#############################################################################
# Part of Graph::Easy.
#
#############################################################################
package Graph::Easy::Edge::Cell;
use strict;
use warnings;
use Graph::Easy::Edge;
use Graph::Easy::Attributes;
require Exporter;
use vars qw/$VERSION @EXPORT_OK @ISA/;
@ISA = qw/Exporter Graph::Easy::Edge/;
$VERSION = '0.76';
use Scalar::Util qw/weaken/;
#############################################################################
# The different cell types:
use constant {
EDGE_CROSS => 0, # + crossing lines
EDGE_HOR => 1, # -- horizontal line
EDGE_VER => 2, # | vertical line
EDGE_N_E => 3, # |_ corner (N to E)
EDGE_N_W => 4, # _| corner (N to W)
EDGE_S_E => 5, # ,- corner (S to E)
EDGE_S_W => 6, # -, corner (S to W)
# Joints:
EDGE_S_E_W => 7, # -,- three-sided corner (S to W/E)
EDGE_N_E_W => 8, # -'- three-sided corner (N to W/E)
EDGE_E_N_S => 9, # |- three-sided corner (E to S/N)
EDGE_W_N_S => 10, # -| three-sided corner (W to S/N)
EDGE_HOLE => 11, # a hole (placeholder for the "other"
# edge in a crossing section
# Holes are inserted in the layout stage
# and removed in the optimize stage, before
# rendering occurs.
# these loop types must come last
EDGE_N_W_S => 12, # v--+ loop, northwards
EDGE_S_W_N => 13, # ^--+ loop, southwards
EDGE_E_S_W => 14, # [_ loop, westwards
EDGE_W_S_E => 15, # _] loop, eastwards
EDGE_MAX_TYPE => 15, # last valid type
EDGE_LOOP_TYPE => 12, # first LOOP type
# Flags:
EDGE_START_E => 0x0100, # start from East (sorted ESWN)
EDGE_START_S => 0x0200, # start from South
EDGE_START_W => 0x0400, # start from West
EDGE_START_N => 0x0800, # start from North
EDGE_END_W => 0x0010, # end points to West (sorted WNES)
EDGE_END_N => 0x0020, # end points to North
EDGE_END_E => 0x0040, # end points to East
EDGE_END_S => 0x0080, # end points to South
EDGE_LABEL_CELL => 0x1000, # this cell carries the label
EDGE_SHORT_CELL => 0x2000, # a short edge pice (for filling)
EDGE_ARROW_MASK => 0x0FF0, # mask out the end/start type
EDGE_START_MASK => 0x0F00, # mask out the start type
EDGE_END_MASK => 0x00F0, # mask out the end type
EDGE_TYPE_MASK => 0x000F, # mask out the basic cell type
EDGE_FLAG_MASK => 0xFFF0, # mask out the flags
EDGE_MISC_MASK => 0xF000, # mask out the misc. flags
EDGE_NO_M_MASK => 0x0FFF, # anything except the misc. flags
ARROW_RIGHT => 0,
ARROW_LEFT => 1,
ARROW_UP => 2,
ARROW_DOWN => 3,
};
use constant {
EDGE_ARROW_HOR => EDGE_END_E() + EDGE_END_W(),
EDGE_ARROW_VER => EDGE_END_N() + EDGE_END_S(),
# shortcuts to not need to write EDGE_HOR + EDGE_START_W + EDGE_END_E
EDGE_SHORT_E => EDGE_HOR + EDGE_END_E + EDGE_START_W, # |-> start/end at this cell
EDGE_SHORT_S => EDGE_VER + EDGE_END_S + EDGE_START_N, # v start/end at this cell
EDGE_SHORT_W => EDGE_HOR + EDGE_END_W + EDGE_START_E, # <-| start/end at this cell
EDGE_SHORT_N => EDGE_VER + EDGE_END_N + EDGE_START_S, # ^ start/end at this cell
EDGE_SHORT_BD_EW => EDGE_HOR + EDGE_END_E + EDGE_END_W, # <-> start/end at this cell
EDGE_SHORT_BD_NS => EDGE_VER + EDGE_END_S + EDGE_END_N, # ^
# | start/end at this cell
# v
EDGE_SHORT_UN_EW => EDGE_HOR + EDGE_START_E + EDGE_START_W, # --
EDGE_SHORT_UN_NS => EDGE_VER + EDGE_START_S + EDGE_START_N, # |
EDGE_LOOP_NORTH => EDGE_N_W_S + EDGE_END_S + EDGE_START_N + EDGE_LABEL_CELL,
EDGE_LOOP_SOUTH => EDGE_S_W_N + EDGE_END_N + EDGE_START_S + EDGE_LABEL_CELL,
EDGE_LOOP_WEST => EDGE_W_S_E + EDGE_END_E + EDGE_START_W + EDGE_LABEL_CELL,
EDGE_LOOP_EAST => EDGE_E_S_W + EDGE_END_W + EDGE_START_E + EDGE_LABEL_CELL,
};
#############################################################################
@EXPORT_OK = qw/
EDGE_START_E
EDGE_START_W
EDGE_START_N
EDGE_START_S
EDGE_END_E
EDGE_END_W
EDGE_END_N
EDGE_END_S
EDGE_SHORT_E
EDGE_SHORT_W
EDGE_SHORT_N
EDGE_SHORT_S
EDGE_SHORT_BD_EW
EDGE_SHORT_BD_NS
EDGE_SHORT_UN_EW
EDGE_SHORT_UN_NS
EDGE_HOR
EDGE_VER
EDGE_CROSS
EDGE_HOLE
EDGE_N_E
EDGE_N_W
EDGE_S_E
EDGE_S_W
EDGE_S_E_W
EDGE_N_E_W
EDGE_E_N_S
EDGE_W_N_S
EDGE_LOOP_NORTH
EDGE_LOOP_SOUTH
EDGE_LOOP_EAST
EDGE_LOOP_WEST
EDGE_N_W_S
EDGE_S_W_N
EDGE_E_S_W
EDGE_W_S_E
EDGE_TYPE_MASK
EDGE_FLAG_MASK
EDGE_ARROW_MASK
EDGE_START_MASK
EDGE_END_MASK
EDGE_MISC_MASK
EDGE_LABEL_CELL
EDGE_SHORT_CELL
EDGE_NO_M_MASK
ARROW_RIGHT
ARROW_LEFT
ARROW_UP
ARROW_DOWN
/;
my $edge_types = {
EDGE_HOR() => 'horizontal',
EDGE_VER() => 'vertical',
EDGE_CROSS() => 'crossing',
EDGE_N_E() => 'north/east corner',
EDGE_N_W() => 'north/west corner',
EDGE_S_E() => 'south/east corner',
EDGE_S_W() => 'south/west corner',
EDGE_S_E_W() => 'joint south to east/west',
EDGE_N_E_W() => 'joint north to east/west',
EDGE_E_N_S() => 'joint east to north/south',
EDGE_W_N_S() => 'joint west to north/south',
EDGE_N_W_S() => 'selfloop, northwards',
EDGE_S_W_N() => 'selfloop, southwards',
EDGE_E_S_W() => 'selfloop, eastwards',
EDGE_W_S_E() => 'selfloop, westwards',
};
my $flag_types = {
