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Figure 4 . Cropped upper-left corner of the game window without honoring alpha transparency.

Missing image

Honoring alpha transparency is the default in XNA 4.0. Figure 4 was created by setting the Premultiply Alpha property (see Figure 7 ) of the image named gorightarrow.png to a value of False and then re-running the program.

Not a very exciting program

This program isn't very exciting because there is no motion and no sound. The program simply draws the same image in the same position during every iterationof the game loop. Despite that, this program will give us the opportunity to drill down into the technical aspects of several areas of the XNA framework.

Discussion and sample code

Creating a new Windows Game project

Before getting into the details of the code, I'm going to walk you through the steps involved in creating this Windows Game project using XNA.

Step 1: Create a new Windows Game project named XNA0118Proj

Pull down the Visual C# File menu and select New Project as shown in Figure 5 .

Figure 5 . Select New Project on the Visual C# File menu.

Missing image

Select a Windows Game project

Select XNA Game Studio 4.0 in the left pane of the New Project dialog. Select the Windows Game (4.0) icon and enter the name of your project in the Name field. Enter the storage location in the Location field and click the OK button that is off screen further to the right in Figure 6 .

Figure 6 . Select a Windows Game project.

Missing image

Step 2: Add your image file to the Content folder

If necessary, pull down the View menu and select Other Windows . Then select Solution Explorer and/or Properties Window so that they are exposed on the right side of the IDE as shown in Figure 7 . (Note that the initial view of the Properties window is different from that shown in Figure 7 .)

Figure 7 . Solutions explorer and properties window exposed.

Missing image

Add your image to the Content folder

Assuming that your project is named XNA0118proj , right click on the XNA0118projContent (Content) folder in the Solution Explorer . Select Add/Existing Item in the dialog that follows. Browse to the image file that you are going to use and click the Add button. A copy of the image file should appear in the Content folder.

The Asset Name

Click the image file name in the Content folder and the information in the Properties Window should change to describe that file. Note the value of the Asset Name property in the Properties Window . You will need it later. (In this example, the value of the Asset Name in Figure 7 is gorightarrow .)

Steps 3, 4, and 5: Write code

The next three steps involve writing code to upgrade the skeleton version of the class definition of the Game1 class. I will explain that new code later. For now, the three steps for this example program are:

  • Declare two instance variables named myTexture and spritePosition .
  • Add a statement to the LoadContent method to load the image.
  • Add statements to the Draw method to cause the image to be drawn in the game window.

Modify two overridden methods

As you saw in Listing 3 , there are five overridden methods in the class definition for the Game1 class that you can modify to customize the class for your game. This program modifies only two of those methods:

Questions & Answers

what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
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Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
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Abigail
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Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket 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
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Yasmin
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Cesar
I'm interested in nanotube
Uday
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what is system testing?
AMJAD
preparation of nanomaterial
Victor 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, Xna game studio. OpenStax CNX. Feb 28, 2014 Download for free at https://legacy.cnx.org/content/col11634/1.6
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