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lua/weapons/tfa_gun_base/client/fov.lua

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+--[[
+| This file was obtained through the combined efforts
+| of Madbluntz & Plymouth Antiquarian Society.
+|
+| Credits: lifestorm, Gregory Wayne Rossel JR.,
+| 	Maloy, DrPepper10 @ RIP, Atle!
+|
+| Visit for more: https://plymouth.thetwilightzone.ru/
+--]]
+
+
+-- Copyright (c) 2018-2020 TFA Base Devs
+
+-- Permission is hereby granted, free of charge, to any person obtaining a copy
+-- of this software and associated documentation files (the "Software"), to deal
+-- in the Software without restriction, including without limitation the rights
+-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+-- copies of the Software, and to permit persons to whom the Software is
+-- furnished to do so, subject to the following conditions:
+
+-- The above copyright notice and this permission notice shall be included in all
+-- copies or substantial portions of the Software.
+
+-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+-- SOFTWARE.
+
+local LocalPlayer = LocalPlayer
+local math = math
+
+local function GetScreenAspectRatio()
+	return ScrW() / ScrH()
+end
+
+local function ScaleFOVByWidthRatio(fovDegrees, ratio)
+	local halfAngleRadians = fovDegrees * (0.5 * math.pi / 180.0)
+	local t = math.tan(halfAngleRadians)
+	t = t * ratio
+	local retDegrees = (180.0 / math.pi) * math.atan(t)
+
+	return retDegrees * 2.0
+end
+
+local default_fov_cv = GetConVar("default_fov")
+
+function SWEP:GetTrueFOV()
+	local fov = TFADUSKFOV or default_fov_cv:GetFloat()
+	local ply = LocalPlayer()
+
+	if not ply:IsValid() then return fov end
+
+	if ply:GetFOV() < ply:GetDefaultFOV() - 1 then
+		fov = ply:GetFOV()
+	end
+
+	if TFADUSKFOV_FINAL then
+		fov = TFADUSKFOV_FINAL
+	end
+
+	return fov
+end
+
+function SWEP:GetViewModelFinalFOV()
+	local fov_default = default_fov_cv:GetFloat()
+	local fov = self:GetTrueFOV()
+	local flFOVOffset = fov_default - fov
+	local fov_vm = self.ViewModelFOV - flFOVOffset
+	local aspectRatio = GetScreenAspectRatio() * 0.75 -- (4/3)
+	--local final_fov = ScaleFOVByWidthRatio( fov,  aspectRatio )
+	local final_fovViewmodel = ScaleFOVByWidthRatio(fov_vm, aspectRatio)
+
+	return final_fovViewmodel
+end