OuterPolygon

OuterPolygon[poly]

gives the outer polygon of the polygon poly.

Details

OuterPolygon is also known as polygon outer ring.
Typically used to decompose a polygon as a difference of simple polygons, even when the original construction of the polygon was using crossing curves etc.
OuterPolygon is defined by the canonicalization performed in CanonicalizePolygon.

OuterPolygon gives a polygon of the form Polygon[{p₁,p₂,…},{{i₁,i₂,…},…}], where p_k are explicit coordinates, and i_k are integer indexes referring to coordinates in the list {p₁,p₂,…}.
In general, the result will be a Polygon object representing a disjoint union of simple polygons.

Examples

open allclose all

Basic Examples (1)

Get the outer polygon from a Polygon:

Scope (6)

OuterPolygon works on polygons:

Triangle:

Rectangle:

OuterPolygon works on polygons of geographic entities:

Polygons with GeoPosition:

Polygons with GeoGridPosition:

Polygon with holes:

Polygons with disconnected components:

Polygons in :

Properties & Relations (2)

OuterPolygon of a simple polygon is the polygon itself:

A simple polygon has the same polygon coordinates as its OuterPolygon:

Top

Enable JavaScript to interact with content and submit forms on Wolfram websites. Learn how