local move_speed = {}
local trigger_range = {}
local damage_range = {}
local move_range = {}
local moved = {}
local damage = {}
local repeating = {}
local startx = {}
local starty = {}
local startz = {}
--set entity to immobile
--sound at slot 0 will loop for a sliding wall etc effect
function trap_wall_init(e)
--if trap will reset after player moves away or dies etc
repeating[e] = 1 
--when to start moving the wall
trigger_range[e] = 260
--max range at which damage can be applied (also requires walls to be closed)
damage_range[e] = 160
--wall will stop getting closer after it's moved this far (damage will stop too)
move_range[e] = 230
--how fast the wall will "slide"
move_speed[e] = 30
--damage per 0.25s
damage[e] = 10
end

function trap_wall_main(e)

if repeating[e] == 1 and (startx[e] == nil or starty[e] == nil or startz[e] == nil) then
startx[e] = g_Entity[e]['x']
starty[e] = g_Entity[e]['y']
startz[e] = g_Entity[e]['z']
else
if GetPlayerFlatDistance(e) < trigger_range[e] then
if moved[e] == nil then
moved[e] = 0
end
LoopSound(e,0)
if moved[e] < move_range[e] then
CollisionOff(e)
MoveForward(e,move_speed[e])
moved[e] = moved[e] + 1
CollisionOn(e)
if moved[e] > move_range[e] * 0.9 then
if GetPlayerFlatDistance(e) < damage_range[e] then
if GetTimer(e) > 250 then
StartTimer(e)
HurtPlayer(e,damage[e])
end
end
end
else
StopSound(e,0)
end
else
CollisionOn(e)
StopSound(e,0)
if repeating[e] == 1 then
moved[e] = 0
CollisionOff(e)
SetPosition(e,startx[e],starty[e],startz[e])
CollisionOn(e)
end
end
end

end


------
function GetPlayerFlatDistance(e)
  tPlayerDX = (g_Entity[e]['x'] - g_PlayerPosX)
  tPlayerDZ = (g_Entity[e]['z'] - g_PlayerPosZ)
  return math.sqrt(math.abs(tPlayerDX*tPlayerDX)+math.abs(tPlayerDZ*tPlayerDZ));
end