Controls the length of the offset tangent extension lines. The amount of extension at each end of an offset curve depends upon the extension factor used. The extension factor is a multiple of the offset distance.
rough_type
int
1 for rough type, 0 otherwise rough_type = 1 will produce a spline or splines that approximate the offset curve(s). The approximation may not be as accurate as for the regular offset, but should be faster.