I thought of something that works in real life - the ability to hide the number of aircraft displayed on the radar based on their proximity

I asked GPT and maybe the code she returned matches the requirement:

```
-- define a function to calculate the distance between two objects
function calc_distance(obj1, obj2)
-- get the x and y coordinates of each object
local x1, y1 = obj1:getPosition()
local x2, y2 = obj2:getPosition()
-- calculate the distance between the objects using the distance formula
local distance = math.sqrt((x2 - x1)^2 + (y2 - y1)^2)
-- return the calculated distance
return distance
end
-- define a function to group enemy planes that are in close proximity
function group_planes(planes, threshold)
-- create a table to store the groups of planes
local groups = {}
-- loop through all of the planes
for i = 1, #planes do
-- get the current plane
local plane = planes[i]
-- create a new group for the current plane
local group = {plane}
-- loop through the remaining planes
for j = i + 1, #planes do
-- get the next plane
local other_plane = planes[j]
-- calculate the distance between the two planes
local distance = calc_distance(plane, other_plane)
-- if the distance is below the threshold, add the other plane to the group
if distance < threshold then
table.insert(group, other_plane)
end
end
-- add the group of planes to the groups table
table.insert(groups, group)
end
-- return the groups of planes
return groups
end
-- test the group_planes function with a list of planes and a proximity threshold
local planes = {plane1, plane2, plane3, plane4, plane5}
local threshold = 50
local groups = group_planes(planes, threshold)
-- print the groups of planes
for i, group in ipairs(groups) do
print("Group " .. i .. ":")
for j, plane in ipairs(group) do
print("- " .. plane:getName())
end
end
```