! Electronic Circuit diagrams with GLE
! Author: A. S. Budden <abudden@NOSPAMgataki.co.uk>

! Date:	 17th August 2007
! Version: 1.3

! Copyright:	 Copyright (C) 2005 A. S. Budden
!					 Permission is hereby granted to use and distribute this code,
!					 with or without modifications, provided that this copyright
!					 notice is copied with it. Like anything else that's free,
!					 electronics.gle is provided *as is* and comes with no warranty
!					 of any kind, either expressed or implied. By using this
!					 plugin, you agree that in no event will the copyright
!					 holder be liable for any damages resulting from the use
!					 of this software.

! Documentation ** gle_electronics.pdf **

! A simple function to draw a grid for reference
sub drawgrid gridscale
	default gridscale 1
	gsave
	set lwidth 0.005
	set lstyle 2
	for i = 0 to pageheight()/gridscale
		amove 0 i
		rline pagewidth()/gridscale 0
	next i

	for i = 0 to pagewidth()/gridscale
		amove i 0
		rline 0 pageheight()/gridscale
	next i

	grestore
end sub

! Connection point
sub connection
	circle 0.1 fill black
end sub

!===================================
! Resistors
!===================================

! Resistor base device
sub resistor
	gsave
	rline 1 0
	rline 0 0.5
	rline 2 0
	rline 0 -1
	rline -2 0
	rline 0 0.5
	rmove 2 0
	rline 1 0
	grestore
end sub

! Resistor base device
sub rresistor
	gsave
	rline 1 0
	rline 0.125 0.5
	rline 0.25 -1.0
	rline 0.25 1.0
	rline 0.25 -1.0
	rline 0.25 1.0
	rline 0.25 -1.0
	rline 0.25 1.0
	rline 0.25 -1.0
	rline 0.125 0.5
	rline 1 0
	grestore
end sub


! Horizontal resistor
sub rresistor_h rlabel$
	gsave
	@rresistor
	rmove 2 0.75
	set just BC
	set hei 0.8
	write rlabel$
	grestore
	rmove 4 0
end sub

! Vertical resistor
sub rresistor_v rlabel$
	gsave
	begin rotate -90
		@rresistor
	end rotate
	rmove 0.75 -2
	set just LC
	set hei 0.8
	write rlabel$
	grestore
	rmove 0 -4
end sub


! Horizontal resistor
sub resistor_h rlabel$
	gsave
	@resistor
	rmove 2 0.75
	set just BC
	set hei 0.8
	write rlabel$
	grestore
	rmove 4 0
end sub

! Vertical resistor
sub resistor_v rlabel$
	gsave
	begin rotate -90
		@resistor
	end rotate
	rmove 0.75 -2
	set just LC
	set hei 0.8
	write rlabel$
	grestore
	rmove 0 -4
end sub

! Horizontal potentiometer
sub potentiometer_hb rlabel$
	gsave
	@resistor
	rmove 2 -2
	rline 0 1.5 arrow end
	rmove 0 1.5
	set just BC
	set hei 0.8
	write rlabel$
	grestore
	rmove 4 0
end sub

! Vertical potentiometer
sub potentiometer_vr rlabel$
	gsave
	begin rotate -90
		@resistor
	end rotate
	rmove 2 -2
	rline -1.5 0 arrow end
	rmove -1.5 0
	set just RC
	set hei 0.8
	write rlabel$
	grestore
	rmove 0 -4
end sub

! Horizontal variable resistor
sub vresistor_h rlabel$
	gsave
	@resistor
	rmove 1 -1
	rline 2 2 arrow end
	rmove -1 0
	set just BC
	set hei 0.8
	write rlabel$
	grestore
	rmove 4 0
end sub

! Vertical Variable resistor
sub vresistor_v rlabel$
	gsave
	begin rotate -90
		@resistor
	end rotate
	rmove -1 -3
	rline 2 2 arrow end
	rmove 0 -1
	set just LC
	set hei 0.8
	write rlabel$
	grestore
	rmove 0 -4
end sub

