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Load a green ball image in the topmost Sprite object

Listing 11 calls the SetImage method to change the image in the topmost sprite at the end of the run from a blue ball to a green ball.

Listing 11 . Load a green ball image in the topmost Sprite object.

if(frameCnt == moveLim) { sprites[0].SetImage("greenball",Content); }//end if

This capability would be useful, for example to change a sprite's image into a fireball in the event of a collision with another sprite.

Maintain the frame counter

The code in Listing 12 keeps track of the count of the first moveLim iterations of the game loop.

Listing 12 . Maintain the frame counter.

if(frameCnt<moveLim) { frameCnt++;}//end if base.Update(gameTime);}//end Update method

The end of the overridden Update method

Then Listing 12 makes the required call to the Update method in the superclass and signals the end of the method.

The overridden Game1.Draw method

The overridden Game1.Draw method is shown in its entirety in Listing 13 .

Listing 13 . The overridden Game1.Draw method.

protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.CornflowerBlue);spriteBatch.Begin(); //Draw all sprites.for(int cnt = 0;cnt<sprites.Count;cnt++) { sprites[cnt].Draw(spriteBatch); }//end for loopspriteBatch.End(); base.Draw(gameTime);}//end Draw method //-------------------------------------------------//}//end class }//end namespace

Draw all Sprite objects

After calling the SpriteBatch.Begin method and before calling the SpriteBatch.End method, Listing 13 uses a for loop to call the Sprite.Draw method on every Sprite object whose reference is stored in the list, passing a reference to the SpriteBatch object as a parameter in each call.

Call the SpriteBatch.Draw method

This causes each object to execute the single statement belonging to the Draw method shown in Listing 4 . Thus, the code in Listing 13 causes each Sprite object to call the SpriteBatch.Draw method to draw itself at the position specified by the current value of its Position property.

Note that there are three different methods named Draw being used here:

  • Game1.Draw
  • SpriteBatch.Draw
  • Sprite.Draw

The end of the Game1.Draw method

After calling the SpriteBatch.End method, Listing 13 makes the required call to the superclass' Game.Draw method and then signals the end of the Game1.Draw method. Listing 13 also signals the end of the class and the end of the program.

Run the program

I encourage you to copy the code from Listing 14 and Listing 15 . Use that code to create an XNA project. Compile and run the project. Experiment withthe code, making changes, and observing the results of your changes. Make certain that you can explain 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 XNA0126Proj 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 .

Questions & Answers

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
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
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
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
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
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
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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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