The Color Structure in .NET

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522 The Color Structure
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The Color structure represents ARGB colors in GDI+ This class has a static member property for almost every possible color For example, ColorBlack and ColorRed represent the colors black and red, respectively Besides these static properties, this structure includes read-only properties A, R, G, and B that represent the alpha, red, green, and blue components, respectively
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The IsEmpty property checks whether aColor structure has been initialized (if not, there is no color) TheKnownColor enumeration contains more than 300 colors, and each color is represented by its name For example, Blue and Black members represent the colors blue and black, respectively KnownColor also defines color combinations, such asLimeGreen and LightBlue You can also find system colors such as ActiveBorder, ActiveCaption, Control, ControlText, Highlight, and InactiveBorder, using the IsSystemColor enumeration The Name property represents the name of the color, which is a read-only property The Transparent property is a static property that represents a transparent color The Color structure also provides some methods The FromArgb method creates a color from the four ARGB components This method has different overloaded forms with which an application can create a Color object from an alpha value only; from an alpha value with a Color object only; from three values (red, green, and blue); and from all four values (alpha, red, green, and blue) The FromKnownColor and FromName methods create a Color object from a predefined color or from the name of a predefined color, respectively The FromKnownColor method takes only one argument, of KnownColor enumeration The FromName method takes one argument of string type as the color name All members defined in the KnownColor enumeration are valid names for this method
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Note
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All three "from" methods (FromArgb, FromKnownColor, and FromName) are static
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The ToArgb and ToKnownColor methods convert an ARGB or KnownColor value, respectively, to aColor structure Listing 51 illustrates different ways to create Color objects and use them in an application to draw various graphics objects, including a filled ellipse with a red brush, a filled rectangle with a blue brush, and a line with a green pen The application first creates four Color objects via the FromArgb, FromName, FromKnownColor, and Empty methods The FromArgb method creates a translucent pure redColor object, using parameters 120, 255, 0, and 0 The FromName method creates a Color object from the string "Blue" TheFromKnownColor method creates a color object from the known color Green
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Listing 51 Using the methods and properties of the Color structure
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private void ColorStructMenu_Click(object sender, SystemEventArgs e) { // Create Graphics object Graphics g = thisCreateGraphics(); // Create Color object from ARGB Color redColor = ColorFromArgb(120, 255, 0, 0); // Create Color object form color name Color blueColor = ColorFromName("Blue"); // Create Color object from known color Color greenColor = ColorFromKnownColor(KnownColorGreen); // Create empty color Color tstColor = ColorEmpty; // See if a color is empty if(tstColorIsEmpty) { tstColor = ColorDarkGoldenrod;
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} // Create brushes and pens from colors SolidBrush redBrush = new SolidBrush(redColor); SolidBrush blueBrush = new SolidBrush(blueColor); SolidBrush greenBrush = new SolidBrush(greenColor); Pen greenPen = new Pen(greenBrush, 4); // Draw GDI+ objects gFillEllipse(redBrush, 10, 10, 50, 50); gFillRectangle(blueBrush, 60, 10, 50, 50); gDrawLine(greenPen, 20, 60, 200, 60); // Check property values MessageBoxShow("Color Name :"+ blueColorName + ", A:"+blueColorAToString() + ", R:"+blueColorRToString() + ", B:"+blueColorBToString() + ", G:"+blueColorGToString() ); // Dispose of GDI+ objects redBrushDispose(); blueBrushDispose(); greenBrushDispose(); greenPenDispose(); gDispose(); } Figure 51 shows the output from Listing 51
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Figure 51 Creating colors using different methods
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The GetBrightness, GetHue, and GetSaturation methods return a color's brightness, hue, and saturation component values, respectively Listing 52 reads the hue, saturation, and brightness components of a color and displays their values on the form by using the DrawString method
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