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Re: Line index [message #5957]

Fri, 22 March 1996 00:00

David Foster
Messages: 341
Registered: January 1996

Senior Member

pit@asterix.kis.uni-freiburg.de (Peter Suetterlin) wrote:
>
> In article <31499FB9.2F6D@dlr.de>,
> Hermann Mannstein <H.Mannstein@dlr.de> writes:
>
>> is there a robust function which returns the indices within an image
>> (like the where function) belonging to a line defined by two or more
>> points.
>
> for shure there is, even built-in IDL:
> Index=polyfillv(xx,yy,xsize,ysize)
> Read the manpage for further reference.
>

According to the "manpage", POLLYFILLV() expects at least 3
points so it would never work for a simple line. Also, it
connects each successive line and the first with the last,
to make a polygon, and then returns the indices of the
points within this polygon.

You wouldn't be getting the indices of the points on the line(s),
but of the points within the polygon defined by the points.

Dave Foster
foster@bial1.ucsd.edu

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[Message index]

		Re: Line index By: David Foster on Fri, 22 March 1996 00:00
		Re: Line index By: David Foster on Fri, 22 March 1996 00:00
		Re: Line index By: pit on Fri, 15 March 1996 00:00

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