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The overridden LoadContent method

The overridden LoadContent method is shown in Listing 3 .

Listing 3 . The overridden LoadContent method.

protected override void LoadContent() { //Create a new SpriteBatch object, which can be// used to draw textures. spriteBatch = new SpriteBatch(GraphicsDevice);//Load the image myTexture = Content.Load<Texture2D>("dogcropped"); //Initialize instance variablesspriteCol = 0; spriteRow = 0;frameWidth = myTexture.Width / spriteColLim; frameHeight = myTexture.Height / spriteRowLim;msPerFrame = fast; spriteEffect = flipEffect;winWidth = Window.ClientBounds.Width; }//end LoadContent

Load the image

The code to load the image, which is a sprite sheet, is the same as code that I have explained in earlier modules.

Initialization of variables

Some of the instance variables in Listing 1 were initialized when they were declared. Others couldn't be initialized when they were declared for a varietyof reasons.

Some could have been initialized in the constructor and others couldn't because the required information wasn't yet available.

I elected to initialize variables in the LoadContent method. By the time the LoadContent method executes, all of the information necessary to initialize the variables is available.

spriteCol and spriteRow

The variables named spriteCol and spriteRow will be used as counters to keep track of and to specify the column and row fora particular sprite image as shown in Figure 1 . The columns are numbered from 0 through 4 (five columns) and the rows are numbered from 0 through 1 (two rows).

frameWidth and frameHeight

These two variables specify the width and the height of an individual sprite image (see Figure 1 ). The width and the height of the individual sprite images are computed by dividing the total width of the image loaded in Listing 3 by the number of sprite images in a row and by dividing the total height of the imageloaded in Listing 3 by the number of sprite images in a column.

msPerFrame

Listing 1 declares two variables named fast and slow and initializes their values to 175 milliseconds and 525 millisecondsrespectively. These two values are used to switch the animation frame rate between a fast rate and a slow rate by assigning one or the other value to thevariable named msPerFrame . The fast value is assigned to msPerFrame in Listing 3 to specify a fast frame rate when the animation begins.

spriteEffect

The SpriteEffects enumeration lists the following effectsthat can be applied to a sprite when it is drawn:

  • FlipHorizontally
  • FlipVertically
  • None

The images in the raw sprite sheet shown in Figure 1 are all facing to the left. The FlipHorizontally enumeration value will be used to cause the images to face to the right when the dog is moving from left to rightacross the game window. The None enumeration value will be used to cause the images to face to the left (the default) when the dog is movingfrom right to left across the game window.

This is accomplished with the variables named spriteEffect , flipEffect , and noEffect . The value of spriteEffect is initialized to flipEffect in Listing 3 because the dog starts off moving from left to right.

Questions & Answers

what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
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
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
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
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
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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