<< Chapter < Page
  Xna game studio     Page 3 / 11
Chapter >> Page >

These three accessor methods are straightforward and shouldn't require further explanation.

The property accessor method for Speed

Humans usually find it easier to think in terms of speed such as miles per hour while it is sometimes easier to write computer programs that deal with the reciprocal of speed such as hours per mile .

The property accessor method for the property named Speed is shown in Listing 3 .

Listing 3 . The property accessor method for Speed.

//Speed property accessor. The set side should be // called with speed in moves/msec. The get side// returns speed moves/msec. public double Speed {get { //Convert from elapsed time in msec/move to// speed in moves/msec. return elapsedTimeTarget/1000;} set {//Convert from speed in moves/msec to // elapsed time in milliseconds/move.elapsedTimeTarget = 1000/value; }//end set}//end Speed property accessor

The set side

The set side of the property accessor method for the Speed property receives the incoming value as moves per millisecond . The code converts this value to milliseconds per move and saves it in the instance variable named elapsedTimeTarget mentioned earlier.

This is the target for the elapsed time in milliseconds from one movement to the next movement of the sprite in the game window. Every time a sprite moves,it moves the same distance. Therefore, the apparent speed of sprite movement as seen by the viewer can be controlled by controlling the elapsed time betweenmovements.

The get side

The get side of the property accessor method for the Speed property converts the returned value from milliseconds per move back to moves per millisecond .

The constructor

The constructor for the Sprite class is shown in Listing 4 .

Listing 4 . The constructor for the Sprite class.

public Sprite(String assetName, ContentManager contentManager,Random random) { image = contentManager.Load<Texture2D>(assetName); this.random = random;}//end constructor

Load an image

The constructor loads an image for the sprite when it is instantiated. Therefore, it requires an Asset Name for the image and a reference to a ContentManager object.

A random number generator

The constructor also requires a reference to a Random object capable of generating a sequence of pseudo random values of type double .

The purpose of the random number generator will become clear later.

The program should use the same Random object for all sprites to avoid getting the same sequence of values for different sprites whentwo or more sprites are instantiated in a very short period of time.

The SetImage method

The SetImage method is shown in Listing 5 .

Listing 5 . The SetImage method.

public void SetImage(String assetName, ContentManager contentManager) {image = contentManager.Load<Texture2D>(assetName); }//end SetImage

This method can be called to load a new image for an existing sprite. The method is essentially the same as a method having the same name that Iexplained in an earlier module, so no further explanation should be required.

Questions & Answers

what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
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
Daniel
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
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
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.
Tarell
what is the actual application of fullerenes nowadays?
Damian
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.
Tarell
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.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Xna game studio. OpenStax CNX. Feb 28, 2014 Download for free at https://legacy.cnx.org/content/col11634/1.6
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Xna game studio' conversation and receive update notifications?

Ask