Sack Library Documentation
sack::image::do_inv_line Macro
#define do_inv_line(pb,x,y,xto,yto,d) do_line( pb,y,x,yto,xto,d)

now why would we need an inverse line? I don't get it.... anyhow this would draw from the end to the start... basically this accounts for rounding errors on the orward way.

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