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Re: Latest info on copper zones using solid polygons without outline thickness.


Dear all DEV !
I am currently designing pcb using zuken's cr5000 software, I would like to
contribute to kicad's development, this is gerber when exported from
cr5000, they use line and arc to create copper zones, hopefully this will
is a good idea for us

Vào Th 2, 10 thg 6, 2019 vào lúc 01:51 jp charras <jp.charras@xxxxxxxxxx>
đã viết:

> Le 09/06/2019 à 19:56, Tomasz Wlostowski a écrit :
> > On 05/06/2019 21:21, jp charras wrote:
> >
> >> It is on the master branch (just committed).
> >
> > Hi JP,
> >
> > I gave it a try with a bunch of designs. Here are my observations:
> > - The filled zones look correct on the super-complex board and the
> > number of unconnected nets is identical to the old algorithm.
> > - There's a serios issue: connectivity algo can generate false positives
> > (thinking zones are connected to tracks or other zones) because is still
> > assumes all zones have thick outlines (see CN_ZONE::ContainsPoint). Did
> > you foresee any means of indicating this in the file format? Should
> > Gerber/other exporters be changed accordingly?
> > - I would rephrase the board setup zone filling option choice - it's the
> > max approximation error that defines the drawing quality, not the fact
> > that zones are outlined with rounded segments. My choice for the option
> > would be a single option "Use legacy zone filling outline method", off
> > by default.
> > - @Wayne/Seth I agree with JP that the change to the zone filling
> > algorithm is not very intrusive (and I also trust Clipper's
> > inflate/erode algorithms - they're used in the current zone filler and
> > never failed us so far).
> >
> > I can fix the connectivity issue. Who's in for Gerber/other exporters
> > (if needed?)
> >
> > Cheers,
> > Tom
> First, thanks Tom for your test.
> But are the drawing issues (calculation time and memory overflow) fixed
> by this change?
> They were the main reason of this change.
> * Unless bugs, plot functions are updated and are compatible with both
> zone filling algos.
> * The file format keep trace of the zone filling algo that filled the
> zone (of course, because do not know how the zone was filled can create
> serious issues):
> the flag " (filled_areas_thickness no)" is added in the zone section
> when the fill algo is "do not use thick outline".
> It also ensure a "old" Pcbnew version cannot create broken Gerber files.
> * The accessor to know the fill algo used to fill the zone is:
>  bool GetFilledPolysUseThickness() const
> that returns false for the new algo.
> * I was not aware of the connectivity issue. Please, fix it.
> Thanks.
> * About the zone setup dialog:
> For me, the choice is temporary, until we are confident with the new algo.
> Usually, when a new option is added, the default choice is: keep the old
> behavior.
> It avoid many bug reports.
> However make the new algo the default could be the best way to test it...
> I am not thrilled by messages like "Use legacy ..." because only core
> developpers know the difference between "legacy" and "current" or "new"
> about algorithms.
> In fact, in my mind, the choice should be removed for the stable 6.0
> version: the user has no knowledge to choose the right option.
> --
> Jean-Pierre CHARRAS
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