Rotates a window

```
# S3 method for owin
rotate(X, angle=pi/2, …, rescue=TRUE, centre=NULL)
```

X

A window (object of class `"owin"`

).

angle

Angle of rotation.

rescue

Logical. If `TRUE`

, the rotated window
will be processed by `rescue.rectangle`

.

…

Optional arguments passed to `as.mask`

controlling the resolution of the rotated window, if `X`

is a
binary pixel mask. Ignored if `X`

is not a binary mask.

centre

Centre of rotation.
Either a vector of length 2, or a character string
(partially matched to `"centroid"`

, `"midpoint"`

or `"bottomleft"`

).
The default is the coordinate origin `c(0,0)`

.

Another object of class `"owin"`

representing the
rotated window.

Rotates the window by the specified angle. Angles are measured in
radians, anticlockwise. The default is to rotate the window 90 degrees
anticlockwise. The centre of rotation is the origin, by default,
unless `centre`

is specified.

# NOT RUN { w <- owin(c(0,1),c(0,1)) v <- rotate(w, pi/3) e <- rotate(w, pi/2, centre="midpoint") # plot(v) w <- as.mask(letterR) v <- rotate(w, pi/5) # }