#include "connection.h"

#include <QPen>

Connection::Connection(Item* from, Item::AnchorType fromType,
                       Item* to, Item::AnchorType toType, QGraphicsItem* parent)
    : QGraphicsLineItem(parent),
      from_(from), to_(to), fromType_(fromType), toType_(toType)
{
    setZValue(-1); // 在图元之下
    setPen(QPen(Qt::black, 2));
    from_->addConnection(this);
    to_->addConnection(this);
    updatePosition();
}

void Connection::updatePosition()
{
    setLine(QLineF(from_->anchorPos(fromType_), to_->anchorPos(toType_)));
}