<< Chapter < Page
  Xna game studio     Page 10 / 12
Chapter >> Page >

The first two parameters

The first two parameters that identify the sprite sheet and the position at which to draw the image are the same as the version that I explained in anearlier module.

Three interesting parameters

Three of the parameters shown in the above list and in Listing 12 are parameters that are new to this module and in which I have an interest.

The remaining four parameters

Four of the parameters shown in the above list and in Listing 12 are new to this module, but I don't have any interest in them. The program simply passes "harmless" values to them.

The rectangle

The first thing that is new to this module in Listing 12 is the passing of a new object of type Rectangle as the third parameter.

With this version of the Draw method, only the contents of the sprite sheet that fall within that rectangle are drawn. The size andposition of the rectangle are specified with:

  • The coordinates of the upper left corner of the rectangle
  • The width and the height of the rectangle

The upper left corner of the rectangle

The upper left corner of the rectangle is specified in Listing 12 by the contents of the variables named xStart and yStart . The values in these two variables were assigned in Listing 5 . They specify the coordinates of the upper left corner of a small rectangle that contains one ofthe sprite images shown in Figure 1 .

The width and the height of the rectangle

The width and the height are specified by the contents of the variables named frameWidth and frameHeight . The values in these two variables were assigned in Listing 3 as the width and height of the small rectangle that contains one of the sprite images in Figure 1 .

The horizontal and vertical scale factors

The seventh parameter requires a Vector2D object containing the scale factors to be applied to the horizontal and vertical sizes of thesprite before it is drawn. (You learned about the Vector2D class in an earlier module.)

A new object

Listing 12 instantiates a new object of the Vector2D class that encapsulates the value stored in the variable named scale for the horizontal and vertical scale factors.

A value of 4 was assigned to the variable named scale when it was initialized in Listing 1 .

Four times larger

Therefore, the sprite images that are drawn in the game window are actually four times larger than the sprite images in the sprite sheet shown in Figure 1 . ( Note that the images were also scaled in Figure 1 for display purposes in order to make them more visible. You need to take that into account if you downloadthe sprite sheet and use it to replicate this program.)

Causing the sprite to face in the correct direction

The eighth parameter to the Draw method in Listing 12 requires an object of type SpriteEffects . The contents of the variable named spriteEffect are passed as this parameter. The contents of this variable were set to one of the following two values by thecode in Listing 9 :

  • noEffect - SpriteEffects.None
  • flipEffect - SpriteEffects.FlipHorizontally

The purpose of this parameter is to cause the sprite to face in the correct direction.

Questions & Answers

How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
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
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
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
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
characteristics of micro business
for teaching engĺish at school how nano technology help us
How can I make nanorobot?
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
how can I make nanorobot?
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
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.
what is the actual application of fullerenes nowadays?
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.
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.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!

Source:  OpenStax, Xna game studio. OpenStax CNX. Feb 28, 2014 Download for free at https://legacy.cnx.org/content/col11634/1.6
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Xna game studio' conversation and receive update notifications?