!===================================
! Transistors
!===================================

! BJT Base
sub bjt leg direction
	gsave
	rline 1 0
	rmove 0 1
	rline 0 -2
	rmove 0 0.5
	if leg = 1 then
		if direction = 1 then
			rline 1 -0.5 arrow end
		else
			rline 1 -0.5 arrow start
		end if
		rmove -1 1.5
		rline 1 0.5
	else
		rline 1 -0.5
		rmove -1 1.5
		if direction = 1 then
			rline 1 0.5 arrow end
		else
			rline 1 0.5 arrow start
		end if
	end if
	grestore
end sub

! NPN BJT
sub npn_bjt bjtlabel$
	gsave
	bjt 1 1
	rmove 2 0
	set just LC
	set hei 0.8
	write bjtlabel$
	grestore
end sub

! PNP BJT
sub pnp_bjt bjtlabel$
	gsave
	bjt 0 0
	rmove 2 0
	set just LC
	set hei 0.8
	write bjtlabel$
	grestore
end sub

! Base MOSFET
sub mosfet channel
	! 0 is N channel, 1 is P channel
	gsave
	rline 1 0
	rmove 0 1
	rline 0 -2
	rmove 0.25 0
	rline 0 2/4
	rmove 0 1/4
	rline 0 2/4
	rmove 0 1/4
	rline 0 2/4
	rmove 0 -1/4
	rline 0.75 0
	rline 0 1/4
	rmove 0 -2
	rline 0 1/4
	rline -0.75 0
	rmove 0.75 0
	@connection
	rline 0 3/4
	if channel = 0 then
		rline -0.75 0 arrow end
	else
		rline -0.75 0 arrow start
	end if
	grestore
end sub

! N-Channel MOSFET
sub n_mosfet mlabel$
	gsave
	mosfet 0
	rmove 2.5 0
	set hei 0.8
	set just LC
	write mlabel$
	grestore
end sub

! P-Channel MOSFET
sub p_mosfet mlabel$
	gsave
	mosfet 1
	rmove 2.5 0
	set hei 0.8
	set just LC
	write mlabel$
	grestore
end sub

! IGBT
sub igbt igbtlabel$
	gsave
	rline 0.75 0
	rline 0 0.75
	rmove 0 -0.75
	rline 0 -0.75
	rmove 0.25 0.75
	rline 0 1
	rmove 0 -1
	rline 0 -1
	rmove 0 0.5
	rline 1 -0.5 arrow end
	rmove -1 1.5
	rline 1 0.5
	rmove 0 -1
	set hei 0.8
	set just LC
	write igbtlabel$
	grestore
end sub

!===================================
! Inductors
!===================================

! Single coil
sub coil
	gsave
	rmove 0.25 0
	arc 0.25 0 180
	grestore
	rmove 0.5 0
end sub

! Single double size coil
sub large_coil dot
	gsave
	rmove 0.5 0
	arc 0.5 0 180
	if dot = 1 then
		circle 0.1 fill black
	end if
	grestore
	rmove 1 0
end sub

! Base inductor
sub inductor core
	gsave
	rline 1 0
	for i = 1 to 4
		@coil
	next i
	rline 1 0
	if core = 1 then
		rmove -1 0.5
		rline -2 0
		rmove 0 0.2
		rline 2 0
	end if
	grestore
end sub

sub large_inductor dot_position
	gsave
	if dot_position = 1 then ! Dot at start
		@large_coil 1
	else
		@large_coil 0
	end if
	@large_coil 0
	@large_coil 0
	if dot_position = 2 then ! Dot at end
		@large_coil 1
	else
		@large_coil 0
	end if
	grestore
end sub

! Horizontal Inductor
sub inductor_h core ilabel$
	gsave
	@inductor core
	if core = 1 then
		rmove 2 1
	else
		rmove 2 0.5
	end if
	set hei 0.8
	set just BC
	write ilabel$
	grestore
	rmove 4 0
end sub

