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a picadillo

From: M Douglas McIlroy
Subject: a picadillo
Date: Fri, 2 Oct 2020 15:25:29 -0400

The pic code below intends to specify a tailless arrow. (Linewid, not so
intuitively, sets the default length of horizontal line segments.)
linewid  = 0
arrow right
Pic balks: "cannot draw arrow on object with zero length". Yet a point and
a direction are all one needs to place an arrowhead. (The current point in
the example is (0,0).)
A workaround is to make linewid smaller than arrowht (the length of an
arrowhead) but not zero. Nevertheless, the example violates Kernighan's law
about handling zeros, "Do nothing gracefully."

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