o<end_angle> sub
	; o<end_angle> call <0|2> <x> <y1><y2> <angle> <zstart><zend> <fincut> <mode>

	; right now only 0 and 2 work but hey that's most of what you'd do
	; 0: +x side
	; 1: +y side
	; 2: -x side
	; 3: -y side

	;G10 L0 ; re-read tool data
	G90	  ; absolute x,y,z
	G91.1 ; incremental i,j,k
	M101  ; enable Z-axis (M102 disables)
	G17   ; select XY plane for arcs

	#<M_CONVENTIONAL> = [FIX[#9/1] MOD 2 EQ 1]
	#<M_BOTHWAYS>     = [FIX[#9/2] MOD 2 EQ 1]
	#<M_PLUNGE>       = [FIX[#9/4] MOD 2 EQ 1]
	#<M_OUTSIDE>      = [FIX[#9/8] MOD 2 EQ 1]
	#<M_CLIMB>        = [FIX[#9/1] MOD 2 EQ 0]
	#<M_ONEWAY>       = [FIX[#9/2] MOD 2 EQ 0]
	#<M_HELIX>        = [FIX[#9/4] MOD 2 EQ 0]
	#<M_INSIDE>       = [FIX[#9/8] MOD 2 EQ 0]


	#<td> = #<_td>
	#<tr> = [#<td>/2]
	o1 if [EXISTS[#<_z_clearance>]]
		#<z_clearance> = #<_z_clearance>
	o1 else
		#<z_clearance> = #5
	o1 endif
	o3 if [EXISTS[#<_stepover>]]
		#<stepover> = #<_stepover>
	o3 else
		#<stepover> = [#<td>*0.4]
	o3 endif
	o4 if [EXISTS[#<_overlap>]]
		#<overlap> = #<_overlap>
	o4 else
		#<overlap> = [#<stepover>*0.4]
	o4 endif

	#<c> = #3
	#<b> = #4
	o5 if [#4 LT #3]
		#<c> = #4
		#<b> = #3
	o5 endif

	; inputs:
	; - climb/conv    (C)
	; - angle pos/neg (A)
	; - left or right (L)

	; outputs:
	; - #<b> or #<c>      (B) = L NE A
	; - order of movement (O) = C NE A
	; - sign of offsets   (S) = L

	#<M_ANGLE> = [#5 GE 0]
	#<M_LEFT>  = [#1 EQ 0]
	#<SW_B> = [#<M_LEFT>  XOR #<M_ANGLE>] ; use #<b>
	#<SW_O> = [#<M_CLIMB> XOR #<M_ANGLE>] ; order of movement

	#<sign> = 0
	o10 if [#1 EQ 0]
		#<sign> = 1
	o10 elseif [#1 EQ 2]
		#<sign> = -1
	o10 endif

	#<origin> = #<b>
	o11 if [#<SW_B>]
		#<origin> = #<c>
	o11 endif

	#<sign_off> = 1
	o12 if [#<M_ANGLE> NE 0]
		#<sign_off> = -1
		#<overlap> = [-#<overlap>]
	o12 endif

	G0 Z#<z_clearance>

	o100 if [#5 NE 0]

		#<l_total> = [[#<b>-#<c>]*ABS[SIN[#5]]-#<tr>]

		#<l_steps> = FUP[[#<l_total>-ABS[#8]]/#<stepover>]

		#<dl> = 0
		#<x1> = [SIN[#5]*#<overlap> + #<tr>*COS[#5]]
		#<x2> = [SIN[#5]*#<overlap> + #<dl>/COS[#5] + #<tr>*SIN[#5]*TAN[#5]]
		#<y1> = [COS[#5]*#<overlap> + #<dl>/SIN[#5] + #<tr>*COS[#5]/TAN[#5]]
		#<y2> = [COS[#5]*#<overlap> + #<tr>*SIN[#5]]

		G0 X[#2 + #<x1>*#<sign>] Y[#<origin> + #<y2>*#<sign>]
		G0 Z#6
		G1 Z#7

		o200 while [#<l_steps> GE 0]
			#<dl> = [#<l_total> - [#<l_steps>*#<stepover>+ABS[#8]]]

			#<x1> = [SIN[#5]*#<overlap> + #<tr>*COS[#5]]
			#<x2> = [SIN[#5]*#<overlap> + #<dl>/COS[#5] + #<tr>*SIN[#5]*TAN[#5]]
			#<y1> = [COS[#5]*#<overlap> + #<dl>/SIN[#5] + #<tr>*COS[#5]/TAN[#5]]
			#<y2> = [COS[#5]*#<overlap> + #<tr>*SIN[#5]]

			o201 if [#<M_BOTHWAYS>]
				o211 if [#<l_steps> MOD 2 NE #<M_CLIMB>]
					G1 X[#2 + #<x1>*#<sign>] Y[#<origin> - #<y1>*#<sign>]
					G1 X[#2 - #<x2>*#<sign>] Y[#<origin> + #<y2>*#<sign>]
				o211 else
					G1 X[#2 - #<x2>*#<sign>] Y[#<origin> + #<y2>*#<sign>]
					G1 X[#2 + #<x1>*#<sign>] Y[#<origin> - #<y1>*#<sign>]
				o211 endif
			o201 elseif [#<SW_O>]
				G1 X[#2 + #<x1>*#<sign>] Y[#<origin> - #<y1>*#<sign>]
				G1 X[#2 - #<x2>*#<sign>] Y[#<origin> + #<y2>*#<sign>]
			o201 else
				G1 X[#2 - #<x2>*#<sign>] Y[#<origin> + #<y2>*#<sign>]
				G1 X[#2 + #<x1>*#<sign>] Y[#<origin> - #<y1>*#<sign>]
			o201 endif

