C++ (Cpp) deltaAt Examples

Example #1

File: borderarcstroker.cpp Project: KDE/khtml

// Returns the normal vector at t
QLineF KCubicBezier::normalVectorAt(qreal t) const
{
    const QPointF point = pointAt(t);
    const QPointF delta = deltaAt(t);

    return QLineF(point, point + delta).normalVector();
}

Example #2

File: borderarcstroker.cpp Project: KDE/khtml

// Returns the slope at t (dy / dx)
qreal KCubicBezier::slopeAt(qreal t) const
{
    const QPointF delta = deltaAt(t);
    return qFuzzyIsNull(delta.x()) ?
           (delta.y() < 0 ? -1 : 1) : delta.y() / delta.x();
}

Example #3

File: fdmhestonsolver.cpp Project: derekcameron/quantlibcl

 Real FdmHestonSolver::meanVarianceDeltaAt(Real s, Real v) const {
     calculate();
     const Real x = std::log(s);
     const Real alpha = process_->rho()*process_->sigma()/s;
     return deltaAt(s, v) + alpha*interpolation_->derivativeY(x, v);
 }