line.cpp


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#include "line.h"

Line::Line()
    :QLine()
{
    m_selected = true;
}

bool Line::isHit(const QPoint &clickPoint)
{
    QVector3D a(p2() - p1());
    QVector3D r1(p1());

    QVector3D rq(clickPoint);

    float dist = rq.distanceToLine(r1, a.normalized());

    return  dist < 5;
}

void Line::setSelected(bool selected)
{
    m_selected = selected;
}

void Line::draw(QPainter *painter)
{
    if(m_selected)
    {
        QPen penTemp(Qt::DotLine);
        penTemp.setColor(Qt::red);
        painter->setPen(penTemp);

        painter->drawEllipse(p1(), 5, 5);
        painter->drawEllipse(p2(), 5, 5);
    }
    else
    {
        QPen penNormal(Qt::SolidLine);
        penNormal.setColor(Qt::black);
        painter->setPen(penNormal);
    }

    painter->drawLine(p1(), p2());

}

void Line::move(const QPoint &oldPoint, const QPoint &newPoint)
{
    if(m_selected)
    {
        QPoint offset = newPoint - oldPoint;
        QVector3D vecOld(oldPoint);
        if(vecOld.distanceToPoint(QVector3D(p1())) < 5)
        {
            setP1(p1() + offset);
        }
        else if(vecOld.distanceToPoint(QVector3D(p2())) < 5)
        {
            setP2(p2() + offset);
        }
        else
        {
            setP1(p1() + offset);
            setP2(p2() + offset);
        }
    }
}