EDGE_LABEL_CELL() => 'labeled',
EDGE_SHORT_CELL() => 'short',
EDGE_START_E() => 'starting east',
EDGE_START_W() => 'starting west',
EDGE_START_N() => 'starting north',
EDGE_START_S() => 'starting south',
EDGE_END_E() => 'ending east',
EDGE_END_W() => 'ending west',
EDGE_END_N() => 'ending north',
EDGE_END_S() => 'ending south',
};
use constant isa_cell => 1;
sub edge_type
{
# convert edge type number to some descriptive text
my $type = shift;
my $flags = $type & EDGE_FLAG_MASK;
$type &= EDGE_TYPE_MASK;
my $t = $edge_types->{$type} || ('unknown edge type #' . $type);
$flags &= EDGE_FLAG_MASK;
my $mask = 0x0010;
while ($mask < 0xFFFF)
{
my $tf = $flags & $mask; $mask <<= 1;
$t .= ", $flag_types->{$tf}" if $tf != 0;
}
$t;
}
#############################################################################
sub _init
{
# generic init, override in subclasses
my ($self,$args) = @_;
$self->{type} = EDGE_SHORT_E(); # -->
$self->{style} = 'solid';
$self->{x} = 0;
$self->{y} = 0;
$self->{w} = undef;
$self->{h} = 3;
foreach my $k (sort keys %$args)
{
# don't store "after" and "before"
next unless $k =~ /^(graph|edge|x|y|type)\z/;
$self->{$k} = $args->{$k};
}
$self->_croak("Creating edge cell without a parent edge object")
unless defined $self->{edge};
$self->_croak("Creating edge cell without a type")
unless defined $self->{type};
# take over settings from edge
$self->{style} = $self->{edge}->style();
$self->{class} = $self->{edge}->class();
$self->{graph} = $self->{edge}->{graph};
$self->{group} = $self->{edge}->{group};
weaken($self->{graph});
weaken($self->{group});
$self->{att} = $self->{edge}->{att};
# register ourselves at this edge
$self->{edge}->_add_cell ($self, $args->{after}, $args->{before});
$self;
}
sub arrow_count
{
# return 0, 1 or 2, depending on the number of end points
my $self = shift;
return 0 if $self->{edge}->{undirected};
my $count = 0;
my $type = $self->{type};
$count ++ if ($type & EDGE_END_N) != 0;
$count ++ if ($type & EDGE_END_S) != 0;
$count ++ if ($type & EDGE_END_W) != 0;
$count ++ if ($type & EDGE_END_E) != 0;
if ($self->{edge}->{bidirectional})
{
$count ++ if ($type & EDGE_START_N) != 0;
$count ++ if ($type & EDGE_START_S) != 0;
$count ++ if ($type & EDGE_START_W) != 0;
$count ++ if ($type & EDGE_START_E) != 0;
}
$count;
}
sub _make_cross
{
# Upgrade us to a cross-section.
my ($self, $edge, $flags) = @_;
my $type = $self->{type} & EDGE_TYPE_MASK;
$self->_croak("Trying to cross non hor/ver piece at $self->{x},$self->{y}")
if (($type != EDGE_HOR) && ($type != EDGE_VER));
$self->{color} = $self->get_color_attribute('color');
$self->{style_ver} = $edge->style();
$self->{color_ver} = $edge->get_color_attribute('color');
# if we are the VER piece, switch styles around
if ($type == EDGE_VER)
{
($self->{style_ver}, $self->{style}) = ($self->{style},$self->{style_ver});
($self->{color_ver}, $self->{color}) = ($self->{color},$self->{color});
}
$self->{type} = EDGE_CROSS + ($flags || 0);
$self;
}
sub _make_joint
{
# Upgrade us to a joint
my ($self, $edge, $new_type) = @_;
my $type = $self->{type} & EDGE_TYPE_MASK;
$self->_croak("Trying to join non hor/ver piece (type: $type) at $self->{x},$self->{y}")
if $type >= EDGE_S_E_W;
$self->{color} = $self->get_color_attribute('color');
$self->{style_ver} = $edge->style();
$self->{color_ver} = $edge->get_color_attribute('color');
# if we are the VER piece, switch styles around
if ($type == EDGE_VER)
{
($self->{style_ver}, $self->{style}) = ($self->{style},$self->{style_ver});
($self->{color_ver}, $self->{color}) = ($self->{color},$self->{color});
}
print STDERR "# creating joint at $self->{x}, $self->{y} with new type $new_type (old $type)\n"
if $self->{graph}->{debug};
$self->{type} = $new_type;
$self;
}
#############################################################################
# conversion to HTML
my $edge_end_north =
' <td colspan=2 class="##class## eb" style="##bg####ec##"> </td>' . "\n" .
' <td colspan=2 class="##class## eb" style="##bg####ec##"><span class="su">^</span></td>' . "\n";
my $edge_end_south =
' <td colspan=2 class="##class## eb" style="##bg####ec##"> </td>' . "\n" .
' <td colspan=2 class="##class## eb" style="##bg####ec##"><span class="sv">v</span></td>' . "\n";
my $edge_empty_row =
' <td colspan=4 class="##class## eb"></td>';
my $edge_arrow_west_upper =
'<td rowspan=2 class="##class## eb" style="##ec####bg##"><span class="shl"><</span></td>' . "\n";
my $edge_arrow_west_lower =
'<td rowspan=2 class="##class## eb"> </td>' . "\n";
my $edge_arrow_east_upper =
'<td rowspan=2 class="##class## eb" style="##ec####bg##"><span class="sh">></span></td>' . "\n";
my $edge_arrow_east_lower =
'<td rowspan=2 class="##class## eb"></td>' . "\n";
my $edge_html = {
# The " " in empty table cells with borders are here to make IE display
# the border. I so hate browser bugs :-(
EDGE_S_E() => [
' <td colspan=2 rowspan=2 class="##class## eb"></td>' . "\n" .