			#<dl> = [#<l_total> - [#<l_steps>*#<stepover>+ABS[#8]+#<stepover>*0.2]]
			#<x1> = [SIN[#5]*#<overlap> + #<tr>*COS[#5]]
			#<x2> = [SIN[#5]*#<overlap> + #<dl>/COS[#5] + #<tr>*SIN[#5]*TAN[#5]]
			#<y1> = [COS[#5]*#<overlap> + #<dl>/SIN[#5] + #<tr>*COS[#5]/TAN[#5]]
			#<y2> = [COS[#5]*#<overlap> + #<tr>*SIN[#5]]

			o202 if [#<M_BOTHWAYS>]
				; no rapid back for both-ways milling. that's the whole point.
			o202 elseif [#<SW_O>]
				G0 X[#2 - #<x2>*#<sign>] Y[#<origin> + #<y2>*#<sign>]
				G0 X[#2 + #<x1>*#<sign>] Y[#<origin> - #<y1>*#<sign>]
			o202 else
				G0 X[#2 + #<x1>*#<sign>] Y[#<origin> - #<y1>*#<sign>]
				G0 X[#2 - #<x2>*#<sign>] Y[#<origin> + #<y2>*#<sign>]
			o202 endif

			#<l_steps> = [#<l_steps>-1]
		o200 endwhile

		o207 if [#8 GT 0]
			#<dl> = [#<l_total>]
			#<x1> = [SIN[#5]*#<overlap> + #<tr>*COS[#5]]
			#<x2> = [SIN[#5]*#<overlap> + #<dl>/COS[#5] + #<tr>*SIN[#5]*TAN[#5]]
			#<y1> = [COS[#5]*#<overlap> + #<dl>/SIN[#5] + #<tr>*COS[#5]/TAN[#5]]
			#<y2> = [COS[#5]*#<overlap> + #<tr>*SIN[#5]]

			o203 if [#<SW_O>]
				G1 X[#2 + #<x1>*#<sign>] Y[#<origin> - #<y1>*#<sign>]
				G1 X[#2 - #<x2>*#<sign>] Y[#<origin> + #<y2>*#<sign>]
			o203 else
				G1 X[#2 - #<x2>*#<sign>] Y[#<origin> + #<y2>*#<sign>]
				G1 X[#2 + #<x1>*#<sign>] Y[#<origin> - #<y1>*#<sign>]
			o203 endif
		o207 endif
	o100 else


		o104 if [#<M_LEFT>]
			o114 if [#<M_CLIMB>]
				G0 X[#2 - #<tr> - ABS[#8]] Y[#<c> - #<overlap>]
				G0 Z#6
				G1 Z#7
				G1 Y[#<b> + #<overlap>]
			o114 else
				G0 X[#2 - #<tr> - ABS[#8]] Y[#<c> - #<overlap>]
				G0 Z#6
				G1 Z#7
				G1 Y[#<b> + #<overlap>]
			o114 endif
		o104 else
			o124 if [#<M_CONVENTIONAL>]
				G0 X[#2 + #<tr> + ABS[#8]] Y[#<c> - #<overlap>]
				G0 Z#6
				G1 Z#7
				G1 Y[#<b> + #<overlap>]
			o124 else
				G0 X[#2 + #<tr> + ABS[#8]] Y[#<c> - #<overlap>]
				G0 Z#6
				G1 Z#7
				G1 Y[#<b> + #<overlap>]
			o124 endif
		o104 endif




		o107 if [#8 GT 0]	
			G0 Z#<z_clearance>
			o101 if [#<M_LEFT>]
				o111 if [#<M_CLIMB>]
					G0 X[#2 - #<tr>] Y[#<c> - #<overlap>]
					G0 Z#6
					G1 Z#7
					G1 Y[#<b> + #<overlap>]
				o111 else
					G0 X[#2 - #<tr>] Y[#<c> - #<overlap>]
					G0 Z#6
					G1 Z#7
					G1 Y[#<b> + #<overlap>]
				o111 endif
			o101 else
				o121 if [#<M_CONVENTIONAL>]
					G0 X[#2 + #<tr>] Y[#<c> - #<overlap>]
					G0 Z#6
					G1 Z#7
					G1 Y[#<b> + #<overlap>]
				o121 else
					G0 X[#2 + #<tr>] Y[#<c> - #<overlap>]
					G0 Z#6
					G1 Z#7
					G1 Y[#<b> + #<overlap>]
				o121 endif
			o101 endif
		o107 endif
	o100 endif

	G0 Z#<z_clearance>

o<end_angle> endsub

M2