more snapline shit

Hi Basically For My snaplines i want the outline to rotate around as the actual direction of the snapline changes, I keep fucking up the math but I'm Really close at the moment

Code:

local origin = v:GetPos();
snapendx = origin:ToScreen().x;
snapendy = origin:ToScreen().y;
snapstarty = ScrH()/2;
snapstartx = ScrW()/2;
local offsetx, offsety = SnapRotate();
if (math.abs(snapendx) < ScrW()*5 && math.abs(snapendy) < ScrH()*5) then
	surface.SetDrawColor(5,5,5)
		surface.DrawLine(snapstartx-offsetx, snapstarty-offsety, snapendx-offsetx, snapendy-offsety)
		surface.DrawLine(snapstartx+offsetx, snapstarty+offsety, snapendx+offsetx, snapendy+offsety)
	surface.SetDrawColor(color)
		surface.DrawLine(snapstartx, snapstarty, snapendx, snapendy)
end

That's the actual snapline and this is the rotation func()

Code:

local function SnapRotate()
	local _x = snapendx - snapstartx;
	local _y = snapendy - snapstarty;

	local snapangle = math.deg(math.atan2(_y,_x));
	
	if (snapangle > 0 && snapangle < 90) then
		_snapangle =  90 - snapangle;
		__snapangle = _snapangle - 90;
	elseif (snapangle > 90) then
		_snapangle =  (snapangle % 90);
		__snapangle = 90 - _snapangle;
	elseif (snapangle < 0 && snapangle > -90) then
		_snapangle =  90 - math.abs(snapangle);
		__snapangle = math.abs(snapangle);
	elseif (snapangle < -90) then
		_snapangle =  math.abs(snapangle) % 90;
		__snapangle = _snapangle - 90;
	end
	
	x = math.sin(math.rad(__snapangle));
	y = math.sin(math.rad(_snapangle));
	print(x,y)
	return x, y;
end

It's Functional but not p; I was wondering if any of you guys were capable of getting this shit gud