' <td colspan=2 rowspan=2 class="##class## eb" style="border-bottom: ##border##;"> </td>',
'',
' <td colspan=2 rowspan=2 class="##class## eb"></td>'. "\n" .
' <td colspan=2 rowspan=2 class="##class## eb" style="border-left: ##border##;"> </td>',
'',
],
EDGE_S_E() + EDGE_START_E() + EDGE_END_S() => [
' <td colspan=2 rowspan=2 class="##class## eb"></td>' . "\n" .
' <td rowspan=2 class="##class## eb" style="border-bottom: ##border##;"> </td>' . "\n" .
' <td rowspan=4 class="##class## el"></td>',
'',
' <td colspan=2 class="##class## eb"></td>'. "\n" .
' <td class="##class## eb" style="border-left: ##border##;"> </td>',
$edge_end_south,
],
EDGE_S_E() + EDGE_START_E() => [
' <td colspan=2 rowspan=2 class="##class## eb"></td>' . "\n" .
' <td rowspan=2 class="##class## eb" style="border-bottom: ##border##;"> </td>' . "\n" .
' <td rowspan=4 class="##class## el"></td>',
'',
' <td colspan=2 rowspan=2 class="##class## eb"></td>'. "\n" .
' <td colspan=2 rowspan=2 class="##class## eb" style="border-left: ##border##;"> </td>',
'',
],
EDGE_S_E() + EDGE_END_E() => [
' <td colspan=2 rowspan=2 class="##class## eb"></td>' . "\n" .
' <td rowspan=2 class="##class## eb" style="border-bottom: ##border##;"> </td>' . "\n" .
' <td rowspan=4 class="##class##"##edgecolor##><span class="sa">></span></td>',
'',
' <td colspan=2 rowspan=2 class="##class## eb"></td>'. "\n" .
' <td rowspan=2 class="##class## eb" style="border-left: ##border##;"> </td>',
'',
],
EDGE_S_E() + EDGE_START_S() => [
' <td colspan=2 rowspan=2 class="##class## eb"></td>' . "\n" .
' <td colspan=2 rowspan=2 class="##class## eb" style="border-bottom: ##border##;"> </td>',
'',
' <td colspan=2 class="##class## eb"></td>'. "\n" .
' <td colspan=2 class="##class## eb" style="border-left: ##border##;"> </td>' . "\n",
$edge_empty_row,
],
EDGE_S_E() + EDGE_START_S() + EDGE_END_E() => [
' <td colspan=2 rowspan=2 class="##class## eb"></td>' . "\n" .
' <td rowspan=2 class="##class## eb" style="border-bottom: ##border##;"> </td>'.
' <td rowspan=4 class="##class##"##edgecolor##><span class="sa">></span></td>',
'',
' <td colspan=2 rowspan=2 class="##class## eb"></td>'. "\n" .
' <td class="##class## eb" style="border-left: ##border##;"> </td>' . "\n",
' <td class="##class## eb"></td>',
],
EDGE_S_E() + EDGE_END_S() => [
' <td colspan=2 rowspan=2 class="##class## eb"></td>' . "\n" .
' <td colspan=2 rowspan=2 class="##class## eb" style="border-bottom: ##border##;"> </td>',
'',
' <td colspan=2 class="##class## eb"></td>'. "\n" .
' <td colspan=2 class="##class## eb" style="border-left: ##border##;"> </td>' . "\n",
$edge_end_south,
],
EDGE_S_E() + EDGE_END_S() + EDGE_END_E() => [
' <td colspan=2 rowspan=2 class="##class## eb"></td>' . "\n" .
' <td rowspan=2 class="##class## eb" style="border-bottom: ##border##;"> </td>' . "\n" .
' <td rowspan=4 class="##class## ha"##edgecolor##><span class="sa">></span></td>',
'',
' <td colspan=2 class="##class## eb"></td>'. "\n" .
' <td class="##class## eb" style="border-left: ##border##;"> </td>' . "\n",
' <td colspan=3 class="##class## v"##edgecolor##>v</td>',
],
###########################################################################
###########################################################################
# S_W
EDGE_S_W() => [
' <td colspan=2 rowspan=2 class="##class## eb" style="border-bottom: ##border##;"> </td>' . "\n" .
' <td colspan=2 rowspan=2 class="##class## eb"></td>',
'',
' <td colspan=2 rowspan=2 class="##class## eb"></td>'. "\n" .
' <td colspan=2 rowspan=2 class="##class## eb" style="border-left: ##border##;"> </td>',
'',
],
EDGE_S_W() + EDGE_START_W() => [
' <td rowspan=2 class="##class## el"></td>' . "\n" .
' <td rowspan=2 class="##class## eb" style="border-bottom: ##border##;"> </td>' . "\n" .
' <td colspan=2 rowspan=2 class="##class## eb"></td>',
'',
' <td colspan=2 rowspan=2 class="##class## eb"></td>'. "\n" .
' <td colspan=2 rowspan=2 class="##class## eb" style="border-left: ##border##;"> </td>',
'',
],
EDGE_S_W() + EDGE_END_W() => [
' <td rowspan=2 class="##class## va"##edgecolor##><span class="shl"><</span></td>' . "\n" .
' <td rowspan=2 class="##class## eb" style="border-bottom: ##border##;"> </td>' . "\n" .
' <td colspan=2 rowspan=2 class="##class## eb"></td>',
'',
' <td colspan=2 rowspan=2 class="##class## eb"></td>'. "\n" .
' <td colspan=2 rowspan=2 class="##class## eb" style="border-left: ##border##;"> </td>',
'',
],
EDGE_S_W() + EDGE_START_S() => [
' <td colspan=2 rowspan=2 class="##class## eb" style="border-bottom: ##border##;"> </td>' . "\n" .
' <td colspan=2 rowspan=2 class="##class## eb"></td>',
'',
' <td colspan=2 class="##class## eb"></td>'. "\n" .
' <td colspan=2 class="##class## eb" style="border-left: ##border##;"> </td>',
$edge_empty_row,
],
EDGE_S_W() + EDGE_END_S() => [
' <td colspan=2 rowspan=2 class="##class## eb" style="border-bottom: ##border##;"> </td>' . "\n" .
