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You learned how to design, create, and use a simple Sprite class. You also learned how to use a generic List object.


This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Xna0126-Using OOP - A Simple Sprite Class
  • File: Xna0126.htm
  • Published: 02/28/14

Financial : Although the Connexions site makes it possible for you to download a PDF file for thismodule at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, you should beaware that some of the HTML elements in this module may not translate well into PDF.

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In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale on Amazon.com showing me as the author. Ineither receive compensation for those sales nor do I know who does receive compensation. If you purchase such a book, please beaware that it is a copy of a module that is freely available on cnx.org and that it was made and published withoutmy prior knowledge.

Affiliation : : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.

Complete program listing

Complete listings of the XNA program files discussed in this module are provided in Listing 14 and Listing 15 below.

Listing 14 . Contents of the file named Sprite.cs

/*Project XNA0126Proj * This file defines a very simple version of a Sprite* class from which multiple Sprite objects can be * instantiated, loaded with an image, and drawn.* The Position property can be accessed by the user * to control the position at which the sprite is drawn.*******************************************************/ using System;using Microsoft.Xna.Framework; using Microsoft.Xna.Framework.Content;using Microsoft.Xna.Framework.Graphics; namespace XNA0126Proj {class Sprite { private Texture2D texture;private Vector2 position = new Vector2(0,0); //-------------------------------------------------//public Vector2 Position { get {return position; }set { position = value;}//end set }//end Position property accessor//-------------------------------------------------// //This constructor makes it possible to instantiate// a sprite without assigning an image to the sprite. public Sprite() {//constructor}//end noarg constructor //-------------------------------------------------////This constructor makes it possible to assign an // image to the sprite when it is instantiated.public Sprite(String assetName, ContentManager contentManager) {texture = contentManager.Load<Texture2D>(assetName); }//end constructor//-------------------------------------------------// //This method makes it possible to assign a new image// to the sprite. public void SetImage(String assetName,ContentManager contentManager) { texture =contentManager.Load<Texture2D>(assetName); }//end SetImage//-------------------------------------------------// public void Draw(SpriteBatch spriteBatch) {//Call the simplest available version of // SpriteBatch.DrawspriteBatch.Draw(texture,position,Color.White); }//end Draw method//-------------------------------------------------// }//end class}//end namespace

Listing 15 . Contents of the file named Game1.cs.

/*Project XNA0126Proj * This project demonstrates how to design and use a very* simple version of a Sprite class. ** One Sprite object is instantiated in the LoadContent * method. The object's reference is saved in a generic* List object. ** Twenty-three more Sprite objects are instantiated * while the game loop is running. A new object is* instantiated every 8th iteration of the game loop * until 24 objects have been instantiated. Their* references are saved in a generic List object. ** An image of a blueball is stored in 12 of the objects * and an image of a redball is stored in the other 12* objects. ** The Sprite objects are drawn in a diagonal line in* the game window. The line of Sprite objects moves * across the game window from upper left to lower right.* The Sprite objects stop moving when they reach the * bottom right corner of the game window.* * When the objects stop moving, the image in the* topmost Sprite object is changed from a blueball to a * greenball.* *****************************************************/ using System;using System.Collections.Generic; using Microsoft.Xna.Framework;using Microsoft.Xna.Framework.Graphics; using XNA0126Proj;namespace XNA0126Proj { public class Game1 : Microsoft.Xna.Framework.Game {GraphicsDeviceManager graphics; SpriteBatch spriteBatch;//References to the Sprite objects are stored in this // List object.List<Sprite>sprites = new List<Sprite>(); int maxSprites = 24;//Max number of sprites.int frameCnt = 0;//Game loop frame counter //This is the limit on the number of frames in which// the sprites are moved. int moveLim = 200;//-------------------------------------------------// public Game1() {//constructorgraphics = new GraphicsDeviceManager(this); Content.RootDirectory = "Content";//Set the size of the game window. graphics.PreferredBackBufferWidth = 450;graphics.PreferredBackBufferHeight = 450; }//end constructor//-------------------------------------------------// protected override void Initialize() {//No initialization required. base.Initialize();}//end Initialize //-------------------------------------------------//protected override void LoadContent() { spriteBatch = new SpriteBatch(GraphicsDevice);//Create the first sprite in the LoadContent // method using the noarg constructor.sprites.Add(new Sprite()); //Assign an image to the sprite.sprites[0].SetImage("blueball",Content);//More content is loaded in the Update method. }//end LoadContent//-------------------------------------------------// protected override void UnloadContent() {//No content unload required. }//end unloadContent//-------------------------------------------------// protected override void Update(GameTime gameTime) {//Create remaining sprites in the Update method to // simulate a game in which sprites come and go as// the game progresses. if(sprites.Count<(maxSprites)) { if(frameCnt % 8 == 0) {//Instantiate a new sprite every 8th frame. if((sprites.Count) % 2 == 0) {//Even numbered sprites sprites.Add(new Sprite("blueball",Content));} else {//Odd numbered sprites sprites.Add(new Sprite("redball",Content));}//end else }//end if on frameCnt}//end if on sprites.Count //Make all the sprites move.if(frameCnt<moveLim) { for(int cnt = 0;cnt<sprites.Count;cnt++) { sprites[cnt].Position = new Vector2( 10 * cnt + frameCnt,10 * cnt + frameCnt);}//end for loop }//end if//Change the image on the first sprite at the end // of the run. Could be used, for example to// change a sprite's image to a fireball in the // event of a collision.if(frameCnt == moveLim) { sprites[0].SetImage("greenball",Content); }//end if//Keep track of the count of the first moveLim // iterations of the game loop.if(frameCnt<moveLim) { frameCnt++;}//end if base.Update(gameTime);}//end Update 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


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
analytical skills graphene is prepared to kill any type viruses .
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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