InnerPolygon

InnerPolygon[poly]

gives the inner polygon of the polygon poly.

Details

  • InnerPolygon is also known as inner ring or hole.
  • 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.
  • InnerPolygon is defined by the canonicalization performed in CanonicalizePolygon.
  • InnerPolygon gives a polygon of the form Polygon[{p1,p2,}, {{i1,i2,},}], where pk are explicit coordinates and ik are integer indexes referring to coordinates in the list {p1,p2,}.
  • If poly is a polygon without a hole, then the result is an EmptyRegion object.

Examples

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Basic Examples  (1)

Get the inner polygon of a Polygon:

Scope  (6)

InnerPolygon works on polygons:

Triangle:

Rectangle:

InnerPolygon works on polygons with GeoPosition:

Polygons with GeoGridPosition:

Polygon with holes:

Polygons with disconnected components:

Polygons in :

Properties & Relations  (1)

InnerPolygon of a simple polygon is an empty polygon:

Introduced in 2019
 (12.0)