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Date: Fri, 19 Feb 2016 05:18:11 +0100 (CET)
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Subject: Re: [geda-user] djopt: what does it do?
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On Thu, 18 Feb 2016, DJ Delorie wrote:

>
> I just tried auto-optimize on a test board and it all did what I
> expected - remove U-shaped traces and unneeded vias, and in general
> move traces to as to minimize overall trace lengths.  Miter converts a
> 90-degree join with a miter, you can test it with two lines.  Best to
> test with a coarse grid, of course.

Thank you, I've got somewhat closer to understanding what the feature is 
for. I've also read the comments in the code and prepared some demo/test 
cases. I still have a few questions, tho:

So removing U and decreasing overall trace length is for 90 degree joints 
only? Example: http://igor2.repo.hu/tmp/djopt1.pcb

The above change is made by debumpify and not unjaggy, right? What's the 
diff between unjaggy and debumpify? Especially, what'd be a good example 
where unjaggy would make modifications?

Doesn't djopt(auto) run miter? I thought auto ran all opts. Or is 
it "all-but-miter"? Example: http://igor2.repo.hu/tmp/djopt2.pcb

Does the via remover try to remove unnecessary bridges on the other layer 
or only vias that literally touches only one thing? Using this example I 
couldn't decide; it's also unclear why it leaves 3 vias instead of 0 or 2: 
http://igor2.repo.hu/tmp/djopt3.pcb

Shouldn't vianudge move the via left on this one: 
http://igor2.repo.hu/tmp/djopt4.pcb

What'd be a good example case for orthopull?


TIA,

Igor2