Module:Infobox mapframe

local mf = require('Module:Mapframe/sandbox')

function hasWikidataCoords(item_id)
	if not(mw.wikibase.isValidEntityId(item_id)) or not(mw.wikibase.entityExists(item_id)) then
		return false
	end
	local coordStatements = mw.wikibase.getBestStatements(item_id, 'P625')
	if not coordStatements or #coordStatements == 0 then
		return false
	end
	return true
end

function getZoom(length_km)
	-- max for zoom 2 is 6400km, for zoom 3 is 3200km, for zoom 4 is 1600km, etc
	local zoom = math.floor(8 - (math.log10(length_km) - 2)/(math.log10(2)))
	-- limit to values between 1 and 17
	return math.max(1, math.min(17, zoom))
end

local p = {}

p.main = function(frame)
	local parent = frame.getParent(frame)
	local parentArgs = parent.args

	-- convert parent args to standard table
	local args = {}
	for k, v in pairs(parentArgs) do
		args[k] = v
	end

	-- Some defaults/overrides for infobox presentation
	args.display = "inline"
	args.frame = "yes"
	args.plain = "yes"
	args["frame-width"] = args["frame-width"] or "270"
	if args.length_km then
		args.zoom = getZoom(tonumber(args.length_km))
	elseif args.area_km2 then
		args.zoom = getZoom(math.sqrt(tonumber(args.area_km2)))
	else
		args.zoom = 10
	end
	-- Shape
	args.type = "shape"
	args["stroke-width"] = "6"
	args["stroke-color"] = "#00ff00"
	-- Line
	args.type2 = "line"
	args["stroke-width2"] = "3"
	if args.id then
		args.id2 = args.id
	end
	-- Point
	if hasWikidataCoords(args.id or mw.wikibase.getEntityIdForCurrentPage()) then
		args.type3 = "point"
		if args.id then
			args.id3 = args.id
		end
	end

	local mapframe = mf._main(args)
	return frame:preprocess(mapframe)
end

return p
Usage
