[curve] — for parametric_curve

Key	Values	Notes
family	maurer_rose, lissajous, hypotrochoid, superformula, harmonograph	The curve family. Required inside the table; the table itself is optional and absent means maurer_rose. An unknown name is a surfaced error. The epitrochoid is hypotrochoid with a negative n — the sign picks which circle rolls. n and d are read per family; their ranges are in the generated parameter block above.