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You will learn how to write a minimal Java application in conjunction with a set of Slick2D jar files to create your own Slick2D game engine. Using that programas an example, you will learn about the overall structure of the Slick2D game engine.

You will learn that game engines are typically service provider programs and you will learn about a common set of services that is provided bymany game engines.

You will learn about the two cooperating objects that form the heart of the Slick2D game engine.

You will learn about the methods declared in the interface named Game .

What is a game engine?

The term "game engine" is jargon for something that is more properly called a "software framework."

A software framework

Here is part of what Wikipedia has to say about a software framework:

A software framework , in computer programming, is an abstraction in which common code providing generic functionality can be selectively overridden or specialized by user code providing specific functionality .

Frameworks are a special case of software libraries in that they are reusable abstractions of code wrapped in a well-defined API, yet they contain some key distinguishing features that separate them from normal libraries.

Software frameworks have these distinguishing features that separate them from libraries or normal user applications :

  1. inversion of control - In a framework, unlike in libraries or normal user applications, the overall program's flow of control is not dictated by the caller, but by the framework.
  2. default behavior - A framework has a default behavior. This default behavior must actually be some useful behavior and not a series of no-ops.
  3. extensibility - A framework can be extended by the user by selective overriding of framework code in order to provide specific functionality
  4. non-modifiable framework code - The framework code, in general should not normally be modified by the user. Users can extend the framework, butnormally should not modify its code.

In short, a framework is a computer program that helps you to write computer programs.

Not a game engine

Under this definition, Slick2D in its raw form is not a game engine nor is it a framework. Instead, it is a library of Java classes that you can use to create aframework or game engine.

In particular, if you combine the contents of the files named slick.jar and lwjgl.jar with the minimal Java application shown in Listing 1 and described in Figure 1 , you will have created a game engine. That combination is what I will refer to hereafter as the Slick2D game engine .

Having done that, the framework description given above is a good match for the Slick2D game engine.

Background information

Listing 1 shows a very simple Java application program.This is possibly the simplest program that can be written using Slick2D that will run as a Java application.

(A different approach is used to create a Slick2D program that will run as a Java applet, but I probably won't get into Java applets in this collection ofmodules.)

I will use this program to explain the overall structure of the Slick2D game engine in this module. I will explain the inner workings of the game engine in more detail infuture modules.

Questions & Answers

How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
How can I make nanorobot?
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
how can I make nanorobot?
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
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Source:  OpenStax, Anatomy of a game engine. OpenStax CNX. Feb 07, 2013 Download for free at https://legacy.cnx.org/content/col11489/1.13
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