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Figure 2 . Graphic output from the earlier program.
Missing image.

Adding many more sprites would have been difficult

While it would have been possible to add more sprites to the animation by expanding the code used in that program, the code would havequickly gotten out of hand without the use of a sprite class and sprite objects. (To use the common jargon, that program architecture was not very scalable.)

Encapsulate complexity in a class

Basically, this program solves that problem by encapsulating many of the properties and methods that are useful for manipulating sprites into a classfrom which sprite objects can be instantiated. Most of the complexity is encapsulated in the class and thereby removed from the program that uses objectsof the class.

The scenario

This program shows a baseball coach ( Figure 1 ) being attacked by a swarm of vicious ladybug sprites. (Don't worry, we will find a way to save the coach in the next module.)

This program uses the class named Sprite01 to populate the game window with 1000 ladybug sprites in differentcolors with different sizes that fly around the game window in different directions with different speeds as shown in Figure 1 .

Discussion and sample code

The class named Sprite01

A complete listing of this class is provided in Listing 11 . I will not explain the entire class in detail in this module. Instead, I will provide an overview of the class and then explain various parts of theclass as I use them in this and the next two modules.

Beginning of the class named Sprite01

The beginning of the class named Sprite01 down through the constructor is shown in Listing 1 .

Listing 1 . Beginning of the class named Sprite01.
public class Sprite01{ Image image = null;//The sprite wears this imagefloat X = 0f;//X-Position of the sprite float Y = 0f;//Y-Position of the spritefloat width = 0f;//Width of the sprite float height = 0f;//Height of the spritefloat xStep = 1f;//Incremental step size in pixels - X float yStep = 1f;//Incremental step size in pixels - Yfloat scale = 1f;//Scale factor for draw method Color colorFilter = null;//Color filter for draw methodfloat xDirection = 1.0f;//Move to right for positivefloat yDirection = 1.0f;//Move down for positiveint life = 1;//Used to control life or death of spriteboolean exposed = false;//Used in the contagion program//Constructor public Sprite01(Image image,//Sprite wears this imagefloat X,//Initial position float Y,//Initial positionfloat xDirection,//Initial direction float yDirection,//Initial directionfloat xStep,//Initial step size float yStep,//Initial step sizefloat scale,//Scale factor for drawing Color colorFilter) throws SlickException {//Save incoming parameter values this.image = image;this.X = X; this.Y = Y;this.xDirection = xDirection; this.yDirection = yDirection;this.xStep = xStep; this.yStep = yStep;this.scale = scale; this.colorFilter = colorFilter;//Compute and save width and height of imagewidth = image.getWidth(); height = image.getHeight();}//end constructor

Questions & Answers

find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
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
sure. what is your question?
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
is it a question of log
Abhi
🤔.
Abhi
Commplementary angles
Idrissa Reply
hello
Sherica
im all ears I need to learn
Sherica
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Tamia
hii
Uday
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
Kim
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Al
y=10×
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
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...
Himanshu Reply
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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