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The sprite needs to face to the left when it is moving from right to left. This is the default state of the sprite sheet shown in Figure 1 so no flip is required.

The sprite needs to face to the right when it is moving from left to right. This requires a horizontal flip on the sprite images shown in Figure 1 .

Call the SpriteBatch.End method

The last statement in Listing 12 calls the SpriteBatch.End method to terminate the drawing process for the current iteration of the gameloop.

The visual frame rate

By default, the Update and Draw methods are each called approximately 60 times per second or approximately once every 16.67milliseconds. This can be changed by program code but it was not changed in this program.

The fast frame rate

When the program is drawing the sprite images in the top row of Figure 1 , a new sprite image is selected for drawing only once every 175 milliseconds (seethe variable named fast ). Therefore, the same sprite image is drawn during ten or eleven successive iterations of the game loop.

The slow frame rate

When the program is drawing the sprite images in the bottom row of Figure 1 , a new sprite image is selected for drawing only once every 525 milliseconds (seethe variable named slow ). Therefore, each of the sprites in the bottom row is drawn during about 33 successive iterations of the game loop.

Avoid flicker but animate more slowly

By drawing the sprite images 60 times per second, the image can be maintained on the computer screen with no visible flicker. By drawing the same imagemultiple times in succession, the overall visual frame rate can be slowed down to produce a pleasing animation effect.

The end of the program

Listing 13 shows the required call to the superclass of the Draw method, the end of the Draw method, the end of the class, and the end of the namespace.

Listing 13 . The end of the program.

//Required standard code. base.Draw(gameTime);}//end Draw method }//End class}//End namespace

Run the program

I encourage you to copy the code from Listing 14 . Use that code to create an XNA project. Compile and run the project. Experiment with the code, makingchanges, and observing the results of your changes. Make certain that you can explain why your changes behave as they do. Be sure to take the scale factorinto account as mentioned earlier .

Run my program

Click here to download a zip file containing my version of the program. Extract the folder named XNA0122Proj 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 .


Among other things, you learned:

  • How to create frame animation using a sprite sheet.
  • How to flip and scale sprite images when they are drawn.
  • How to implement different animation frame rates in the same program.
  • How to work with different groups of sprite images in the same program.
  • How to change the size of the game window.
  • How to create a Rectangle object.

Questions & Answers

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.
yes that's correct
I think
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
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
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 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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