)
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# Adding multiple executable to the project
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# Right-click on each item to set as start-up project
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add_executable(ArrayCStyle "array.c")
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add_executable(MatrixCStyle "matrix.c")

‎Array/array.c‎

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/*****************************************************************//**
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* \file array.c
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* \brief gcc -c array.c -o array.exe -Wall
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*
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* \author Xuhua Huang
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* \date November 2022
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*********************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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void displayArray(int arr[], const int size) {
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for (int i = 0; i < size; i++) {
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printf("%d, ", arr[i]);
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}
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printf("\n");
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return;
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}
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// the displayArray function defined above
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// is the same as the one defined below
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// int arr[] will decade to int* arr
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// void displayArray(int* arr, const int size) {
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// for (int i = 0; i < size; i++) {
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// printf("%d, ", *(arr+i));
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// }
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// printf("\n");
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// return;
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// }
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int main(void) {
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int vector[5] = { 1, 2, 3, 4, 5 };
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displayArray(vector, 5);
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printf("With dynamic array size determination:\n");
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displayArray(vector, sizeof(vector)/sizeof(vector[0]));
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system("pause");
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return EXIT_SUCCESS;
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}

‎Array/matrix.c‎

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/*****************************************************************//**
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* \file matrix.c
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* \brief
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*
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* \author Xuhua Huang
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* \date November 2022
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*********************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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int main(void) {
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int matrix[2][5] = {
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{1, 2, 3, 4, 5},
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{6, 7, 8, 9, 10}
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};
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for (int row = 0; row < 2; row++) {
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for (int col = 0; col < 5; col++) {
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printf("matrix[%d][%d] Address: %p Value: %d\n",
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row, col,
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&matrix[row][col],
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matrix[row][col]);
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}
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}
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return EXIT_SUCCESS;
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}

‎Inheritance/CMakeLists.txt‎

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cmake_minimum_required(VERSION 3.20)
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project(Inheritance)
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set(CMAKE_CXX_STANDARD 11)
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set(CMAKE_CXX_STANDARD_REQUIRED ON)
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# Adding multiple executable to the project
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# Right-click on each item to set as start-up project
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add_executable(InheritanceNotes "Inheritance_notes.cpp")
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add_subdirectory(BankingAccounts)
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add_subdirectory(Relatives)

‎Qt/ImageViewer/ImageViewer.pro‎

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######################################################################
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# Automatically generated by qmake (3.1) Sun Nov 27 14:40:35 2022
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######################################################################
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TEMPLATE = app
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TARGET = ImageViewer
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QT += core gui network
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greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
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INCLUDEPATH += .
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# The following define makes your compiler warn you if you use any
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# feature of Qt which has been marked as deprecated (the exact warnings
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# depend on your compiler). Please consult the documentation of the
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# deprecated API in order to know how to port your code away from it.
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DEFINES += QT_DEPRECATED_WARNINGS
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# You can also make your code fail to compile if you use deprecated APIs.
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# In order to do so, uncomment the following line.
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# You can also select to disable deprecated APIs only up to a certain version of Qt.
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#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
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# Input
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HEADERS += mainwindow.h
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SOURCES += main.cpp mainwindow.cpp

‎Qt/ImageViewer/main.cpp‎

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/*****************************************************************//**
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* \file main.cpp
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* \brief Use command `qmake -project` to generate the Qt project file
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* The following lines are required in the ImageViewer.pro file:
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* QT += core gui network
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* greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
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*
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* \author Xuhua Huang
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* \date November 27, 2022
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*********************************************************************/
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#include <QApplication>
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#include <QMainWindow>
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#include "mainwindow.h"
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int main(int argc, char** argv) {
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QApplication app(argc, argv);
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MainWindow window;
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window.setWindowTitle("Image Viewer");
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window.show();
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return app.exec();
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}

