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From: Gerben Wierda <gerben.wierda@rna.nl>
Newsgroups: gmane.comp.tex.context
Subject: METAPOST: How do I get this 'max' cutafter to work?
Date: Tue, 21 Apr 2020 13:29:29 +0200
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--Apple-Mail=_A2CF9EA1-6164-46DE-8E91-8500A10A6ECC
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain;
	charset=utf-8

I have these two paths, but cutting doesn=E2=80=99t work because the =
path to be cut takes the wrong intersection regardless of how I direct =
the path to be cut after (reverse or not).

The path to cut after is a triangle with the base horizontal and the =
path to cut is a vertical line. The top of the triangle is the endpoint =
of the line and is selected as intersection by cutafter. This happens =
also if I reverse the triangle path, strangely enough. I have an =
alternative cutting algorithm, but that cuts as long as the length of =
cuttings is not 0, which is the case at the top too, so it won=E2=80=99t =
cut further.

I need a reliable algorithm to make a =E2=80=98maximum cutafter=E2=80=99. =
What might be a good approach?

G

path arrowHead;
arrowHead :=3D
  (542,-77.000186920166016)..controls =
(545.33333333333337,-77.000186920166016) and =
(548.66666666666663,-77.000186920166016)
  ..(552,-77.000186920166016)..controls =
(550.33333333333337,-73.666853586832687)
  and (548.66666666666663,-70.333520253499344)
  ..(547,-67.000186920166016)..controls =
(545.33333333333337,-70.333520253499344)
  and (543.66666666666663,-73.666853586832687)
  ..cycle;

path connection;
connection :=3D
  (420.00004959106445,-367)..controls (420.66670256708773,-367) and =
(421.333355543111,-367)
  ..(422.00000851913427,-367)..controls (425.33333917170194,-367) and =
(428.6666698242696,-367)
  ..(432.00000047683727,-367)..controls (442.00000015894574,-367) and =
(451.99999984105426,-367)
  ..(461.99999952316273,-367)..controls (464.76142345324098,-367) and =
(467,-364.76142382108867)
  ..(467,-361.99999997656772)..controls (467,-293.99999999218926) and =
(467,-226.00000000781074)
  ..(467,-158.00000002343228)..controls (467,-155.23857623850762) and =
(469.23857634039018,-153)
  ..(472.00000014901161,-153)..controls (495.33333338300389,-153) and =
(518.66666661699617,-153)
  ..(541.99999985098839,-153)..controls (544.76142368504975,-153) and =
(547,-150.76142367339932)
  ..(547,-147.99999983662815)..controls (547,-125.99999994554271) and =
(547,-104.00000005445727)
  ..(547,-82.000000163371837)..controls (547,-78.666668047283764) and =
(547,-75.333335931195691)
  ..(547,-72.000003815107618)..controls (547,-70.333398183460417) and =
(547,-68.666792551813217)
  ..(547,-67.000186920166016);

show connection cutafter arrowHead;
show connection cutafter (reverse arrowHead);



--Apple-Mail=_A2CF9EA1-6164-46DE-8E91-8500A10A6ECC
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
	charset=utf-8

