Function coordToAngleRad

3rdparty/qcustomplot/qcustomplot.h:7409–7409

  void scaleRange(double factor, double center);
  void rescale(bool onlyVisiblePlottables=false);
  double coordToAngleRad(double coord) const { return mAngleRad+(coord-mRange.lower)/mRange.size()*(mRangeReversed ? -2.0*M_PI : 2.0*M_PI); } // mention in doc that return doesn't wrap
  double angleRadToCoord(double angleRad) const { return mRange.lower+(angleRad-mAngleRad)/(mRangeReversed ? -2.0*M_PI : 2.0*M_PI)*mRange.size(); }
  void pixelToCoord(QPointF pixelPos, double &angleCoord, double &radiusCoord) const;
  QPointF coordToPixel(double angleCoord, double radiusCoord) const;