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a value of 0 is entirely transparent and 255 is entirely opaque In a NET Compact Framework program, all colors have an alpha value of 255, which means that all colors are 100% opaque The following code draws the window background using a light gray color:
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private void FormMain_Paint( object sender, PaintEventArgs e) { Graphics g = eGraphics; gClear(ColorFromArgb(204,204,204)); }
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1132 Creating Brushes A brush specifies the color and pattern to use for area-filling methods, such as FillRectangle The NET Compact Framework does not support patterns in brushes, however, so a brush just specifies the color when filling areas Brushes also specify the color to use when drawing text The second parameter to the DrawString method, for example, is a brush The desktop NET Framework supports five different kinds of brushes, including solid brushes, bitmap brushes, and hatch brushes Windows CE supports solid brushes and bitmap brushes but not hatch brushes And in the NET Compact Framework, things are even simpler: Only solid brushes are supported, by the SolidBrush19 class This class has a single constructor, which takes a single parameter Color The SolidBrush constructor is defined as follows:
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public SolidBrush( Color color);
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With one constructor, it is natural to assume that there is one way to create a solid brush But because there are three ways to define a color, there are three ways to create a brush:
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Using the system colors Using a named color Using an RGB value
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The following subsections discuss each of these briefly
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19 SystemDrawingSolidBrush
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Creating Graphical Output 11321 Creating Brushes with System Colors
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The following code creates a brush from a system color This brush is suitable for drawing text within a program s main form or in a dialog box
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Brush brText = new SolidBrush(SystemColorsWindowText);
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The resulting brush provides the same color the operating system uses to draw text You are not required to select this color, but in doing so you help ensure that your application fits into the color scheme established by the user There might be reasons to design your own color scheme For example, when dealing with financial figures you might display positive numbers in black and negative numbers in red Or perhaps when displaying certain types of documents you could highlight keywords in different colors, in the same way that Visual Studio NET highlights language keywords in blue To handle these situations, you need to specify the brush color with one of the two other color-defining schemes: using either named colors or RGB colors
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11322 Creating Brushes with Named Colors
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Here are examples of creating brushes using named colors:
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Brush brRed = new SolidBrush(ColorRed); Brush brPaleGreen = new SolidBrush(ColorPaleGreen); Brush brLightBlue = new SolidBrush(ColorLightBlue);
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You might wonder where these color names come from Some such as
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Red are, of course, names for common colors But when you read through the list of names, you see colors such as AliceBlue, GhostWhite, and WhiteSmoke The colors are sometimes called HTML color names because
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the more exotic names were first supported as color names in HTML by various browsers Officially, however, HTML 40 includes only 16 color names, not the 140+ names defined in the Color structure
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11323 Creating Brushes with RGB Values
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To create a brush using an RGB value, call the FromArgb method in the Color class and pass the return value to the SolidBrush constructor This method accepts three integer parameters, one each for red, green, and blue Here is how to create three brushes from RGB triplets:
Brush brRed = new SolidBrush(ColorFromArgb(255, 0, 0)); Brush brGreen = new SolidBrush(ColorFromArgb(0, 255, 0)); Brush brBlue = new SolidBrush(ColorFromArgb(0, 0, 255));
113 Raster Graphics
1133 Creating Bitmaps A bitmap is a two-dimensional array of pixels with a fixed height and a fixed width Bitmaps have many uses One is to hold scanned images, such as a company logo Photographs are stored as bitmaps, commonly in the highly compressed format of JPEG20 files Bitmaps can be used to create interesting effects on a display screen, such as smooth scrolling and seamless animation Bitmaps are often used to store complex images that a program can easily draw in one or more locations by making a single method call As useful as this approach can be, it is important to always remember that bitmaps require a lot of room both in memory and in the file system If you plan to include any bitmaps with your program, give some thought to the format of those bitmaps We address this issue later in this chapter Bitmaps are sometimes referred to as off-screen bitmaps because of the important role bitmaps have historically played in supporting display screen graphics The Bitmaps on the Desktop sidebar discusses how bitmaps are used on desktop versions of Windows to support various user interface objects That same support does not exist in Windows CE because of memory constraints But bitmaps are still available to Windows CE programs for all of their other uses