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

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.