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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

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
Do somebody tell me a best nano engineering book for beginners?
s. Reply
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?
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.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
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I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
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
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
how did you get the value of 2000N.What calculations are needed to arrive at it
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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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