‎Qt/ImageViewer/mainwindow.cpp‎

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/*****************************************************************//**
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* \file mainwindow.cpp
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* \brief
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*
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* \author Xuhua Huang
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* \date November 2022
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*********************************************************************/
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#include <QApplication>
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#include <QFileDialog>
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#include <QMessageBox>
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#include <QPixmap>
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#include <QKeyEvent>
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#include <QDebug>
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#include "mainwindow.h"
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MainWindow::MainWindow(QWidget* parent) :
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QMainWindow(parent)
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, fileMenu(nullptr)
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, viewMenu(nullptr)
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, currentImage(nullptr)
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{
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initUI();
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}
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MainWindow::~MainWindow()
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{
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}
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void MainWindow::initUI()
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{
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this->resize(800, 600);
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// setup menubar
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fileMenu = menuBar()->addMenu("&File");
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viewMenu = menuBar()->addMenu("&View");
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// setup toolbar
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fileToolBar = addToolBar("File");
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viewToolBar = addToolBar("View");
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// main area for image display
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imageScene = new QGraphicsScene(this);
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imageView = new QGraphicsView(imageScene);
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setCentralWidget(imageView);
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// setup status bar
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mainStatusBar = statusBar();
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mainStatusLabel = new QLabel(mainStatusBar);
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mainStatusBar->addPermanentWidget(mainStatusLabel);
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mainStatusLabel->setText("Image Information will be here!");
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createActions();
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}
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void MainWindow::createActions()
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{
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// create actions, add them to menus
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openAction = new QAction("&Open", this);
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fileMenu->addAction(openAction);
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saveAsAction = new QAction("&Save as", this);
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fileMenu->addAction(saveAsAction);
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exitAction = new QAction("E&xit", this);
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fileMenu->addAction(exitAction);
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zoomInAction = new QAction("Zoom in", this);
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viewMenu->addAction(zoomInAction);
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zoomOutAction = new QAction("Zoom Out", this);
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viewMenu->addAction(zoomOutAction);
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prevAction = new QAction("&Previous Image", this);
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viewMenu->addAction(prevAction);
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nextAction = new QAction("&Next Image", this);
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viewMenu->addAction(nextAction);
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// add actions to toolbars
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fileToolBar->addAction(openAction);
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viewToolBar->addAction(zoomInAction);
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viewToolBar->addAction(zoomOutAction);
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viewToolBar->addAction(prevAction);
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viewToolBar->addAction(nextAction);
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// connect signals and slots
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connect(exitAction, SIGNAL(triggered(bool)), QApplication::instance(), SLOT(quit()));
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connect(openAction, SIGNAL(triggered(bool)), this, SLOT(openImage()));
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connect(saveAsAction, SIGNAL(triggered(bool)), this, SLOT(saveAs()));
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connect(zoomInAction, SIGNAL(triggered(bool)), this, SLOT(zoomIn()));
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connect(zoomOutAction, SIGNAL(triggered(bool)), this, SLOT(zoomOut()));
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connect(prevAction, SIGNAL(triggered(bool)), this, SLOT(prevImage()));
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connect(nextAction, SIGNAL(triggered(bool)), this, SLOT(nextImage()));
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setupShortcuts();
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}
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void MainWindow::openImage()
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{
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QFileDialog dialog(this);
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dialog.setWindowTitle("Open Image");
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dialog.setFileMode(QFileDialog::ExistingFile);
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dialog.setNameFilter(tr("Images (*.png *.bmp *.jpg)"));
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QStringList filePaths;
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if (dialog.exec()) {
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filePaths = dialog.selectedFiles();
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showImage(filePaths.at(0));
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}
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}
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void MainWindow::showImage(QString path)
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{
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imageScene->clear();
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imageView->resetMatrix();
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QPixmap image(path);
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currentImage = imageScene->addPixmap(image);
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imageScene->update();
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imageView->setSceneRect(image.rect());
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QString status = QString("%1, %2x%3, %4 Bytes").arg(path).arg(image.width())
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.arg(image.height()).arg(QFile(path).size());
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mainStatusLabel->setText(status);
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currentImagePath = path;
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}
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void MainWindow::zoomIn()
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{
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imageView->scale(1.2, 1.2);
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}
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void MainWindow::zoomOut()
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{
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imageView->scale(1 / 1.2, 1 / 1.2);
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}
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void MainWindow::prevImage()
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{
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QFileInfo current(currentImagePath);
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QDir dir = current.absoluteDir();
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QStringList nameFilters;
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nameFilters << "*.png" << "*.bmp" << "*.jpg";
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QStringList fileNames = dir.entryList(nameFilters, QDir::Files, QDir::Name);
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int idx = fileNames.indexOf(QRegExp(QRegExp::escape(current.fileName())));
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if (idx > 0) {
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showImage(dir.absoluteFilePath(fileNames.at(idx - 1)));
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}
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else {
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QMessageBox::information(this, "Information", "Current image is the first one.");
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}
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}
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void MainWindow::nextImage()
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{
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QFileInfo current(currentImagePath);
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QDir dir = current.absoluteDir();
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QStringList nameFilters;
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nameFilters << "*.png" << "*.bmp" << "*.jpg";
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QStringList fileNames = dir.entryList(nameFilters, QDir::Files, QDir::Name);
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int idx = fileNames.indexOf(QRegExp(QRegExp::escape(current.fileName())));
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if (idx < fileNames.size() - 1) {
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showImage(dir.absoluteFilePath(fileNames.at(idx + 1)));
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}
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else {
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QMessageBox::information(this, "Information", "Current image is the last one.");
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}
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}
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void MainWindow::saveAs()
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{
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if (currentImage == nullptr) {
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QMessageBox::information(this, "Information", "Nothing to save.");
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return;
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}
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QFileDialog dialog(this);
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dialog.setWindowTitle("Save Image As ...");
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dialog.setFileMode(QFileDialog::AnyFile);
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dialog.setAcceptMode(QFileDialog::AcceptSave);
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dialog.setNameFilter(tr("Images (*.png *.bmp *.jpg)"));
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QStringList fileNames;
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if (dialog.exec()) {
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fileNames = dialog.selectedFiles();
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if (QRegExp(".+\\.(png|bmp|jpg)").exactMatch(fileNames.at(0))) {
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currentImage->pixmap().save(fileNames.at(0));
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}
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else {
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QMessageBox::information(this, "Information", "Save error: bad format or filename.");
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}
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}
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}
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void MainWindow::setupShortcuts()
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{
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QList<QKeySequence> shortcuts;
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shortcuts << Qt::Key_Plus << Qt::Key_Equal;
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zoomInAction->setShortcuts(shortcuts);
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shortcuts.clear();
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shortcuts << Qt::Key_Minus << Qt::Key_Underscore;
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zoomOutAction->setShortcuts(shortcuts);
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shortcuts.clear();
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shortcuts << Qt::Key_Up << Qt::Key_Left;
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prevAction->setShortcuts(shortcuts);
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shortcuts.clear();
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shortcuts << Qt::Key_Down << Qt::Key_Right;
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nextAction->setShortcuts(shortcuts);
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}

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