Determine whether a polygon is oriented clockwise or counterclockwise in C#

Posted on July 29, 2014 by Rod Stephens

Polygon orientation

The post Calculate the area of a polygon in C# explains how to calculate the “signed area” of a polygon. That Polygon class’s SignedPolygonArea method returns a positive area if the polygon is oriented clockwise and a negative area if it is oriented counterclockwise.

The following PolygonIsOrientedClockwise method uses SignedPolygonArea method to determine whether a polygon is oriented clockwise.

// Return true if the polygon is oriented clockwise.
public bool PolygonIsOrientedClockwise()
{
    return (SignedPolygonArea() < 0);
}

See the previous post for information about how the SignedPolygonArea method works.


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7 Responses to Determine whether a polygon is oriented clockwise or counterclockwise in C#

  1. kerUttermasit says:
    July 6, 2011 at 11:12 am

    Complex Post. This post helped me in my college assignment. Thnaks Alot

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  7. Lee Glosser says:
    October 3, 2017 at 4:45 am

    Thank you very much.

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