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Learn to make sprites move at a constant speed in front of an image in the face of a widely varying frame rate. Also learn about a rudimentary form of collision detection.

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 teach you how to make sprites move at a constant speed in front of an image in the face of a widely varying frame rate. You will also learn about a rudimentary form of collision detection.

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 Figuresand Listings while you are reading about them.

Figures

  • Figure 1 . Image of a ladybug.
  • Figure 2 . Background image.
  • Figure 3 . Screen shot of the program named Slick0150a.
  • Figure 4 . Screen shot of the program named Slick0150b.
  • Figure 5 . Screen shot of the program named Slick0150b without correction for varying frame rate.

Listings

  • Listing 1 . Beginning of the class named Slick0150a.
  • Listing 2 . The init method for Slick0150a.
  • Listing 3 . Beginning of the update method for Slick0150a.
  • Listing 4 . Detection of collision with right edge.
  • Listing 5 . Test for collisions on other three sides of game window.
  • Listing 6 . The render method for Slick150a.
  • Listing 7 . The render method for Slick150b.
  • Listing 8 . Beginning of the update method for Slick0150b.
  • Listing 9 . Source code for the program named Slick0150a.
  • Listing 10 . Source code for the program named Slick0150b.

Preview

What you have learned

In the previous module, you learned that while there are many classes and interfaces in the Slick2D library with names that match the names of classes andinterfaces in the standard edition Java library, they are not the same.

You learned that you can access the Slick2D documentation at (External Link) . (A copy of the documentation is also included in the distribution zip file.)

You learned how to set the drawing mode so that bitmap images drawn in the game window will either honor or not honor transparent pixels.

You learned how to draw bitmap images in the game window using both the draw methods of the Image class and the drawImage methods of the Graphics class.

What you will learn

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
Naeem Reply
what happen with The nano material on The deep space.?
pedro Reply
It could change the whole space science.
puvananathan
the characteristics of nano materials can be studied by solving which equation?
sibaram Reply
plz answer fast
sibaram
synthesis of nano materials by chemical reaction taking place in aqueous solvents under high temperature and pressure is call?
sibaram
hydrothermal synthesis
ISHFAQ
how can chip be made from sand
Eke Reply
is this allso about nanoscale material
Almas
are nano particles real
Missy Reply
yeah
Joseph
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
Lale Reply
no can't
Lohitha
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
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
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
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
STM - Scanning Tunneling Microscope.
puvananathan
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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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