Create an elliptical window.
The half-lengths of the axes of the ellipse.
The centre of the ellipse.
The (anti-clockwise) angle through which the ellipse should be
rotated (about its centre) starting from an orientation in which
the axis of half-length
Logical value controlling the type of approximation to a perfect ellipse. See Details.
Arguments passed to
The number of edges in the polygonal approximation to the ellipse.
This command creates a window object representing an ellipse with the given centre and axes.
By default, the ellipse is
approximated by a polygon with
mask=TRUE, then the ellipse is approximated by a binary pixel
mask. The resolution of the mask is controlled by
... which are passed to
b must be single positive numbers.
centre specifies the ellipse centre: it can be either
a numeric vector of length 2 giving the coordinates,
list(x,y) giving the coordinates of exactly one point, or a
point pattern (object of class
"ppp") containing exactly one point.
An object of class
owin (either of type “polygonal”
or of type “mask”) specifying an elliptical window.
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