Book Image

SFML Game Development

By : Artur Moreira, Henrik Vogelius Hansson, Jan Haller, Henrik Valter Vogelius, SFML
Book Image

SFML Game Development

By: Artur Moreira, Henrik Vogelius Hansson, Jan Haller, Henrik Valter Vogelius, SFML

Overview of this book

Game development comprises the combination of many different aspects such as game logics, graphics, audio, user input, physics and much more. SFML is an Open Source C++ library designed to make game development more accessible, exposing multimedia components to the user through a simple, yet powerful interface. If you are a C++ programmer with a stack of ideas in your head and seeking a platform for implementation, your search ends here.Starting with nothing more than a blank screen, SFML Game Development will provide you with all the guidance you need to create your first fully featured 2D game using SFML 2.0. By the end, you'll have learned the basic principles of game development, including advanced topics such as how to network your game, how to utilize particle systems and much more.SFML Game Development starts with an overview of windows, graphics, and user inputs. After this brief introduction, you will start to get to grips with SFML by building up a world of different game objects, and implementing more and more gameplay features. Eventually, you'll be handling advanced visual effects, audio effects and network programming like an old pro. New concepts are discussed, while the code steadily develops.SFML Game Development will get you started with animations, particle effects and shaders. As well as these fundamental game aspects, we're also covering network programming to the extent where you'll be able to support the game running from two different machines. The most important part, the gameplay implementation with enemies and missiles, will make up the core of our top-scrolling airplane shoot' em-up game!You will learn everything you need in SFML Game Development in order to start with game development and come closer to creating your own game.
Table of Contents (18 chapters)
SFML Game Development
About the Authors
About the Reviewers

An interacting world

A lot of game logic has been implemented in the different entities, now we look at functionality that is defined in the World class. You have already seen the collision in the last section.

Cleaning everything up

During the game, entities are destroyed in battle, and have to be removed from the scene graph. We do not remove them instantly. Once in a frame, we iterate through the scene graph, check which nodes have been destroyed, and detach them from their parents. To find out whether a node has been destroyed, we write the virtual function SceneNode::isDestroyed(). By default, it returns false. A derived entity may specify a condition under which it returns true. Usually, this will be the case when the hitpoints are zero or less (that is, the entity is destroyed).

bool Entity::isDestroyed() const
    return mHitpoints <= 0;

In addition, we add a virtual function that checks if a scene node should be removed from the scene graph. By default, this is true as soon as...