! Vertical Inductor
sub inductor_v core ilabel$
	gsave
	begin rotate -90
		@inductor core
	end rotate
	if core = 1 then
		rmove 1 -2
	else
		rmove 0.5 -2
	end if
	set hei 0.8
	set just LC
	write ilabel$
	grestore
	rmove 0 -4
end sub

! Transformer Base
sub xformer core type n1$ n2$
	gsave
	! Select type
	! 0: no dots
	! 1: no invert
	! 2: invert
	if type = 0 then
		leftdot = 0
		rightdot = 0
	end if
	if type = 1 then
		leftdot = 1
		rightdot = 2
	end if
	if type = 2 then
		leftdot = 1
		rightdot = 1
	end if
	begin rotate -90
		@large_inductor leftdot
	end rotate
	rmove 2 -4
	begin rotate 90
		@large_inductor rightdot
	end rotate
	if core = 1 then
		rmove -1.2 0
		rline 0 4
		rmove 0.4 0
		rline 0 -4
	end if
	grestore

	! Number of turns
	gsave
	rmove 0.25 0.25
!	rmove 0.5 0.5
	set just BC
	set hei 0.5
	write n1$
	rmove 1.5 0
	write n2$
	grestore
end sub

! Transformer with a double secondary
sub xformer_dblsecondary type location
	gsave
	! Select type (as xformer)
	if type = 0 then
		leftdot = 0
		rightdot = 0
	end if
	if type = 1 then
		leftdot = 1
		rightdot = 2
	end if
	if type = 2 then
		leftdot = 1
		rightdot = 1
	end if
	begin rotate -90
		@large_inductor leftdot
	end rotate

	! If location = 0, then balance
	! If location = 1, then draw above
	! If location = 2, then draw below
	if location = 0 then
		rmove 2 -1
	end if
	if location = 1 then
		rmove 2 2
	end if
	if location = 2 then
		rmove 2 -4
	end if

	! We are now at the bottom of the top coil
	begin rotate 90
		@large_inductor rightdot
	end rotate
	rmove 0 -6
	begin rotate 90
		@large_inductor rightdot
	end rotate
	rmove -1.2 0
	rline 0 10
	rmove 0.4 0
	rline 0 -10
	grestore
end sub




!===================================
! Capacitors
!===================================

! Base capacitor
sub capacitor
	gsave
	rline 1.75 0
	rline 0 1
	rmove 0 -2
	rline 0 1
	rmove 0.5 0
	rline 0 1
	rmove 0 -2
	rline 0 1
	rline 1.75 0
	grestore
end sub

! Base polarised capacitor
sub p_capacitor polarity
	! Polarity gives location of + side
	! polarity = 0: on left (and therefore top)
	! polarity = 1: on right
	gsave
	rline 1.5+1/8 0
	rmove 0 -1
	if polarity = 1 then
		box 0.25 2 fill black
	else
		box 0.25 2
	end if
	rmove 0.5 0
	if polarity = 1 then
		box 0.25 2
	else
		box 0.25 2 fill black
	end if
	rmove 0.25 1
	rline 1.5+1/8 0
	grestore
end sub

! Horizontal L Polarised Capacitor
sub p_capacitor_hl clabel$
	gsave
	@p_capacitor 0
	rmove 1 0.75
	rline 0.5 0
	rmove -0.25 -0.25
	rline 0 0.5
	rmove -1.25 -1

	rmove 2 1.25
	set hei 0.8
	set just BC
	write clabel$
	grestore
	rmove 4 0
end sub

! Horizontal R Polarised Capacitor
sub p_capacitor_hr clabel$
	gsave
	@p_capacitor 1
	rmove 2.75 0.75
	rline 0.5 0
	rmove -0.25 -0.25
	rline 0 0.5
	rmove -3 -1

	rmove 2 1.25
	set hei 0.8
	set just BC
	write clabel$
	grestore
	rmove 4 0
end sub

