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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

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
learn
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
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
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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