Function axis

3rdparty/qcustomplot/qcustomplot.h:5397–5400

public:
  explicit QCPColorScale(QCustomPlot *parentPlot);
  virtual ~QCPColorScale() Q_DECL_OVERRIDE;
  
  // getters:
  QCPAxis *axis() const { return mColorAxis.data(); }
  QCPAxis::AxisType type() const { return mType; }
  QCPRange dataRange() const { return mDataRange; }
  QCPAxis::ScaleType dataScaleType() const { return mDataScaleType; }