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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

how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
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s. Reply
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s. Reply
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s. Reply
of graphene you mean?
or in general
in general
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preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
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silver nanoparticles could handle the job?
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I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
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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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