how can draw a line that is created from path mouse but the lines be broken vertical line?

stackprogramer

hi, i want to between two object in graphicview created a line,that they are broken vertical and horizontal line.i created lines between two objects.
this is a part source example diagram scene:

void Arrow::paint(QPainter *painter, const QStyleOptionGraphicsItem *,
          QWidget *)
{
    if (myStartItem->collidesWithItem(myEndItem))
        return;

    QPen myPen = pen();
    myPen.setColor(myColor);
    qreal arrowSize = 20;
    painter->setPen(myPen);
    painter->setBrush(myColor);
//! [4] //! [5]

    QLineF centerLine(myStartItem->pos(), myEndItem->pos());
    QPolygonF endPolygon = myEndItem->polygon();
    QPointF p1 = endPolygon.first() + myEndItem->pos();
    QPointF p2;
    QPointF intersectPoint;
    QLineF polyLine;
    for (int i = 1; i < endPolygon.count(); ++i) {
    p2 = endPolygon.at(i) + myEndItem->pos();
    polyLine = QLineF(p1, p2);
    QLineF::IntersectType intersectType =
        polyLine.intersect(centerLine, &intersectPoint);
    if (intersectType == QLineF::BoundedIntersection)
        break;
        p1 = p2;
    }

    setLine(QLineF(intersectPoint, myStartItem->pos()));
//! [5] //! [6]

    double angle = ::acos(line().dx() / line().length());
    if (line().dy() >= 0)
        angle = (Pi * 2) - angle;

        QPointF arrowP1 = line().p1() + QPointF(sin(angle + Pi / 3) * arrowSize,
                                        cos(angle + Pi / 3) * arrowSize);
        QPointF arrowP2 = line().p1() + QPointF(sin(angle + Pi - Pi / 3) * arrowSize,
                                        cos(angle + Pi - Pi / 3) * arrowSize);

        arrowHead.clear();
        arrowHead << line().p1() << arrowP1 << arrowP2;
//! [6] //! [7]
        painter->drawLine(line());
        painter->drawPolygon(arrowHead);
        if (isSelected()) {
            painter->setPen(QPen(myColor, 1, Qt::DashLine));
        QLineF myLine = line();
        myLine.translate(0, 4.0);
        painter->drawLine(myLine);
        myLine.translate(0,-8.0);
        painter->drawLine(myLine);
    }

see below image:

http://www.mediafire.com/view/5apc35l064pd4kp/brokenline.png
i want to it is same broken line same matlabsimulink...below image
http://www.mediafire.com/view/z1axz5p7tmlqx8d/linebroken2(2).png#

thanks for reply

stackprogramer

anyone doesn't any idea>please help me

thanks for reply.

Ni.Sumi

Hi @stackprogramer ,

I have example code for drawing the Dash lines/ dash dot line/ dash dot sot lines. It is example, copied from internet and some of my code. Please download it here. . It draws the line basing on the mouse press, move and release. You can change the origin and last postion in this cide and can use as you wish. I did not set any toolbar menu to give the DashLine/DashDotLine/DashDotDotLine. I just hard coded it. Fin it in the scene.cpp at line "itemToDraw->setPen(QPen(Qt::black, 3, Qt::DashLine));" in void Scene::mouseMoveEvent(QGraphicsSceneMouseEvent *event) function.

Hopefully, it solves your problem.

stackprogramer

thanks but i want to broken line ,direct line example i had.