Tag Archives: example program

Draw many circles that intersect two points in C#

Posted on June 27, 2020 by RodStephens

As I mentioned in my earlier post Connect two points with elliptical arcs in C#, an infinite number of circles (or ellipses) can pass through two points. This example draws some of them to produce an interesting pattern. This example … Continue reading →

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Connect two points with elliptical arcs in C#

Posted on June 22, 2020 by RodStephens

As I mentioned in my earlier post Connect two points with arcs of midpoint circles in C#, two points alone cannot uniquely define a circle. An infinite number of circles (or ellipses) can pass through two points and therefore they … Continue reading →

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Connect two points with arcs of midpoint circles in C#

Posted on June 20, 2020 by RodStephens

Two points alone cannot uniquely define a circle because an infinite number of circles can pass through two points and therefore they can be connected by an infinite number of arcs. If you add extra information, however, two points can … Continue reading →

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Improve the program that displays COVID-19 data for US states in C#

Posted on June 18, 2020 by RodStephens

This post describes two improvements to the earlier example that displays COVID-19 data for US states. The first change is a basic software engineering improvement. The second displays daily changes in COVID-19 case, hospitalization, and death numbers. Software Engineering Notes … Continue reading →

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Use VBA to make a Gantt chart showing work schedules

Posted on June 13, 2020 by RodStephens

This example shows how to use VBA (Visual Basic for Applications) in an Excel workbook to draw a Gantt chart showing when employees are scheduled to work. This isn’t C# programming, but you may find it useful. (And I don’t … Continue reading →

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Create a Contain FillMode for filling polygons in C#

Posted on June 9, 2020 by RodStephens

The example Understand fill modes in C# showed how the Alternate and Winding FillMode values affect the result when you fill a self-intersecting polygon. In many cases, the Alternate FillMode leaves holes in a self-intersecting polygon while the Winding FillMode … Continue reading →

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Find the angle between two vectors in C#

Posted on June 5, 2020 by RodStephens

This example shows how you can find the angle between two vectors. The program has three main parts: selecting the points that define the vectors, drawing the vectors, and calculating the angle between them. The last task is the most … Continue reading →

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Crop scaled images to specific sizes in C#

Posted on June 1, 2020 by RodStephens

This example lets you crop scaled images to specific sizes in C#. The post Crop images to specific sizes in C# lets you drag a rectangle of a specified size around on an image to pick the part of the … Continue reading →

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Create a schedule for a round robin tournament with home teams in C#

Posted on May 31, 2020 by RodStephens

My book Essential Algorithms, Second Edition describes an algorithm for creating a round robin schedule in detail. The following posts also explain how you can create a round robin schedule in slightly less detail. Generate a schedule for a round … Continue reading →

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Understand fill modes in C#

Posted on May 25, 2020 by RodStephens

C# drawing routines have two fill modes. In Windows Forms they are called Alternate and Winding. In WPF they are called Odd/Even and Non-Zero. This example lets you draw polygons and see how the two fill modes determine which points … Continue reading →

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