I use Ultiboard, so have the option of generating output in HP
Graphics Language or Gerber. Looking at the file of the same project
produced in the two languages, it seems to me that it would be
fastest to use a translation of Gerber to HP G/L -- convert
the "tools" that Gerber flashes for different pad sizes and trace
widths to different pen sizes.
With HP G/L and Ultiboard, a circle is drawn with the "Arc Absolute"
command, using a chord angle of 1 degree. This is very slow. I
use "Search and Replace" to change the chord angle to 15 or 30
degrees which speeds it up dramatically. I guess you could
use "Search and Replace" to draw a circle using CI, but this assumes
that the current pen position is the center of the circle (which it
is not) and you need to recalculate the coordinates with a little
trig to determine the true center of a circle.
