# vertices

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##### Vertices of a Window

Finds the vertices of a window

Keywords
spatial, math
##### Usage
vertices(w)
w
A window.
##### Details

This function computes the vertices (corners') of a spatial window.

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 and y giving the coordinates of the vertices.

owin.object.

• vertices
##### Examples
data(letterR)
vert <- vertices(letterR)

plot(letterR, main="Polygonal vertices")
points(vert)
plot(letterR, main="Boundary pixels")
points(vertices(as.mask(letterR)))
Documentation reproduced from package spatstat, version 1.37-0, License: GPL (>= 2)

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