WoWInterface - Adding a gcd spark to a castbar

I've made my own gcd element for my personal layout, it's not very complicated to understand, it may help you so here is the code for the element:

Code:

local parent, ns = ...

local oUF = ns.oUF



local GetTime, GetSpellCooldown = GetTime, _G.GetSpellCooldown



local _, class = UnitClass('player')

local spellName

if class == 'DEATHKNIGHT' then

        spellName = GetSpellInfo(45902)

elseif class == 'DRUID' then

        spellName = GetSpellInfo(5176)

elseif class == 'HUNTER' then

        spellName = GetSpellInfo(3044)

elseif class == 'MAGE' then

        spellName = GetSpellInfo(133)

elseif class == 'PALADIN' then

        spellName = GetSpellInfo(20271)

elseif class == 'PRIEST' then

        spellName = GetSpellInfo(2061)

elseif class == 'ROGUE' then

        spellName = GetSpellInfo(1752)

elseif class == 'SHAMAN' then

        spellName = GetSpellInfo(331)

elseif class == 'WARLOCK' then

        spellName = GetSpellInfo(348)

elseif class == 'WARRIOR' then

        spellName = GetSpellInfo(772)

end



local function OnUpdate(self, elapsed)

        self.currentTime = self.currentTime + elapsed

        if self.currentTime >= self.endTime then

                self:Hide()

        end

        self.Spark:SetPoint('CENTER', self, 'LEFT', (self.currentTime - self.startTime) * self:GetWidth() / self.duration, 0)

end



local function Update(self, event)

        local gcd = self.TomGCD

        local start, duration, enable = GetSpellCooldown(spellName)

        if enable == 1 and start and duration > 0 and duration <= 1.5 then

                gcd.startTime = start

                gcd.currentTime = GetTime()

                gcd.duration = duration

                gcd.endTime = start + duration

                gcd:Show()

        else

                gcd:Hide()

        end

end



local ForceUpdate = function(element)

        return Update(element.__owner, 'ForceUpdate')

end



local function Enable(self, unit)

        local gcd = self.TomGCD

        if gcd then

                gcd.__owner = self

                gcd.ForceUpdate = ForceUpdate

                self:RegisterEvent('SPELL_UPDATE_COOLDOWN', Update)

                gcd:SetScript('OnUpdate', OnUpdate)

                gcd:Hide()

        end

end



local function Disable(self, unit)

        local gcd = self.TomGCD

        if gcd then

                self:UnregisterEvent('SPELL_UPDATE_COOLDOWN', Update)

                gcd:SetScript('OnUpdate', nil)

                gcd:Hide()

        end

end



oUF:AddElement('TomGCD', Update, Enable, Disable)

here is how I spawn it in my layout :

Code:

local function spawnGCDBar(self, width, height, ...)

        local gcd = CreateFrame('Frame', nil, UIParent)

        gcd:SetSize(width, height)

        gcd:SetBackdrop(backdrop)

        gcd:SetBackdropColor(0.25, 0.25, 0.25)



        local spark = gcd:CreateTexture(nil, 'OVERLAY')

        spark:SetTexture([[Interface\CastingBar\UI-CastingBar-Spark]])

        spark:SetBlendMode('ADD')

        spark:SetSize(20, height*2.2)

        gcd.Spark = spark



        gcd:SetPoint(...)

        return gcd

end

it should not be very complicated to adapt it to your needs