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There is nothing unusual about the code that was added to the Move method, so it shouldn't require further explanation beyond the embedded comments.

End of discussion of the Sprite class

There were no additional changes made to the Sprite class other than those identified above, so that will end the discussion of the Sprite class.

The Game1 class for XNA0132Proj

General information

This project demonstrates how to write a simple 2D arcade style game.

Ten spiders try to make it from the top to the bottom of a spider web.

The bottom of the web is guarded by two large ladybugs that are intent on eating the spiders.

If a ladybug collides with a spider, the spider gets eaten by the ladybug and removed from the population of spiders. If the player plays long enough, all ofthe spiders should eventually be eaten.

The objective of the game

The objective of the game is for the player to cause as many spiders as possible to be eaten by the ladybugs before they make it to the bottom of thegame window.

Ladybug control

The ladybugs can be moved by the player using either the keyboard or the mouse. Pressing the arrow keys moves one of the ladybugs. Holding down the A keyand pressing the arrow keys moves the other ladybug.

The player can drag one of the ladybugs with the mouse pointer by pressing the left mouse button. The player can drag the other ladybug by pressing theright mouse button.

Spiders are recycled

Even though the game begins with only ten spiders, those that are not eaten before they reach the bottom of the game window are recycled. If a spider makesit from the top to the bottom of the game window without being eaten, the spider wraps around and appears back at the top of the game window ready to start thetrip over.

Keeping score

A counter keeps track of the number of spiders that cross the bottom of the game window. On-screen text displays that number as the game progresses as shownin Figure 1 . Note, however, that if two or more spiders cross the bottom edge of the game window during the same iteration of the game loop, only one will becounted. In hindsight, therefore, the elapsed time required to cause the ladybugs to eat all of the spiders might be a better scorekeeping mechanism thancounting spider crossings.

Modifying the program to keep score on the basis of elapsed time might make a good student project.

Code for the Game1 Class

Listing 6 shows the beginning of the Game1 class along with the constructor in abbreviated form. By abbreviated form, I mean that much ofthe code is very similar to code that I have explained in earlier modules so I deleted that code from Listing 6 for brevity. You can view all of the code for the Game1 class in Listing 14 .

Listing 6 . Abbreviated beginning of the Game1 Class for the XNA0132Proj project.

namespace XNA0132Proj { public class Game1 : Microsoft.Xna.Framework.Game {GraphicsDeviceManager graphics; SpriteBatch spriteBatch;//code deleted for brevity //The following variable is used to count the number// of spiders that make it past the ladybugs and // reach the bottom of the game window.int spiderCount = 0; SpriteFont Font1;//font for on-screen textVector2 FontPos;//position of on-screen text //-------------------------------------------------//public Game1() {//constructor //code deleted for brevity}//end constructor

Questions & Answers

Do somebody tell me a best nano engineering book for beginners?
s. Reply
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Devang Reply
are you nano engineer ?
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
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.
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What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
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Sanket Reply
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Damian Reply
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Ramkumar Reply
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Sravani Reply
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Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
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silver nanoparticles could handle the job?
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this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
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Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
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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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