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This is another manifestation of an object knowing how to behave with minimal supervision. The overriddenGame.Draw method doesn't know and doesn't care where the Sprite object should be positioned or what image it should draw to represent itself. TheGame.Draw method simply knows that every Sprite object must redraw itself at the appropriate position with the appropriate image at this point in time.Decisions regarding position and image are left up to the Sprite object.

Regardless of whether or not a sprite has decided to move, it should cause itself to be redrawn in the game window because its image has just been replacedby a bunch of CornflowerBlue pixels.

Not the same approach as some other game engines

Some game engines take a different approach and in the interest of speed, redraw only those portions of the game window that have changed. This can leadto a great deal of complexity and it is often the responsibility of the game programmer to manage that complexity.

That is not the case with XNA. From the viewpoint of the XNA game programmer, the entire game window is redrawn once during every iteration of the game loop.This causes XNA to be easier to program than some other game engines. On the other hand, it might be argued that XNA sacrifices speed for simplicity.

The end of the program

Listing 18 also signals the end of the overridden Game.Draw method, the end of the Game1 class, and the end of the program.

Run the program

I encourage you to copy the code from Listing 19 and Listing 20 . Use that code to create an XNA project. (You should be able to use any small image filesas sprites.) Compile and run the project. Experiment with the code, making changes, and observing the results of your changes. Make certain that you canexplain why your changes behave as they do.

Run my program

Click here to download a zip file containing my version of the program. Extract the folder named XNA0128Proj from the zip file and save it somewhere on your disk. Start Visual C# 2010 Express and select Open Project... from the File menu. Navigate to the project folder and select the file with the extension of .sln . This should cause the project to open and be ready to run or debug as described in the earlier module titled Getting Started .

Summary

In this module, you learned how to add more sophistication to the Sprite class that was introduced in an earlier module.

What's next?

We're getting very close to being able to write a 2D arcade style game involving UFOs, space rocks, and power pills. There are just a few more toolsthat we need and I will show you how to create those tools in the upcoming modules.

The critical tools are:

  • The ability to detect collisions between sprites.
  • The ability to control the movement of one or more sprites using the keyboard or the mouse.

Once we have those tools, we can write a game where the challenge is to cause the UFO to successfully navigate across the game window without colliding with aspace rock, so I will concentrate on those two tools in the next few modules. (There are probably other games that we could also create using those tools.)

Questions & Answers

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
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
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
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
hi
Loga
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
how did you get the value of 2000N.What calculations are needed to arrive at it
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Source:  OpenStax, Xna game studio. OpenStax CNX. Feb 28, 2014 Download for free at https://legacy.cnx.org/content/col11634/1.6
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