Function dot

qcustomplot/qcustomplot.h:415–415

  QCPVector2D normalized() const;
  QCPVector2D perpendicular() const { return QCPVector2D(-mY, mX); }
  double dot(const QCPVector2D &vec) const { return mX*vec.mX+mY*vec.mY; }
  double distanceSquaredToLine(const QCPVector2D &start, const QCPVector2D &end) const;
  double distanceSquaredToLine(const QLineF &line) const;
  double distanceToStraightLine(const QCPVector2D &base, const QCPVector2D &direction) const;