load oUF_GPS (in-progress)

ElvUI/Libraries/oUF_Plugins/oUF_GPS/oUF_GPS.lua

@@ -0,0 +1,111 @@
+local ns = oUF
+local oUF = ns.oUF
+assert(oUF, "oUF not loaded")
+
+local cos, sin, sqrt2, max, atan2 = math.cos, math.sin, math.sqrt(2), math.max, math.atan2
+local tinsert, tremove = table.insert, table.remove
+local pi2 = 3.141592653589793 / 2
+
+local GetPlayerMapPosition = GetPlayerMapPosition
+local UnitInParty = UnitInParty
+local UnitInRaid = UnitInRaid
+local UnitInRange = UnitInRange
+local UnitIsConnected = UnitIsConnected
+local UnitIsUnit = UnitIsUnit
+
+local _FRAMES, OnUpdateFrame = {}
+
+local function CalculateCorner(r) return .5 + cos(r) / sqrt2, .5 + sin(r) / sqrt2 end
+local function RotateTexture(texture, angle)
+	local LRx, LRy = CalculateCorner(angle + 0.785398163)
+	local LLx, LLy = CalculateCorner(angle + 2.35619449)
+	local ULx, ULy = CalculateCorner(angle + 3.92699082)
+	local URx, URy = CalculateCorner(angle - 0.785398163)
+
+	texture:SetTexCoord(ULx, ULy, LLx, LLy, URx, URy, LRx, LRy)
+end
+
+local GetAngle = function(unit1, unit2)
+	local x1, y1 = GetPlayerMapPosition(unit1)
+	if x1 <= 0 and y1 <= 0 then return nil end
+	local x2, y2 = GetPlayerMapPosition(unit2)
+	if x2 <= 0 and y2 <= 0 then return nil end
+	-- print(pi2, GetPlayerFacing(), y2, y1, x2, x1)
+	return -pi2 - GetPlayerFacing() - atan2(y2 - y1, x2 - x1)
+end
+
+local minThrottle = 0.02
+local numArrows, inRange, unit, GPS
+local Update = function(self, elapsed)
+	if self.elapsed and self.elapsed > (self.throttle or minThrottle)  then
+		numArrows = 0;
+		for _, object in next, _FRAMES do
+			if object:IsShown()  then
+				GPS = object.GPS;
+				unit = object.unit;
+				if unit  then
+					if unit and GPS.outOfRange  then
+						inRange = true;
+					end
+
+					if not unit or not (UnitInParty(unit) or UnitInRaid(unit)) or UnitIsUnit(unit, "player") or not UnitIsConnected(unit) or (GPS.onMouseOver and (GetMouseFocus() ~= object)) or (GPS.outOfRange and inRange)  then
+						GPS:Hide()
+					else
+						local angle = GetAngle("player", unit);
+						if angle == nil  then
+							GPS:Hide();
+						else
+							GPS:Show();
+							RotateTexture(GPS.Texture, angle);
+
+							numArrows = numArrows + 1;
+						end
+					end
+				else
+					GPS:Hide();
+				end
+			end
+		end
+
+		self.elapsed = 0;
+		self.throttle = max(minThrottle, 0.005 * numArrows);
+	else
+		self.elapsed = (self.elapsed or 0) + tonumber(elapsed);
+	end
+end
+
+local Enable = function(self)
+	local GPS = self.GPS
+	if GPS then
+		tinsert(_FRAMES, self)
+
+		if not OnUpdateFrame then
+			OnUpdateFrame = CreateFrame("Frame")
+			OnUpdateFrame:SetScript("OnUpdate", function()
+				Update(this, arg1)
+			end)
+		end
+
+		OnUpdateFrame:Show()
+		return true
+	end
+end
+
+local Disable = function(self)
+	local GPS = self.GPS
+	if GPS then
+		for k, frame in next, _FRAMES do
+			if frame == self then
+				tremove(_FRAMES, k)
+				GPS:Hide()
+				break
+			end
+		end
+
+		if getn(_FRAMES) == 0 and OnUpdateFrame then
+			OnUpdateFrame:Hide()
+		end
+	end
+end
+
+oUF:AddElement("GPS", function() end, Enable, Disable)

ElvUI/Libraries/oUF_Plugins/oUF_GPS/oUF_GPS.xml

@@ -0,0 +1,3 @@
+<Ui xmlns="http://www.blizzard.com/wow/ui/">
+	<Script file="oUF_GPS.lua"/>
+</Ui>

ElvUI/Libraries/oUF_Plugins/oUF_Plugins.xml

@@ -1,4 +1,5 @@
 <Ui xmlns="http://www.blizzard.com/wow/ui/">
 	<Include file="oUF_AuraBars\oUF_AuraBars.xml"/>
 	<Include file="oUF_Smooth\oUF_Smooth.xml"/>
+	<Include file="oUF_GPS\oUF_GPS.xml"/>
 </Ui>