comparison layer/SpectrumLayer.h @ 274:b9380f679f70

* Fix centre line position
* Fix failure to update overview when generating peaks from wav file
* Provide y-coordinate scale values and differences for spectrum measurement
  mode, and fix values for waveform (inc dB for both)
* Add Printer colour scheme (may be futile)

                                  bool &logarithmic, QString &unit) const;
 
     virtual bool getXScaleValue(const View *v, int x,
                                 float &value, QString &unit) const;
 
+    virtual bool getYScaleValue(const View *, int y,
+                                float &value, QString &unit) const;
+
+    virtual bool getYScaleDifference(const View *, int y0, int y1,
+                                     float &diff, QString &unit) const;
+
     virtual bool isLayerScrollable(const View *) const { return false; }
 
     void setChannel(int);
     int getChannel() const { return m_channel; }