' <td colspan=2 rowspan=2 class="##class## eb"></td>',
'',
' <td colspan=2 class="##class## eb"></td>'. "\n" .
' <td colspan=2 class="##class## eb" style="border-left: ##border##;"> </td>',
$edge_end_south,
],
EDGE_S_W() + EDGE_START_W() + EDGE_END_S() => [
' <td rowspan=2 class="##class## el"></td>' . "\n" .
' <td rowspan=2 class="##class## eb" style="border-bottom: ##border##;"> </td>' . "\n" .
' <td colspan=2 rowspan=2 class="##class## eb"></td>',
'',
' <td colspan=2 class="##class## eb"></td>'. "\n" .
' <td colspan=2 class="##class## eb" style="border-left: ##border##;"> </td>',
$edge_end_south,
],
EDGE_S_W() + EDGE_START_S() + EDGE_END_W() => [
' <td rowspan=3 class="##class## sh"##edgecolor##><</td>' . "\n" .
' <td rowspan=2 class="##class## eb" style="border-bottom: ##border##;"> </td>' . "\n" .
' <td colspan=2 rowspan=2 class="##class## eb"></td>',
'',
' <td class="##class## eb"></td>'. "\n" .
' <td colspan=2 class="##class## eb" style="border-left: ##border##;"> </td>',
$edge_empty_row,
],
###########################################################################
###########################################################################
# N_W
EDGE_N_W() => [
' <td colspan=2 rowspan=2 class="##class## eb" style="border-bottom: ##border##;"> </td>' . "\n" .
' <td colspan=2 rowspan=2 class="##class## eb" style="border-left: ##border##;"> </td>',
'',
' <td colspan=4 rowspan=2 class="##class## eb"></td>',
'',
],
EDGE_N_W() + EDGE_START_N() => [
$edge_empty_row,
' <td colspan=2 class="##class## eb" style="border-bottom: ##border##;"> </td>' . "\n" .
' <td colspan=2 class="##class## eb" style="border-left: ##border##;"> </td>',
'',
' <td colspan=4 rowspan=2 class="##class## eb"></td>',
],
EDGE_N_W() + EDGE_END_N() => [
$edge_end_north,
' <td colspan=2 class="##class## eb" style="border-bottom: ##border##;"> </td>' . "\n" .
' <td colspan=2 class="##class## eb" style="border-left: ##border##;"> </td>',
' <td colspan=4 rowspan=2 class="##class## eb"></td>',
'',
],
EDGE_N_W() + EDGE_END_N() + EDGE_START_W() => [
$edge_end_north,
' <td rowspan=3 class="##class## eb"></td>'.
' <td class="##class## eb" style="border-bottom: ##border##;"> </td>' . "\n" .
' <td colspan=2 class="##class## eb" style="border-left: ##border##;"> </td>',
' <td colspan=4 rowspan=2 class="##class## eb"></td>',
'',
],
EDGE_N_W() + EDGE_START_W() => [
' <td rowspan=2 class="##class## el"></td>' . "\n" .
' <td rowspan=2 class="##class## eb" style="border-bottom: ##border##;"> </td>' . "\n" .
' <td colspan=2 rowspan=2 class="##class## eb" style="border-left: ##border##;"> </td>' . "\n",
'',
' <td colspan=4 rowspan=2 class="##class## eb"></td>',
'',
],
EDGE_N_W() + EDGE_END_W() => [
' <td rowspan=4 class="##class## sh"##edgecolor##><</td>' . "\n" .
' <td rowspan=2 class="##class## eb" style="border-bottom: ##border##;"> </td>' . "\n" .
' <td colspan=2 rowspan=2 class="##class## eb" style="border-left: ##border##;"> </td>' . "\n",
'',
' <td colspan=3 rowspan=2 class="##class## eb"></td>',
'',
],
###########################################################################
###########################################################################
# N_E
EDGE_N_E() => [
' <td colspan=2 rowspan=2 class="##class## eb"></td>' . "\n" .
' <td colspan=2 rowspan=2 class="##class## eb" style="border-bottom: ##border##; border-left: ##border##;"> </td>',
'',
' <td colspan=4 rowspan=2 class="##class## eb"></td>',
'',
],
EDGE_N_E() + EDGE_START_E() => [
' <td colspan=2 rowspan=2 class="##class## eb"></td>' . "\n" .
' <td rowspan=2 class="##class## eb" style="border-bottom: ##border##; border-left: ##border##;"> </td>' . "\n" .
' <td rowspan=4 class="##class## el"></td>',
'',
' <td colspan=3 rowspan=2 class="##class## eb"></td>',
'',
],
EDGE_N_E() + EDGE_END_E() => [
' <td colspan=2 rowspan=2 class="##class## eb"></td>' . "\n" .
' <td rowspan=2 class="##class## eb" style="border-bottom: ##border##; border-left: ##border##;"> </td>' . "\n" .
' <td rowspan=4 class="##class## va"##edgecolor##><span class="sa">></span></td>',
'',
' <td colspan=3 rowspan=2 class="##class## eb"></td>',
'',
],
EDGE_N_E() + EDGE_END_E() + EDGE_START_N() => [
$edge_empty_row,
' <td colspan=2 class="##class## eb"></td>' . "\n" .
' <td class="##class## eb" style="border-bottom: ##border##; border-left: ##border##;"> </td>' . "\n" .
' <td rowspan=3 class="##class## va"##edgecolor##><span class="sa">></span></td>',
' <td colspan=3 rowspan=2 class="##class## eb"></td>',
'',
],
EDGE_N_E() + EDGE_START_E() + EDGE_END_N() => [
$edge_end_north,
' <td colspan=2 class="##class## eb"></td>' . "\n" .
' <td class="##class## eb" style="border-bottom: ##border##; border-left: ##border##;"> </td>' . "\n" .
' <td rowspan=3 class="##class## eb"> </td>',
' <td colspan=3 rowspan=2 class="##class## eb"></td>',
'',
],
EDGE_N_E() + EDGE_START_N() => [
$edge_empty_row,
' <td colspan=2 rowspan=3 class="##class## eb"></td>' . "\n" .
' <td colspan=2 class="##class## eb" style="border-bottom: ##border##; border-left: ##border##;"> </td>',
' <td colspan=2 class="##class## eb"></td>',
'',
],
EDGE_N_E() + EDGE_END_N() => [
$edge_end_north,
' <td colspan=2 rowspan=3 class="##class## eb"></td>' . "\n" .
