Vertices of a Window
Finds the vertices of a window, or similar object.
vertices(w) ## S3 method for class 'owin' vertices(w)
w |
A window (object of class |
This function computes the vertices (‘corners’) of a spatial window or other object.
For vertices.owin,
the argument w should be a window (an object of class
"owin", see owin.object for details).
If w is a rectangle, the coordinates of the
four corner points are returned.
If w is a polygonal window (consisting of one or more
polygons), the coordinates of the vertices of all polygons are
returned.
If w is a binary mask, then a ‘boundary pixel’ is defined to be
a pixel inside the window
which has at least one neighbour outside the window. The coordinates
of the centres of all boundary pixels are returned.
A list with components x and y giving the coordinates
of the vertices.
Adrian Baddeley Adrian.Baddeley@curtin.edu.au
and Rolf Turner r.turner@auckland.ac.nz
vert <- vertices(letterR) plot(letterR, main="Polygonal vertices") points(vert) plot(letterR, main="Boundary pixels") points(vertices(as.mask(letterR)))
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