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# Author: Chao-Kuei Hung
# For more info, including license, please see doc/index.html
package Edge;
# Edge of a Graph
use strict;
use Carp;
use vars qw(@ISA);
@ISA = qw(Configurable);
use Configurable;
use Vector2;
use overload
'""' => 'stringify',
'fallback' => 1
# 'eq' => '()',
# 'fallback' => undef
;
sub new {
my ($class, $src, $tgt, %opts) = @_;
$class = ref($class) if ref($class);
croak "$src is not a Vertex" unless $src->isa("Vertex");
croak "$tgt is not a Vertex" unless $tgt->isa("Vertex");
my ($self) = bless ::deep_copy(\%opts), $class;
$self->{"#host"} = $src->host();
my ($cv) = $self->host()->cget(-canvas);
$self->{shape_id} = $cv->createLine(0, 0, 0, 0);
$self->{text_id} = $cv->createText(0, 0);
# $self->{canvas}->addtag($name, "withtag", $self->{obj}{$name}{shape_id});
$self->set_ends($src, $tgt);
$self->{-arrow} = $self->cget(-directed) ? "last" : "none";
$self->configure($self->get_all_opts());
return $self;
}
sub stringify {
# serves to identify an edge, such as key for hash
my ($self) = @_;
return "$self->{adj}{src}-$self->{adj}{tgt}";
}
sub destroy {
my ($self) = @_;
$self->host()->cget(-canvas)->delete(@{$self}{"shape_id","text_id"});
}
sub source {
my ($self, $nv) = @_;
croak "you probably wanted to call set_ends()?" if $#_ >= 1;
return $self->{adj}{src};
}
sub target {
my ($self, $nv) = @_;
croak "you probably wanted to call set_ends()?" if $#_ >= 1;
return $self->{adj}{tgt};
}
sub host {
return $_[0]->{"#host"};
}
# intersection of ellipse (x/a)^2 + (y/b)^2 = 1 with line x/dx = y/dy
sub _x_oval_ {
my ($dx, $dy, $a, $b) = @_;
$a = $dx / $a;
$b = $dy / $b;
my ($t) = sqrt($a*$a + $b*$b);
return Vector2->new($dx/$t, $dy/$t);
}
sub set_ends {
my ($self, $src, $tgt, %opts) = @_;
my ($cv) = $self->host()->cget(-canvas);
@{ $self->{adj} }{qw(src tgt)} = ($src, $tgt);
my ($pos_s, $size_s) = $src->_get_cv_geom_();
my ($pos_t, $size_t) = $tgt->_get_cv_geom_();
$size_s = $size_s->pw_div(2);
$size_t = $size_t->pw_div(2);
my ($d) = $pos_t - $pos_s;
if ($d->norm() > 1) {
$pos_s += _x_oval_( @$d, @$size_s);
$pos_t -= _x_oval_( @$d, @$size_t);
} else {
carp "Both ends of edge $self coincide (at $pos_s)\n"
unless $self->cget(-quiet);
}
# now turn $d 90 degrees counter-clockwise and make it a unit vector
@$d = (-$d->[1], $d->[0]);
$d = $d->pw_div($d->norm());
my ($s, $t);
$s = $d->pw_mul($self->cget(-directed) ? 4 : 0);
$pos_s += $s; $pos_t += $s;
$cv->coords($self->{shape_id}, @$pos_s, @$pos_t);
$s += $d->pw_mul(8);
$s = $s->pw_mul(-1) if (not $self->cget(-directed) and
$s->[0] < 0 or $s->[0] == 0 and $s->[1] < 0);
$t = $self->cget(-directed) ? 2/5 : 1/2;
$cv->coords($self->{text_id},
@{ $pos_s->pw_mul($t) + $pos_t->pw_mul(1-$t) + $s }
);
}
sub configure {
my ($self, %opts) = @_;
my ($k, %shape_opts, %text_opts);
my ($opt_map) = {
-weight => [undef, undef],
-text => [undef, "-text"],
-width => ["-width", undef],
-fill => [undef, undef],
-outline => ["-fill", "-fill"],
-thick => ["-width", undef],
-arrow => ["-arrow", undef],
-stipple => [undef, undef],
-outlinestipple => ["-stipple", undef],
-state => ["-state", "-state"],
};
if (exists $opts{-directed}) {
$self->{-directed} = delete $opts{-directed};
$self->set_ends($self->source(), $self->target());
}
if (exists $opts{-status}) {
$self->{-status} = delete $opts{-status};
my ($ha) = $self->host()->cget(-appearance);
carp "unknown status $self->{-status} ignored"
unless exists $ha->{$self->{-status}};
%opts = (%{ $ha->{$self->{-status}} }, %opts);
}
foreach $k (keys %opts) {
carp "unknown option $k ignored" unless exists($opt_map->{$k});
$shape_opts{ $opt_map->{$k}[0] } = $opts{$k}
if defined $opt_map->{$k}[0];
$text_opts{ $opt_map->{$k}[1] } = $opts{$k}
if defined $opt_map->{$k}[1];
}
my ($cv) = $self->host()->cget(-canvas);
$cv->itemconfigure($self->{shape_id}, %shape_opts);
$cv->itemconfigure($self->{text_id}, %text_opts);
}
sub get_all_opts {
my ($self) = @_;
my (%opts) = $self->SUPER::get_all_opts();
delete @opts{qw(-display -shape -size -name)};
return %opts;
}
$::Config->{Edge} = {
-status => "init",
};
1;
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