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Learn how to use the Sprite01 class developed in an earlier module to write a predator/prey simulation program involving thousands of sprites, collision detection, and sound effects.

Table of contents


This module is one in a collection of modules designed to teach you about the anatomy of a game engine.

Although the modules in this collection will concentrate on the Java game library named Slick2D, theconcepts involved and the knowledge that you will gain is applicable to different game engines written in different programming languages as well.

The purpose of this module is to teach you how to use the Sprite01 class developed in an earlier module titled Slick0200: Developing a sprite class to write a predator/prey simulation program involving thousands of sprites along with collision detection and sound effects.

Viewing tip

I recommend that you open another copy of this module in a separate browser window and use the following links to easily find and view the imagesand listings while you are reading about them.


  • Figure 1 . Graphic output near the beginning of the simulation.
  • Figure 2 . Graphic output near the middle of the simulation.
  • Figure 3 . Graphic output near the end of the simulation.
  • Figure 4 . Output for the harmless blue sprite scenario.


  • Listing 1 . Beginning of the class named Slick0210.
  • Listing 2 . Beginning of the init method.
  • Listing 3 . Add a red sprite to the ArrayList object.
  • Listing 4 . Populate the ArrayList object.
  • Listing 5 . Beginning of the update method.
  • Listing 6 . Test for a collision.
  • Listing 7 . The isCollision method of the Sprite01 class.
  • Listing 8 . Process a collision
  • Listing 9 . Remove dead objects from the ArrayList object.
  • Listing 10 . The render method.
  • Listing 11 . Source code for the program named Slick0210.
  • Listing 12 . Source code for the class named Sprite01.


In an earlier module titled Slick0200: Developing a sprite class , we encountered a baseball coach that had been attacked by a swarm of viciousladybug sprites. I promised you that we would later find a way to save the coach. That time has come.

In this module, I will explain a program that uses the Sprite01 class from the earlier module to produce a simulation program with the outputshown in Figure 1 , Figure 2 , and Figure 3 .

A swarm of insects

Once again, the coach has been attacked by a swarm of 1000 insects. However, in this case, the ladybug sprites have been replaced by vicious green beetlesprites.

A red predator beetle

Fortunately for the coach, a red predator beetle sprite with a taste for green beetles has come along and is gobbling up green beetles as fast as he cancollide with them. (According to the text at the top of Figure 1 , 152 of the 1000 beetles had been consumed by the time the screen shot in Figure 1 was taken.)

Questions & Answers

anyone know any internet site where one can find nanotechnology papers?
Damian Reply
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
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Akash Reply
it is a goid question and i want to know the answer as well
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for teaching engĺish at school how nano technology help us
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
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
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
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
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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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