spatstat (version 1.21-2)

vertices: Vertices of a Window

Description

Finds the vertices of a window

Usage

vertices(w)

Arguments

w
A window.

Value

  • A list with components x and y giving the coordinates of the vertices.

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.

See Also

owin.object.

Examples

Run this code
data(letterR)
  vert <- vertices(letterR)

  plot(letterR, main="Polygonal vertices")
  points(vert)
  plot(letterR, main="Boundary pixels")
  points(vertices(as.mask(letterR)))

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