diff layer/ColourScale.h @ 1362:d79e21855aef

Add mechanism for saving/loading colour maps by name/id rather than by numerical index, for future compatibility when adding to or changing the supported colour maps. Add two new colour maps (and one old one). Write out backward-compatible numerical indices for use when reloading in older versions. Also add a mechanism to invert the colour map, though I don't think it turns out useful enough to include in the UI.

--- a/layer/ColourScale.h	Fri Oct 12 11:17:29 2018 +0100
+++ b/layer/ColourScale.h	Thu Oct 18 13:21:56 2018 +0100
@@ -36,7 +36,7 @@
 public:
     struct Parameters {
         Parameters() : colourMap(0), scaleType(ColourScaleType::Linear),
-                       minValue(0.0), maxValue(1.0),
+                       minValue(0.0), maxValue(1.0), inverted(false),
                        threshold(0.0), gain(1.0), multiple(1.0) { }
 
         /** A colour map index as used by ColourMapper */
@@ -51,6 +51,9 @@
         /** Maximum value in source range. Must be > minValue */
         double maxValue;
 
+        /** Whether the colour scale should be mapped inverted */
+        bool inverted;
+
         /** Threshold below which every value is mapped to background
             pixel 0 */
         double threshold;