Category Archives: drawing

Make a shaded ellipse control in C#

Note: Before you can use the ShadedEllipse control in the example program, you must build the solution. After you download the example, build it before you try to view the form. This example walks through building a control that draws … Continue reading

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Use digits of Pi to draw a picture in C#

The article 10 stunning images show the beauty hidden in pi shows several ways to use Pi to generate pictures. This example demonstrates one of them. The program starts drawing at the origin (0, 0). It then scans through the … Continue reading

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Draw, move, and delete line segments in VB.NET

This progra lets you draw, move, and delete line segments from a drawing. It’s a Visual Basic .NET version of the example Draw, move, and delete line segments in C# made by request. Click and drag to draw line segments. … Continue reading

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Convert a Rectangle into a RectangleF and vice versa in C#

The RectangleF structure has an overloaded assignment operator = that lets you simply set a RectangleF equal to a Rectangle, so converting a Rectangle into a RectangleF is easy. That makes sense because converting from Rectangle to RectangleF is a … Continue reading

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Draw a golden spiral in C#

This example shows how to draw a golden spiral (or phi spiral) in C#. The example Draw a nested series of golden rectangles in C# draws nested rectangles and connects their corners to make a square “spiral.” This example makes … Continue reading

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Draw a nested series of golden rectangles in C#

This program draws golden rectangles, rectangles whose side ratio is equal to φ. For information on φ, see Examine the relationship between the Fibonacci sequence and phi in C#. The program first draws a golden rectangle. It then removes the … Continue reading

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Examine the relationship between the Fibonacci sequence and phi in C#

The golden ratio (also called the golden mean, golden section, or divine proportion) is a number that pops up in a surprising number of places in geometry and nature. This number is also called φ (phi, pronounced either “fee” or … Continue reading

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Draw a smiley face with WPF in C#

Often I need to use images for demonstration purposes or for a book, and a smiley face makes a neutral, pleasant image. This example shows how to draw a smiley face with XAML and WPF, and then save an image … Continue reading

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Use base insets with custom end caps in C#

The example Draw lines with custom end caps in C# shows how to draw lines with custom end caps. For example, using those techniques you can draw lines with arrowheads or circles at the ends. The coordinate system for drawing … Continue reading

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Apply a color threshold to an image in C#

The example Provide gamma correction for an image in C# uses the ImageAttribute object’s SetGamma method to gamma correct an image. This example uses the SetThreshold method to apply a color threshold to an image. The SetThreshold method takes as … Continue reading

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