🚀 go-pugleaf

I'm developing an application which uses drawpoly() to put curves on screen.
I have one particular curve ( out of hundreds, so far ) which causes drawpoly()
to fail and graphresult returns -6, which is grNoScanMem - out of memory in 
scan fill.  I have no idea why this occurs and want to know how to prevent it,
as it's most disconcerting for the user to attempt to plot a curve, and have 
everything work except for the actual curve.
    The interesting thing is that requesting a plot on a slightly different
scale will result in everything working perfectly.  Anyone know what is going
on and how to fix it?  The poly[] itself only contains just over 600 points,
and many of the curves I plot ( successfully ) are longer.

    Mazz.