Draw a geometrical form

-- http://emudevs.com/showthread.php/394-Draw-a-geometrical-form
local UNIT_FIELD_FLAGS = 0x0006 + 0x0035 -- Size: 1, Type: INT, Flags: PUBLIC
local UNIT_FLAG_NOT_SELECTABLE = 0x02000000 -- 26    33554432  cannot select the unit
local INVISIBLE_DUMMY = 24417 --invisible man + cannot select the unit
local BEAM_SPELL = 33535
local DISTANCE = 5
local DELAY = 5000
local CORNERS = 5

local function Buffcommand(event, player, msg, Type, lang)
    if(tonumber(msg)) then
        CORNERS = tonumber(msg)
        local T = {}
        for i = 0, CORNERS*2-1 do
            local rads = math.pi*2/CORNERS*i
            local X, Y = player:GetRelativePoint(DISTANCE, rads)
            local guard = player:SummonGuardian( INVISIBLE_DUMMY, X, Y, player:GetHeight(X, Y), rads, DELAY)
            guard:SetUInt32Value(UNIT_FIELD_FLAGS, UNIT_FLAG_NOT_SELECTABLE)
            guard:SetRooted(true)
            table.insert(T, guard)
        end
        for i = 1, #T/2 do
            T[i]:CastSpell(T[i+1], BEAM_SPELL)
        end
        for i = #T/2+1, #T-2 do
            T[i]:CastSpell(T[i+2], BEAM_SPELL)
        end
        T[#T-1]:CastSpell(T[1], BEAM_SPELL)
        T[#T]:CastSpell(T[2], BEAM_SPELL)
        return false
    end
end
RegisterServerHook(18, Buffcommand)