kgPanels wow addon functions for changing a gradient based on health color

Focus_OnEvent.lua

-- Early exit if SetGradient method is not available
if not self.bg.SetGradient then return end

-- Early exit if target does not exist
if not UnitExists('focus') then return end

-- Calculate focus health percentage
local healthPercent = UnitHealth('focus') / UnitHealthMax('focus')

-- Initialize color variables for gradient start and end
local startColor = {r = 1, g = 0, b = 0, a = 0.8} -- Red with 80% opacity
local endColor = {r = 1, g = 1, b = 0, a = 0.5} -- Yellow with 50% opacity

-- Adjust colors based on health percentage
if healthPercent > 0.5 then
    -- Adjust for the upper half of the health range
    healthPercent = (healthPercent - 0.5) * 2
    startColor = {r = 1, g = 1, b = 0, a = 0.5} -- Yellow with 50% opacity
    endColor = {r = 0, g = 0, b = 0, a = 0.25} -- Black with 25% opacity
else
    -- Adjust for the lower half of the health range
    healthPercent = healthPercent * 2
end

-- Calculate final gradient colors based on health percentage
local finalColor = {
    r = startColor.r + (endColor.r - startColor.r) * healthPercent,
    g = startColor.g + (endColor.g - startColor.g) * healthPercent,
    b = startColor.b + (endColor.b - startColor.b) * healthPercent,
    a = startColor.a + (endColor.a - startColor.a) * healthPercent
}

-- Apply the calculated gradient to the background
self.bg:SetGradient("HORIZONTAL", finalColor, { r = 0, g = 0, b = 0, a = 0 })

Focus_OnLoad.lua

self:RegisterEvent("UNIT_HEALTH")
self:RegisterEvent("PLAYER_FOCUS_CHANGED")

Player_OnEvent.lua

-- Early exit if SetGradient method is not available
if not self.bg.SetGradient then return end

-- Calculate player health percentage
local healthPercent = UnitHealth('player') / UnitHealthMax('player')

-- Initialize color variables for gradient start and end
local startColor = {r = 1, g = 0, b = 0, a = 0.8} -- Red with 80% opacity
local endColor = {r = 1, g = 1, b = 0, a = 0.5} -- Yellow with 50% opacity

-- Adjust colors based on health percentage
if healthPercent > 0.5 then
    -- Adjust for the upper half of the health range
    healthPercent = (healthPercent - 0.5) * 2
    startColor = {r = 1, g = 1, b = 0, a = 0.5} -- Yellow with 50% opacity
    endColor = {r = 0, g = 0, b = 0, a = 0.25} -- Black with 25% opacity
else
    -- Adjust for the lower half of the health range
    healthPercent = healthPercent * 2
end

-- Calculate final gradient colors based on health percentage
local finalColor = {
    r = startColor.r + (endColor.r - startColor.r) * healthPercent,
    g = startColor.g + (endColor.g - startColor.g) * healthPercent,
    b = startColor.b + (endColor.b - startColor.b) * healthPercent,
    a = startColor.a + (endColor.a - startColor.a) * healthPercent
}

-- Apply the calculated gradient to the background
self.bg:SetGradient("HORIZONTAL", {r = 0, g = 0, b = 0, a = 0}, finalColor)

Player_OnLoad.lua

self:RegisterEvent("UNIT_HEALTH")
self:RegisterEvent("PLAYER_ENTERING_WORLD")

Target_OnEvent.lua

-- Early exit if SetGradient method is not available
if not self.bg.SetGradient then return end

-- Early exit if target does not exist
if not UnitExists('target') then return end

-- Calculate target health percentage
local healthPercent = UnitHealth('target') / UnitHealthMax('target')

-- Initialize color variables for gradient start and end
local startColor = {r = 1, g = 0, b = 0, a = 0.8} -- Red with 80% opacity
local endColor = {r = 1, g = 1, b = 0, a = 0.5} -- Yellow with 50% opacity

-- Adjust colors based on health percentage
if healthPercent > 0.5 then
    -- Adjust for the upper half of the health range
    healthPercent = (healthPercent - 0.5) * 2
    startColor = {r = 1, g = 1, b = 0, a = 0.5} -- Yellow with 50% opacity
    endColor = {r = 0, g = 0, b = 0, a = 0.25} -- Black with 25% opacity
else
    -- Adjust for the lower half of the health range
    healthPercent = healthPercent * 2
end

-- Calculate final gradient colors based on health percentage
local finalColor = {
    r = startColor.r + (endColor.r - startColor.r) * healthPercent,
    g = startColor.g + (endColor.g - startColor.g) * healthPercent,
    b = startColor.b + (endColor.b - startColor.b) * healthPercent,
    a = startColor.a + (endColor.a - startColor.a) * healthPercent
}

-- Apply the calculated gradient to the background
self.bg:SetGradient("HORIZONTAL", finalColor, { r = 0, g = 0, b = 0, a = 0 })

Target_OnLoad.lua

self:RegisterEvent("UNIT_HEALTH") 
self:RegisterEvent("PLAYER_TARGET_CHANGED")