! Vertical Top Polarised Capacitor
sub p_capacitor_vt clabel$
	gsave
	begin rotate -90
		@p_capacitor 0
	end rotate
	rmove -1 -1.25
	rline 0.5 0
	rmove -0.25 -0.25
	rline 0 0.5
	rmove 0.75 1

	rmove 1.25 -2
	set hei 0.8
	set just LC
	write clabel$
	grestore
	rmove 0 -4
end sub


! Vertical Bottom Polarised Capacitor
sub p_capacitor_vb clabel$
	gsave
	begin rotate -90
		@p_capacitor 1
	end rotate
	rmove -1 -3
	rline 0.5 0
	rmove -0.25 -0.25
	rline 0 0.5
	rmove 0.75 2.75

	rmove 1.25 -2
	set hei 0.8
	set just LC
	write clabel$
	grestore
	rmove 0 -4
end sub



! Horizontal capacitor
sub capacitor_h clabel$
	gsave
	@capacitor
	rmove 2 1.25
	set hei 0.8
	set just BC
	write clabel$
	grestore
	rmove 4 0
end sub

! Vertical capacitor
sub capacitor_v clabel$
	gsave
	begin rotate -90
		@capacitor
	end rotate
	rmove 1.25 -2
	set hei 0.8
	set just LC
	write clabel$
	grestore
	rmove 0 -4
end sub

! Horizontal varicap
sub vcapacitor_h clabel$
	gsave
	@capacitor
	rmove 1 -1
	rline 2 2 arrow end
	rmove -3 -1
	rmove 2 1.25
	set hei 0.8
	set just BC
	write clabel$
	grestore
	rmove 4 0
end sub

! Vertical varicap
sub vcapacitor_v clabel$
	gsave
	begin rotate -90
		@capacitor
	end rotate
	rmove -1 -3
	rline 2 2 arrow end
	rmove -1 1
	rmove 1.25 -2
	set hei 0.8
	set just LC
	write clabel$
	grestore
	rmove 0 -4
end sub

!===================================
! Crystals
!===================================
sub crystal
	crystalgap = 0.25
	crystalboxw = 0.5
	crystalleglength = (4-(crystalgap*2 + crystalboxw))/2
	rline crystalleglength 0
	rmove 0 1
	rline 0 -2
	rmove crystalgap 0
	box crystalboxw 2
	rmove crystalboxw+crystalgap 0
	rline 0 2
	rmove 0 -1
	rline crystalleglength 0
end sub

sub crystal_h label$
	@crystal
	gsave
	rmove -2 1.2
	set just BC
	set hei 0.8
	write label$
	grestore
end sub

sub crystal_v label$
	gsave
	gsave
	begin rotate -90
		@crystal
	end rotate
	grestore
	rmove 1.2 -2
	set just LC
	set hei 0.8
	write label$
	grestore
	rmove 0 -4
end sub


!===================================
! Diodes
!===================================

DIODE_NORMAL = 0
DIODE_SCHOTTKY = 1
DIODE_ZENER = 2
DIODE_THYRISTOR = 3

! Base diode
sub diode type
	default type DIODE_NORMAL
	gsave
	rline 1.5 0
	rline 0 0.5
	rline 1 -0.5
	rline -1 -0.5
	rline 0 0.5
	rmove 1 -0.5
	rline 0 1
	rmove 0 -0.5
	gsave
	if type = DIODE_SCHOTTKY then
		schottky_depth = 0.15
		schottky_width = 0.25
		gsave
		rmove 0 0.5
		rline schottky_depth 0
		rline 0 -schottky_width
		grestore
		rmove 0 -0.5
		rline -schottky_depth 0
		rline 0 schottky_width
	else if type = DIODE_ZENER then
		zener_depth = 0.15
		gsave
		rmove 0 0.5
		rline zener_depth 0
		grestore
		rmove 0 -0.5
		rline -zener_depth 0
	else if type = DIODE_THYRISTOR then
		rline 0.5 -0.5
		rline 0 -0.5
	end if
	grestore
	rline 1.5 0
	grestore
end sub

