Re: 2D vector code

[Jan Nieuwenhuizen]

David Feuer writes:

> My SVG polygon code uses 2D vectors ( (x,y) pairs ) a good bit.  Does
> LilyPond already have basic functions (addition, subtraction,
> multiplication by a scalar, dot product, cross product, ...) for
> vectors I can use?

In C++ we have Offset, which has a number of complex_* functions.  We
also have complex-to-offset and use offset pairs in SCM, but I do not
know if we have any such functions in SCM.

> If not, I think I should probably write them as a separate module.

Does scm/guile not have such funtions for pairs/complex vectors?

> If I write them as a separate module, should vectors be pairs
> (convenient), or should they be SRFI 9 records (pretty)?

Jan.

-- 
Jan Nieuwenhuizen <address@hidden> | GNU LilyPond - The music typesetter
http://www.xs4all.nl/~jantien       | http://www.lilypond.org