wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: Arrow Shapes wolffd@0: wolffd@0: wolffd@0: wolffd@0:

Arrow Shapes

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wolffd@0: Arrow shapes can be specified and named using the following simple wolffd@0: grammar. wolffd@0: Terminals are shown in bold font and nonterminals in italics. wolffd@0: Literal characters are given in single quotes. wolffd@0: Square brackets [ and ] enclose optional items. wolffd@0: Vertical bars | separate alternatives. wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0:

arrowname	:	aname [ aname [ aname [ aname ] ] ]
aname	:	[ modifiers ] shape
modifiers	:	[ 'o' ] [ side ]
side	:	'l'
	\|	'r'
shape	:	box
	\|	crow
	\|	diamond
	\|	dot
	\|	inv
	\|	none
	\|	normal
	\|	tee
	\|	vee

wolffd@0:

wolffd@0: The primitive shapes are: wolffd@0:

wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0:

"box"	wolffd@0:	"crow"	wolffd@0:	"diamond"	wolffd@0:
"dot"	wolffd@0:	"inv"	wolffd@0:	"none"	wolffd@0:
"normal"	wolffd@0:	"tee"	wolffd@0:	"vee"	wolffd@0:

wolffd@0: wolffd@0:

wolffd@0: As for the modifiers: wolffd@0:

'l' wolffd@0:: Clip the shape, leaving only the part to the left of the edge. wolffd@0:
'r' wolffd@0:: Clip the shape, leaving only the part to the right of the edge. wolffd@0:
'o' wolffd@0:: Use an open (non-filled) version of the shape. wolffd@0:

wolffd@0: Left and right are defined as those directions determined by looking wolffd@0: from the edge towards the point where the arrow "touches" the node. wolffd@0:

wolffd@0: As an example, the arrow shape lteeoldiamond is parsed as wolffd@0: 'l' 'tee' 'o' 'l' 'diamond' and corresponds to the shape wolffd@0:

wolffd@0:

wolffd@0: wolffd@0: Note that the first arrow shape specified occurs closest to the node. wolffd@0: Subsequent arrow shapes, if specified, occur further from the node. wolffd@0:

wolffd@0: Not all syntactically legal combinations of modifiers are meaningful wolffd@0: or semantically valid. wolffd@0: For example, none of the modifiers make any sense with none. wolffd@0: The following table indicates which modifiers are allowed with which shapes. wolffd@0:

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wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0: wolffd@0:

Modifier	box wolffd@0:	crow wolffd@0:	diamond wolffd@0:	dot wolffd@0:	inv wolffd@0:	none wolffd@0:	normal wolffd@0:	tee wolffd@0:	vee wolffd@0:
'l'/'r'	X	X	X		X		X	X	X
'o'	X		X	X	X		X

wolffd@0: wolffd@0:

wolffd@0: This yields 36 different arrow shapes. The optional second, third, fourth shapes wolffd@0: can independently be any of the 36, but since nonenone wolffd@0: is redundant, there are 35**4 + 35**3 + 35**2 + 35 + 1 = 1,544,761 different combinations. wolffd@0:

wolffd@0: The following display contains the 36 combinations possible with a single wolffd@0: arrow shape. The node attached to the arrow is not drawn but would appear wolffd@0: on the right side of the edge. wolffd@0:

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wolffd@0:	wolffd@0:	wolffd@0:	wolffd@0:	wolffd@0:	wolffd@0:
box wolffd@0:	lbox wolffd@0:	rbox wolffd@0:	obox wolffd@0:	olbox wolffd@0:	orbox wolffd@0:
wolffd@0:	wolffd@0:	wolffd@0:
crow wolffd@0:	lcrow wolffd@0:	rcrow wolffd@0:
wolffd@0:	wolffd@0:	wolffd@0:	wolffd@0:	wolffd@0:	wolffd@0:
diamond wolffd@0:	ldiamond wolffd@0:	rdiamond wolffd@0:	odiamond wolffd@0:	oldiamond wolffd@0:	ordiamond wolffd@0:
wolffd@0:	wolffd@0:
dot wolffd@0:	odot wolffd@0:
wolffd@0:	wolffd@0:	wolffd@0:	wolffd@0:	wolffd@0:	wolffd@0:
inv wolffd@0:	linv wolffd@0:	rinv wolffd@0:	oinv wolffd@0:	olinv wolffd@0:	orinv wolffd@0:
wolffd@0:
none wolffd@0:
wolffd@0:	wolffd@0:	wolffd@0:	wolffd@0:	wolffd@0:	wolffd@0:
normal wolffd@0:	lnormal wolffd@0:	rnormal wolffd@0:	onormal wolffd@0:	olnormal wolffd@0:	ornormal wolffd@0:
wolffd@0:	wolffd@0:	wolffd@0:
tee wolffd@0:	ltee wolffd@0:	rtee wolffd@0:
wolffd@0:	wolffd@0:	wolffd@0:
vee wolffd@0:	lvee wolffd@0:	rvee wolffd@0:

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