Re: gEDA-user: Toporouter Changes

[Peter TB Brett <peter@xxxxxxxxxxxxx>]

On Tue, 07 Jul 2009 07:16:04 -0500, Bill Gatliff <bgat@xxxxxxxxxxxxxxx>
wrote:
> Anthony Blake wrote:
>>
>> I would prefer to implement this sort of functionality with topological
>> directives or constraints, and avoid geometric constraints if possible.
>>
> 
> Kind of like providing the circuit-board equivalent of a geological
> topographical/relief map, so the algorithms know where the "valleys"
> (preferred paths) and "peaks" (mountains, don't climb them unless
> necessary) are?  And the lakes, airports, Area 51's, etc....  Except
> that with circuit boards it would be more than 3-D, because some of the
> mountains would be abstract things like excessive trace length (which
> might later trigger the addition of a via and then a retry), DRC rules,
> desire to avoid the extreme edges of the board, and so on...  An [n]-D
> "relief map"...
> 

Yes, you've just described geometric constraints in great detail. :P As I
understand it, topological constraints are something completely different!

                                   Peter

-- 
Peter Brett <peter@xxxxxxxxxxxxx>
Remote Sensing Research Group
Surrey Space Centre



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