GLua: Why is the hood not being drawn when entering the map?

Question

Lua

I wrote a simple hood, there seems to be no errors, well, only 1, but it doesn’t seem to affect it :)
Here is the code:

if !ply:IsValid() then return end

  hp = ply:Health()
  if hp < 0 then hp = 0 end

  mx = ply:GetMaxHealth()

  ar = ply:Armor()
  if ar == 0 then ar = ''; ar2 = 0 else ar2 = ar end

  sh = '/'
  am = ply:GetActiveWeapon():Clip1()
  if am < 1 then am = ''; sh = '' end
  sa = ply:GetAmmoCount( ply:GetActiveWeapon():GetPrimaryAmmoType() )
  if sa < 1 then sa = ''; sh = '' end

  wp = ply:GetActiveWeapon():GetPrintName()
  nm = ply:Name()

  draw.RoundedBox(5, x - 10, y - 50, 220, 140, Color(0, 0, 0, 200))
  draw.RoundedBox(5, x - 10, y - 50, 220, 40, Color(0, 0, 0, 200))
  draw.SimpleText(nm, 'NameFont', x + 100, y - 30, Color(255, 255, 255, 255), TEXT_ALIGN_CENTER, TEXT_ALIGN_CENTER)

  draw.RoundedBox(2, x, y, 200, 30, Color(150, 50, 0, 250))
  draw.RoundedBox(2, x , y, math.Clamp(hp, 0, 100) * 2, 30, Color(250, 50, 0, 250))
  draw.SimpleText(hp, 'HudFont', x + 100, y + 15, Color(255, 255, 255, 255), TEXT_ALIGN_CENTER, TEXT_ALIGN_CENTER)

  draw.RoundedBox(2, x, y + 50, 200, 30, Color(0, 50, 150, 250))
  draw.RoundedBox(2, x, y + 50, math.Clamp(ar2, 0, 100) * 2, 30, Color(0, 50, 250, 250))
  draw.SimpleText(ar, 'HudFont', x + 100, y + 65, Color(255, 255, 255, 255), TEXT_ALIGN_CENTER, TEXT_ALIGN_CENTER)

  draw.RoundedBox(5, x2 - 10, y2 - 10, 220, 100, Color(0, 0, 0, 200))
  draw.RoundedBox(5, x2 - 10, y2 - 10, 220, 50, Color(0, 0, 0, 200))
  draw.SimpleText(wp, 'NameFont', x2 + 100, y2 + 15, Color(255, 255, 255, 255), TEXT_ALIGN_CENTER, TEXT_ALIGN_CENTER)
  draw.SimpleText(am..sh..sa, 'HudFont', x2 + 100, y2 + 65, Color(255, 255, 255, 255), TEXT_ALIGN_CENTER, TEXT_ALIGN_CENTER)

The code is executed by the HUDPaint hook . Help me please!
And yes, here is the error:

[ERROR] addons/minimal hud/lua/autorun/cl_init.lua:10: attempt to index global 'surface' (a nil value)
1. unknown - addons/minimal hud/lua/autorun/cl_init.lua:10

Answer 1

1) Where is the draw hook itself?
2) Where is the HL2CustomHud removal hook?
3) To draw the number of cartridges, it is better to use this (according to your scheme, there may be errors)

draw.SimpleText( getClip(), "Clip", ScrW() - 210, ScrH() - 210, Color(255,255,255,255), TEXT_ALIGN_CENTER, TEXT_ALIGN_CENTER )
  draw.SimpleText( getFullAmmo(), "FullAmmo", ScrW() - 115, ScrH() - 115, Color(255,255,255,255), TEXT_ALIGN_CENTER, TEXT_ALIGN_CENTER )