From kohnicho@comp.nus.edu.sg  Tue Aug 15 04:16:03 2000
From: kohnicho@comp.nus.edu.sg (Nicholas Lewin-Koh)
Date: Tue, 15 Aug 2000 11:16:03 +0800 (GMT-8)
Subject: [Rd] package (in development)
Message-ID: <Pine.GSO.4.21.0008151102090.2401-100000@sununx.comp.nus.edu.sg>

Hi,
I have submitted the package maptools (the file is maptools-0.1a.zip). The
archive contains the source ready to compile. I have tested everything on
windows 98 and NT and haven't found any major bugs (yet). It should work 
on lin/unix as well but I don't have easy access to a machine to test
it. 

Of interest might be the functions dbf.read and dbf.write.
Also there is a function to read ESRI shapefiles, which is stored as a map
object. I am still developing the map object, at the moment it is far too
bulky, and I think i could make it a lot more elegant using
attributes. Suggestions would be very very welcome. I am planing to
implement quadtree indexing, so that map objects can be used for spatial
statistics (range searching for building connectivity matrices). One thing
I noticed is that the polygon function cannot handle wierd cases such as
holes, I can work on that if no one else is.

Lastly there is ca color ramp function. I am planning to implement a more
sophisticated one with interpolation in the color cube between break
points. Is there a way to get the rgb values for all the colors listed
when colors() is typed?

 

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[Rd] package (in development)
Nicholas Lewin-Koh