' <td colspan=2 class="##class## eb" style="border-bottom: ##border##; border-left: ##border##;"> </td>',
'',
' <td colspan=2 class="##class## eb"></td>',
],
###########################################################################
###########################################################################
# self loops
EDGE_LOOP_NORTH() - EDGE_LABEL_CELL() => [
'<td rowspan=2 class="##class## eb"> </td>' . "\n".
' <td colspan=2 rowspan=2 class="##class## lh" style="border-bottom: ##border##;##lc####bg##">##label##</td>' . "\n" .
' <td rowspan=2 class="##class## eb"> </td>',
'',
'<td class="##class## eb"> </td>' . "\n".
' <td colspan=2 class="##class## eb" style="border-left: ##border##;##bg##"> </td>'."\n".
' <td class="##class## eb" style="border-left: ##border##;##bg##"> </td>',
'<td colspan=2 class="##class## v" style="##bg##"##edgecolor##>v</td>' . "\n" .
' <td colspan=2 class="##class## eb"> </td>',
],
EDGE_LOOP_SOUTH() - EDGE_LABEL_CELL() => [
'<td colspan=2 class="##class## v" style="##bg##"##edgecolor##>^</td>' . "\n" .
' <td colspan=2 class="##class## eb"> </td>',
'<td rowspan=2 class="##class## eb"> </td>' . "\n".
' <td colspan=2 rowspan=2 class="##class## lh" style="border-left:##border##;border-bottom:##border##;##lc####bg##">##label##</td>'."\n".
' <td rowspan=2 class="##class## eb" style="border-left:##border##;##bg##"> </td>',
'',
'<td colspan=4 class="##class## eb"> </td>',
],
EDGE_LOOP_WEST() - EDGE_LABEL_CELL() => [
$edge_empty_row.
' <td colspan=2 rowspan=2 class="##class## lh" style="border-bottom: ##border##;##lc####bg##">##label##</td>'."\n".
' <td rowspan=2 class="##class## eb"> </td>',
'',
'<td colspan=2 class="##class## eb" style="border-left: ##border##; border-bottom: ##border##;##bg##"> </td>' . "\n".
' <td rowspan=2 class="##class## va" style="##bg##"##edgecolor##><span class="sa">></span></td>',
'<td colspan=2 class="##class## eb"> </td>',
],
EDGE_LOOP_EAST() - EDGE_LABEL_CELL() => [
'<td rowspan=2 class="##class## eb"> </td>' . "\n" .
' <td colspan=2 rowspan=2 class="##class## lh" style="border-bottom: ##border##;##lc####bg##">##label##</td>' ."\n".
' <td rowspan=2 class="##class## eb"> </td>',
'',
'<td rowspan=2 class="##class## va" style="##bg##"##edgecolor##><span class="sh"><</span></td>' ."\n".
' <td colspan=2 class="##class## eb" style="border-bottom: ##border##;##bg##"> </td>'."\n".
' <td class="##class## eb" style="border-left: ##border##;##bg##"> </td>',
'<td colspan=3 class="##class## eb"> </td>',
],
###########################################################################
###########################################################################
# joints
###########################################################################
# E_N_S
EDGE_E_N_S() => [
'<td colspan=2 rowspan=2 class="##class## eb"> </td>' . "\n" .
' <td colspan=2 rowspan=2 class="##class## eb" style="border-left:##borderv##;border-bottom:##border##;##bg##"> </td>',
'',
'<td colspan=2 rowspan=2 class="##class## eb"> </td>' ."\n".
' <td colspan=2 rowspan=2 class="##class## eb" style="border-left: ##borderv##;##bg##"> </td>',
'',
],
EDGE_E_N_S() + EDGE_END_E() => [
'<td colspan=2 rowspan=2 class="##class## eb"> </td>' . "\n" .
' <td rowspan=2 class="##class## eb" style="border-left: ##borderv##; border-bottom: ##border##;##bg##"> </td>' . "\n" .
' <td rowspan=4 class="##class## va"##edgecolor##><span class="sa">></span></td>',
'',
'<td colspan=2 rowspan=2 class="##class## eb"> </td>' ."\n".
' <td rowspan=2 class="##class## eb" style="border-left: ##borderv##;##bg##"> </td>',
'',
],
###########################################################################
# W_N_S
EDGE_W_N_S() => [
'<td colspan=2 rowspan=2 class="##class## eb" style="border-bottom: ##border##;##bg##"> </td>' . "\n" .
' <td colspan=2 rowspan=4 class="##class## eb" style="border-left: ##borderv##;##bg##"> </td>',
'',
'<td colspan=2 rowspan=2 class="##class## eb"> </td>',
'',
],
###########################################################################
# S_E_W
EDGE_S_E_W() => [
'<td colspan=4 rowspan=2 class="##class## eb" style="border-bottom: ##border##;##bg##"> </td>',
'',
'<td colspan=2 rowspan=2 class="##class## eb"> </td>' ."\n".
' <td colspan=2 rowspan=2 class="##class## eb" style="border-left: ##borderv##;##bg##"> </td>',
'',
],
EDGE_S_E_W() + EDGE_END_S() => [
'<td colspan=4 rowspan=2 class="##class## eb" style="border-bottom: ##border##;##bg##"> </td>',
'',
'<td colspan=2 class="##class## eb"> </td>' ."\n".
' <td colspan=2 class="##class## eb" style="border-left: ##borderv##;##bg##"> </td>',
$edge_end_south,
],
EDGE_S_E_W() + EDGE_START_S() => [
'<td colspan=4 rowspan=2 class="##class## eb" style="border-bottom: ##border##;##bg##"> </td>',
'',
'<td colspan=2 class="##class## eb"> </td>' ."\n".
' <td colspan=2 class="##class## eb" style="border-left: ##borderv##;##bg##"> </td>',
' <td colspan=4 class="##class## eb"></td>',
],
EDGE_S_E_W() + EDGE_START_W() => [
'<td rowspan=4 class="##class## el"></td>' . "\n" .
'<td colspan=3 rowspan=2 class="##class## eb" style="border-bottom: ##border##;##bg##"> </td>',
'',
'<td rowspan=2 class="##class## eb"> </td>' ."\n".
' <td rowspan=2 class="##class## eb" style="border-left: ##borderv##;##bg##"> </td>',
'',
],
EDGE_S_E_W() + EDGE_END_E() => [
'<td colspan=3 rowspan=2 class="##class## eb" style="border-bottom: ##border##;##bg##"> </td>' . "\n" .
