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Housekeeping material
  • Module name: Slick0220: Simulating a pandemic
  • File: Slick0220.htm
  • Published: 02/07/13
  • Revised: 06/11/15 for 64-bit
  • Revised: 10/03/15
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In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale on Amazon.com showing me as the author. Ineither receive compensation for those sales nor do I know who does receive compensation. If you purchase such a book, please beaware that it is a copy of a module that is freely available on cnx.org and that it was made and published withoutmy prior knowledge.

Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.

Complete program listing

Complete listings of the code discussed in this module are provided in Listing 8 and Listing 9 .

Listing 8 . Source code for Slick0220.
/*Slick0220.java Copyright 2013, R.G.BaldwinThis program simulates the propagation of a fatal communicable disease within a population.A single infected sprite is introduced into a large population of sprites. The disease is spread by physicalcontact with an infected sprite. You can watch as the disease either spreads and kills theentire population or spreads for awhile, then recedes and dies out. Infected sprites are colored red. Healthysprites are colored green. A sound is emitted (for drama) each time there is contact between an infected sprite anda healthy sprite. The final outcome is determined both by chance and byseveral factors including: -The maximum life expectancy of an infected sprite-The maximum probability of infection due to contact with an infected sprite-The maximum degree of mobility of both infected and healthy sprites-The population density of sprites. The actual values for the first three factors for eachindividual are determined by the maximum value multiplied by a random number between 0 and 1.0.Instance variables are provided for each of these factors. You can modify the values and recompile the program toexperiment with different combinations of the factors. A good exercise for a student would be to create a GUIthat allows the factors to be entered more easily for purposes of experimentation.Tested using JDK 1.7 under WinXP *********************************************************/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; import org.newdawn.slick.Sound;import java.util.Random; import java.util.ArrayList;import java.util.Iterator; public class Slick0220 extends BasicGame{//The values of the following variables can be changed// to effect the spread of the disease.//Set the life expectancy of an infected sprite // in frames.int infectedSpriteLife = 96;//Set the maximum fraction of exposed sprites that will // become infected.float probabilityOfInfection = 0.5f;//Set the maximum step size that a sprite will move in // one frame.float maxStepSize = 1;//Set the initial number of sprites in the population. int numberSprites = 1000;//References to Sprite01 objects are stored here.ArrayList<Sprite01>sprites = new ArrayList<Sprite01>();//These variables are populated with references to Image // objects later.Image redBallImage; Image greenBallImage;//This variable is populated with a reference to a Sound// object later. Sound blaster;//These variables are populated with information about// the background image later. Image background = null;float backgroundWidth; float backgroundHeight;//This object is used to produce random values for a// variety of purposes. Random random = new Random();//This is the frame rate we would like to see and// the maximum frame rate we will allow. int targetFPS = 24;//----------------------------------------------------// public Slick0220(){//constructor//Set the title super("Slick0220, baldwin");}//end constructor //----------------------------------------------------//public static void main(String[] args)throws SlickException{ AppGameContainer app = new AppGameContainer(new Slick0220(),500,500,false); app.start();}//end main //----------------------------------------------------//@Override public void init(GameContainer gc)throws SlickException { //Create Image objects that will be used to visually// represent the sprites. redBallImage = new Image("redball.png");greenBallImage = new Image("greenball.png");//Create a Sound object. blaster = new Sound("blaster.wav");//Create a background image and save information // about it.background = new Image("background01.jpg"); backgroundWidth = background.getWidth();backgroundHeight = background.getHeight();//Add a red sprite as the first element in the // ArrayList object. This sprite carries the disease// into the population. //Put it in the center of the game window. Make the// direction of motion random. Make the speed of // motion (step size)random. Make the size random.// Specify a white (do nothing)color filter. 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()*0.5f,//scalenew Color(1.0f,1.0f,1.0f)));//color filter //This is an infected object. Set its life// expectancy. sprites.get(0).setLife((int)(random.nextFloat()*infectedSpriteLife)); //Populate the ArrayList object with green sprites.// Make the initial position random. Make the initial // direction of motion random. Make the speed// (step size) random. Make the size (scale) random. // Make the color filter white (do nothing).