Commits on Jan 11, 2017

1. Add method to retrieve variables from a QgsExpressionContext as a QVa… …

   …riantMap

   

   nyalldawson committed Jan 11, 2017
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2. [FEATURE] item_variables expression function inside compositions …

   This adds a new item_variables expression function when expressions
   are used inside a composition context.
   
   The function takes a single argument, the id for an item inside
   the composition, and returns a map of variable name to value
   for that item.
   
   This allows you to do things like insert text in a label fetching
   properties of another item in the composition, eg
   
   Insert scale of map into a label:
   
   map_get( item_variables( 'map'),'map_scale')
   
   Insert x coordinate of map center into a label:
   
   x(map_get( item_variables( 'map'),'map_extent_center'))

   

   nyalldawson committed Jan 11, 2017
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3. [FEATURE] New expression variables for map settings …

   - map_crs, map_crs_definition: retrieves crs details for map
   - map_units: retrieves units for map (eg 'meters','degrees')

   

   nyalldawson committed Jan 11, 2017
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