comparison layer/WaveformLayer.h @ 267:4ed1446ad604

* more on measurement tool -- pull out some logic from pane to layer &c
  still more to do

     virtual int getCompletion(View *) const;
 
     virtual bool getValueExtents(float &min, float &max,
                                  bool &log, QString &unit) const;
 
-    virtual bool getYScaleValue(View *v, int y,
+    virtual bool getYScaleValue(const View *v, int y,
                                 float &value, QString &unit) const;
 
     virtual QString toXmlString(QString indent = "",
 				QString extraAttributes = "") const;
 

 
     /// Return value is number of channels displayed
     size_t getChannelArrangement(size_t &min, size_t &max,
                                  bool &merging, bool &mixing) const;
 
-    int getYForValue(View *v, Scale scale, float value, size_t channel,
+    int getYForValue(const View *v, Scale scale, float value, size_t channel,
                      size_t minChannel, size_t maxChannel) const;
 
-    float getValueForY(View *v, Scale scale, int y,
+    float getValueForY(const View *v, Scale scale, int y,
                        size_t minChannel, size_t maxChannel) const;
 
     float        m_gain;
     bool         m_autoNormalize;
     QColor       m_colour;