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What you have learned

In the previous module, you learned how to use the following methods of the Input class to get user input:

  • isKeyDown
  • isMouseButtonDown
  • getMouseX
  • getMouseY

What you will learn

In this module, you will learn how to use objects of the SpriteSheet class and the Animation class to perform simple sprite sheet animation. In the next module, you will learn how to performmore complex animation.

General background information

The SpriteSheet class

Sprite sheets are individual sprites (or images) combined into a single image as shown in Figure 1 . Slick2D provides the SpriteSheet class that makes it relatively easy for you to access each of the sub-images of the sheet as separate imagesin your program.

The SpriteSheet class assumes that all the images are evenly spaced. It splits the source image into an even grid of cells and allows you to access the image in each cell as a separate image.

(Slick2D also provides the capability to work with packed sprite sheets with fewer restrictions on the organization of the sprite sheet.)

The Animation class

A series of images

Since well before the first Disney movies, animations have been created by displaying a series of images one after theother.

Each image (or frame) is typically displayed for the same amount of time, but that is not always the case, as will be demonstrated by the program in thenext module.

Slick2D provides a class named Animation that does most of the heavy lifting in the display of an animation.

Create, populate, and configure the object

There are several different ways to create, populate, and configure an Animation object containing a series of images, with the same or different display durations for the images.

Displaying the images

By default, calling one of several overloaded draw methods on the Animation object causes it to display the sequence of images and to start over when the last image has been displayed. However, that behaviorcan be overridden in order to provide more customized behavior.

(It is actually more complicated that that, as you will see later in the discussion of the render method.)

Animations can be stopped, started and restarted (returning to the first frame of the animation) . The capabilities of the Animation class go far beyond those illustrated in this module and the next.

Discussion and sample code

The class named Slick0180

Will discuss in fragments

A complete listing of the program named Slick0180 is provided in Listing 8 . I will break the program down and discuss it in fragments.

Listing 1 shows the beginning of the class named Slick0180 down through the main method.

Listing 1 . Beginning of the class named Slick0180.
public class Slick0180 extends BasicGame{ Image spriteSheetImage = null;float spriteSheetWidth; float spriteSheetHeight;int spritesPerRow = 5; int spritesPerColumn = 2;int targetDelta = 16;//msec int duration = 200;//time to display each spritelong totalTime = 0;//accumulate total time for display SpriteSheet spriteSheet;Animation animation; int spriteWidth;int spriteHeight; float spriteX = 0;//sprite drawing locationfloat spriteY = 0; //----------------------------------------------------//public Slick0180(){ //Call to superclass constructor is required.super("Slick0180, Baldwin."); }//end constructor//----------------------------------------------------// public static void main(String[]args) throws SlickException{AppGameContainer app = new AppGameContainer( new Slick0180(),450,120,false);app.start();//this statement is required }//end main

Questions & Answers

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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
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.
Bharti
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
Daniel
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
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
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
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
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.
Tarell
what is the actual application of fullerenes nowadays?
Damian
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.
Tarell
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.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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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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