?? link.cpp
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#include <QtGui>#include "link.h"#include "node.h"Link::Link(Node *fromNode, Node *toNode){ myFromNode = fromNode; myToNode = toNode; myFromNode->addLink(this); myToNode->addLink(this); setFlags(QGraphicsItem::ItemIsSelectable); setZValue(-1); setColor(Qt::darkRed); trackNodes();}Link::~Link(){ myFromNode->removeLink(this); myToNode->removeLink(this);}Node *Link::fromNode() const{ return myFromNode;}Node *Link::toNode() const{ return myToNode;}void Link::setColor(const QColor &color){ setPen(QPen(color, 1.0));}QColor Link::color() const{ return pen().color();}void Link::trackNodes(){ setLine(QLineF(myFromNode->pos(), myToNode->pos()));}?? 快捷鍵說(shuō)明
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