WoW:USERAPI GetPlayerBearing: Difference between revisions

WoW:USERAPI GetPlayerBearing (source)

Revision as of 07:51, 13 February 2010

1,135 bytes added , 13 February 2010

Fixed glitch when "Rotate Minimap" is enabled

Anonymous user

WoWWiki>Sdphantom

@@ Line 4: / Line 4: @@
 ==Return values==
-; bearing : number [0, 360] - the player's current bearing, 000 being North, 090 East, 180 South and 270 West; nil if the function is unable to determine the bearing.
+; bearing : number - The player's current bearing (in Radians).
 ==Example Implementation==
-  local function GetPlayerBearing()
+  local GetPlayerBearing;--	Local definition, remove to make global
-  	local obj; -- Remains an upvalue
+ do
-  	do
+ 	local math=math;--			Local pointer to the Math library
- 		local t = {Minimap:GetChildren()}; -- Becomes garbage
+  	local mmring=MinimapCompassTexture;--	Pointer to the Compass Ring
- 		for k, v in pairs(t) do
+  	local mmarrow;--			Upvalue to hold the pointer to the Player Arrow
- 			if v:IsObjectType("Model") and not v:GetName() and v:GetModel() == "interface\\minimap\\minimaparrow.m2" then
- 				obj = v; break;
+ --	Scan for Player Arrow Texture
- 			end
+ 	local list={Minimap:GetRegions()};
+ 	for i,j in pairs(list) do
+ --		Scan for a no-name texture with a specific file loaded.
+ 		if j:IsObjectType("Texture") and not j:GetName() and j:GetTexture():lower()=="interface\\minimap\\minimaparrow" then
+ 			mmarrow=j;--	Found it, save and stop scanning
+ 			break;
   		end
   	end
- 	if not obj then return; end
- 	-- If we've found what we were looking for, rewrite function to skip the search next time.
+ --	Function definition
-  	GetPlayerBearing = function() return (1-obj:GetFacing()/math.pi/2)*360; end
+  	GetPlayerBearing=function()
- 	return GetPlayerBearing();
+ 		local obj=GetCVar("rotateMinimap")=="1" and mmring or mmarrow;--	Use the correct texture
+ 		if not obj then return 0; end--						Hopefully this doesn't happen
+ 		local fx,fy,bx,by=obj:GetTexCoord();--	Only need front and back of one side (left is returned first)
+ 		local a,dx,dy=0,fx-bx,by-fy;--		Y-Axis flipped for textures so Y values are swapped
+ 		if obj==mmring then dx=-dx; end--	Compass Ring spins the opposite direction
+ 		if dy==0 then--				Can't divide by zero
+ 			a=dx<0 and math.pi or 0;--	Could either be one or the other in this condition
+ 		else
+ 			a=math.atan(dx/dy)+(dy<0 and math.pi or 0);--	atan() only returns half of the values we need, add PI when needed
+ 		end
+ 		return a;
+ 	end
   end
+== Notes ==
+The old code posted here broke due to a change in the Minimap object. The player arrow shown is no longer a Model frame, it's a Texture now.
+Also note '''atan()''' is not the same function as '''math.atan''', the first returns in Degrees while the later returns in Radians.
+Due to the returns on '''math.atan()''', the range this function returns with is between -0.5*PI and 1.5*PI