' <td rowspan=4 class="##class## va"##edgecolor##><span class="sa">></span></td>',
'',
'<td colspan=2 rowspan=2 class="##class## eb"> </td>' ."\n".
' <td rowspan=2 class="##class## eb" style="border-left: ##borderv##;##bg##"> </td>',
'',
],
EDGE_S_E_W() + EDGE_END_W() => [
$edge_arrow_west_upper .
'<td colspan=3 rowspan=2 class="##class## eb" style="border-bottom: ##border##;##bg##"> </td>' . "\n" ,
'',
'<td colspan=2 rowspan=2 class="##class## eb"> </td>' ."\n" .
'<td colspan=2 rowspan=2 class="##class## eb" style="border-left: ##borderv##;##bg##"> </td>',
],
###########################################################################
# N_E_W
EDGE_N_E_W() => [
' <td colspan=2 rowspan=2 class="##class## eb" style="border-bottom: ##borderv##;##bg##"> </td>' ."\n".
'<td colspan=2 rowspan=2 class="##class## eb" style="border-left: ##borderv##; border-bottom: ##border##;##bg##"> </td>',
'',
'<td colspan=4 rowspan=2 class="##class## eb"> </td>',
'',
],
EDGE_N_E_W() + EDGE_END_N() => [
$edge_end_north,
' <td colspan=2 class="##class## eb" style="border-bottom: ##borderv##;##bg##"> </td>' ."\n".
'<td colspan=2 class="##class## eb" style="border-left: ##borderv##; border-bottom: ##border##;##bg##"> </td>',
'',
'<td colspan=4 rowspan=2 class="##class## eb"> </td>',
'',
],
EDGE_N_E_W() + EDGE_START_N() => [
$edge_empty_row,
' <td colspan=2 class="##class## eb" style="border-bottom: ##borderv##;##bg##"> </td>' ."\n".
'<td colspan=2 class="##class## eb" style="border-left: ##borderv##; border-bottom: ##border##;##bg##"> </td>',
'',
'<td colspan=4 rowspan=2 class="##class## eb"> </td>',
'',
],
};
sub _html_edge_hor
{
# Return HTML code for a horizontal edge (with all start/end combinations)
# as [], with code for each table row.
my ($self, $as) = @_;
my $s_flags = $self->{type} & EDGE_START_MASK;
my $e_flags = $self->{type} & EDGE_END_MASK;
$e_flags = 0 if $as eq 'none';
# XXX TODO: we could skip the output of "eb" parts when this edge doesn't belong
# to a group.
my $rc = [
' <td colspan=##mod## rowspan=2 class="##class## lh" style="border-bottom: ##border##;##lc####bg##">##label##</td>',
'',
'<td colspan=##mod## rowspan=2 class="##class## eb"> </td>',
'',
];
# This assumes that only 2 end/start flags are set at the same time:
my $mod = 4; # modifier
if ($s_flags & EDGE_START_W)
{
$mod--;
$rc->[0] = '<td rowspan=4 class="##class## el"></td>' . "\n" . $rc->[0];
};
if ($s_flags & EDGE_START_E)
{
$mod--;
$rc->[0] .= "\n " . '<td rowspan=4 class="##class## el"></td>';
};
if ($e_flags & EDGE_END_W)
{
$mod--;
$rc->[0] = $edge_arrow_west_upper . $rc->[0];
$rc->[2] = $edge_arrow_west_lower . $rc->[2];
}
if ($e_flags & EDGE_END_E)
{
$mod--;
$rc->[0] .= "\n " . $edge_arrow_east_upper;
$rc->[2] .= "\n " . $edge_arrow_east_lower;
};
# cx == 1: mod = 2..4, cx == 2: mod = 6..8, etc.
$self->{cx} ||= 1;
$mod = $self->{cx} * 4 - 4 + $mod;
for my $e (@$rc)
{
$e =~ s/##mod##/$mod/g;
}
$rc;
}
sub _html_edge_ver
{
# Return HTML code for a vertical edge (with all start/end combinations)
# as [], with code for each table row.
my ($self, $as) = @_;
my $s_flags = $self->{type} & EDGE_START_MASK;
my $e_flags = $self->{type} & EDGE_END_MASK;
$e_flags = 0 if $as eq 'none';
my $mod = 4; # modifier
# normal vertical edge with no start/end flags
my $rc = [
'<td colspan=2 rowspan=##mod## class="##class## el"> </td>' . "\n " .
'<td colspan=2 rowspan=##mod## class="##class## lv" style="border-left: ##border##;##lc####bg##">##label##</td>' . "\n",
'',
'',
'',
];
# flag north
if ($s_flags & EDGE_START_N)
{
$mod--;
unshift @$rc, '<td colspan=4 class="##class## eb"></td>' . "\n";
delete $rc->[-1];
}
elsif ($e_flags & EDGE_END_N)
{
$mod--;
unshift @$rc, $edge_end_north;
delete $rc->[-1];
}
# flag south
if ($s_flags & EDGE_START_S)
{
$mod--;
$rc->[3] = '<td colspan=4 class="##class## eb"></td>' . "\n"
}
if ($e_flags & EDGE_END_S)
{
$mod--;
$rc->[3] = $edge_end_south;
}
$self->{cy} ||= 1;
$mod = $self->{cy} * 4 - 4 + $mod;
for my $e (@$rc)
{
$e =~ s/##mod##/$mod/g;
}
$rc;
}
sub _html_edge_cross
{
# Return HTML code for a crossingedge (with all start/end combinations)
# as [], with code for each table row.
my ($self, $N, $S, $E, $W) = @_;
# my $s_flags = $self->{type} & EDGE_START_MASK;
# my $e_flags = $self->{type} & EDGE_END_MASK;
my $rc = [
' <td colspan=2 rowspan=2 class="##class## eb el" style="border-bottom: ##border##"> </td>' . "\n" .
' <td colspan=2 rowspan=2 class="##class## eb el" style="border-left: ##borderv##; border-bottom: ##border##"> </td>' . "\n",
'',
' <td colspan=2 rowspan=2 class="##class## eb el"></td>' . "\n" .
