Working with Game Objects | SDL Game Development

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SDL Game Development

By : Shaun Mitchell

2.9 (37)

SDL Game Development

2.9 (37)

By: Shaun Mitchell

Overview of this book

SDL 2.0 is the latest release of the popular Simple DirectMedia Layer API, which is designed to make life easier for C++ developers, allowing you simple low-level access to various multiplatform audio, graphics, and input devices.SDL Game Development guides you through creating your first 2D game using SDL and C++. It takes a clear and practical approach to SDL game development, ensuring that the focus remains on creating awesome games.Starting with the installation and setup of SDL, you will quickly become familiar with useful SDL features, covering sprites, state management, and OOP, leading to a reusable framework that is extendable for your own games. SDL Game Development culminates in the development of two exciting action games that utilize the created framework along with tips to improve the framework.

SDL Game Development

SDL Game Development

Credits

Credits

About the Author

About the Author

About the Reviewers

About the Reviewers

www.PacktPub.com

www.PacktPub.com

Preface

Preface

Free Chapter

Getting Started with SDL

Getting Started with SDL

Why use SDL?

Setting up SDL in Visual C++ Express 2010

Hello SDL

What makes up a game

The Game class

Summary

Drawing in SDL

Drawing in SDL

Basic SDL drawing

Source and destination rectangles

Installing SDL_image

Tying it into the framework

Summary

Working with Game Objects

Working with Game Objects

Using inheritance

Implementing polymorphism

Using abstract base classes

Should we always use inheritance?

Putting it all together

Summary

Exploring Movement and Input Handling

Exploring Movement and Input Handling

Setting up game objects for movement

Creating fixed frames per second

Input handling

Summary

Handling Game States

Handling Game States

A simple way for switching states

Implementing finite state machines

Implementing menu states

Summary

Data-driven Design

Data-driven Design

Loading XML files

Implementing Object Factories

Fitting the factory into the framework

Parsing states from an XML file

Loading the menu state from an XML file

Loading other states from an XML file

Summary

Creating and Displaying Tile Maps

Creating and Displaying Tile Maps

What is a tile map?

Getting familiar with the Tiled application

Parsing and drawing a tile map

Scrolling a tile map

Parsing object layers

Summary

Creating Alien Attack

Creating Alien Attack

Using the SDL_mixer extension for sound

Setting up the basic game objects

Handling bullets

Dealing with collisions

Possible improvements

Summary

Creating Conan the Caveman

Creating Conan the Caveman

Setting up the basic game objects

Possible additions

Summary

Index

Index

Implementing polymorphism

This leads us to our next OOP feature, polymorphism. What polymorphism allows us to do is to refer to an object through a pointer to its parent or base class. This may not seem powerful at first, but what this will allow us to do is essentially have our Game class need only to store a list of pointers to one type and any derived types can also be added to this list.

Let us take our GameObject and Player classes as examples, with an added derived class, Enemy. In our Game class we have an array of GameObject*:

std::vector<GameObject*> m_gameObjects;

We then declare four new objects, all of which are GameObject*:

GameObject* m_player;
GameObject* m_enemy1;
GameObject* m_enemy2;
GameObject* m_enemy3;

In our Game::init function we can then create instances of the objects using their individual types:

m_player = new Player();
m_enemy1 = new Enemy();
m_enemy2 = new Enemy();
m_enemy3 = new Enemy();

Now they can be pushed into the array of GameObject*:

m_gameObjects.push_back...

CONTINUE READING

83

Tech Concepts

36

Programming languages

73

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