Computes the distances from each point of a point pattern to the boundary of the window.
A point pattern (object of class
This function computes, for each point x[i]
in the point pattern
X, the shortest distance
dist(x[i], W') from x[i]
to the boundary of the window W of observation.
If the window
Window(X) is of type
"polygonal", then these distances are computed by
analytic geometry and are exact, up to rounding errors.
If the window is of type
"mask" then the distances
are computed using the real-valued distance transform,
which is an approximation with maximum error equal to the width
of one pixel in the mask.
A numeric vector, giving the distances from each point of the pattern to the boundary of the window.
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