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When you create a Graphics object using the CreateGraphics method, you must dispose of that object explicitly by calling the Dispose method to release the resources associated with it
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You can also use the FromImage, FromHwnd, and FromHdc static methods of the Graphics class to create Graphics objects from images, window handles, and window handles to device contexts, respectively We will discuss these methods in more detail in 3 (Section 3233 ) The following code creates a Bitmap object and calls the static FromImage method, using a Bitmap object as an input parameter, which returns a Graphics object
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Bitmap bmp = new Bitmap(600,400,PixelFormatFormat32bppArgb); Graphics g = GraphicsFromImage(bmp); The following code creates a Graphics object from a window handle In this example,this refers to a Windows Form You can even pass Form1Handle if your form is Form1
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Graphics g = GraphicsFromHwnd(thisHandle);
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234 Creating Pens and Brushes
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Once you have a Graphics object, the next step is to decide what you're going to draw on the surface You may need one or more of the three objects: pen, brush, or image In this chapter we will concentrate on pens and brushes only Images are discussed in s 7 and 8 In GDI+ the Pen and Brush classes represent a pen and a brush, respectively The abstract Brush class functionality is accessed through its derived classes: SolidBrush and HatchBrush, among others Pens are used when you need to draw lines, rectangles, and curve boundaries Brushes are used when you need to fill graphics objects 4 discusses pens and brushes in detail The Pen class constructor takes as arguments the color and width of the pen The following code creates a red pen with a width of 3 pixels and a black pen with a width of 1 pixel The Pens class provides static members, each of which represents a pen with a particular color
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Pen redPen = new Pen(ColorRed, 3); Pen blackPen = PensBlack; The SolidBrush class represents a solid brush in GDI+ This class's constructor takes a color as an argument The following code creates a green solid brush
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SolidBrush greenBrush = new SolidBrush(ColorGreen);
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235 Drawing Graphics Shapes
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Once you have the surface, pens, and/or brushes, you can draw lines, shapes, curves, or images The Graphics class provides draw and fill methods to draw and fill graphics shapes, curves, or images For example, the FillRectangle method draws a rectangle with a filled color, and DrawRectangle draws the boundary of a rectangle with the specified pen Draw methods take a pen as an argument, and fill methods take a brush We override the OnPaint method and write the code inListing 21 on this method As Listing 21 shows, we first set the smoothing mode of the Graphics object by setting itsSmoothingMode property The SmoothingMode enumeration is defined in theSystemDrawingAdvanced2D namespace and is used to set the quality of a graphics object In our code, we set the smoothing mode to anti-aliasing We will discuss this in more detail in s 8 and 9 After that we create a rectangle, two pens, and a solid brush In the next code snippet, we call the DrawRectangle, FillEllipse, and DrawLine methods The DrawRectangle method draws the boundaries of a rectangle, theFillEllipse method fills an ellipse with the specified brush, and the DrawLine method draws a line using the specified pen 3 will discuss the fill and draw methods in more detail
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Listing 21 Drawing lines, rectangles, and ellipses
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protected override void OnPaint(PaintEventArgs e) { // Obtain the Graphics object Graphics g = eGraphics; // Set the smoothing mode of the surface gSmoothingMode = SmoothingModeAntiAlias; // Create a rectangle with height 100 and width 100 Rectangle rect = new Rectangle(20, 20, 100, 100); // Create two Pen objects, one red and one black Pen redPen = new Pen(ColorRed, 3); Pen blackPen = PensBlack;
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// Create a SolidBrush object SolidBrush greenBrush = new SolidBrush(ColorGreen); // Draw shapes and lines gDrawRectangle(redPen, rect); gFillEllipse(greenBrush, rect); gDrawLine(blackPen, 0, 250, thisWidth, 250); gFillEllipse(BrushesBlue, 70, 220, 30, 30); gFillEllipse(BrushesSkyBlue, 100, 210, 40, 40); gFillEllipse(BrushesGreen, 140, 200, 50, 50); gFillEllipse(BrushesYellow, 190, 190, 60, 60); gFillEllipse(BrushesViolet, 250, 180, 70, 70); gFillEllipse(BrushesRed, 320, 170, 80, 80); }
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