<< Chapter < Page Chapter >> Page >

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

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
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
hey
Giriraj
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
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!
Jobilize.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