Le 18/04/2012 20:25, Dick Hollenbeck a écrit :
I am working on this today.
My gut says this:
Basically it comes down to the fact that we cannot describe an area larger than
about 12
feet with the nanometer internal units.
Jean-Pierre,
Can you first look over the attached patch, then play with it.
This basically fixes the crash, but I think there's more finishing touches that
need to be
done.
I need to get back to work now.
Thank you very much,
Dick
I'll work on that tomorrow.
I also make some tests.
Under Windows I did now have crashes, but I had other issues.
my opinion is with 32 bits integers we cannot handle more than something like
50 to 70 cm,
with nanometers units.
I noticed there are a lot of issues when calculating distance between 2 points.
Assuming calculations are using integers, with 32 bits we can handle 2 meters
distances only.
if Xmax and Ymax are Y and Y difference between 2 points,
only Y or Y max <= 1.4 meter, if sqrt( Xmax*Xmax + Ymax*Ymax) always < 2m.
Because a distance is always >= 0, this means X and Y coordinates must have
absolute coordinates < 70 cm.
With margins around work area, and because Pcbnew and Gerbview use a page only
with positive coordinates,
the active area has a size < 50cm, roughly 20 inches, or A3 or B page size.
--
Jean-Pierre CHARRAS
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