testXYPolygonTurningDirections MethodStatic

Test the direction of turn at the vertices of the polygon, ignoring z-coordinates.

• For a polygon without self-intersections and successive colinear edges, this is a convexity and orientation test: all positive is convex and counterclockwise, all negative is convex and clockwise.
• Beware that a polygon which turns through more than a full turn can cross itself and close, but is not convex.

testXYPolygonTurningDirections(points: Point3d[] | Point2d[]): number

@returns 1 if all turns are to the left, -1 if all to the right, and 0 if there are any zero or reverse turns

Returns - number

1 if all turns are to the left, -1 if all to the right, and 0 if there are any zero or reverse turns

Defined in

• geometry3d/PolygonOps.ts Line 712