! Horizontal right-facing Diode
sub diode_hr dlabel$ type
	default type DIODE_NORMAL
	gsave
	@diode type
	rmove 2 1
	set hei 0.8
	set just BC
	write dlabel$
	grestore
	rmove 4 0
end sub

! Horizontal left-facing Diode
sub diode_hl dlabel$ type
	default type DIODE_NORMAL
	gsave
	rmove 4 0
	begin rotate 180
		@diode type
	end rotate
	rmove -2 1
	set hei 0.8
	set just BC
	write dlabel$
	grestore
	rmove 4 0
end sub

! Vertical downward Diode
sub diode_vd dlabel$ type
	default type DIODE_NORMAL
	gsave
	begin rotate -90
		@diode type
	end rotate
	rmove 1 -2
	set hei 0.8
	set just LC
	write dlabel$
	grestore
	rmove 0 -4
end sub

! Vertical upward Diode
sub diode_vu dlabel$ type
	default type DIODE_NORMAL
	gsave
	rmove 0 -4
	begin rotate 90
		@diode type
	end rotate
	rmove 1 2
	set hei 0.8
	set just LC
	write dlabel$
	grestore
	rmove 0 -4
end sub

! Vertical downward LED
sub led_vd label$
	@diode_vd label$ DIODE_NORMAL
	gsave
	arroffset = 0.15
	set arrowsize 0.3
	set arrowangle 20
	!	rmove 0.65 1.85
	rmove 0.6 1.75
	rmove 0 arroffset
	rline 0.5 -0.5 arrow end

	rmove 0 -2*arroffset
	rline -0.5 0.5 arrow start
	grestore
end sub


sub bridge_rectifier blabel$
	gsave
	d_offset = (3 - sqrt(8)) / 2
	d_length = sqrt(8)
	@connection
	rline d_offset d_offset
	begin rotate 45
		@diode DIODE_NORMAL
	end rotate
	rmove d_length d_length
	rline d_offset d_offset
	@connection
	rline d_offset -d_offset
	begin rotate -45
		@diode DIODE_NORMAL
	end rotate
	rmove d_length -d_length
	rline d_offset -d_offset
	@connection
	rmove -6 0
	rline d_offset -d_offset
	begin rotate -45
		@diode DIODE_NORMAL
	end rotate
	rmove d_length -d_length
	rline d_offset -d_offset
	@connection
	rline d_offset d_offset
	begin rotate 45
		@diode DIODE_NORMAL
	end rotate
	rmove d_length d_length
	rline d_offset d_offset
	rmove -3 0
	set hei 0.8
	set just CC
	write blabel$
	grestore
end sub

! Opto Isolator
sub optocoupler optolabel$
	@diode_vd "" DIODE_NORMAL
	gsave
	rmove 3 0
	rline 0 1
	rline -1 0.5 arrow start
	rmove 0 -0.5
	rline 0 2
	rmove 0 -0.5
	rline 1 0.5
	rline 0 1
	set just LC
	rmove 0 -2
	set hei 0.8
	write optolabel$
	optoarrowoffset = 0.25
	optoarrowlength = 1
	set arrowsize 0.4
	set arrowangle 20
	rmove -1.2 optoarrowoffset
	rline -optoarrowlength 0 arrow start
	rmove 0 -optoarrowoffset*2
	rline optoarrowlength 0 arrow end
	grestore
end sub


! Need to add triacs, thyristors etc

!===================================
! Op-amps
!===================================
sub opamp supply ulabel$
	gsave
	rline 1 0
	rline 0 1
	rline 3 -2
	rline -3 -2
	rline 0 1
	rline -1 0
	rmove 1 0
	rline 0 2
	! Draw the "-"
	rmove 0.2 0
	rline 0.5 0

