Displaying Timer on HUD

[etc2002]

Hello, I am trying to make a timer, from my addon, display on my darkrp hud.

The timer code is:

if ( text == "/squidditch" ) and ply:IsAdmin() then
	timer.Create("ClassTime", 500, 1, function()
	end )

Then, in my HUD, I inserted the code

local LineOne = "Class Time Left:"
	local LineTwo = math.Round( timer.TimeLeft("ClassTime") )

surface.SetFont("Parry Hotter") --Font must be set before getting the size, or the size will come out wrong.
local w, h = surface.GetTextSize(LineOne) --Line one dimensions.
local ww, hh = surface.GetTextSize(LineTwo) --Line two dimensions.

local LongestLine = math.max(w, ww)

local Padding = 4
local Spacing = 2

hook.Add("HUDPaint", "My text box script.", function()
    local BoxWidth = LongestLine+(Padding*2)
    local BoxHeight = (h+hh)+(Padding*2)
    draw.RoundedBox(4, 0, 0, BoxWidth, BoxHeight, color_black)
    draw.SimpleText(LineOne, "default", BoxWidth*0.5, Padding+(h*0.5), color_white, TEXT_ALIGN_CENTER, TEXT_ALIGN_CENTER)
     draw.SimpleText(LineTwo, "default", BoxWidth*0.5,  Padding+h+Spacing+(hh*0.5), color_white, TEXT_ALIGN_CENTER,  TEXT_ALIGN_CENTER)
end)

In my console, I get the error

[ERROR] lua/includes/extensions/math.lua:160: attempt to perform arithmetic on local 'num' (a nil value)
  1. Round - lua/includes/extensions/math.lua:160
   2. DrawInfo - addons/ethan's class system/lua/darkrp_modules/hud/cl_hud.lua:120
    3. DrawHUD - addons/ethan's class system/lua/darkrp_modules/hud/cl_hud.lua:275
     4. unknown - addons/ethan's class system/lua/darkrp_modules/hud/cl_hud.lua:434

[editline]22nd April 2017[/editline]

I got it working on the HUD, but now I need to know how to make the timer reset when /squidditch is executed.

[kaliii]

if text == "/squidditch" then
if timer.Exists("ClassTime") then
timer.Remove("ClassTime")
end

timer.Create("ClassTime", 500, 1, function()
end )
end

also instead of doing this dumb timer stuff just use CurTime()
e.g.

if text == "/squidditch" then
startTime = CurTime()
end

local LineTwo = math.min(0, math.Round((startTime + 500) - CurTime()))

[etc2002]

I put that in, but now when i do /squidditch, the time always shows up as 0 on the hud.

[editline]22nd April 2017[/editline]

Ok so the timer counts down from 500 when server starts up, and it displays on the hud. but when the timer resets when i execute the command, the HUD doesnt update with the new time, any fixes?

[MrRalgoman]

Where are you defining the text var? Are you checking for ply messages on the server then sending a net message or is it all on the client?

[etc2002]

It's all serverside.
Code in HUD:

	local LineOne = "Time Until Next Class:"
local LineTwo = math.Round( timer.TimeLeft("ClassTime") )

surface.SetFont("DarkRPHUD2") --Font must be set before getting the size, or the size will come out wrong.
local w, h = surface.GetTextSize(LineOne) --Line one dimensions.
local ww, hh = surface.GetTextSize(LineTwo) --Line two dimensions.

local LongestLine = math.max(w, ww)

local Padding = 4
local Spacing = 2


hook.Add("HUDPaint", "My text box script.", function()
    local BoxWidth = LongestLine+(Padding*2)
    local BoxHeight = (h+hh)+(Padding*2)
    draw.RoundedBox(1, 0, 0, BoxWidth, BoxHeight, color_black)
    draw.SimpleText(LineOne, "default", BoxWidth*0.5, Padding+(h*0.5), color_white, TEXT_ALIGN_CENTER, TEXT_ALIGN_CENTER)
     draw.SimpleText(LineTwo, "default", BoxWidth*0.5,  Padding+h+Spacing+(hh*0.5), color_white, TEXT_ALIGN_CENTER,  TEXT_ALIGN_CENTER)
end)

In my addon:

timer.Create("ClassTime", 500, 0, function()
end )
hook.Add( "PlayerSay", "EthanClass", function( ply, text, public )
	text = string.lower( text ) -- Make the chat message entirely lowercase
	if ( text == "/startclass1" ) and ply:IsAdmin() then
	if timer.Exists("ClassTime") then
	timer.Remove("ClassTime")
	end
	timer.Create("ClassTime", 500, 1, function()
	RunConsoleCommand( "DarkRP", "Class" )
	end )
	house1 = { "Hufflepuff" }
	house2 = { "Gryffindor" }
	house3 = { "Slytherin" }
	house4 = { "Ravenclaw" }
	class3 = { "Wizardry", "Charms", "History of Magic" }
	class3half = { "Muggle Studies", "DADA", "Transfiguration" }
	class4 = { "Class 1", "Class 3" }
	class5 = { "Class 2", "Class 4" }
	RunConsoleCommand( "DarkRP", "Class", house1[math.random( 1, #house1 )], " + ", house4[math.random( 1, #house4 )], class3[math.random( 1, #class3 )], class4[math.random( 1, #class4 )], " | ", house2[math.random( 1, #house2 )], " + ", house3[math.random( 1, #house3 )], class3half[math.random( 1, #class3half )], class5[math.random( 1, #class5 )] )
	RunConsoleCommand( "ulx", "playsound", "school_bell_1.mp3" )
	timer.Create("NotifyTime", 50, 8, function()
	RunConsoleCommand( "ulx", "csay", math.Round( timer.TimeLeft("ClassTime") ) )
	end )
	end
end )

The issue is that when i type /startclass1, the time on the box in my HUD doesn't update, it keeps counting down from original timer!