# hextess

##### Hexagonal Grid or Tessellation

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.

##### 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`

.

##### Value

The value of `hexgrid`

is a point pattern (object of class
`"ppp"`

).

The value of `hextess`

is a tessellation (object of class `"tess"`

).

##### See Also

##### Examples

```
# NOT RUN {
if(interactive()) {
W <- Window(chorley)
s <- 0.7
} else {
W <- letterR
s <- 0.3
}
plot(hextess(W, s))
plot(hexgrid(W, s), add=TRUE)
# }
```

*Documentation reproduced from package spatstat, version 1.56-1, License: GPL (>= 2)*