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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 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?
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.
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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