Re: gEDA-user: General Layers questions

[Stephan Boettcher <boettcher@xxxxxxxxxxxxxxxxxx>]

DJ Delorie <dj@xxxxxxxxxxx> writes:

>> That is up to the HID to find the composits with attribute
>> "type=via", and present them in a via toll selector.
>
> I disagree with this.
>
> The HID is the Human Interaction Device - how the information is
> presented to the user.  GUI, printer, etc.
>
> The HID is the wrong place to be assigning *meaning* to the data.
> That is still in the core.  The fact that some composites are "vias"
> is something intrinsic to the pcb design, independent of what color
> you make it on the screen, and independend of how vias are implemented
> at the lowest internal levels.

Physical meaning is "here is a hole in the board", "here is a copper
circle on layer 1". Those meanings appear in elements, vias, whatever.
That a hole with concentric pads is a via has no meaning except for how
those came to be.  DRC does not care about vias.  It cares about hole
diameters and copper annulus. Connectivity also does not care about
vias.  Only the human in front of the screen cares about vias.

-- 
Stephan



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