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package Node;
use strict;
use warnings;
use QtCore4;
use QtGui4;
use QtCore4::isa qw( Qt::GraphicsItem );
use GraphWidget;
use List::Util qw( min max );
sub edgeList() {
return this->{edgeList};
}
sub newPos() {
return this->{newPos};
}
sub graph() {
return this->{graph};
}
sub NEW
{
my ($class, $graphWidget) = @_;
$class->SUPER::NEW();
this->{graph} = $graphWidget;
this->setFlag(Qt::GraphicsItem::ItemIsMovable());
this->setFlag(Qt::GraphicsItem::ItemSendsGeometryChanges());
this->setCacheMode(Qt::GraphicsItem::DeviceCoordinateCache());
this->setZValue(-1);
this->{edgeList} = [];
}
sub addEdge
{
my ($edge) = @_;
push @{this->edgeList}, $edge;
$edge->adjust();
}
sub edges
{
return this->edgeList;
}
sub calculateForces
{
my $mouseGrabberItem = this->scene()->mouseGrabberItem();
if (!this->scene() || ($mouseGrabberItem && $mouseGrabberItem == this)) {
this->{newPos} = this->pos();
return;
}
# Sum up all forces pushing this item away
my $xvel = 0;
my $yvel = 0;
foreach my $item (@{this->scene()->items()}) {
my $node = $item;
if (!$node->isa('Node')) {
next;
}
my $line = Qt::LineF(this->mapFromItem($node, 0, 0), Qt::PointF(0, 0));
my $dx = $line->dx();
my $dy = $line->dy();
my $l = 2.0 * ($dx * $dx + $dy * $dy);
if ($l > 0) {
$xvel += ($dx * 150.0) / $l;
$yvel += ($dy * 150.0) / $l;
}
}
# Now subtract all forces pulling items together
my $weight = scalar @{this->edgeList} + 1 * 10;
foreach my $edge (@{this->edgeList}) {
my $pos;
if ($edge->sourceNode() == this) {
$pos = this->mapFromItem($edge->destNode(), 0, 0);
}
else {
$pos = this->mapFromItem($edge->sourceNode(), 0, 0);
}
$xvel += $pos->x() / $weight;
$yvel += $pos->y() / $weight;
}
if (abs($xvel) < 0.1 && abs($yvel) < 0.1) {
$xvel = $yvel = 0;
}
my $sceneRect = this->scene()->sceneRect();
this->{newPos} = this->pos() + Qt::PointF($xvel, $yvel);
this->newPos->setX(min(max(this->newPos->x(), $sceneRect->left() + 10), $sceneRect->right() - 10));
this->newPos->setY(min(max(this->newPos->y(), $sceneRect->top() + 10), $sceneRect->bottom() - 10));
}
sub advance
{
if (this->newPos == this->pos()) {
return 0;
}
this->setPos(this->newPos);
return 1;
}
sub boundingRect
{
my $adjust = 2;
return Qt::RectF(-10 - $adjust, -10 - $adjust,
23 + $adjust, 23 + $adjust);
}
sub shape
{
my $path = Qt::PainterPath();
$path->addEllipse(-10, -10, 20, 20);
return $path;
}
sub paint
{
my ($painter, $option) = @_;
$painter->setPen(Qt::NoPen());
$painter->setBrush(Qt::Brush(Qt::Color(Qt::darkGray())));
$painter->drawEllipse(-7, -7, 20, 20);
my $gradient = Qt::RadialGradient(-3, -3, 10);
if ($option->state & Qt::Style::State_Sunken()) {
$gradient->setCenter(3, 3);
$gradient->setFocalPoint(3, 3);
$gradient->setColorAt(1, Qt::Color(Qt::yellow())->light(120));
$gradient->setColorAt(0, Qt::Color(Qt::darkYellow())->light(120));
} else {
$gradient->setColorAt(0, Qt::Color(Qt::yellow()));
$gradient->setColorAt(1, Qt::Color(Qt::darkYellow()));
}
$painter->setBrush(Qt::Brush($gradient));
$painter->setPen(Qt::Pen(Qt::Brush(Qt::Color(Qt::black())), 0));
$painter->drawEllipse(-10, -10, 20, 20);
}
sub itemChange
{
my ($change, $value) = @_;
if ($change == Qt::GraphicsItem::ItemPositionHasChanged()) {
foreach my $edge (@{this->edgeList}) {
$edge->adjust();
}
this->graph->itemMoved();
};
return this->SUPER::itemChange($change, $value);
}
sub mousePressEvent
{
my ($event) = @_;
this->update();
this->SUPER::mousePressEvent($event);
}
sub mouseReleaseEvent
{
my ($event) = @_;
this->update();
this->SUPER::mouseReleaseEvent($event);
}
1;
|
