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Date: Sat, 3 Feb 2018 20:40:58 +0100
From: Josef Wolf <jw AT raven DOT inka DOT de>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Scope of the hires flag in PCB file format?
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On Sat, Feb 03, 2018 at 07:55:15PM +0100, karl AT aspodata DOT se wrote:

> > >   Symbol['!' 12]
> > >   (
> > >           SymbolLine(0 45 0 50 8)
> > >           SymbolLine(0 10 0 35 8)
> > >   )
> 
>  8.8 File Syntax
>  A special note about units: Older versions of pcb used mils (1/1000 inch) as the base unit;
>  a value of 500 in the file meant half an inch. Newer versions uses a "high resolution" syntax,
>  where the base unit is 1/100 of a mil (0.000010 inch); a value of 500 in the file means 5
>  mils. As a general rule, the variants of each entry listed below which use square brackets
>  are the high resolution formats and use the 1/100 mil units, and the ones with parentheses
>  are the older variants and use 1 mil units. Note that when multiple variants are listed, the
>  most recent (and most preferred) format is the first listed.

Yeah, I found this paragraph and I've read it more that a dozen times. 

> I.e. anything within [ ] are high res., anything within () are mil 
> (except angles, strings etc.).

OK. So the inner-most type of parens define the resolution. The outer parens
have no effect to the values which are enclosed in an inner pair of parens.

> So the above is Symbol with delta 0.12 mil,

Uh? Isn't the "12" the character code?

> and symbolline from point1 = (0,45mil) to point2 = (50mil,8mil), etc.

Thanks for the clarification! Maybe the paragraph could state this more
precisely with an example?

-- 
Josef Wolf
jw AT raven DOT inka DOT de