' <td colspan=2 rowspan=2 class="##class## eb el" style="border-left: ##borderv##"> </td>' . "\n",
'',
];
$rc;
}
sub as_html
{
my ($self) = shift;
my $type = $self->{type} & EDGE_NO_M_MASK;
my $style = $self->{style};
# none, open, filled, closed
my $as; $as = 'none' if $self->{edge}->{undirected};
$as = $self->attribute('arrowstyle') unless $as;
# triangle, box, dot, inv, diamond, line etc.
my $ashape; $ashape = 'triangle' if $self->{edge}->{undirected};
$ashape = $self->attribute('arrowshape') unless $ashape;
my $code = $edge_html->{$type};
if (!defined $code)
{
my $t = $self->{type} & EDGE_TYPE_MASK;
if ($style ne 'invisible')
{
$code = $self->_html_edge_hor($as) if $t == EDGE_HOR;
$code = $self->_html_edge_ver($as) if $t == EDGE_VER;
$code = $self->_html_edge_cross($as) if $t == EDGE_CROSS;
}
else
{
$code = [ ' <td colspan=4 rowspan=4 class="##class##"> </td>' ];
}
if (!defined $code)
{
$code = [ ' <td colspan=4 rowspan=4 class="##class##">???</td>' ];
warn ("as_html: Unimplemented edge type $self->{type} ($type) at $self->{x},$self->{y} "
. edge_type($self->{type}));
}
}
my $id = $self->{graph}->{id};
my $color = $self->get_color_attribute('color');
my $label = '';
my $label_style = '';
# only include the label if we are the label cell
if ($style ne 'invisible' && ($self->{type} & EDGE_LABEL_CELL))
{
my $switch_to_center;
($label,$switch_to_center) = $self->_label_as_html();
# replace linebreaks by <br>, but remove extra spaces
$label =~ s/\s*\\n\s*/<br \/>/g;
my $label_color = $self->raw_color_attribute('labelcolor') || $color;
$label_color = '' if $label_color eq '#000000';
$label_style = "color: $label_color;" if $label_color;
my $font = $self->attribute('font') || '';
$font = '' if $font eq ($self->default_attribute('font') || '');
$label_style = "font-family: $font;" if $font;
$label_style .= $self->text_styles_as_css(1,1) unless $label eq '';
$label_style =~ s/^\s*//;
my $link = $self->link();
if ($link ne '')
{
# encode critical entities
$link =~ s/\s/\+/g; # space
$link =~ s/'/%27/g; # single-quote
# put the style on the link
$label_style = " style='$label_style'" if $label_style;
$label = "<a href='$link'$label_style>$label</a>";
$label_style = '';
}
}
# without , IE doesn't draw the cell-border nec. for edges
$label = ' ' unless $label ne '';
###########################################################################
# get the border styles/colors:
# width for the edge is "2px"
my $bow = '2';
my $border = Graph::Easy::_border_attribute_as_html( $self->{style}, $bow, $color);
my $border_v = $border;
if (($self->{type} & EDGE_TYPE_MASK) == EDGE_CROSS)
{
$border_v = Graph::Easy::_border_attribute_as_html( $self->{style_ver}, $bow, $self->{color_ver});
}
###########################################################################
my $edge_color = ''; $edge_color = " color: $color;" if $color;
# If the group doesn't have a fill attribute, then it is defined in the CSS
# of the group, and since we get the same class, we can skip the background.
# But if the group has a fill, we need to use this as override.
# The idea behind is to omit the "background: #daffff;" as much as possible.
my $bg = $self->attribute('background') || '';
my $group = $self->{edge}->{group};
$bg = '' if $bg eq 'inherit';
$bg = $group->{att}->{fill} if $group->{att}->{fill} && $bg eq '';
$bg = '' if $bg eq 'inherit';
$bg = " background: $bg;" if $bg;
my $title = $self->title();
$title =~ s/"//g; # replace quotation marks
$title = " title=\"$title\"" if $title ne ''; # add mouse-over title
###########################################################################
# replace templates
require Graph::Easy::As_ascii if $as ne 'none'; # for _unicode_arrow()
# replace borderv with the border for the vertical edge on CROSS sections
$border =~ s/\s+/ /g; # collapse multiple spaces
$border_v =~ s/\s+/ /g;
my $cl = $self->class(); $cl =~ s/\./_/g; # group.cities => group_cities
my $rc;
for my $a (@$code)
{
if (ref($a))
{
for my $c (@$a)
{
push @$rc, $self->_format_td($c,
$border, $border_v, $label_style, $edge_color, $bg, $as, $ashape, $title, $label, $cl);
}
}
else
{
push @$rc, $self->_format_td($a,
$border, $border_v, $label_style, $edge_color, $bg, $as, $ashape, $title, $label, $cl);
}
}
$rc;
}
sub _format_td
{
my ($self, $c,
$border, $border_v, $label_style, $edge_color, $bg, $as, $ashape, $title, $label, $cl) = @_;
# insert 'style="##bg##"' unless there is already a style
$c =~ s/( e[bl]")(>( )?<\/td>)/$1 style="##bg##"$2/g;
# insert missing "##bg##"
$c =~ s/style="border/style="##bg##border/g;
$c =~ s/##class##/$cl/g;
$c =~ s/##border##/$border/g;
$c =~ s/##borderv##/$border_v/g;
$c =~ s/##lc##/$label_style/g;
$c =~ s/##edgecolor##/ style="$edge_color"/g;
$c =~ s/##ec##/$edge_color/g;
$c =~ s/##bg##/$bg/g;
$c =~ s/ style=""//g; # remove empty styles
# remove arrows if edge is undirected
$c =~ s/>(v|\^|<|>)/>/g if $as eq 'none';
# insert "nice" looking Unicode arrows
$c =~ s/>(v|\^|<|>)/'>' . $self->_unicode_arrow($ashape, $as, $1); /eg;
# insert the label last, other "v" as label might get replaced above
$c =~ s/>##label##/$title>$label/;
# for empty labels use a different class
$c =~ s/ lh"/ eb"/ if $label eq '';
$c .= "\n" unless $c =~ /\n\z/;
$self->quoted_comment() . $c;
}
sub class
{
my $self = shift;
my $c = $self->{class} . ($self->{cell_class} || '');
$c = $self->{edge}->{group}->class() . ' ' . $c if ref($self->{edge}->{group});
$c;
}
sub group
{
# return the group we belong to as the group of our parent-edge
my $self = shift;
$self->{edge}->{group};
}
#############################################################################
# accessor methods
sub type
{
# get/set type of this path element
# type - EDGE_START, EDGE_END, EDGE_HOR, EDGE_VER, etc
my ($self,$type) = @_;
if (defined $type)
{
if (defined $type && $type < 0 || $type > EDGE_MAX_TYPE)
{
require Carp;
Carp::confess ("Cell type $type for cell $self->{x},$self->{y} is not valid.");
}
$self->{type} = $type;
}
$self->{type};
