Method reverseDirection

graph_view.cpp:896–906

}

void MyGraphicsLineItem::reverseDirection(){
    delArrow();
    startVex->removeStartLine(this);
    endVex->removeEndLine(this);
    MyGraphicsVexItem *temp = startVex;
    startVex = endVex;
    endVex = temp;
    startVex->addStartLine(this);
    endVex->addEndLine(this);
    refrshLine();
}

void MyGraphicsLineItem::moveStart(MyGraphicsVexItem *start){
    delArrow();