kicad-developers team mailing list archive

[jp charras <jp.charras@xxxxxxxxxx>]

Le 30/06/2014 12:16, Lorenzo Marcantonio a écrit :
> On Mon, Jun 30, 2014 at 12:10:30PM +0200, jp charras wrote:
>> The most important change is using mm and 4.5 format instead of inches
>> and 3.4 format.
>> This is mandatory, because the 3.4 format (coming from old pcbnew
>> internal units) creates truncations in coordinates.
> 
> I did the mm high resolution backend years ago... maybe it just was forgotten:P

Years ago, inches + 3.4 format *was* the high resolution (it was the
internal Pcbnew resolution, and therefore creates no rounding issue).

Sometimes, over the years, some interesting features disappear, due to
code re-factory or some other obscure reason.
Like using netcodes as netnames in spice netlists.

> 
>> Serious issues in polygons which can appear self-intersecting after
>> truncation.
>> After some tests with GC-Prevue and using some test boards, polygons
>> which were self-intersecting in 3.4 old format are now not
>> self-intersecting.
> 
> So the self intersection was a rounding issue? Interesting
> 

At least with my 2 test boards, yes.

-- 
Jean-Pierre CHARRAS