gEDA-user: gerber G74 query

[Peter Baxendale <peter.baxendale@durham.ac.uk>]

Any gerber experts out there who know if the below is valid rs274x? The
thing I'm worried about is that after the G74 there are linear
interpolations, but there's no explicit return to linear mode from the
previous G75 circular. Gc-prevue displays it as it's meant to be, but
gerbv doesn't. If I put a G01 after the G74 then gerbv and gc-prevue
both display it ok.

In rs274xrevd_e.pdf it says "G02 and G03 specify single quadrant (90°)
circular interpolation; G74 disables it.", but I'm not sure what this
means (disables what?).

So is this a bug in gerbv, or an ambiguity in the standard, or is it
sloppy gerber which gc-prevue can cope with?

*%FSLAX24Y24*%
*%MOIN*%
G01*
%ADD17C,0.0080*%
%ADD25C,0.0500*%
D17*
X275095Y118850D02*
G75*
G02*X274966Y118923J150D01*
G74*
D25*
X286281Y117619D02*
X286764D01*
X286764Y117629D02*
Y122729D01*
X283784Y122729D01*
X283784D02*
X281763Y120709D01*
M02*
-- 
Peter Baxendale <peter.baxendale@durham.ac.uk>



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