Alien Invasion Written in C++

In this repo you will find a simple version of the Alien Invasion game written in C++ with the SDL Library.

How to play

Move using your left and right arrow keys. Shoot with space bar. Quit game by pressing the "q" key in your keyboard.

Project Structure

├── build                   # Compiled files
├── src                     # Source files
    ├── images/             # PNG Images of Assets
    ├── Alien               # Controls Alien movement
    ├── AlienInvasion       # Game File. All the logic is located here
    ├── Bullet              # Controls Bullet movement and updates
    ├── Controller          # Handles User Input
    ├── main                # Main file. Calls AlienInvasion::run()
    ├── Renderer            # Initializes the SDL Library
    ├── Settings            # Class with all game settings
    ├── Ship                # Controls Ship movement and updates
    ├── Sprite              # Parent Class to all figures. Defines basic rendering behaviour
└── README.md

Build from source and running

Running on linux please install vcpkg If you are using Ubuntu you can just run the ./configure.sh script which will install vcpkg to manage package dependencies as well as install the sdl2 and sdl2-image libraries

Installing vcpkg from the Microsoft repository

This installs and configures vcpkg inside of the home directory of the current user and exports the path.

$ VCPKGROOT="/home/$(whoami)/vcpkg"
$ export VCPKGROOT
$ export PATH="$PATH:$VCPKGROOT"
$ git clone https://github.com/microsoft/vcpkg $VCPKGROOT
$ $VCPKGROOT/bootstrap-vcpkg.s
$ vcpkg integrate install

Installing the needed libraries

Install SDL2 and SDL2-image to be able to compile the programm

$ vcpkg install sdl2 sdl2-image

Build Project

Clears the build directory if it exists, creates it and calls the cmake command with the needed flag -DCMAKE_TOOLCHAIN_FILE. It then compiles all files for the project

rm -rf build/
mkdir build
cd build
cmake .. -DCMAKE_TOOLCHAIN_FILE=${VCPKGROOT}/scripts/buildsystems/vcpkg.cmake
make

Configuring and building the project

This script runs all the steps above in one go.

./configure.sh

Running the game

Just calls the excecutable inside the build directory

./run.sh

Criteria For Udacity Project

OOP

• Project users OOP techniques ✔️
• Classes use appropriate access specifiers for class members ✔️
• Class constructors utilize member initialization lists ✔️
• Classes abstract implementation details from their interfaces. ✔️
• Classes follow an appropriate inheritance hierarchy ✔️
• Derived class functions override virtual base class functions ✔️
• The project makes use of references in function declarations ✔️
• The project uses smart pointers instead of raw pointers. ✔️
• The project uses multithreading. (Just for fun in AllienInvasion starting on line 51.) ✔️