upc internet hiba 2017 Controlling Color in VB.NET

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Controlling Color
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At this point you can see that you add C# statements to the Draw method to change what is drawn on the screen. You also know that XNA makes use of a Color structure to lump
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Programs, Data, and Pretty Colors
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together information that describes a particular color and that you can create your own Color variables that contain a specific amount of red, green, and blue. Finally, you have managed to make a program that uses a color variable to set the screen to any color you like. Next you want the light to change color over time, to get a nice soothing mood light effect. This sounds like hard work, and like every great programmer, I really hate hard work, but actually it turns out to be quite easy. To discover how to do this, you have to find how XNA is connected to the game programs that you write. The way this works makes use of C# classes.
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Games and Classes
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The game program is actually a class called Game1. A class is a collection of abilities (methods) and data (variables) that forms part of a program. You can put as much stuff as you like inside a single class. A class is usually constructed to look after one particular part of a system. Later on in this book you ll use classes called GameSprite, Player, and Card. In the commercial world, you ll find classes called Receipt, Invoice, and StockItem. When XNA Game Studio 2.0 created our project, it gave the game class the name Game1. You can rename this if you wish; you ll see how to do this later in the book.
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Classes and Behaviors
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A behavior is something that a class can be asked to do. A particular method performs a particular behavior. You used the Clear behavior of the GraphicsDevice. When you use Clear, this causes the code in the Clear method to be obeyed to clear the screen. You don t need to know how Clear works; you just need to know that you can feed it with information to tell it what color you want to use. The Game1 class provides Update and Draw behaviors (among others) so that XNA can ask Game1 to update the state of the game and draw it on the display. Figure 2-5 shows how the Update and the Draw methods are part of the Game1 class.
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Update Method XNA Draw Method Game 1 class Game World Data
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Figure 2-5
The Game1 class and XNA
The job of the Update method is to update the values in the game. The job of the Draw method is to use these values to draw the display. The XNA system will call Draw and Update at regular
Part I
Getting Started
intervals when the game is running. You have already used methods provided by other classes; you know that the Clear method can be called to clear the display to a particular color. Draw and Update are methods that you provide for use by XNA.
Classes as Offices
You can think of Update and Draw as two people sitting in an office called Game1. Each has their own telephone. Every now and then, Mr. Draw s phone rings, and a voice on the other end of the line tells Mr. Draw that a sixtieth of a second has gone by. Mr. Draw then jumps up, gets the value of the background color from the desk, and then uses his phone to dial the number of the Ms. Clear in the GraphicsDevice office down the hall and asks her to clear the screen to that color. She has a set of paint cans and can fill the screen with any color that she is asked to use. At a similar interval, the Update phone in the Game1 office rings and tells Mrs. Update that a sixtieth of a second has gone by. She jumps up, goes up to the table in the office, and updates the information on the bits of paper on it. You can see how this would look in Figure 2-6.
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