Re: [Lib2geom-devel] some todos and wishes

[njh <nj...@nj...>]

On Sat, 14 Apr 2007, mgsloan wrote:

>> 
>> > Sounds good!  Yeah, one thing that might be nice would be an algorithm
>> to
>> > find combinable, adjacent segments, and do combine them.  Hopefully it
>> can
>> > be written in such a way that it works for both 1d and 2d (eg, write 1d
>> > accuracy and combination algos, then do a 1d and 2d optimizer).
>> 
>> Compute the all the left and right derivative on the edge and if they are
>> sufficiently equal, the curves are sufficiently equal.
>
>
> That's what I thought at first, however, I'm not sure how that interacts
> with combining sbasis.  This would mean that any C0, C1 pw could be a single
> sbasis.  This may indeed be possible, however, we will need to do some cost
> weighing in the function - a combination isn't valuable if it produces a
> large coefficient count while reducing precision.

Sorry, I managed to leave an 's' off:
  Compute the all the left and right derivatives on the edge and if they
  are sufficiently equal, the curves are sufficiently equal.

> The nice thing about having a periodic class like this is that you can
> control what can be done with periodics - you can't perform an operation on
> two periodics (might have nearly irrational period ratios), you can't cast
> periodics to anything else.  All it can do is render itself useful to
> something finite.  There are still problems though.  Lets say, pw +
> periodic.  Outside the pw's intended domain, the periodicity will dissapear.

Whereas lazy pws are always mergable.

sounds good.
njh