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What is the overall behavior?

This method receives a list of Sprite objects as an incoming parameter. It tests for a collision with each sprite in the list beginning withthe sprite at the head of the list. If it detects a collision with a sprite, it stops testing immediately and returns a reference to the Sprite object for which it found the collision. If it doesn't find a collision with anysprite in the list, it returns null.

The IsCollision method code

The new method named IsCollision begins in Listing 5 .

Listing 5 . Beginning of a new IsCollision method.

public Sprite IsCollision(List<Sprite>target) { Rectangle thisRectangle =new Rectangle((int)(position.X), (int)(position.Y),image.Width, image.Height);

The code in Listing 5 constructs a new Rectangle object that describes the rectangular area currently occupied by the sprite's imagerelative to the upper left corner of the game window. The Rectangle object's reference is saved in the local variable named thisRectangle .

Test for a collision with other sprites

Listing 6 begins by declaring a pair of local variables named targetRectangle and cnt .

The variable named targetRectangle will be used to store a reference to a rectangular area that currently contains a target sprite. Thevariable named cnt will be used as a loop counter.

Listing 6 . Test for a collision with other sprites.

Rectangle targetRectangle; int cnt = 0;while(cnt<target.Count){ targetRectangle = target[cnt].GetRectangle(); if(thisRectangle.Intersects(targetRectangle)){return target[cnt];}//end if cnt++;}//end while loop return null;//no collision detected}//end IsCollision

A while loop

Then Listing 6 executes a while loop that:

  • Calls the GetRectangle method on the next Sprite object in the list (see Listing 4 ).
  • Tests to determine if this sprite's rectangle intersects the target sprite's rectangle.
  • Returns a reference to the target Sprite object if a collision is detected; keeps looping otherwise.

The first return statement

Executing a return statement in the middle of the while loop terminates the loop and also terminates the method.

The second return statement

If no collision is detected, the loop terminates when all of the Sprite objects in the list have been tested.

At that point, Listing 6 executes a different return statement to return null and terminate the method. The null value is returned in place of a reference to a Sprite object to signal that no collision was detected.

The end of the Sprite class

Listing 6 signals the end of the IsCollision method, which is also the end of the changes made to the Sprite class. Once again, you will find a complete listing of the new Sprite class in Listing 14 near the end of the module.

The Game1 class

I will explain only those portions of the Game1 class that are substantially new to this program. You will find a complete listing ofthe Game1 class in Listing 15 near the end of the module.

The overridden LoadContent method

The only code that is substantially new prior to the LoadContent method is the declaration of an instance variable of type Sprite named spiderWeb . Therefore, I will skip down and begin my discussion with the overridden LoadContent method, which begins in Listing 7 .

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
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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
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what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
how to synthesize TiO2 nanoparticles by chemical methods
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what's the program
Jordan
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what chemical
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how did you get the value of 2000N.What calculations are needed to arrive at it
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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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