Filling a graphics path in Visual Studio .NET

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Listing 326 Filling a graphics path
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private void Form1_Paint(object sender, SystemWindowsFormsPaintEventArgs e) { // Create a solid brush SolidBrush greenBrush = new SolidBrush(ColorGreen); // Create a graphics path GraphicsPath path = new GraphicsPath(); // Add a line to the path pathAddLine(20, 20, 103, 80); // Add an ellipse to the path pathAddEllipse(100, 50, 100, 100); // Add three more lines pathAddLine(195, 80, 300, 80); pathAddLine(200, 100, 300, 100); pathAddLine(195, 120, 300, 120); // Create a rectangle and call // AddRectangle Rectangle rect = new Rectangle(50, 150, 300, 50); pathAddRectangle(rect); // Fill path eGraphicsFillPath(greenBrush, path); // Dispose of object greenBrushDispose(); } Figure 338 shows the output from Listing 326 As the figure shows, the fill method fills all the covered areas of a graphics path
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Figure 338 Filling a graphics path
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3224 The FillPie Method
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FillPie fills a pie section with a specified brush It takes four parameters: a brush, the rectangle of the ellipse, and the start and sweep angles The following code calls FillPie
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gFillPie(new SolidBrush(ColorRed), 00F, 00F, 100, 60, 00F, 900F); We will discuss the FillPie method in the pie chart application in Section 34
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3225 The FillPolygon Method
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FillPolygon fills a polygon with the specified brush It takes three parameters: a brush, an array of points, and a fill mode The FillMode enumeration defines the fill mode of the interior of the path It provides two fill modes: Alternate and Winding The default mode is Alternate In our application we will use a hatch brush So far we have seen only a solid brush A solid brush is a brush with one color only Ahatch brush is a brush with a hatch style and two colors These colors work together to support the hatch style The HatchBrush class represents a hatch brush We will discuss hatch brushes in more detail in 4 The code in Listing 327 uses FillPolygon to fill a polygon using theWinding mode
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Listing 327 Filling a polygon
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Graphics g = eGraphics ; // Create a solid brush SolidBrush greenBrush = new SolidBrush(ColorGreen); // Create points for polygon PointF p1 = new PointF(400F, 500F);
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PointF p2 = new PointF(600F, 700F); PointF p3 = new PointF(800F, 340F); PointF p4 = new PointF(1200F, 1800F); PointF p5 = new PointF(2000F, 1500F); PointF[] ptsArray = { p1, p2, p3, p4, p5 }; // Draw polygon eGraphicsFillPolygon(greenBrush, ptsArray); // Dispose of object greenBrushDispose(); Figure 339 shows the output from Listing 327 As you can see, the fill method fills all the areas of a polygon
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Figure 339 Filling a polygon
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3226 Filling Rectangles and Regions
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FillRectangle fills a rectangle with a brush This method takes a brush and a rectangle as arguments FillRectangles fills a specifiedseries of rectangles with a brush, and it takes a brush and an array of rectangles These methods also have overloaded forms with additional options For instance, if you're using a HatchStyle brush, you can specify background and foreground colors 4 discusses FillRectangle and its options in more detail
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Note
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The HatchBrush class is defined in the SystemDrawingDrawing2D namespace
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The source code in Listing 328 uses FillRectangle to fill two rectangles One rectangle is filled with a hatch brush, the other with a solid brush
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Listing 328 Filling rectangles
private void Form1_Paint(object sender, SystemWindowsFormsPaintEventArgs e) { // Create brushes SolidBrush blueBrush = new SolidBrush(ColorBlue); // Create a rectangle Rectangle rect = new Rectangle(10, 20, 100, 50); // Fill rectangle eGraphicsFillRectangle(new HatchBrush (HatchStyleBackwardDiagonal, ColorYellow, ColorBlack), rect); eGraphicsFillRectangle(blueBrush, new Rectangle(150, 20, 50, 100)); // Dispose of object blueBrushDispose(); } Figure 340 shows the output from Listing 328
Figure 340 Filling rectangles
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FillRegion fills a specified region with a brush This method takes a brush and a region as input parameters Listing 329 creates a Region object from a rectangle and calls FillRegion to fill the region