Re: gEDA-user: General Layers questions

[Stephan Boettcher <boettcher@xxxxxxxxxxxxxxxxxx>]

Martin Kupec <martin.kupec@xxxxxxxxx> writes:

> On Tue, Mar 15, 2011 at 03:55:58PM -0600, John Doty wrote:
>> 
>> On Mar 15, 2011, at 3:35 PM, Martin Kupec wrote:
>> 
>> > There will be a struct called "via".
>> > It will contain a "hole" and pointers to attached object on
>> > all affected layers.
>> 
>> No. A "via" is only one kind of composite object. The list of kinds
>> of composite objects that might appear on a board is unbounded. There
>> isn't even a single kind of via in real life. Having an ad hoc
>> implementation of each such object is impractical and confusing.
>> 
>> Well-designed software would avoid implementing such things as
>> special kludges, but would have a general facility for describing
>> them. Then, users could contribute to libraries of such descriptions,
>> so we would not be so dependent on developers to spoon feed us every
>> detail. Footprints are a particular case of this, but other kinds of
>> composite objects (subcircuits, antennas, delay lines, buried vias,
>> fuses, current sense resistors, printed inductors and capacitors,
>> ...) could also be in the library if the software properly
>> distinguished between primitive elements and composite objects.
>
> Ok. You got the point. I don't see how to do it right now, but I will
> think of it.
>
> We need at least "hole" element. And say which layers it goes through.
> But the rest can by "just footprint". The problem I see is that the
> number of layers affected differs, so the footprint has to accomodate
> that.

IMHO, as holes are circles draw on just another layer.  People were
asking for slots.  If they find a vendor to do them, they may just draw
lines on that layer as well.  Else, DRC shall flag non-circles.

Each such hole layer shall have a spec (attribute) to which (copper)
layers they electrically connect.  There will be at least one such layer
for each type of blind, burried, and through via.

The GUI will happily stack vias according to the selected routing style
into a composites and paste them on the layout, so for simple cases
nothing changes from how we work now.

-- 
Stephan


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