Re: How to get X/Y-extent of a bezier-curve?

[Thomas Morley]

2015-10-07 14:08 GMT+02:00 Thomas Morley <address@hidden>:

> The code in my initial mail uses coord-rotate (not
> ly:stencil-rotate-absolute as in Jans suggestion)
> What do you think about this method?
>
> Ofcourse it was heavily simplified, maybe best to put up a patch to
> have the full code for more detailed discussion.

I have to postpone uploading the patch, there are some glitches ...

And one thing which has driven me crazy, before I found the culprit:
`coord-rotate' has a problem which can be demonstrated with:

(display (coord-rotate '(10 . 0) (/ PI 2)))

Expected:   (0 . 10)
Actually:  (6.12323399573677e-16 . 10.0)

What's the best method to get the zero?
Using simple `round' will not work, because I don't want to get
integers for other fractions of PI.
And I don't know how to identify such a value.

Simply ignoring looks not like an option, I had examples where
rounding errors cumulated up to visible changes in the final pdf.


Cheers,
  Harm