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Mon, 09 Jul 2018 13:49:47 -0700 (PDT) | |
From: | "vovka (vzhbanov AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> |
X-Google-Original-From: | vovka <vovka AT gmail DOT com> |
Date: | Mon, 9 Jul 2018 23:49:44 +0300 |
To: | geda-user AT delorie DOT com |
Subject: | Re: [geda-user] adventures using arrows (for documentation), or |
cross my lines | |
Message-ID: | <20180709204944.GA921@debian.lokolhoz> |
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References: | <20180702125528 DOT D32CF81F76FE AT turkos DOT aspodata DOT se> |
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Hi Karl, On Mon, Jul 02, 2018 at 02:55:28PM +0200, karl AT aspodata DOT se wrote: > I'm trying to make arrows to be used when writing about electronic > design and theory. > > Here is such a symbol: > > $ cat arrow.sym > v 20150930 2 > H 3 0 0 0 -1 -1 1 -1 -1 -1 -1 -1 4 > M 0,0 > L -15,74 > L 15,74 > z > $ > > and I can use something like [1] to scale it to a suitable size. > > With thoose symbols I can create things like [2] so I can write about > the relationship between currents and voltages. > > As can seen from [2] the current arrow looks nice, but the voltage > arrow goes below the horizontal line, it should stop at the line, not > go beyond it. > > If we look at the arrow sym (Hierarchy->Down symbol) and set the fill > type to hollow, we see that the lines has a witdh > 0. Line width = 0 > is useful for filled polygons, since then the corners would be at line > end coordinates and the arrow wouldn't go below the line in [2]. > > There are three ways I could solve the "go below" problem. > > a, nudge the arrow upwards > b, make the "PATH" object have true line width of 0, at least for filled > polygons, i.e. patch gschem/lepton-schematic to make that happen. > c, use same line width as horiz. line, and use round cap style, i.e. > patch gschem/lepton-schematic so that they honor the cap style entry > which is currently completely ignored and and an undocumented cap > style is used instead (called "miter" in postscript), see [3]. You can mitigate the issue a bit by using a smaller line width. The smallest width is 1, since 0 means "default width" which is really 10. E.g. use the following path definition line: H 3 1 0 0 -1 -1 1 -1 -1 -1 -1 -1 4 > > I'd prefer c to happen, since that would solve other line corner to > straight line situations. > > How difficult is that to implement and would such a patch be accepted ? Dunno. I implemented capstyle support for lines a few years ago though some things have changed since then. Please look at edacairo.c. You can see how it is currently done for lines, and the eda_cairo_path function is the one to play with in this case, I believe. You'll probably have to read some docs of how things are done with cairo. Your patch will be accepted if it works properly. Just open a PR as described at [1] or send it here. [1] https://github.com/lepton-eda/lepton-eda/blob/master/CONTRIBUTING.md -- Vladimir
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