Computes the distances
from each pixel in a window to the boundary of the window.

Usage

bdist.pixels(w, ..., coords=TRUE)

Arguments

w

A window (object of class "owin").

...

Arguments passed to as.mask to determine
the pixel resolution.

coords

Logical: if TRUE, the result can be
displayed using persp, contour etc.

Value

If coords is false,
a matrix giving the distances from each pixel in the image raster
to the boundary of the window. Rows of this matrix correspond to
the $y$ coordinate and columns to the $x$ coordinate.
If coords is true, a list with three components
x,y,z, where x,y are vectors of length $m,n$
giving the $x$ and $y$ coordinates respectively,
and z is an $m \times n$ matrix such that
z[i,j] is the distance from (x[i],y[j]) to the
boundary of the window. Rows of this matrix correspond to the
$x$ coordinate and columns to the $y$ coordinate.
This result can be plotted with persp, image
or contour.

Details

This function computes, for each pixel $u$
in the window w, the shortest distance
$d(u, W^c)$ from $u$
to the boundary of $W$.

If the window is not of type "mask" then it is first
converted to that type. The arguments "..." are
passed to as.mask to determine the pixel resolution.