is.convex {spatstat.geom}R Documentation

Test Whether a Window is Convex

Description

Determines whether a window is convex.

Usage

  is.convex(x)

Arguments

x

Window (object of class "owin").

Details

If x is a rectangle, the result is TRUE.

If x is polygonal, the result is TRUE if x consists of a single polygon and this polygon is equal to the minimal convex hull of its vertices computed by chull.

If x is a mask, the algorithm first extracts all boundary pixels of x using vertices. Then it computes the (polygonal) convex hull KK of the boundary pixels. The result is TRUE if every boundary pixel lies within one pixel diameter of an edge of KK.

Value

Logical value, equal to TRUE if x is convex.

Author(s)

Adrian Baddeley Adrian.Baddeley@curtin.edu.au

and Rolf Turner rolfturner@posteo.net

See Also

owin, convexhull.xy, vertices


[Package spatstat.geom version 3.3-2 Index]