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Drawing the on-screen text

I will explain the code in the Game1 class of the project named XNA0132ProjA that produced the screen output shown in reduced form in Figure 4 .

Figure 4 . Demonstration of on-screen text with the Lindsey font.

missing image

As usual, I will explain the code in fragments. A complete listing of the Game1 class is provided in Listing 12 near the end of the module.

Here is my interpretation of the coding steps for displaying on-screen text in the game window.

  • Add a Sprite Font to your project as described above.
  • Declare an instance variable of type SpriteFont to refer to a SpriteFont object. (See Listing 1 .)
  • Declare an instance variable of type Vector2 to refer to an object that specifies the position of your text relative to the upperleft corner of the game window. (See Listing 1 .)
  • Create a SpriteFont object by calling the ContentManager.Load method, specifying the SpriteFont class and the Asset Name of the imported font in your overridden LoadContent method. Save the object's reference in the instance variable declared earlier. (See Listing 1 .)
  • Instantiate a new Vector2 object to specify the position of the text in the game window in the LoadContent method. Save the object's reference in the instance variable declaredearlier. (See Listing 1 .) The X and Y component values of the Vector2 object can be modified later in the Update method if needed.
  • Write the typical SpriteBatch.Begin and SpriteBatch.End method calls in the overridden Game.Draw method. (See Listing 2 and Listing 3 .)
  • Create a string in the LoadContent , Update , or Draw methods containing the text that will be displayed in the game window. (See Listing 2 .)
  • Instantiate a Vector2 object in the LoadContent , Update , or Draw methods that specifies the origin of the text string, which will be drawn at the previously computedposition of the text string. (See Listing 2 .)
  • Compute values for the other parameters to the SpriteBatch.DrawString method as needed.
  • Call the SpriteBatch.DrawString method between the SpriteBatch.Begin and SpriteBatch.End methods. (See Listing 3 .)

The project named XNA0132ProjA

Listing 1 shows the beginning of the Game1 class and the overridden LoadContent method for the project named XNA0132ProjA . This project, which is different from XNA0132Proj to be discussed later, demonstrates how to draw onscreen text.

Listing 1 . Beginning of the Game1 class and the overridden LoadContent method for the project named XNA0132ProjA.

namespace XNA0132ProjA { public class Game1 : Microsoft.Xna.Framework.Game {GraphicsDeviceManager graphics; SpriteBatch spriteBatch;SpriteFont Font1; Vector2 FontPos;//-------------------------------------------------// protected override void LoadContent() {spriteBatch = new SpriteBatch(GraphicsDevice); //Create a new SpriteFont object.Font1 = Content.Load<SpriteFont>("Lindsey"); //Create a new Vector2 object to center the text// in the game window. FontPos = new Vector2(graphics.GraphicsDevice.Viewport.Width / 2, graphics.GraphicsDevice.Viewport.Height / 2);}//end LoadContent method

Questions & Answers

How we are making nano material?
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What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
what is Nano technology ?
Bob Reply
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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
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Stoney Reply
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Introduction about quantum dots in nanotechnology
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what does nano mean?
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nano basically means 10^(-9). nanometer is a unit to measure length.
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Damian Reply
absolutely yes
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s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
how can I make nanorobot?
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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
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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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