Tag Archives: algorithms

Enlarge a polygon that has colinear vertices in C#

Posted on December 1, 2020 by RodStephens

The example Enlarge a polygon in C# shows how you can expand a polygon. The basic idea is to offset each of the polygon’s edges away from the polygon’s center and then see where adjacent edges intersect as shown in … Continue reading →

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Overlay parts of images in C#

Posted on September 8, 2020 by RodStephens

My previous post Brighten pixels in an image in C# lets you brighten certain pixels in an image. Unfortunately is often brightens pixels outside of the area that you want to modify. For example, in the left side of the … Continue reading →

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Brighten pixels in an image in C#

Posted on September 7, 2020 by RodStephens

Sometimes when I take a picture, the poor lighting makes some pixels come out less brightly than I would like. For example, in the picture on the right the red raspberries aren’t very red. This example lets you brighten pixels. … Continue reading →

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Perform binary contrast enhancement more quickly in C#

Posted on September 5, 2020 by RodStephens

The example Perform binary contrast enhancement interactively in C# lets you convert an image into completely black and white pixels depending on their brightness. Pixels that are brighter than a given cutoff value are converted into white. Those that are … Continue reading →

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Make a blended composite image in C#

Posted on August 27, 2020 by RodStephens

The other day I wanted to do something that all of us do from time to time: make a composite image with the Eye of Sauron on top of another picture. This turned out to be a bit more complicated … Continue reading →

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Pingback: Code Project post “Clipping Plane in WPF 3D”

Posted on July 12, 2020 by RodStephens

The Code Project post Clipping Plane in WPF 3D by charles922 references a couple of my WPF 3D posts. His post explains several WPF 3D concepts including; Manger sponges (refers to my post Use a dictionary to draw a 3D … Continue reading →

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Sprialize an image in C#

Posted on July 10, 2020 by RodStephens

This example shows how to spiralize an image. By spiralize I mean shade pieces of the picture with different colors so the colored areas for a spiral as shown in the picture. This could be a difficult problem. Fortunately I’ve … Continue reading →

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Fill a target area found by trilateration in C#

Posted on July 6, 2020 by RodStephens

The post Perform trilateration in C# explains how a C# program can use trilateration to find an area where a target point lies. This post explains how you can draw that area. The Target Area The target area found by … Continue reading →

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Perform trilateration in C#

Posted on July 3, 2020 by RodStephens

This post explains how a C# program can use trilateration to locate a point that is known distances from three other points. Trilateration is somewhat similar to triangulation, so following two sections begin by explaining what triangulation and trilateration are. … Continue reading →

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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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