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Date: Tue, 2 Feb 2016 17:37:14 +0100
From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Subject: Re: [geda-user] The nature of gEDA layers
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Precedence: bulk

> Levels/depths are the drawing order of graphics items within a single
> layer.  What item shall be cleared by a line clearance, and what item
> shall persist?
> 
>  1st draw a DARK polygon
>  2nd draw a CLEAR circle areound a via hole
>  3rd draw a DARK circle and a DARK line wowards that circle
> 
> The CLEAR circle must not clear the via pad nor the line, but it must
> clear the polygon.  The standard library will assign level numbers to
> certain classes of graphical items, with gaps for special needs.

Now I got it, depth is useful to mix dark and clear. It is useful for example to draw thermals but ror the most cases it should not be needed.

I guess depth is in sort of local to avoid interleaved order for overlapping drawing drawing primitives?

Nicklas Karlsson