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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

who was the first nanotechnologist
Lizzy Reply
k
Veysel
technologist's thinker father is Richard Feynman but the literature first user scientist Nario Tagunichi.
Veysel
Norio Taniguchi
puvananathan
Interesting
Andr
I need help
Richard
anyone have book of Abdel Salam Hamdy Makhlouf book in pdf Fundamentals of Nanoparticles: Classifications, Synthesis
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pedro Reply
It could change the whole space science.
puvananathan
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sibaram Reply
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sibaram
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sibaram
hydrothermal synthesis
ISHFAQ
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is this allso about nanoscale material
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yeah
Joseph
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no can't
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where is the latest information on a no technology how can I find it
William
currently
William
where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
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
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Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
has a lot of application modern world
Kamaluddeen
yes
narayan
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
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
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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
STM - Scanning Tunneling Microscope.
puvananathan
While the American heart association suggests that meditation might be used in conjunction with more traditional treatments as a way to manage hypertension
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in a comparison of the stages of meiosis to the stage of mitosis, which stages are unique to meiosis and which stages have the same event in botg meiosis and mitosis
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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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