wnsrc/lua/effects/tfa_tracer_gauss/init.lua

--[[
| 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 vector_origin = Vector()

EFFECT.Thickness = 16
EFFECT.Life = 0.25
EFFECT.RotVelocity = 30
EFFECT.InValid = false
local Mat_Impact = Material("effects/combinemuzzle2")
local Mat_Beam = Material("effects/tool_tracer")
local Mat_TracePart = Material("effects/select_ring")

function EFFECT:Init(data)
	self.Position = data:GetStart()
	self.WeaponEnt = data:GetEntity()
	self.Attachment = data:GetAttachment()

	if IsValid(self.WeaponEnt) and self.WeaponEnt.GetMuzzleAttachment then
		self.Attachment = self.WeaponEnt:GetMuzzleAttachment()
	end

	local owent

	if IsValid(self.WeaponEnt) then
		owent = self.WeaponEnt:GetOwner()

		if not IsValid(owent) then
			owent = self.WeaponEnt:GetParent()
		end
	end

	if IsValid(owent) and owent:IsPlayer() then
		if owent ~= LocalPlayer() or owent:ShouldDrawLocalPlayer() then
			self.WeaponEnt = owent:GetActiveWeapon()
			if not IsValid(self.WeaponEnt) then return end
		else
			self.WeaponEnt = owent:GetViewModel()
			local theirweapon = owent:GetActiveWeapon()

			if IsValid(theirweapon) and theirweapon.ViewModelFlip or theirweapon.ViewModelFlipped then
				self.Flipped = true
			end

			if not IsValid(self.WeaponEnt) then return end
		end
	end

	local angpos

	if IsValid(self.WeaponEnt) then
		angpos = self.WeaponEnt:GetAttachment(self.Attachment)
	end

	if not angpos or not angpos.Pos then
		angpos = {
			Pos = vector_origin,
			Ang = angle_zero
		}
	end


	if self.Flipped then
		local tmpang = (self.Dir or angpos.Ang:Forward()):Angle()
		local localang = self.WeaponEnt:WorldToLocalAngles(tmpang)
		localang.y = localang.y + 180
		localang = self.WeaponEnt:LocalToWorldAngles(localang)
		--localang:RotateAroundAxis(localang:Up(),180)
		--tmpang:RotateAroundAxis(tmpang:Up(),180)
		self.Dir = localang:Forward()
	end

	-- Keep the start and end Pos - we're going to interpolate between them
	if IsValid(owent) and self.Position:Distance(owent:EyePos()) > 72 then
		self.WeaponEnt = nil
	end

	self.StartPos = self:GetTracerShootPos(self.WeaponEnt and angpos.Pos or self.Position, self.WeaponEnt, self.Attachment)
	self.EndPos = data:GetOrigin()
	self.Entity:SetRenderBoundsWS(self.StartPos, self.EndPos)
	self.Normal = (self.EndPos - self.StartPos):GetNormalized()
	self.StartTime = 0
	self.LifeTime = self.Life
	self.data = data
	self.rot = 0
end

function EFFECT:Think()
	if self.InValid then return false end
	self.LifeTime = self.LifeTime - FrameTime()
	self.StartTime = self.StartTime + FrameTime()

	return self.LifeTime > 0
end

local beamcol = table.Copy(color_white)
local beamcol2 = Color(0, 225, 255, 255)

function EFFECT:Render()
	if self.InValid then return false end
	self.StartPos = self:GetTracerShootPos(self.StartPos, self.WeaponEnt, self.Attachment)
	local startPos = self.StartPos
	local endPos = self.EndPos
	local tracerpos
	beamcol.a = self.LifeTime / self.Life * 255
	self.rot = self.rot + FrameTime() * self.RotVelocity
	render.SetMaterial(Mat_Impact)
	render.DrawSprite(endPos, 12, 12, ColorAlpha(color_white, beamcol.a))
	render.SetMaterial(Mat_TracePart)
	tracerpos = Lerp(math.Clamp(self.LifeTime / self.Life - 0.1, 0, 1), endPos, startPos)
	render.DrawQuadEasy(tracerpos, self.Normal, 12, 12, beamcol2, self.rot - 60)
	tracerpos = Lerp(math.Clamp(self.LifeTime / self.Life - 0.05, 0, 1), endPos, startPos)
	render.DrawQuadEasy(tracerpos, self.Normal, 12, 12, beamcol2, self.rot - 30)
	tracerpos = Lerp(math.Clamp(self.LifeTime / self.Life, 0, 1), endPos, startPos)
	render.DrawQuadEasy(tracerpos, self.Normal, 12, 12, beamcol2, self.rot)
	tracerpos = Lerp(math.Clamp(self.LifeTime / self.Life + 0.05, 0, 1), endPos, startPos)
	render.DrawQuadEasy(tracerpos, self.Normal, 12, 12, beamcol2, self.rot + 30)
	tracerpos = Lerp(math.Clamp(self.LifeTime / self.Life + 0.1, 0, 1), endPos, startPos)
	render.DrawQuadEasy(tracerpos, self.Normal, 12, 12, beamcol2, self.rot + 60)
	tracerpos = Lerp(math.Clamp(self.LifeTime / self.Life + 0.15, 0, 1), endPos, startPos)
	render.DrawQuadEasy(tracerpos, self.Normal, 12, 12, beamcol2, self.rot + 30)
	tracerpos = Lerp(math.Clamp(self.LifeTime / self.Life + 0.2, 0, 1), endPos, startPos)
	render.DrawQuadEasy(tracerpos, self.Normal, 12, 12, beamcol2, self.rot + 60)
	render.SetMaterial(Mat_Beam)
	render.DrawBeam(startPos, endPos, self.Thickness, 0 + beamcol.a / 128, endPos:Distance(startPos) / 64 + beamcol.a / 128, beamcol)
end