Draw grass icons on map

init.lua

@@ -235,6 +235,48 @@ maps.create_map = function(pos, player_name)
 			end
 		end
 
+		local positions = minetest.find_nodes_in_area_under_air(
+			minp,
+			maxp,
+			"group:grass"
+		)
+		for _, p in ipairs(positions) do
+			local z = p.z - minp.z + 1
+			local x = p.x - minp.x + 1
+			local draw_grass = (
+				z > 1 and
+				z < size - 4 and
+				x > 4 and
+				x < size - 4
+			)
+			if draw_grass then
+				local _ = { nil } -- transparent
+				local G = { 8 } -- line
+				local grass = {
+					{ _, _, _, _, _, _, _ },
+					{ _, G, _, G, _, G, _ },
+					{ _, G, _, G, _, G, _ },
+					{ _, _, _, G, _, _, _ },
+					{ _, _, _, _, _, _, _ },
+				}
+				image:blit_icon(
+					grass,
+					{
+						x = x - 5,
+						z = z - 1,
+					},
+					{
+						[3] = true,
+						[4] = true,
+						[5] = true,
+						[6] = true,
+						[7] = true,
+						[8] = true
+					}
+				)
+			end
+		end
+
 		local filepath = textures_dir .. filename
 		image:save(
 			filepath,