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Figure 12 . Heading for home.

missing image

Discussion and sample code

As usual, I will explain the code in this program in fragments. A complete listing of the class named Game1 is provided in Listing 11 near the end of the module.

The class named Game1

The class named Game1 begins in Listing 1 .

Listing 1 . Beginning of the class named Game1.

namespace XNA0124Proj { public class Game1 : Microsoft.Xna.Framework.Game {GraphicsDeviceManager graphics; SpriteBatch spriteBatch;private Viewport viewport; private Vector2 ufoPosition;private float backgroundScale; private float backgroundBaseScale;private float dynamicScale = 0.0f; int msElapsed;//Time since last new frame.int msPerFrame = 83;//30 updates per second Texture2D spaceTexture;//background imageTexture2D ufoTexture;//ufo image Vector2 spaceOrigin;//origin for drawing background

Listing 1 contains the declarations of several instance variables that will be used later in the program. I will explain their purpose when theyare used later.

The constructor for the class named Game1

The constructor for the class is shown in Listing 2 .

Listing 2 . The constructor for the class named Game1.

public Game1() {//constructor graphics = new GraphicsDeviceManager(this);Content.RootDirectory = "Content"; //Set the size of the game window, causing the// aspect ratio of the game window to match the // aspect ratio of the background image, which is// 640 wide by 480 high. graphics.PreferredBackBufferWidth = 450;graphics.PreferredBackBufferHeight = (int)(450.0*480/640);}//end constructor

Setting the size of the game window

The last two statements in Listing 2 set the size of the game window. You have seen code like this before in an earlier module. The only thing new here is the expression used to compute the value for the height of the gamewindow.

Maintaining the aspect ratio

The background image shown in Figure 3 is 640 pixels wide by 480 pixels high. When it is initially drawn, it will be scaled to a width of 450 pixels keepingthe same width to height ratio (the aspect ratio). The intent is that it will initially just fit inside the game window.

The expression used to compute the new height of the game window in Listing 2 causes the aspect ratio of the game window to match the aspect ratio of thebackground image.

The overridden LoadContent method

The overridden LoadContent method begins in Listing 3 .

Listing 3 . Beginning of the overridden LoadContent method.

protected override void LoadContent() { // Create a new SpriteBatch, which can be used to// draw textures. spriteBatch = new SpriteBatch(GraphicsDevice);//Load the two images. spaceTexture = Content.Load<Texture2D>("space"); ufoTexture = Content.Load<Texture2D>("ufo"); //Get a reference to the viewport.viewport = graphics.GraphicsDevice.Viewport;

The new material

The only thing that is new in Listing 3 is the last statement.

Viewport is a property of the GraphicsDevice class and is a Structure named Viewport .

Questions & Answers

How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
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 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
characteristics of micro business
for teaching engĺish at school how nano technology help us
How can I make nanorobot?
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
how can I make nanorobot?
what is fullerene does it is used to make bukky balls
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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