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 |
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 K
of the boundary pixels.
The result is TRUE if every boundary pixel lies within
one pixel diameter of an edge of K
.
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
[Package spatstat.geom version 3.3-2 Index]