	! Draw the "+"
	rmove -0.5 -2
	rline 0.5 0
	rmove -0.25 -0.25
	rline 0 0.5
	rmove -0.25 -0.25
	rmove 2.8 1
	rline 1 0
	rmove -3 0
	set just CC
	set hei 0.8
	write ulabel$
	if supply = 1 then
		rmove 2 0
		rmove -2 4/3
		rline 0 2/3
		rmove 0 -4
		rline 0 2/3
	end if
	grestore
end sub

!===================================
! Power supplies etc
!===================================

! Ground
sub ground
	gsave
	rline 0 -1
	rmove -0.75 0
	rline 1.5 0
	rmove -0.25 -0.25
	rline -1 0
	rmove 0.25 -0.25
	rline 0.5 0
	grestore
end sub

! Power connection
sub power label$
	gsave
	rline 0 1
	rline -0.25 -0.25
	rmove 0.5 0
	rline -0.25 0.25
	rmove 0.1 0.1
	set just BL
	write label$
	grestore
end sub

sub supply_centre type
	if type = 1 then
		! Supply with voltage
		rmove 0 -0.6
		rline 0 1.2 arrow end
		rmove 0 -0.6
	end if
	if type = 2 then
		! +/- Supply
		rmove 0 0.5
		rline 0.25 0
		rmove -0.25 0
		rline -0.25 0
		rmove 0.25 0
		rline 0 0.25
		rmove 0 -0.25
		rline 0 -0.25
		rmove 0 0.25

		rmove 0 -1
		rmove -0.25 0
		rline 0.5 0
		rmove -0.25 0.5
	end if
	if type = 3 then
		! Sine source
		rmove -0.5 0
		rbezier 0.25 0.5 0.25 0.5 0.5 0
		rbezier 0.25 -0.5 0.25 -0.5 0.5 0
		rmove -0.5 0
	end if
end sub

! Horizontal Power supply
sub supply_h type
	! Type gives central drawing
	! 0: Nothing
	! 1: Voltage Arrow
	! 2: +/-
	! 3: Crude Sinusoid
	gsave
	rline 1 0
	rmove 1 0
	circle 1
	begin rotate -90
		@supply_centre type
	end rotate
	rmove 1 0
	rline 1 0
	grestore
	rmove 4 0
end sub

! Vertical Power supply (probably more usual)
sub supply_v type
	! Type gives central drawing
	! 0: Nothing
	! 1: Voltage Arrow
	! 2: +/-
	! 3: Crude Sinusoid
	gsave
	rline 0 -1
	rmove 0 -1
	circle 1
	@supply_centre type
	rmove 0 -1
	rline 0 -1
	grestore
	rmove 0 -4
end sub

!===================================
! Cells
!===================================

! Base cell
sub cell
	gsave
	rline 1.8 0
	rmove 0 -1
	rline 0 2
	rmove 0.4 -1
	gsave
	set lwidth 0.2
	rmove 0 -0.5
	rline 0 1
	rmove 0 -0.5
	grestore
!	set lwidth 0.02
	rline 1.8 0
	grestore
end sub

! Horizontal cell (perhaps should have hr & hl?)
sub cell_h elabel$
	gsave
	@cell
	rmove 2 1.25
	set just BC
	set hei 0.8
	write elabel$
	grestore
	rmove 4 0
end sub

! Vertical cell
sub cell_v elabel$
	gsave
	begin rotate -90
		@cell
	end rotate
	rmove 1.25 -2
	set just LC
	set hei 0.8
	write elabel$
	grestore
	rmove 0 -4
end sub

!===================================
! Logic Gates
!===================================

! Left side of gate (for and/nand)
sub and_left_gate
	gsave
	rmove 0 1
	rline 1 0
	rmove 0 1
	rline 0 -4
	rmove 0 1
	rline -1 0
	grestore
end sub

