power: account for a possible non-zero altpower min value

elements/power.lua

@@ -117,9 +117,9 @@ oUF.colors.power[8] = oUF.colors.power["ECLIPSE"]
 oUF.colors.power[9] = oUF.colors.power["HOLY_POWER"]
 
 local GetDisplayPower = function(unit)
-	local _, _, _, _, _, _, showOnRaid = UnitAlternatePowerInfo(unit)
+	local _, min, _, _, _, _, showOnRaid = UnitAlternatePowerInfo(unit)
 	if(showOnRaid) then
-		return ALTERNATE_POWER_INDEX
+		return ALTERNATE_POWER_INDEX, min
 	end
 end
 
@@ -129,10 +129,13 @@ local Update = function(self, event, unit)
 
 	if(power.PreUpdate) then power:PreUpdate(unit) end
 
-	local displayType = power.displayAltPower and GetDisplayPower(unit)
+	local displayType, min
+	if power.displayAltPower then
+		displayType, min = GetDisplayPower(unit)
+	end
 	local cur, max = UnitPower(unit, displayType), UnitPowerMax(unit, displayType)
 	local disconnected = not UnitIsConnected(unit)
-	power:SetMinMaxValues(0, max)
+	power:SetMinMaxValues(min or 0, max)
 
 	if(disconnected) then
 		power:SetValue(max)
@@ -172,7 +175,8 @@ local Update = function(self, event, unit)
 	elseif(power.colorReaction and UnitReaction(unit, 'player')) then
 		t = self.colors.reaction[UnitReaction(unit, "player")]
 	elseif(power.colorSmooth) then
-		r, g, b = self.ColorGradient(cur, max, unpack(power.smoothGradient or self.colors.smooth))
+        local adjust = 0 - (min or 0)
+		r, g, b = self.ColorGradient(cur + adjust, max + adjust, unpack(power.smoothGradient or self.colors.smooth))
 	end
 
 	if(t) then
@@ -190,7 +194,7 @@ local Update = function(self, event, unit)
 	end
 
 	if(power.PostUpdate) then
-		return power:PostUpdate(unit, cur, max)
+		return power:PostUpdate(unit, cur, max, min)
 	end
 end