kicad-developers team mailing list archive

[jp charras <jp.charras@xxxxxxxxxx>]

Le 10/05/2016 à 18:28, Chris Pavlina a écrit :
> Part one of many to clean up pcbnew preferences and unify legacy vs GAL
> options.
> 
> This patch removes the option in legacy to hide via drills. As Tom
> indicated[1], the layout should as much as possible be WYSIWYG, and if a via
> has a drill it should show it. Therefore we chose to remove this option from
> legacy rather than add it to GAL.
> 
> This raises a question that needs to be resolved in a different way. There is a
> possibility to create vias with undefined drill diameter, in which case they
> will have whatever diameter the net class is set to. Legacy had an option to
> indicate this will drill presence or absence: absence of a drill mark indicated
> that the diameter was default.
> 
> I believe this is a very bad way to do it and needs to be fixed. First of all,
> if we *do* permit this behavior it needs to be shown in a different way. Hiding
> the drill is a particularly poor approach, because the netclass drill diameter
> changing can have destructive consequences for the layout, and it needs to be
> obvious that this has happened. In my view it is very unobvious to someone not
> familiar that this even exists, and hiding the drills subject to this behavior
> makes it *worse*. If we're keeping the behavior, we need a better way to
> indicate that drills are dynamically sized.

This is an opinion, which can be discussed.

AFAIK, since a long time the default via hole diameter does not exist. You can change the netclass
drill diameter without changing the via drill diameter of existing vias.
Therefore I do not see the problem you want to fix.

(The default via hole diameter can exist only in old boards)

> 
> Honestly I think the behavior needs to go away entirely and be replaced with a
> new way to make drills match the net class. Orson suggested to me that there
> could be a way to manually trigger an update of drill sizes. In GAL this can
> already be done on a selection. I'd like a way to update all drills of a
> certain size, though - for instance a quick "change drills that had the old
> netclass size to the new netclass size". Thoughts?
> 
> PLEASE, I'd like some input from people who actually do layout professionally,
> if any are presently stalking the mailing list. The question of whether or not
> things should change dynamically tends to be very important to them and I'd
> like to know what they think.
> 
> [1] https://misc.c4757p.com/pad/p/pcbnew-prefs
> 
> 
> 
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-- 
Jean-Pierre CHARRAS