Let's the user change the position of the built in Combat Text (WoW)

CombatText.lua

local xOffset, yOffset = 300, 100
CombatText_AddMessage = function(message, scrollFunction, r, g, b, displayType, isStaggered)
	local string, noStringsAvailable = CombatText_GetAvailableString()
	if noStringsAvailable then
		return
	end
	
	message = subString(message, msgType)
	
	string:SetText(message)
	string:SetTextColor(r, g, b)
	string.scrollTime = 0
	if displayType == "crit" then
		string.scrollFunction = CombatText_StandardScroll
	else
		string.scrollFunction = scrollFunction
	end
 
	-- See which direction the message should flow
	local yDir
	local lowestMessage
	local useXadjustment = 0
	if COMBAT_TEXT_LOCATIONS.startY < COMBAT_TEXT_LOCATIONS.endY then
		-- Flowing up
		lowestMessage = string:GetBottom()
		-- Find lowest message to anchor to
		for index, value in pairs(COMBAT_TEXT_TO_ANIMATE) do
			if lowestMessage >= value.yPos - 16 - COMBAT_TEXT_SPACING then
				lowestMessage = value.yPos - 16 - COMBAT_TEXT_SPACING
			end
		end
		if lowestMessage < (COMBAT_TEXT_LOCATIONS.startY - COMBAT_TEXT_MAX_OFFSET) then
			if displayType == "crit" then
				lowestMessage = string:GetBottom()
			else
				COMBAT_TEXT_X_ADJUSTMENT = COMBAT_TEXT_X_ADJUSTMENT * -1
				useXadjustment = 1
				lowestMessage = COMBAT_TEXT_LOCATIONS.startY - COMBAT_TEXT_MAX_OFFSET
			end
		end
	else
		-- Flowing down
		lowestMessage = string:GetTop()
		-- Find lowest message to anchor to
		for index, value in pairs(COMBAT_TEXT_TO_ANIMATE) do
			if lowestMessage <= value.yPos + 16 + COMBAT_TEXT_SPACING then
				lowestMessage = value.yPos + 16 + COMBAT_TEXT_SPACING
			end
		end
		if lowestMessage > (COMBAT_TEXT_LOCATIONS.startY + COMBAT_TEXT_MAX_OFFSET) then
			if displayType == "crit" then
				lowestMessage = string:GetTop()
			else
				COMBAT_TEXT_X_ADJUSTMENT = COMBAT_TEXT_X_ADJUSTMENT * -1
				useXadjustment = 1
				lowestMessage = COMBAT_TEXT_LOCATIONS.startY + COMBAT_TEXT_MAX_OFFSET
			end
		end
	end
 
	-- Handle crits
	if displayType == "crit" then
		string.endY = COMBAT_TEXT_LOCATIONS.startY
		string.isCrit = 1
		string:SetTextHeight(COMBAT_TEXT_CRIT_MINHEIGHT)
	elseif displayType == "sticky" then
		string.endY = COMBAT_TEXT_LOCATIONS.startY
		string:SetTextHeight(COMBAT_TEXT_HEIGHT)
	else
		string.endY = COMBAT_TEXT_LOCATIONS.endY
		string:SetTextHeight(COMBAT_TEXT_HEIGHT)
	end
 
	-- Stagger the text if flagged
	local staggerAmount = 0
	if isStaggered then
		staggerAmount = random(0, COMBAT_TEXT_STAGGER_RANGE) - COMBAT_TEXT_STAGGER_RANGE / 2
	end
 
	-- Alternate x direction
	CombatText.xDir = CombatText.xDir * -1
	if useXadjustment == 1 then
		if COMBAT_TEXT_X_ADJUSTMENT > 0 then
			CombatText.xDir = -1
		else
			CombatText.xDir = 1
		end
	end
	string.xDir = CombatText.xDir
	string.startX = COMBAT_TEXT_LOCATIONS.startX + staggerAmount + (useXadjustment * COMBAT_TEXT_X_ADJUSTMENT) + xOffset
	string.startY = lowestMessage + yOffset
	string.yPos = lowestMessage
	string:ClearAllPoints()
	string:SetPoint("LEFT", WorldFrame, "BOTTOMLEFT", string.startX, string.startY)
	string:SetAlpha(1)
	string:Show()
	tinsert(COMBAT_TEXT_TO_ANIMATE, string)
end