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From: "karl AT aspodata DOT se [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] PCB silk layer image script
In-reply-to: <6b291694-f248-aa27-aa38-732ad42096d6@linetec.nl>
References: <6877754c-dcb7-db34-dd39-419de060ad7a AT linetec DOT nl> <20231001134334 DOT D3643862293F AT turkos DOT aspodata DOT se> <f8294789-b9a1-9183-58f1-ea951b5c7181 AT linetec DOT nl> <20231001191307 DOT 88D638622949 AT turkos DOT aspodata DOT se> <6b291694-f248-aa27-aa38-732ad42096d6 AT linetec DOT nl>
Comments: In-reply-to "Richard Rasker (rasker AT linetec DOT nl) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
   message dated "Sun, 01 Oct 2023 22:54:15 +0200."
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Date: Mon,  2 Oct 2023 00:35:27 +0200 (CEST)
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Precedence: bulk

Richard Rasker:
...
> When I use pcb instead of pcbfill, two things are different:
> 
> - The result now ends up at the bottom left of Layer 1 named 'poly' 
> instead of Layer 10 named 'silk' -- which usually means it is on the top 
> copper layer.

 To be uptodate, the pcb line should be something like:
Layer(5, "top silk", "silk)

 To have the logo in cupper is probably not useful, but why not.

> - Polygons now have one co-ordinate per line.
...

 Pcb files is like c source files, pcb treat newlines as a space,
 so it is fine to have them one per line or all on one line.

> >>> I can help with a program doing that if you wish.
> >> That would be nice, although I should of course try and figure it out
> >> for myself first. I see that the resulting PCB file features large
> >> polygons, so if changing the size beforehand is not possible, I'd say
> >> the logical approach would be to find the lowest Y value (the topmost
> >> polygon point), and subtract this value from all Y values - [...]
...
> From what I see, Y co-ordinates can 
> be located using the " [0-9]+" regex (so including a leading space), 
> starting from line 6 in the pcb logo file; the lowest value found should 
> then be subtracted from all Y values, effectively moving the logo to the 
> top left. Then the highest X and Y values should be determined, which 
> then define the overall pcb size.

Yes, about so.


$ head -10 < TestLogo.pcb 
PCB["" 850000 1100000]

Grid[1000.000000 0 0 0]

Layer(1 "poly")
(
        Polygon("clearpoly")
        (
                [2304472 -3448985]
                [2303472 -3445930]
$

 So for output like that, it suffices to identify the [x-value y-value]
 lines.

Regards,
/Karl Hammar