Add QgsUnitTypes::areaToDistanceUnit

python/core/auto_generated/qgsunittypes.sip.in

@@ -283,6 +283,15 @@ Converts a distance unit to its corresponding area unit, e.g., meters to square
 :return: matching areal unit
 %End
 
+    static QgsUnitTypes::DistanceUnit areaToDistanceUnit( QgsUnitTypes::AreaUnit areaUnit );
+%Docstring
+Converts an area unit to its corresponding distance unit, e.g., square meters to meters
+
+:param areaUnit: area unit to convert
+
+:return: matching distance unit
+%End
+
 
     static QString encodeUnit( QgsUnitTypes::AngleUnit unit );
 %Docstring

src/core/qgsunittypes.cpp

@@ -1140,7 +1140,7 @@ QgsUnitTypes::AreaUnit QgsUnitTypes::distanceToAreaUnit( DistanceUnit distanceUn
       return AreaSquareCentimeters;
 
     case DistanceMillimeters:
-      return AreaSquareCentimeters;
+      return AreaSquareMillimeters;
 
     case DistanceFeet:
       return AreaSquareFeet;
@@ -1164,6 +1164,46 @@ QgsUnitTypes::AreaUnit QgsUnitTypes::distanceToAreaUnit( DistanceUnit distanceUn
   return AreaUnknownUnit;
 }
 
+QgsUnitTypes::DistanceUnit QgsUnitTypes::areaToDistanceUnit( AreaUnit areaUnit )
+{
+  switch ( areaUnit )
+  {
+    case AreaSquareMeters:
+    case AreaHectares:
+      return DistanceMeters;
+
+    case AreaSquareKilometers:
+      return DistanceKilometers;
+
+    case AreaSquareCentimeters:
+      return DistanceCentimeters;
+
+    case AreaSquareMillimeters:
+      return DistanceMillimeters;
+
+    case AreaSquareFeet:
+      return DistanceFeet;
+
+    case AreaSquareYards:
+    case AreaAcres:
+      return DistanceYards;
+
+    case AreaSquareMiles:
+      return DistanceMiles;
+
+    case AreaSquareDegrees:
+      return DistanceDegrees;
+
+    case AreaUnknownUnit:
+      return DistanceUnknownUnit;
+
+    case AreaSquareNauticalMiles:
+      return DistanceNauticalMiles;
+  }
+
+  return DistanceUnknownUnit;
+}
+
 QString QgsUnitTypes::encodeUnit( QgsUnitTypes::AngleUnit unit )
 {
   switch ( unit )

src/core/qgsunittypes.h

@@ -306,6 +306,13 @@ class CORE_EXPORT QgsUnitTypes
      */
     Q_INVOKABLE static QgsUnitTypes::AreaUnit distanceToAreaUnit( QgsUnitTypes::DistanceUnit distanceUnit );
 
+    /**
+     * Converts an area unit to its corresponding distance unit, e.g., square meters to meters
+     * \param areaUnit area unit to convert
+     * \returns matching distance unit
+     */
+    Q_INVOKABLE static QgsUnitTypes::DistanceUnit areaToDistanceUnit( QgsUnitTypes::AreaUnit areaUnit );
+
     // ANGULAR UNITS
 
     /**