QPainterPath line to curve

[sujan.dasmahapatra]

I have drawn a straight line using QPainterPath.

QPainter painter(this);
            QPainterPath path;
            path.moveTo(QPointF(B_Point));
            path.lineTo(QPointF(D_Point));
            painter.drawPath(m_BiscepLoopPath);

QPainter painter(this);
            QPainterPath path;
            path.moveTo(QPointF(B_Point));
            path.lineTo(QPointF(D_Point));
            painter.drawPath(m_BiscepLoopPath);

To copy to clipboard, switch view to plain text mode 

BD is a straightline. Now I have to modify this line to a curve so that BD length become 100 pixel. Stright line BD length is only 50. so the line has bend startpoint B and endpoint D remains same but it should match the length to be 100.

Please help me how can I do it.? Thanks Sujan

[stampede]

Stright line BD length is only 50. so the line has bend startpoint B and endpoint D remains same but it should match the length to be 100.

If you are scared of the higher math required to calculate this, take a look at QLineF::setLength method.