>I looked through all your links, and while Akima splines seem
>interesting, I think we would need some visual demonstration of their
>performance in the way they'd be used in GIMP (most likely, contour
>tracing to 'cut out' objects), before we could agree that they were an
>appropriate thing to add. We would also need to be absolutely sure
>that they are unencumbered by patents.
>
>Personally, I think if we were to support a 'on-points-only' type of
>spline, Cornu (aka clothoid) splines would be a better choice,
>especially as they are already implemented in Inkscape and FontForge,
>and a free software affiliated person (Raph Levien) owns the patent
>(pending?) on it and has implemented a GPL library (libspiro) to
>assist in their usage. They also seem to be more predictable than
>Akima splines. However they do require you to mark corners explicitly.
http://www.cse.unsw.edu.au/~lambert/splines/
shows the different splines in action. akima is not specifically identified, but related cubic interpolation splines are done using java graphics.
Cool. Whatever works best. I just want to be able to lay points down and have the curve follow thru the points. I looked at http://sourceforge.net/projects/libspiro/ which is a clothoid and I was impressed with the image, much more so than with akima, which is really troubled around corners (maybe all cubic splines are like that, I don't know). And the clothoid can be converted to bezier.
>Please send only plain-text mail to this list. HTML mail annoys people here.
sorry, my primary email is html (yahoo) email. yahoo mail has no options to send as text (no yahoo there).
>interesting, I think we would need some visual demonstration of their
>performance in the way they'd be used in GIMP (most likely, contour
>tracing to 'cut out' objects), before we could agree that they were an
>appropriate thing to add. We would also need to be absolutely sure
>that they are unencumbered by patents.
>
>Personally, I think if we were to support a 'on-points-only' type of
>spline, Cornu (aka clothoid) splines would be a better choice,
>especially as they are already implemented in Inkscape and FontForge,
>and a free software affiliated person (Raph Levien) owns the patent
>(pending?) on it and has implemented a GPL library (libspiro) to
>assist in their usage. They also seem to be more predictable than
>Akima splines. However they do require you to mark corners explicitly.
http://www.cse.unsw.edu.au/~lambert/splines/
shows the different splines in action. akima is not specifically identified, but related cubic interpolation splines are done using java graphics.
Cool. Whatever works best. I just want to be able to lay points down and have the curve follow thru the points. I looked at http://sourceforge.net/projects/libspiro/ which is a clothoid and I was impressed with the image, much more so than with akima, which is really troubled around corners (maybe all cubic splines are like that, I don't know). And the clothoid can be converted to bezier.
>Please send only plain-text mail to this list. HTML mail annoys people here.
sorry, my primary email is html (yahoo) email. yahoo mail has no options to send as text (no yahoo there).
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