[metapost] Trying to figure out MPLib

luigi scarso luigi.scarso at gmail.com
Sun Aug 5 15:23:53 CEST 2012

On Sat, Aug 4, 2012 at 5:01 PM, Taco Hoekwater <taco at elvenkind.com> wrote:

> Hi,
> Really quickly (and perhaps not very precise):
> On 08/04/2012 04:16 PM, Shriramana Sharma wrote:
>>  ....But I wonder:
>> psout.w (ll 5070..) records that it is make_choices that produces
>> these and make_path and make_envelope instead make the controls
>> identical to the nodes themselves. IMHO the latter is a much better
>> approach as it does not make one bother with detecting whether the
>> curvature is slight or not and simple == tests are enough. Also,
>> someone may actually use a curve of very slight curvature for whatever
>> reason. So can the behaviour of make_choices please be aligned with
>> that of make_path/make_envelope in the matter of straight lines?
> Probably, but I have to investigate that.
control_points == nodes implies that one cannot calculate the derivatives
with the  simple formula of derivative, but must introduce another check.
Also very slight curvature are always a problem, w.r.t the choice of
control_points == nodes or not are not so important.

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