Understanding and Using Brushes in Visual Studio .NET

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41 Understanding and Using Brushes
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In the NET Framework library, brush-related functionality is defined in two namespaces: SystemDrawing and SystemDrawingDrawing2D The SystemDrawing namespace defines general brush-related classes and functionality, and theSystemDrawingDrawing2D namespace defines advanced 2D brush-related functionality For example, the Brush, SolidBrush, TextureBrush, and Brushes classes are defined in the SystemDrawing namespace; and the HatchBrush and GradientBrush classes are defined in theSystemDrawingDrawing2D namespace Before using brushes, obviously you must include the corresponding namespace to your application Alternatively, you can use the namespace as a prefix to the class; for example, SystemDrawingBrush represents the Brush class if you do not wish to include the SystemDrawing namespace in your application The code snippet in Listing 41 creates a redSolidBrush object and uses it to draw a rectangle This code is written on a form's paint event handler The first line gets the Graphics object of the form, and the second line creates a brush using the SolidBrush class, which later is used to fill a rectangle The last line disposes of the SolidBrush object
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Listing 41 Creating a solid brush
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Graphics g = eGraphics; SolidBrush redBrush = new SolidBrush(ColorRed); Rectangle rect = new Rectangle(150, 80, 200, 140); gFillRectangle(redBrush, rect); redBrushDispose();
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411 The Brush Class
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In the NET Framework library, the Brush class is an abstract base class, which means you cannot create an instance of it without using its derived classes All usable classes are inherited from the abstract Brush class Figure 41 shows all the Brush-derived classes that can be used in your GDI+ applications
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Figure 41 Classes inherited from the Brush class
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Applications generally call fill methods of the appropriate Graphics class, which in turn use brushes to fill GDI+ objects (such as an ellipse, an arc, or a polygon) with a certain kind of brush GDI+ provides four different kinds of brushes: solid, hatch, texture, and gradient Figure 42 shows the brush types and their classes
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Figure 42 Brush types and their classes
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412 The Brushes Class
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The Brushes class is a sealed class (it cannot be inherited)Brushes provides more than 140 static members (properties), and each of these members represents a brush with a particular color (including all the standard colors) For instance, the BrushesPink, BrushesRed, and BrushesGreen members represent Brush objects with the colors pink, red, and green, respectively
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413 Solid Brushes
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A solid brush is a brush that fills an area with a single solid color We create SolidBrush object by calling its constructor and passing a a Color structure as the only parameter The Color structure represents a color It has a static property for every possible color For example, ColorRed represents the color red The code snippet in Listing 42 creates three SolidBrush objects with three different colors: red, green, and blue
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Listing 42 Creating a SolidBrush object
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SolidBrush redBrush = new SolidBrush(ColorRed); SolidBrush greenBrush = new SolidBrush(ColorGreen); SolidBrush blueBrush = new SolidBrush(ColorBlue); SolidBrush has only one property of interest: Color, which represents the color of the brush Listing 43 uses red, green, and blue solid brushes and fills an ellipse, a pie, and a rectangle using the FillEllipse, FillPie, and FillRectangle methods of the Graphics class, respectively
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Listing 43 Using the SolidBrush class
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private void Form1_Paint(object sender, SystemWindowsFormsPaintEventArgs e) { Graphics g = eGraphics; // Create three SolidBrush objects // using the colors red, green, and blue SolidBrush redBrush = new SolidBrush(ColorRed); SolidBrush greenBrush = new SolidBrush(ColorGreen); SolidBrush blueBrush = new SolidBrush(ColorBlue); // Fill ellipse using red brush gFillEllipse(redBrush, 20, 40, 100, 120); // Fill rectangle using blue brush Rectangle rect = new Rectangle(150, 80, 200, 140); gFillRectangle(blueBrush, rect); // Fill pie using green brush gFillPie(greenBrush, 40, 20, 200, 40, 00f, 600f ); // Dispose of objects redBrushDispose(); greenBrushDispose(); blueBrushDispose(); } The output of Listing 43 draws an ellipse, a rectangle, and a pie, as Figure 43 shows
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