comparison layer/ColourScale.h @ 1079:7ebfb61b1701 spectrogram-minor-refactor

More filling in render & cache code

     ColourScale(Parameters parameters);
     ~ColourScale();
 
     ColourScale(const ColourScale &) = default;
     ColourScale &operator=(const ColourScale &) = default;
+
+    /**
+     * Return the general type of scale this is.
+     */
+    Scale getScale() const;
     
     /**
      * Return a pixel number (in the range 0-255 inclusive)
      * corresponding to the given value.  The pixel 0 is used only for
      * values below the threshold supplied in the constructor. All
      * other values are mapped onto the range 1-255.
      */
-    int getPixel(double value);
+    int getPixel(double value) const;
 
     /**
      * Return the colour for the given pixel number (which must be in
      * the range 0-255). The pixel 0 is always the background
      * colour. Other pixels are mapped taking into account the given
      * colourmap rotation (which is also a value in the range 0-255).
      */
-    QColor getColourForPixel(int pixel, int rotation);
+    QColor getColourForPixel(int pixel, int rotation) const;
     
     /**
      * Return the colour corresponding to the given value. This is
      * equivalent to getColourForPixel(getPixel(value), rotation).
      */
-    QColor getColour(double value, int rotation) {
+    QColor getColour(double value, int rotation) const {
 	return getColourForPixel(getPixel(value), rotation);
     }
 
 private:
     Parameters m_params;