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finding cluster boundary [message #79248]

Wed, 08 February 2012 13:41

biophys
Messages: 68
Registered: July 2004

Member

Hi, Folks

I've got a collection of 2D points that have already been identified
as a cluster. Is there a quick way to extract the boundary points of
the cluster? I understand the easiest way is to use TRIANGULATE
procedure to get the boundary points in counterclockwise order.
However, the points returned are like a convex envelope of the cluster
which does not represent the real shape of the cluster. It looks like
that I might need to specify that the edge of the boundary polygon can
not be larger than a certain length. Any suggestions?

Thanks a lot,
BP
--
TRIANGULATE, X, Y, Triangles, B
plot, X, Y, psym=1, color=color
plots, X[B], Y[B], color=color
plots, X[B[0]], Y[B[0]], color=color, /continue

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