Method clearSketch

graph_view.cpp:192–197

}

void MyGraphicsView::clearSketch(){
    if(sketchItem != nullptr){
        scene()->removeItem(sketchItem);
        sketchItem = nullptr;
    }
}

void MyGraphicsView::sketchLine(QPointF start, QPointF end){
    QGraphicsLineItem *newLine = new QGraphicsLineItem(start.x(), start.y(), end.x(), end.y());