! Left side of gate (for not/buffer)
sub not_left_gate
	gsave
	rline 1 0
	rmove 0 -2
	rline 0 4
	grestore
end sub

! Curved left gate (for OR)
sub or_left_gate
	gsave
	! Draw the connection lines
	linelength = 1.59
	rmove 0 -1
	rline linelength 0
	rmove 0 2
	rline -linelength 0
	rmove 1 1

	! Draw the curve
	cx = xpos()
	cy = ypos()
	bezier cx+1 cy-1 cx+1 cy-3 cx cy-4
	grestore
end sub

! Double Curved left gate (for XOR)
sub xor_left_gate
	gsave
	! Draw the connection lines
	linelength = 1.09
	rmove 0 -1
	rline linelength 0
	rmove 0 2
	rline -linelength 0
	rmove 1 1

	! Draw the curves
	for i = 0 to 0.5 step 0.5
		rmove -i 0
		cx = xpos()
		cy = ypos()
		bezier cx+1 cy-1 cx+1 cy-3 cx cy-4
		amove cx cy
	next i
	grestore
end sub

! Non-inverted output
sub non_inverted_output
	gsave
	rmove 5 0
	rline 1 0
	grestore
end sub

! Inverted output
sub inverted_output
	gsave
	rmove 5 0
	invrad = 0.25
	rmove invrad 0
	circle invrad
	rmove invrad 0
	rline 1-2*invrad 0
	grestore
end sub

! Curved edges for AND/OR
sub curved_edges
	gsave
	rmove 1 2
	cx = xpos()
	cy = ypos()
	! Draw the top curve
	bezier cx+3 cy cx+4 cy-1 cx+4 cy-2
	! Draw the bottom curve
	cx = xpos()
	cy = ypos()
	bezier cx cy-1 cx-1 cy-2 cx-4 cy-2
	grestore
end sub

! Straight edges for Buffer/Not
sub straight_edges
	gsave
	rmove 1 2
	rline 4 -2
	rline -4 -2
	grestore
end sub

! XOR Gate
sub xor
	gsave
	rmove 0 -1
	@xor_left_gate
	@curved_edges
	@non_inverted_output
	grestore
end sub

! XNOR Gate
sub xnor
	gsave
	rmove 0 -1
	@xor_left_gate
	@curved_edges
	@inverted_output
	grestore
end sub

! OR Gate
sub or
	gsave
	rmove 0 -1
	@or_left_gate
	@curved_edges
	@non_inverted_output
	grestore
end sub

! NOR Gate
sub nor
	gsave
	rmove 0 -1
	@or_left_gate
	@curved_edges
	@inverted_output
	grestore
end sub

! AND Gate
sub and
	gsave
	rmove 0 -1
	@and_left_gate
	@curved_edges
	@non_inverted_output
	grestore
end sub

! NAND Gate
sub nand
	gsave
	rmove 0 -1
	@and_left_gate
	@curved_edges
	@inverted_output
	grestore
end sub

! NOT Gate
sub not
	gsave
	@not_left_gate
	@straight_edges
	@inverted_output
	grestore
	rmove 6 0
end sub

! BUFFER
sub buffer
	gsave
	@not_left_gate
	@straight_edges
	@non_inverted_output
	grestore
	rmove 6 0
end sub

! Schmitt Trigger symbol
sub schmitt
	gsave
	sw = 0.5
	sh = 1
	h = 0.5
	rmove -(sw/2+h) sh/2
	rline h+sw 0
	rline 0 -sh
	rmove h 0
	rline -(h+sw) 0
	rline 0 sh
	grestore
end sub

! NAND Schmitt Trigger
sub nand_schmitt
	gsave
	rmove 2.5 -1
	@schmitt
	grestore
	@nand
end sub

! Inverter Schmitt Trigger
sub not_schmitt
	gsave
	rmove 2.25 0
	@schmitt
	grestore
	@not
end sub