Figure 35 An ellipse in .NET

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Figure 35 An ellipse
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To draw an ellipse, you need to specify the outer rectangle GDI+ takes care of the rest DrawEllipse draws an ellipse defined by a rectangle specified by a pair of coordinates, a height, and a width (an ellipse with equal height and width is a circle) DrawEllipse has four overloaded methods: 1 2 3 4 public void DrawEllipse(Pen, Rectangle); public void DrawEllipse(Pen, RectangleF); public void DrawEllipse(Pen, int, int, int, int); public void DrawEllipse(Pen, float, float, float, float);
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To draw an ellipse, an application creates a pen and four coordinates (or a rectangle), and then calls DrawEllipse Listing 35 draws ellipses with different options
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Listing 35 Drawing ellipses
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private void Form1_Paint(object sender, SystemWindowsFormsPaintEventArgs e) { // Create pens Pen redPen = new Pen(ColorRed, 6 ); Pen bluePen = new Pen(ColorBlue, 4 ); Pen greenPen = new Pen(ColorGreen, 2); // Create a rectangle Rectangle rect = new Rectangle(80, 80, 50, 50); // Draw ellipses eGraphicsDrawEllipse(greenPen, 1000F, 1000F, 100F, 100F ); eGraphicsDrawEllipse(redPen, rect ); eGraphicsDrawEllipse(bluePen, 60, 60, 90, 90); eGraphicsDrawEllipse(greenPen, 400F, 400F, 1300F, 1300F ); // Dispose of objects redPenDispose(); greenPenDispose(); bluePenDispose(); } Figure 36 shows the output from Listing 35
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Figure 36 Drawing ellipses
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3215 Drawing Text
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This section briefly discusses the drawing of text 5 covers this topic in more detail The DrawString method draws a text string on a graphics surface It has many overloaded forms DrawString takes arguments that identify the text, font, brush, starting location, and string format The simplest form of DrawString looks like this:
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public void DrawString(string, Font, Brush, PointF); where string is the text that you want to draw,Font and Brush are the font and brushes used to draw the text, and PointF is the starting point of the text Listing 36 uses the DrawString method to draw "Hello GDI+ World!" on a form
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Listing 36 Drawing text
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private void Form1_Paint(object sender, SystemWindowsFormsPaintEventArgs e) { eGraphicsDrawString("Hello GDI+ World!", new Font("Verdana", 16), new SolidBrush(ColorRed), new Point(20, 20)); }
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Note
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You might notice in Listing 36 that we create Font, SolidBrush, and Point objects directly as parameters of theDrawString method This method of creating objects means that we can't dispose of these objects, so some cleanup is left for the garbage collector
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Figure 37 shows the output from Listing 36
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Figure 37 Drawing text
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The DrawString method has several overloaded forms, as shown here:
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public void DrawString(string, Font, Brush, RectangleF); public void DrawString(string, Font, Brush, PointF, StringFormat); public void DrawString(string, Font, Brush, RectangleF, StringFormat); public void DrawString(string, Font, Brush, float, float); public void DrawString(string, Font, Brush, float, float, StringFormat);
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Now let's see another example of drawing text this time using the StringFormat class, which defines the text format UsingStringFormat, you can set flags, alignment, trimming, and other options for the text ( 5 discusses this functionality in more detail)Listing 37 shows different ways to draw text on a graphics surface In this example the FormatFlags property is set to StringFormatFlagsDirectionVertical, which draws vertical text
Listing 37 Using DrawString to draw text on a graphics surface
private void Form1_Paint(object sender, SystemWindowsFormsPaintEventArgs e) { // Create brushes SolidBrush blueBrush = new SolidBrush(ColorBlue); SolidBrush redBrush = new SolidBrush(ColorRed);
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SolidBrush greenBrush = new SolidBrush(ColorGreen); // Create a rectangle Rectangle rect = new Rectangle(20, 20, 200, 100); // The text to be drawn String drawString = "Hello GDI+ World!"; // Create a Font object Font drawFont = new Font("Verdana", 14); float x = 1000F; float y = 1000F; // String format StringFormat drawFormat = new StringFormat(); // Set string format flag to direction vertical, // which draws text vertically drawFormatFormatFlags = StringFormatFlagsDirectionVertical; // Draw string eGraphicsDrawString("Drawing text", new Font("Tahoma", 14), greenBrush, rect); eGraphicsDrawString(drawString, new Font("Arial", 12), redBrush, 120, 140); eGraphicsDrawString(drawString, drawFont, blueBrush, x, y, drawFormat); // Dispose of objects blueBrushDispose(); redBrushDispose(); greenBrushDispose(); drawFontDispose(); } Figure 38 shows the output from Listing 37