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Subject: |
Re: [Devel] 'tension' in splines, Hermite Splines |
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Fri, 13 Sep 2002 16:08:51 -0700 |
Hi Werner,
I've just unsubscribed from devel (because I'll be in Madagascar for a
month) and ran across the following as I was studying Ikarus formats. Could
you forward it to devel if you deem it interesting? Thanks.
At 08:38 PM 9/11/2002 +0400, Vadim wrote:
IkarusM displays all "on-curve" points, treating the curves
as Hermite splines, which it converts to Beziers when making Type1 or
According to Peter Karow's book "Digital Formats for Typefaces" page 109
(describing how Ikarus interpolates between two curve points):
We do not take the spline function to display the closed curve but
rather, between any two digitized points, we determine two segments
of circles.
ie. not hermite splines. A more complete description of this circular
interpolation (along with code) is given in Appendix W of that book, pages
357-374.
This is the book URW++ referred me to (last month) when I asked them about
Ikarus's font format, so I presume it is as accurate as anything available.
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