vertices
From spatstat v1.41-1
by Adrian Baddeley
Vertices of a Window
Finds the vertices of a window, or similar object.
Usage
vertices(w) ## S3 method for class 'owin':
vertices(w)
Arguments
- w
- A window (object of class
"owin"
) or similar object.
Details
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.
Value
- A list with components
x
andy
giving the coordinates of the vertices.
See Also
Examples
data(letterR)
vert <- vertices(letterR)
plot(letterR, main="Polygonal vertices")
points(vert)
plot(letterR, main="Boundary pixels")
points(vertices(as.mask(letterR)))
Community examples
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