how to generate barcode in c#.net with example Part I Getting Started in VS .NET

Generation Denso QR Bar Code in VS .NET Part I Getting Started

Part I Getting Started
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To do this, you need another kind of condition, one that performs a comparison. Figure 2-12 shows how such comparisons are created. This performs the first of these two tests.
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Condition Statement
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(redIntensity == 255)
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redCountingUP = false;
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FIGURE 2-12 Perform ng a compar son us ng the if cond t on
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The key to understanding what is happening is the comparison operator. When the program evaluates this condition, the values on the left and right of the operator are compared. If they are the same, the result of the comparison is true, and the statement that follows the condition is performed. If they are different, the result of the comparison is false, and the statement that follows the comparison is ignored. The sequence is the comparison operator. It is completely different from the operator, which we know as the gozzinta. It is important that you don t get these two confused. Unfortunately, you have both a gozzinta and a comparison taking place in the if statement because you want to put a new value into redCountingUp if the comparison succeeds. Fortunately, the compiler can usually detect when you use the wrong operator and produce a message. There are other comparison operators that can test to see if one value is greater or less than another; we will use these later. An if statement that uses a comparison operator can have an else part; it is just that we don t need one here. The final code to make our red intensity value move up and down ends up as follows:
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if (redIntensity == 255) redCountingUp = false; if (redIntensity == 0) redCountingUp = true; if (redCountingUp) redIntensity++; else redIntensity--;
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The program needs a second test to change the direction of the counting when the bottom limit of the intensity value is reached. The tests are performed before the intensity value is updated. This is because when the program starts running we want it to work correctly for any initial value of redIntensity. If the starting value is 255 the program must count down. If the starting value is 0 the program must count up. Note Pay very carefu attent on to the three statements shown n th s sect on Go back and
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read our or g na nstruct ons to Mrs Update and make sure you are abso ute y c ear how these have been converted nto C# statements that perform the job You w not ce that Mrs Update s or g na des gn has had to be changed so that t works w th any start ng va ue
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2 Programs, Data, and Pretty Colors
The Completed Mood Light
You now have the code that lets you create a smoothly pulsing mood light:
// The Game World - our color values byte redIntensity = 0; bool redCountingUp = true; byte greenIntensity = 0; bool greenCountingUp = true; byte blueIntensity = 0; bool blueCountingUp = true; protected override void Update(GameTime gameTime) { // Allows the game to exit if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed) this.Exit(); // if if if Update each color in turn (redIntensity == 255) redCountingUp = false; (redIntensity == 0) redCountingUp = true; (redCountingUp) redIntensity++; else redIntensity--;
if (greenIntensity == 255) greenCountingUp = false; if (greenIntensity == 0) greenCountingUp = true; if (greenCountingUp) greenIntensity++; else greenIntensity--; if (blueIntensity == 255) blueCountingUp = false; if (blueIntensity == 0) blueCountingUp = true; if (blueCountingUp) blueIntensity++; else blueIntensity--; base.Update(gameTime); } protected override void Draw(GameTime gameTime) { Color backgroundColor; backgroundColor = new Color(redIntensity, greenIntensity, blueIntensity); graphics.GraphicsDevice.Clear(backgroundColor); base.Draw(gameTime); }
These versions of Update and Draw produce a program that smoothly fades the screen between black and white. Sample Code: Mood Light The project n the 04 MoodL ght d rectory n the source code
resources for th s chapter conta ns the Update and Draw methods presented n th s sect on and prov des a smooth y chang ng mood ght that goes from dark to ght and back aga n
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