On 07 Feb 2003, Zhang Linbo wrote:
>
> I have also noticed a possible bug in the calculations when
> exporting an EPS file. Please see attached diagram which
> generates floating point exceptions when exporting to the
> EPS format ('nan' numbers in the EPS file).
I see it. It happens whenever one of the arcs disappear in the diagram.
Now why would they disappear? Looks like beta becomes nan in some cases in
objects/SADT/arrow.c:sadtarrow_draw(). It's swapped in from alpha, which
is nan because vca.x/ca is > 1.0. But vca.x = A.x - C.x, while ca =
distance_point_point(A, C). Looks like the sqrt in distance_point_point
makes a slight rounding error. I'm just punting on it now, clamping cosa &
cosb to [-1.0, 1.0].
-Lars
--
Lars Clausen (http://shasta.cs.uiuc.edu/~lrclause)| H�rdgrim of Numenor
"I do not agree with a word that you say, but I |----------------------------
will defend to the death your right to say it." | Where are we going, and
--Evelyn Beatrice Hall paraphrasing Voltaire | what's with the handbasket?
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