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package Edge;
use strict;
use warnings;
use QtCore4;
use QtGui4;
use Node;
use QtCore4::isa qw( Qt::GraphicsItem );
use constant { Type => Qt::GraphicsItem::UserType() + 2 };
use Math::Trig qw(acos);
sub type() { return Type; }
sub dest() {
return this->{dest};
}
sub sourcePoint() {
return this->{sourcePoint};
}
sub destPoint() {
return this->{destPoint};
}
sub arrowSize() {
return this->{arrowSize};
}
use constant {
Pi => 3.14159265358979323846264338327950288419717
};
use constant {
TwoPi => 2.0 * Pi
};
sub NEW {
my ($class, $sourceNode, $destNode) = @_;
$class->SUPER::NEW();
this->{arrowSize} = 10;
this->setAcceptedMouseButtons(Qt::NoButton());
this->{source} = $sourceNode;
this->{dest} = $destNode;
this->{source}->addEdge(this);
this->{dest}->addEdge(this);
this->adjust();
}
sub sourceNode
{
return this->{source};
}
sub source
{
return this->{source};
}
sub setSourceNode
{
my ($node) = @_;
this->{source} = $node;
this->adjust();
}
sub destNode
{
return this->{dest};
}
sub setDestNode
{
my ($node) = @_;
this->{dest} = $node;
this->adjust();
}
sub adjust
{
if (!this->source || !this->dest) {
return;
}
my $line = Qt::LineF(this->mapFromItem(this->source, 1, 0), this->mapFromItem(this->dest, 0, 0));
my $length = $line->length();
this->prepareGeometryChange();
if ($length > 20) {
my $edgeOffset = Qt::PointF(($line->dx() * 10) / $length, ($line->dy() * 10) / $length);
this->{sourcePoint} = $line->p1() + $edgeOffset;
this->{destPoint} = $line->p2() - $edgeOffset;
} else {
this->{sourcePoint} = this->{destPoint} = $line->p1();
}
}
sub boundingRect
{
if (!this->source || !this->dest) {
return Qt::RectF();
}
my $penWidth = 1;
my $extra = ($penWidth + this->arrowSize) / 2.0;
return Qt::RectF(this->sourcePoint, Qt::SizeF(this->destPoint->x() - this->sourcePoint->x(),
this->destPoint->y() - this->sourcePoint->y()))
->normalized()
->adjusted(-$extra, -$extra, $extra, $extra);
}
sub paint
{
my ($painter) = @_;
if (!this->source || !this->dest) {
return;
}
my $line = Qt::LineF(this->sourcePoint, this->destPoint);
if (sprintf( '%02f', $line->length() ) == 0) {
return;
}
# Draw the line itself
$painter->setPen(Qt::Pen(Qt::Brush(Qt::Color(Qt::black())), 1, Qt::SolidLine(), Qt::RoundCap(), Qt::RoundJoin()));
$painter->drawLine($line);
# Draw the arrows
my $angle = Math::Trig::acos($line->dx() / $line->length());
if ($line->dy() >= 0) {
$angle = TwoPi - $angle;
}
my $sourceArrowP1 = this->sourcePoint + Qt::PointF(sin($angle + Pi / 3) * this->arrowSize,
cos($angle + Pi / 3) * this->arrowSize);
my $sourceArrowP2 = this->sourcePoint + Qt::PointF(sin($angle + Pi - Pi / 3) * this->arrowSize,
cos($angle + Pi - Pi / 3) * this->arrowSize);
my $destArrowP1 = this->destPoint + Qt::PointF(sin($angle - Pi / 3) * this->arrowSize,
cos($angle - Pi / 3) * this->arrowSize);
my $destArrowP2 = this->destPoint + Qt::PointF(sin($angle - Pi + Pi / 3) * this->arrowSize,
cos($angle - Pi + Pi / 3) * this->arrowSize);
$painter->setBrush(Qt::Brush(Qt::black()));
$painter->drawPolygon(Qt::PolygonF([ $line->p1(), $sourceArrowP1, $sourceArrowP2 ]));
$painter->drawPolygon(Qt::PolygonF([ $line->p2(), $destArrowP1, $destArrowP2 ]));
}
1;
|
