Store radar contact info

local dots = {} --//variable: store enemy position.
local dotsEnterLos = {} --//variable: remember if enemy is in LOS.

function widget:UnitEnteredRadar(unitID, allyTeam)
    dots[unitID] = {wasInLOS=false}--store something something
    if (dotsEnterLos[unitID] == true) then
        dots[unitID].wasInLOS = true
    end
end

function widget:UnitLeftRadar(unitID, allyTeam)
    dots[unitID] = nil
end

function widget:UnitEnteredLos(unitID, allyTeam )
    dotsEnterLos[unitID] = true
    if ( dots[unitID] ~= nil ) then
        dots[unitID].wasInLOS = true
    end
end

function widget:UnitLeftLos(unitID, allyTeam)
    dotsEnterLos[unitID] = nil
end

function widget:Update(n)
    for unitID, content in pairs(dots) do --//iterate over all dots and draw them
        if (dotsEnterLos[unitID] == nil) then
            local x, y, z = spGetUnitPosition(unitID)
            if x == nil then
                dots[unitID] = nil
                Spring.Echo("I am non-existent!")
            else
                if content.wasInLOS then
                    Spring.Echo("I am identified radar contact!")
                else
                    Spring.Echo("I am UN-identified radar contact!")
                end
            end
        else
            Spring.Echo("I am Visible to naked eye!")
        end
    end
end