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">I =
have these two paths, but cutting doesn=E2=80=99t work because the path =
to be cut takes the wrong intersection regardless of how I direct the =
path to be cut after (reverse or not).<div class=3D""><br =
class=3D""></div><div class=3D"">The path to cut after is a triangle =
with the base horizontal and the path to cut is a vertical line. The top =
of the triangle is the endpoint of the line and is selected as =
intersection by cutafter. This happens also if I reverse the triangle =
path, strangely enough. I have an alternative cutting algorithm, but =
that cuts as long as the length of cuttings is not 0, which is the case =
at the top too, so it won=E2=80=99t cut further.</div><div class=3D""><br =
class=3D""></div><div class=3D"">I need a reliable algorithm to make a =
=E2=80=98maximum cutafter=E2=80=99. What might be a good =
approach?</div><div class=3D""><br class=3D""></div><div class=3D"">G<br =
class=3D""><div class=3D""><br class=3D""></div><div class=3D""><div =
class=3D""><font face=3D"Courier" class=3D""><span style=3D"font-style: =
normal;" class=3D"">path arrowHead;</span></font></div><div =
class=3D""><font face=3D"Courier" class=3D""><span style=3D"font-style: =
normal;" class=3D"">arrowHead :=3D</span></font></div><div =
class=3D""><font face=3D"Courier" class=3D""><span style=3D"font-style: =
normal;" class=3D"">&nbsp; (542,-77.000186920166016)..controls =
(545.33333333333337,-77.000186920166016) and =
(548.66666666666663,-77.000186920166016)</span></font></div><div =
class=3D""><font face=3D"Courier" class=3D""><span style=3D"font-style: =
normal;" class=3D"">&nbsp; ..(552,-77.000186920166016)..controls =
(550.33333333333337,-73.666853586832687)</span></font></div><div =
class=3D""><font face=3D"Courier" class=3D""><span style=3D"font-style: =
normal;" class=3D"">&nbsp; and =
(548.66666666666663,-70.333520253499344)</span></font></div><div =
class=3D""><font face=3D"Courier" class=3D""><span style=3D"font-style: =
normal;" class=3D"">&nbsp; ..(547,-67.000186920166016)..controls =
(545.33333333333337,-70.333520253499344)</span></font></div><div =
class=3D""><font face=3D"Courier" class=3D""><span style=3D"font-style: =
normal;" class=3D"">&nbsp; and =
(543.66666666666663,-73.666853586832687)</span></font></div><div =
class=3D""><font face=3D"Courier" class=3D""><span style=3D"font-style: =
normal;" class=3D"">&nbsp; ..cycle;</span></font></div><div =
class=3D""><font face=3D"Courier" class=3D""><span style=3D"font-style: =
normal;" class=3D""><br class=3D""></span></font></div><div =
class=3D""><font face=3D"Courier" class=3D""><span style=3D"font-style: =
normal;" class=3D"">path connection;</span></font></div><div =
class=3D""><font face=3D"Courier" class=3D""><span style=3D"font-style: =
normal;" class=3D"">connection :=3D</span></font></div><div =
class=3D""><font face=3D"Courier" class=3D""><span style=3D"font-style: =
normal;" class=3D"">&nbsp; (420.00004959106445,-367)..controls =
(420.66670256708773,-367) and =
(421.333355543111,-367)</span></font></div><div class=3D""><font =
face=3D"Courier" class=3D""><span style=3D"font-style: normal;" =
class=3D"">&nbsp; ..(422.00000851913427,-367)..controls =
(425.33333917170194,-367) and =
(428.6666698242696,-367)</span></font></div><div class=3D""><font =
face=3D"Courier" class=3D""><span style=3D"font-style: normal;" =
class=3D"">&nbsp; ..(432.00000047683727,-367)..controls =
(442.00000015894574,-367) and =
(451.99999984105426,-367)</span></font></div><div class=3D""><font =
face=3D"Courier" class=3D""><span style=3D"font-style: normal;" =
class=3D"">&nbsp; ..(461.99999952316273,-367)..controls =
(464.76142345324098,-367) and =
(467,-364.76142382108867)</span></font></div><div class=3D""><font =
face=3D"Courier" class=3D""><span style=3D"font-style: normal;" =
class=3D"">&nbsp; ..(467,-361.99999997656772)..controls =
(467,-293.99999999218926) and =
(467,-226.00000000781074)</span></font></div><div class=3D""><font =
face=3D"Courier" class=3D""><span style=3D"font-style: normal;" =
class=3D"">&nbsp; ..(467,-158.00000002343228)..controls =
(467,-155.23857623850762) and =
(469.23857634039018,-153)</span></font></div><div class=3D""><font =
face=3D"Courier" class=3D""><span style=3D"font-style: normal;" =
class=3D"">&nbsp; ..(472.00000014901161,-153)..controls =
(495.33333338300389,-153) and =
(518.66666661699617,-153)</span></font></div><div class=3D""><font =
face=3D"Courier" class=3D""><span style=3D"font-style: normal;" =
class=3D"">&nbsp; ..(541.99999985098839,-153)..controls =
(544.76142368504975,-153) and =
(547,-150.76142367339932)</span></font></div><div class=3D""><font =
face=3D"Courier" class=3D""><span style=3D"font-style: normal;" =
class=3D"">&nbsp; ..(547,-147.99999983662815)..controls =
(547,-125.99999994554271) and =
(547,-104.00000005445727)</span></font></div><div class=3D""><font =
face=3D"Courier" class=3D""><span style=3D"font-style: normal;" =
class=3D"">&nbsp; ..(547,-82.000000163371837)..controls =
(547,-78.666668047283764) and =
(547,-75.333335931195691)</span></font></div><div class=3D""><font =
face=3D"Courier" class=3D""><span style=3D"font-style: normal;" =
class=3D"">&nbsp; ..(547,-72.000003815107618)..controls =
(547,-70.333398183460417) and =
(547,-68.666792551813217)</span></font></div><div class=3D""><font =
face=3D"Courier" class=3D""><span style=3D"font-style: normal;" =
class=3D"">&nbsp; ..(547,-67.000186920166016);</span></font></div><div =
class=3D""><font face=3D"Courier" class=3D""><span style=3D"font-style: =
normal;" class=3D""><br class=3D""></span></font></div><div =
class=3D""><font face=3D"Courier" class=3D""><span style=3D"font-style: =
normal;" class=3D"">show connection cutafter =
arrowHead;</span></font></div><div class=3D""><font face=3D"Courier" =
class=3D""><span style=3D"font-style: normal;" class=3D"">show =
connection cutafter (reverse arrowHead);</span></font></div></div><div =
class=3D""><br class=3D""></div><div class=3D""><br =
class=3D""></div></div></body></html>=

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