Method drawLine

graph_view.cpp:764–834

}

void MyGraphicsLineItem::drawLine(){
    //draw invisible line
    this->setLine(sP.x(), sP.y(), eP.x(), eP.y());
    //this->setPen(curPen);
    QPen bgPen;
    bgPen.setColor(QColor(255, 255, 255, 0));
    bgPen.setWidth(lineWidth + 5);
    this->setPen(bgPen);

    if(line1){
        scene()->removeItem(line1);
        line1 = nullptr;
    }
    if(line2){
        scene()->removeItem(line2);
        line2 = nullptr;
    }

    center = (startVex->scenePos() + startVex->rect().center() + endVex->scenePos() + endVex->rect().center())/2;

    drawText();

    if(text != "" && (eP - center).x() * (sP - center).x() <= 0){
        qreal dx = 0;
        qreal dy = 0;
        int f1 = 1, f2 = 1;
        if(textItem->boundingRect().width() != 0){
            if(abs(textItem->boundingRect().height() / textItem->boundingRect().width()) < abs(tan(angle))){
                dx = (textItem->boundingRect().height() + 10) / (2 * tan(angle));
                dy = (textItem->boundingRect().height() + 10) / 2;
                f2 = angle > 0 ? -1 : 1;
            }
            else{
                dy = (textItem->boundingRect().width() + 10) * tan(angle) / 2;
                dx = (textItem->boundingRect().width() + 10) / 2;
                f1 = tan(angle) < 0 ? -1 : 1;
                f2 = angle >= 0 ? -1 : 1;
            }
        }
        dx *= f1 * f2;
        dy *= f1 * f2;
        QGraphicsLineItem *newLine1 = new QGraphicsLineItem(sP.x(), sP.y(), center.x() + dx, center.y() + dy);
        QGraphicsLineItem *newLine2 = new QGraphicsLineItem(center.x() - dx, center.y() - dy, eP.x(), eP.y());

        newLine1->setZValue(this->zValue() - 1);
        newLine2->setZValue(this->zValue() - 1);
        newLine1->setPen(curPen);
        newLine2->setPen(curPen);

        scene()->addItem(newLine1);
        scene()->addItem(newLine2);
        line1 = newLine1;
        line2 = newLine2;
    }
    else{
        QGraphicsLineItem *newLine = new QGraphicsLineItem(sP.x(), sP.y(), eP.x(), eP.y());
        newLine->setPen(curPen);
        newLine->setZValue(this->zValue() - 1);