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An object of the Sound class

The only thing new in Listing 2 is the instantiation of the object of type Sound . As you can see, the syntax for instantiation of a Sound object is essentially the same as for instantiating an Image object.

Add a red sprite

Listing 3 calls the add method of the ArrayList class to add a red sprite to the beginning of the ArrayList object. (Actually it add a reference to that object and not the object itself.)

You are already familiar with the constructor parameters (shown in Listing 3 ) for a Sprite01 object.

Listing 3 . Add a red sprite to the ArrayList object.
sprites.add(new Sprite01( redBallImage,//imagebackgroundWidth/2.0f,//initial position backgroundHeight/2.0f,//initial position(random.nextFloat()>0.5) ? 1f : -1f,//direction (random.nextFloat()>0.5) ? 1f : -1f,//direction 0.1f+random.nextFloat()*2.0f,//step size0.1f+random.nextFloat()*2.0f,//step size 0.5f+random.nextFloat()*1.5f,//scalenew Color(1.0f,1.0f,1.0f)));//color filter

Populate the ArrayList object

Listing 4 uses a for loop and the value of the variable named numberSprites (see Listing 1 ) to add 1000 green Sprite01 object references to the ArrayList object.

Listing 4 . Populate the ArrayList object.
for(int cnt = 0;cnt<numberSprites;cnt++){ sprites.add(new Sprite01(greenBallImage,//image backgroundWidth*random.nextFloat(),//positionbackgroundHeight*random.nextFloat(),//position (random.nextFloat()>0.5) ? 1f : -1f,//direction (random.nextFloat()>0.5) ? 1f : -1f,//direction 0.1f+random.nextFloat()*2.0f,//step size0.1f+random.nextFloat()*2.0f,//step size random.nextFloat()*1.0f,//scalenew Color(1.0f,1.0f,1.0f)));//color filter }//end for loopgc.setTargetFrameRate(targetFPS);//set frame rate }//end init

Listing 4 also sets the target frame rate and signals the end of the init method.

The update method

The overall behavior of the update method is to use a for loop to process the red sprite against each of the green sprites and to take appropriate actions when a collision between the red sprite and agreen sprite occurs.

The update method begins in Listing 5 .

Listing 5 . Beginning of the update method.
public void update(GameContainer gc, int delta) throws SlickException{//Access to the first sprite in the ArrayList object. Sprite01 redBallSprite = sprites.get(0);//Do the following for every sprite in the ArrayList // objectfor(int cnt = 0;cnt<sprites.size();cnt++){ //Get a reference to the Sprite01 object.Sprite01 thisSprite = sprites.get(cnt);//Ask the sprite to move according to its properties thisSprite.move();//Ask the sprite to bounce off the edge if it is at // an edge.thisSprite.edgeBounce( backgroundWidth,backgroundHeight);

Mostly same as before

The code in Listing 5 is mostly the same as code that you have seen before, so further explanation should not be necessary.

Test for a collision

The code in Listing 6 is new to this module. This code calls the isCollision method of the Sprite01 class to test for a collision between the current green sprite and the red sprite.

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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
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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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