}
#############################################################################
# For rendering this path element as ASCII, we need to correct our width based
# on whether we have a border or not. But this is only known after parsing is
# complete.
sub _correct_size
{
my ($self,$format) = @_;
return if defined $self->{w};
# min-size is this
$self->{w} = 5; $self->{h} = 3;
# make short cell pieces very small
if (($self->{type} & EDGE_SHORT_CELL) != 0)
{
$self->{w} = 1; $self->{h} = 1;
return;
}
my $arrows = ($self->{type} & EDGE_ARROW_MASK);
my $type = ($self->{type} & EDGE_TYPE_MASK);
if ($self->{edge}->{bidirectional} && $arrows != 0)
{
$self->{w}++ if $type == EDGE_HOR;
$self->{h}++ if $type == EDGE_VER;
}
# make joints bigger if they got arrows
my $ah = $self->{type} & EDGE_ARROW_HOR;
my $av = $self->{type} & EDGE_ARROW_VER;
$self->{w}++ if $ah && ($type == EDGE_S_E_W || $type == EDGE_N_E_W);
$self->{h}++ if $av && ($type == EDGE_E_N_S || $type == EDGE_W_N_S);
my $style = $self->{edge}->attribute('style') || 'solid';
# make the edge to display ' ..-> ' instead of ' ..> ':
$self->{w}++ if $style eq 'dot-dot-dash';
if ($type >= EDGE_LOOP_TYPE)
{
# +---+
# | V
# +
# +--> |
# | |
# +--- |
# +
$self->{w} = 7;
$self->{w} = 8 if $type == EDGE_N_W_S || $type == EDGE_S_W_N;
$self->{h} = 3;
$self->{h} = 5 if $type != EDGE_N_W_S && $type != EDGE_S_W_N;
}
if ($self->{type} == EDGE_HOR)
{
$self->{w} = 0;
}
elsif ($self->{type} == EDGE_VER)
{
$self->{h} = 0;
}
elsif ($self->{type} & EDGE_LABEL_CELL)
{
# edges do not have borders
my ($w,$h) = $self->dimensions(); $h-- unless $h == 0;
$h += $self->{h};
$w += $self->{w};
$self->{w} = $w;
$self->{h} = $h;
}
}
#############################################################################
# attribute handling
sub attribute
{
my ($self, $name) = @_;
my $edge = $self->{edge};
# my $native = $edge->{att}->{$name};
# return $native if defined $native && $native ne 'inherit';
# shortcut, look up the attribute directly
return $edge->{att}->{$name}
if defined $edge->{att}->{$name} && $edge->{att}->{$name} ne 'inherit';
return $edge->attribute($name);
# XXX TODO This does not work, since caching the attribute doesn't get invalidated
# upon set_attribute().
# $edge->{cache} = {} unless exists $edge->{cache};
# $edge->{cache}->{att} = {} unless exists $edge->{cache}->{att};
#
# my $cache = $edge->{cache}->{att};
# return $cache->{$name} if exists $cache->{$name};
#
# my $rc = $edge->attribute($name);
# # only cache values that weren't inherited to avoid cache problems
# $cache->{$name} = $rc unless defined $native && $native eq 'inherit';
#
# $rc;
}
1;
#############################################################################
#############################################################################
package Graph::Easy::Edge::Cell::Empty;
require Graph::Easy::Node::Cell;
our @ISA = qw/Graph::Easy::Node::Cell/;
#use vars qw/$VERSION/;
our $VERSION = '0.76';
use constant isa_cell => 1;
1;
__END__
=head1 NAME
Graph::Easy::Edge::Cell - A cell in an edge in Graph::Easy
=head1 SYNOPSIS
use Graph::Easy;
my $ssl = Graph::Easy::Edge->new(
label => 'encrypted connection',
style => 'solid',
color => 'red',
);
my $src = Graph::Easy::Node->new( 'source' );
my $dst = Graph::Easy::Node->new( 'destination' );
$graph = Graph::Easy->new();
$graph->add_edge($src, $dst, $ssl);
print $graph->as_ascii();
=head1 DESCRIPTION
A C<Graph::Easy::Edge::Cell> represents an edge between two (or more) nodes
in a simple graph.
Each edge has a direction (from source to destination, or back and forth),
plus a style (line width and style), colors etc. It can also have a name,
e.g. a text label associated with it.
There should be no need to use this package directly.
=head1 METHODS
=head2 error()
$last_error = $edge->error();
$cvt->error($error); # set new messages
$cvt->error(''); # clear error
Returns the last error message, or '' for no error.
=head2 as_ascii()
my $ascii = $path->as_ascii();
Returns the path-cell as a little ascii representation.
=head2 as_html()
my $html = $path->as_html($tag,$id);
eturns the path-cell as HTML code.
=head2 label()
my $label = $path->label();
Returns the name (also known as 'label') of the path-cell.
=head2 style()
my $style = $edge->style();
Returns the style of the edge.
=head1 EXPORT
None by default. Can export the following on request:
EDGE_START_E
EDGE_START_W
EDGE_START_N
EDGE_START_S
EDGE_END_E
EDGE_END_W
EDGE_END_N
EDGE_END_S
EDGE_SHORT_E
EDGE_SHORT_W
EDGE_SHORT_N
EDGE_SHORT_S
EDGE_SHORT_BD_EW
EDGE_SHORT_BD_NS
EDGE_SHORT_UN_EW
EDGE_SHORT_UN_NS
EDGE_HOR
EDGE_VER
EDGE_CROSS
EDGE_N_E
EDGE_N_W
EDGE_S_E
EDGE_S_W
EDGE_S_E_W
EDGE_N_E_W
EDGE_E_N_S
EDGE_W_N_S
EDGE_LOOP_NORTH
EDGE_LOOP_SOUTH
EDGE_LOOP_EAST
EDGE_LOOP_WEST
EDGE_N_W_S
EDGE_S_W_N
EDGE_E_S_W
EDGE_W_S_E
EDGE_TYPE_MASK
EDGE_FLAG_MASK
EDGE_ARROW_MASK
EDGE_START_MASK
EDGE_END_MASK
EDGE_MISC_MASK
ARROW_RIGHT
ARROW_LEFT
ARROW_UP
ARROW_DOWN
=head1 SEE ALSO
L<Graph::Easy>.
=head1 AUTHOR
Copyright (C) 2004 - 2007 by Tels L<http://bloodgate.com>.
See the LICENSE file for more details.
=cut