Gerber Circular Interpolation not handled correctly

[ldoolitt]

I have a Gerber file that originated in PADS. I can run it through translate2geda and read the resulting .fp file with pcb-rnd freshly built from subversion (2020-02-01, r29589). The straight lines look perfect, the arcs are definitely not.

One such case: G01X235154Y850183D02* G03X235154I-2061J0D01*

pretty clear circle according to Gerber spec:

• G01 linear interp
• X Y coordinates
• D02 move
• G03 circular counterclockwise
• X coordinate, same as before
• I center offset
• D01 draw

Note that the Gerber spec is clear about the possible ambiguity of 0 vs. 360 degrees. In Multi quadrant (G75) mode, "If the start point of the arc is equal to the end point, the arc is a full circle of 360deg". And yes, this Gerber file sets G75.

The output from translate2geda seems to be four flashed apertures scattered around the circumference.

[erichVK5]

I will need to ponder lines 1707 to 1776 in Plotter.java some more.

The code I repurposed for this is a bit opaque.

If you have a test file, with examples of right and wrong parsing, it would help.