[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] Re: #5086 Fix dashed line errors

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@David Kastrup

The following doesn't depend on behavior I've touched, but it should illustrate that LilyPond behaves consistently with what I've asserted about PS..

Is this what you had in mind?

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[issues:#5086] Fix dashed line errors

Status: Started
Created: Tue Mar 07, 2017 04:45 AM UTC by David Nalesnik
Last Updated: Mon Mar 13, 2017 03:47 PM UTC
Owner: David Nalesnik

Fix dashed line errors

There are two errors in lily/line-interface.cc which cause
dashed lines to be drawn inaccurately.

(1) Line-thickness is improperly subtracted from the "off"
value in Line_interface::make_dashed_line. This was done,
presumably, to account for the line cap of each dash. In fact,
PostScript discounts the line cap when constructing the pattern.

(2) Dashed lines are constructed so that they begin and end
with a dash. Thus, a dashed line is built of dash + whitespace
units and a last lone dash. Period is not adjusted in
Line_interface::line for this last dash, which can lead to a
noticeable difference in its length compared to other dashes.

Correcting these flaws ensures that dashed lines end with a
dash rather than whitespace, and that terminating dashes are
not clipped. Also, the number of dashes drawn reflects the
number calculated.

http://codereview.appspot.com/320320043

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