Construct a hexagonal grid of points,
or a hexagonal tessellation.
Usage
hexgrid(W, s, offset = c(0, 0), origin=NULL, trim = TRUE)
hextess(W, s, offset = c(0, 0), origin=NULL, trim = TRUE)
Arguments
W
Window in which to construct the hexagonal grid or tessellation.
An object of class "owin".
s
Side length of hexagons. A positive number.
offset
Numeric vector of length 2 specifying a shift of the
hexagonal grid. See Details.
origin
Numeric vector of length 2 specifying the initial origin
of the hexagonal grid, before the offset is applied.
See Details.
trim
Logical value indicating whether to restrict the result to
the window W. See Details.
Value
The value of hexgrid is a point pattern (object of class
"ppp").The value of hextess is a tessellation (object of class "tess").
Details
hexgrid constructs a hexagonal grid of points
on the window W. If trim=TRUE (the default),
the grid is intersected with W so that all points lie
inside W. If trim=FALSE, then we retain all grid points
which are the centres of hexagons that intersect W.
hextess constructs a tessellation of hexagons
on the window W. If trim=TRUE (the default),
the tessellation is restricted to the interior of W,
so that there will be some fragmentary hexagons near the
boundary of W. If trim=FALSE, the tessellation
consists of all hexagons which intersect W.
The points of hexgrid(...) are the
centres of the tiles of hextess(...)
in the same order.
In the initial position of the grid or tessellation,
one of the grid points (tile centres) is placed at the
origin, which defaults to the midpoint of the
bounding rectangle of W. The grid can be shifted
relative to this origin by specifing the offset.