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 random.nextFloat()*maxStepSize,//step sizerandom.nextFloat()*maxStepSize,//step size 1.0f,//scalenew Color(1.0f,1.0f,1.0f)));//color filter }//end for loopgc.setTargetFrameRate(targetFPS);//set frame rate }//end init//----------------------------------------------------// @Overridepublic void update(GameContainer gc, int delta) throws SlickException{//Move all the sprites to their new positions. for(int cnt = 0;cnt<sprites.size();cnt++){ //Get a reference to the current 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 necessary thisSprite.edgeBounce(backgroundWidth,backgroundHeight); }//end for loop//Search for and process collisions between // infected (red) sprites and healthy (green)// sprites. Declare the green sprite to be exposed to // the disease when a collision occurs.for(int ctr = 0;ctr<sprites.size();ctr++){ //Get a reference to the Sprite01 object.Sprite01 testSprite = sprites.get(ctr); if(testSprite.getImage().equals(redBallImage)){//This is an infected sprite. Reduce its life. testSprite.setLife(testSprite.getLife() - 1);// Do the following for every sprite in the// ArrayList object. for(int cnt = 0;cnt<sprites.size();cnt++){ //Get a reference to the Sprite01 object.Sprite01 thisSprite = sprites.get(cnt);//Test for a collision between this sprite and // the infected test sprite.boolean collision = thisSprite.isCollision(testSprite);//Process a collision if it has occurred.// Exclude collisions between the testSprite // and itself and with other infected sprites.if((collision == true)&&(!thisSprite.getImage(). equals(redBallImage))){//A collision has occurred, set exposed to true thisSprite.setExposed(true);//Play a sound to indicate that a collision // has occurred.blaster.play(); }//end if}//end for loop}//end if on redBallImage//Make a cleanup pass through the ArrayList object Iterator<Sprite01>iterB = sprites.iterator();while(iterB.hasNext()){ Sprite01 theSprite = iterB.next();//Cause a percentage of the exposed objects to// contract the disease. Clear the others. if((theSprite.getExposed() == true)&&(random.nextFloat()<probabilityOfInfection)){ theSprite.setImage(redBallImage);theSprite.setLife((int)( random.nextFloat()*infectedSpriteLife));theSprite.setExposed(false); }else{//Eliminate the effects of the exposure theSprite.setExposed(false);}//end else//Remove dead sprites if(theSprite.getLife()<= 0){ iterB.remove();}//end if }//end while loop}//end outer for loop}//end update //----------------------------------------------------//public void render(GameContainer gc, Graphics g) throws SlickException{//set the drawing mode to honor transparent pixels g.setDrawMode(g.MODE_NORMAL);//Draw the background to erase the previous picture. background.draw(0,0);//Draw every sprite in the ArrayList object. for(int cnt = 0;cnt<sprites.size();cnt++){ sprites.get(cnt).draw();}//end for loop//Display the number of sprites remaining. g.drawString("Sprites remaining: " + (sprites.size()),100f,10f); }//end render}//end class Slick0220 //======================================================//

Questions & Answers

find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
I know this work
salma
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
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Abhi
how do they get the third part x = (32)5/4
kinnecy Reply
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
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ninjadapaul
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
ninjadapaul
I don't understand what the A with approx sign and the boxed x mean
ninjadapaul
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
ninjadapaul
oops. ignore that.
ninjadapaul
so you not have an equal sign anywhere in the original equation?
ninjadapaul
hmm
Abhi
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salma
Commplementary angles
Idrissa Reply
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Uday
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salma
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a perfect square v²+2v+_
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Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
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or infinite solutions?
Kim
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Al
y=10×
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Differences Between Laspeyres and Paasche Indices
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No. 7x -4y is simplified from 4x + (3y + 3x) -7y
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Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
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. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
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China
Cied
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I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
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Porter
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Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
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what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
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good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
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
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
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
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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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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