(o<layer> - deposit one patterned layer of polymer)

;Usage:
;	Position the platform at the desired center
;	of the pattern with the dispense tip at the
;	desired dispense height.  Turn the HV to the
;	desired voltage and arm if desired.  Set up
;	global variables.  For each layer, pass as
;	parameters the fiber line angle and offset
;	(perpendicular to fiber direction), extrusion
;	rate (in mL/mm), movement rate (in mm/min),
;	and voltage level (future implementation).
;
;globals used:
;	_pattern_u	pattern u dimension
;	_pattern_v	pattern v dimension
;	_pattern_upitch	pattern u fiber pitch
;	_pattern_vpitch	pattern v fiber pitch
;	_pattern_angle	fiber angle of U axis relative to X axis
;	_loops		loop at end of pattern, 0 or 1
;	_loopskip	number of fibers to skip in loop (Zamboni pattern)
;
;inputs:
;	[angle] [offset_u] [offset_v] [extr_rate] [movement_rate] [voltage] 

o<layer> sub

; capture initial x and y (center of pattern)
; for each fiber, compute start and end points of straight segment
; from u and v dimensions and angle