Method paintAngleMarker

src/tools/UBGraphicsProtractor.cpp:583–631

void UBGraphicsProtractor::paintAngleMarker(QPainter *painter)
{
    painter->save();
    painter->translate(rect().center());
    painter->rotate(-mStartAngle);
    painter->translate(-rect().center().x(), -rect().center().y());
    qreal co = cos(mCurrentAngle * PI/180);
    qreal si = sin(mCurrentAngle * PI/180);
    qreal rad = radius();

    painter->drawLine(QLineF(rect().center(), QPointF(rect().center().x()+ (rad+ 20)*co, rect().center().y() - (rad + 20)*si)));
    QPointF center = rect().center();
    painter->drawArc(QRectF(center.x() - rad/8, center.y() - rad/8, rad / 4, rad / 4), 0
                     , (mCurrentAngle - (int)(mCurrentAngle/360)*360)*16);
    painter->translate(rect().center());
    painter->rotate(-mCurrentAngle);
    painter->translate(-rect().center().x(), -rect().center().y());

    //Paint Angle text (horizontally)

    //restore transformations
    painter->translate(rect().center());
    painter->rotate(mCurrentAngle);
    painter->rotate(mStartAngle);
    painter->translate(-rect().center().x(), -rect().center().y());

    qreal angle = mCurrentAngle - (int)(mCurrentAngle/360)*360;

    if (angle != 0)
    {
        QString ang = QString("%1°").arg(angle,0, 'f', 1);
        QFont font2 = painter->font();
        font2.setBold(true);
        QFontMetricsF fm2(font2);
        painter->setFont(font2);
        if (angle < 50)
            angle = 90;
        else
            angle = angle / 2;

        co = cos((mStartAngle + angle) * PI/180);
        si = sin((mStartAngle + angle) * PI/180);
        painter->drawText(QRectF(rect().center().x() + (rad*2.5/10)*co  - fm2.horizontalAdvance(ang)/2,
                                 rect().center().y() - (rad*2.5/10)*si - fm2.height()/2,
                                 fm2.horizontalAdvance(ang), fm2.height()), Qt::AlignTop, ang);
    }

    painter->restore();
}

UBGraphicsProtractor::Tool UBGraphicsProtractor::toolFromPos(QPointF pos)
{