Book Image

SDL Game Development

By : Shaun Mitchell
5 (1)
Book Image

SDL Game Development

5 (1)
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.
Table of Contents (16 chapters)
SDL Game Development
About the Author
About the Reviewers

Scrolling a tile map

What we have created so far is fine for a game that takes place in one area that is the size of our window, but what about if we want to have large maps that are open to exploration. This is where scrolling comes into play. We have actually implemented this already but have not yet gone through it step-by-step or seen it in action. Let's do this now.

First of all, we must resize our map in the Tiled application. Navigating to Map | Resize Map… will allow us to do this. Leave the height of our map at 15 and change the width to 60. Fill up the remaining squares with whatever tiles you like. The map would then look like the following screenshot:

Save the map and we can look at the code:

int x, y, x2, y2 = 0;

x = m_position.getX() / m_tileSize;
y = m_position.getY() / m_tileSize;

x2 = int(m_position.getX()) % m_tileSize;
y2 = int(m_position.getY()) % m_tileSize;

When scrolling the map we don't actually move it more than a tile width; we use the position value to work out where...