Approximate a Polygon by a Simpler Polygon
Given a polygonal window, this function finds a simpler polygon that approximates it.
simplify.owin(W, dmin)
W |
The polygon which is to be simplied.
An object of class |
dmin |
Numeric value. The smallest permissible length of an edge. |
This function simplifies a polygon W
by recursively deleting the shortest edge of W
until all remaining edges are longer than the specified
minimum length dmin, or until there are only three edges left.
The argument W must be a window (object of class
"owin"). It should be of type "polygonal".
If W is a rectangle, it is returned without alteration.
The simplification algorithm is not yet implemented for
binary masks. If W is a mask, an error is generated.
Another window (object of class "owin")
of type "polygonal".
Adrian Baddeley Adrian.Baddeley@curtin.edu.au, Rolf Turner r.turner@auckland.ac.nz and Ege Rubak rubak@math.aau.dk.
plot(letterR, col="red") plot(simplify.owin(letterR, 0.3), col="blue", add=TRUE) W <- Window(chorley) plot(W) WS <- simplify.owin(W, 2) plot(WS, add=TRUE, border="green") points(vertices(WS))
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