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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

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.
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
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?
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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