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The big picture

Sifting through all of this detail in an attempt to get a big picture view, we see that we should:

  • Override Initialize for any special initialization and for loading any non-graphic resources. For example, sound files arenon-graphic resources.
  • Override LoadContent to load all graphic resources.
  • Override UnloadContent if any graphic resources need to be unloaded.
  • Override Update to implement all of the game logic.
  • Override Draw to draw an individual frame based on values created and stored by the overridden Update method, such as the current position of a sprite.
  • Be aware that there are two different approaches to controlling the timing of the game loop, depending on whether the IsFixedTimeStep property of the Game object is true or false. The default value is true, meaning that the game will attempt to callthe Update method on a fixed time interval even if that means that the Draw method doesn't get called during some iterations of the game loop.

The constructor for the Game1 class

Listing 5 shows the declaration of two instance variables followed by the constructor for the Game1 class. One of the instance variables is used in the constructor and the other is used later in theprogram.

Listing 5 . Constructor for the Game1 class.

GraphicsDeviceManager graphics; SpriteBatch spriteBatch;public Game1() { graphics = new GraphicsDeviceManager(this);Content.RootDirectory = "Content"; }// end constructor

What is a constructor?

A constructor is a special method-like structure that is executed once and only once during the instantiation of an object.

The first statement in the Main method in Listing 2 uses the new operator to cause the constructor to be executed. When the constructor completes its task, it returns a reference to theobject just constructed. That reference is stored in the local reference variable of type Game1 named game in Listing 2 .

A new GraphicsDeviceManager object

The first statement in the constructor in Listing 5 instantiates a new object of the class GraphicsDeviceManager and stores that object's reference in the instance variable named graphics .

The documentation for GraphicsDeviceManager isn't very descriptive. Here is some of what Aaron Reed (the author of the Learning XNA books from O'Reilly) has to say on the topic.

"This (GraphicsDeviceManager) is a very important object because it provides you, as a developer, with a way to access the graphics device on your ... The GraphicsDeviceManager object has a property calledGraphicsDevice that represents the actual graphics device on your machine."

He goes on to explain how the GraphicsDevice object acts as a conduit between your XNA program and the physical graphics device on yourmachine.

Passing the this keyword as a parameter

Note the parameter that is passed to the GraphicsDeviceManager constructor in Listing 5 . The documentation tells us that the parameter must be of type Game and is the Game that the GraphicsDeviceManager should be associated with.

I don't recall having discussed the keyword this earlier in this collection of modules. According to Jesse Liberty ( Programming C# from O'Reilly)

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
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.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
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
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
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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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