with_variable(
'height',
-- Height factor for each segment. Total height will be nb cases * @height
100,
with_variable(
-- Width of the line, starting from centroid
'width',
200000,
with_variable(
'nb_cases',
array_sort(
	relation_aggregate( 
		-- Relation name 
		'covid_data_dep_french_dep_INSEE_DEP',
		-- Compile in an array
		'array_agg', 
		-- Calculate number of cases
		to_int("dc")+to_int("hosp")+to_int("rea")+to_int("rad")
	)
 ),
 -- Create geometry
geom_from_wkt(
	-- Create WKT String
	'LINESTRING ('  || 
	-- First node is the centroid
	x(centroid($geometry))||' '||y(centroid($geometry)) ||','||
	-- Paste the node coordinates
	array_to_string(
		-- Iterate over indexes
		array_foreach(
			-- Generate a series over the indexes / nodes
			generate_series(1, array_length(@nb_cases)), 
			-- X Coordinate of the node
			to_string(x(centroid($geometry)) + (@element/array_length(@nb_cases)*@width)) ||' '||
			-- Y coordinate of the node
			to_string(y(centroid($geometry)) + @nb_cases[@element]*@height)
		),
	',') || ')'
)
)))