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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

what is variations in raman spectra for nanomaterials
Jyoti Reply
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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
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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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