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Learn how to develop a Sprite class from which you can instantiate and animate swarms of sprite objects.

Table of contents

Preface

This module is one in a collection of modules designed to teach you about the anatomy of a game engine.

Although the modules in this collection will concentrate on the Java game library named Slick2D, theconcepts involved and the knowledge that you will gain is applicable to different game engines written in different programming languages as well.

The purpose of this module is to teach you how to develop a sprite class (see Sprite01 ) from which you can instantiate and animate swarms of sprite objects.

Viewing tip

I recommend that you open another copy of this module in a separate browser window and use the following links to easily find and view the imagesand listings while you are reading about them.

Figures

  • Figure 1 . Graphic output from program named Slick0200.
  • Figure 2 . Graphic output from the earlier program.

Listings

  • Listing 1 . Beginning of the class named Sprite01.
  • Listing 2 . Beginning of the class named Slick0200.
  • Listing 3 . Beginning of the init method.
  • Listing 4 . Populate the array.
  • Listing 5 . The update method.
  • Listing 6 . The move method of the Sprite01 class.
  • Listing 7 . The edgeBounce method of the Sprite01 class.
  • Listing 8 . The render method.
  • Listing 9 . The draw method of the Sprite01 class.
  • Listing 10 . Source code for the program named Slick0200.
  • Listing 11 . Source code for the sprite class named Sprite01.

Preview

I will present and explain a program that uses a class named Sprite01 (see Listing 11 ) to produce an animation of 1000 ladybug sprite objects flying around inside thegame window as shown in Figure 1 .

Figure 1 . Graphic output from program named Slick0200.
Missing image.

The frame rate

As you can see from the text in the upper-left corner of Figure 1 , the program is running at 62 frames per second. My rather old desktop computer can maintain this frame rate up to about 7000 sprite objects.Beyond that, it can no longer handle the computing load and the frame rate begins to decrease.

What you have learned

In the previous module, you learned how to use objects of the SpriteSheet class and the Animation class to perform relatively complex sprite sheet animations.

What you will learn

In this module, you will learn how to develop a sprite class from which you can instantiate and animate swarms of sprite objects. In the next two modules,you will learn how to put that class to work.

General background information

While the Slick2D library provides many useful classes, there is nothing to stop you from developing your own classes to work in combination with theSlick2D library classes. That is the thrust of this module.

In an earlier module titled Slick0150: A first look at sprite motion, collision detection, and timing control , you learned how to cause a single sprite to bounce around inside the game window as shown in Figure 2 .

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
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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