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From:	"Sergey Stepanov (no DOT such DOT process AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date:	Fri, 13 Jul 2018 20:29:36 +0500
Message-ID:	<CABuVarJby3s+-d5OFt-KkiWqn53wgQaEE8iBZ+NQmobx9V62vQ@mail.gmail.com>
Subject:	Re: [geda-user] adventures using arrows (for documentation), or cross
	my lines
To:	geda-user AT delorie DOT com
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Reply-To:	geda-user AT delorie DOT com

Hello, Karl

> That arrow could be done right there in the sch-file, like

You are perfectly right, this is it:
H 3 0 1 0 -1 -1 1 -1 -1 -1 -1 -1 4
M 220,132
C 205,115 205,85 220,68
L 100,100
z

But still:
- thick line overwrites sharp end of arrow
- every editing mistake makes this arrow broken
- gEDA is lack of precise editing of symbol elements, like rotating by
arbitrary (or at least, 30^o, 45^o) angle or shifting, or scaling,
etc.
So one have to write some scripts to do these things.

The solution for my code (and to this ^^^) is to not draw arrow's line
from the tip, but from the opposite side from the arrow triangle, like
I do in this horizontal arrow from (0,0) to (5,0) with tip at (0,0):

// Arrow
cairo_move_to(cr, to_device_x(0.0), to_device_y(0.0));
cairo_arc(cr, to_device_x(3.8038), to_device_y(0.0),
to_device(1.1368), to_radians(135.), to_radians(135.+90.));
cairo_close_path(cr);
cairo_fill(cr);
// Bar
cairo_move_to(cr, to_device_x(2.667), to_device_y(0.0));
cairo_line_to(cr, to_device_x(5.0), to_device_y(0.0));
cairo_set_line_width(cr, to_device(0.25));
cairo_stroke(cr);

But this need some changes in line drawing in gedacairo, so I gave up.

чт, 12 июл. 2018 г. в 23:47, <karl AT aspodata DOT se>:
>
> Sergey:
> > Some times ago I tried to solve similar problem about arrows.
> > The result is in the attached patch. It adds new "Line cap style" as
> > Arrow. The result can be seen at http://tinypic.com/r/b4htnl/9 .
> > The provided code is quick and dirty, arrow length is hardcoded, pdf
> > export problems, and so on, and so forth.. :-(
> >
> > So, you can do everything you want with it. It is applied to the
> > latest git sources.
>
> That arrow could be done right there in the sch-file, like
> H ...
> M ...
> A ...
> L ...
> z
>
> with the right values, except that your patch handles the rotation,
> which is very nice. You still have the problem of making the tip be
> where it should instead of going too far.
>
> Regards,
> /Karl Hammar
>
> -----------------------------------------------------------------------
> Aspö Data
> Lilla Aspö 148
> S-742 94 Östhammar
> Sweden
> +46 173 140 57
>
>

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