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A screen shot of the output from the program while the large spider is in its blue state is shown in Figure 3 .

Figure 3 . Another output from the program named Slick0160b.
Missing image.

What you have learned

In the previous module, you learned how to make sprites move at a constant speed in front of an image in the face of widely varying frame rates. You alsolearned about a rudimentary form of collision detection.

What you will learn

In this module, you will learn about using the draw , drawCentered , and drawFlash methods of the Image class.

General background information

The Slick2D Image class defines about ten overloaded versions of the draw method. We will investigate several of them in this module.

The class also defines three overloaded versions of the drawFlash method along with a method named drawCentered . We will also investigate some of them.

Discussion and sample code

The program named Slick0160a

Beginning of the Slick0160a class

Will discuss in fragments

A complete listing of this program is provided in Listing 13 . As is my custom, I will break this program down and discuss it in fragments.

Listing 1 shows the beginning of the class down through the constructor.

Listing 1 . Beginning of the Slick0160a class.
import org.newdawn.slick.AppGameContainer; import org.newdawn.slick.BasicGame;import org.newdawn.slick.GameContainer; import org.newdawn.slick.Graphics;import org.newdawn.slick.Image; import org.newdawn.slick.SlickException;import org.newdawn.slick.Color; public class Slick0160a extends BasicGame{Image rabbit = null;float rabbitWidth;float rabbitHeight; //Frame rate we would like to see and maximum frame // rate we will allow.int targetFPS = 60; //----------------------------------------------------//public Slick0160a(){//constructor //Set the titlesuper("Slick0160a, baldwin"); }//end constructor//----------------------------------------------------//

As usual, it is necessary to declare several import directives that point to classes in the Slick2D library. Also, as in several previous modules, thenew class extends the Slick2D class named BasicGame .

Listing 1 declares several instance variables, initializing some of them.

The constructor simply sets the title on the game window.

The main method

The main method is shown in Listing 2 . There is nothing in Listing 2 that you haven't seen in several previous modules.

Listing 2 . The main method.
public static void main(String[] args)throws SlickException{ AppGameContainer app = new AppGameContainer(new Slick0160a(),512,537,false); app.start();}//end main

The init method

The init method is shown in Listing 3 .

There is nothing in Listing 3 that you haven't seen in previous modules.

Listing 3 . The init method.
@Override public void init(GameContainer gc)throws SlickException { rabbit = new Image("rabbit.png");rabbitWidth = rabbit.getWidth(); rabbitHeight = rabbit.getHeight();System.out.println("rabbitWidth: " + rabbitWidth); System.out.println("rabbitHeight: " + rabbitHeight); gc.setShowFPS(false) ;gc.setTargetFrameRate(targetFPS);//set frame rate }//end init

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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