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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 p_k are explicit coordinates and i_k 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:

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