wnsrc/gamemodes/sandbox/entities/weapons/gmod_tool/stools/elastic.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/
--]]


TOOL.Category = "Constraints"
TOOL.Name = "#tool.elastic.name"

TOOL.ClientConVar[ "constant" ] = "500"
TOOL.ClientConVar[ "damping" ] = "3"
TOOL.ClientConVar[ "rdamping" ] = "0.01"
TOOL.ClientConVar[ "material" ] = "cable/cable"
TOOL.ClientConVar[ "width" ] = "2"
TOOL.ClientConVar[ "stretch_only" ] = "1"
TOOL.ClientConVar[ "color_r" ] = "255"
TOOL.ClientConVar[ "color_g" ] = "255"
TOOL.ClientConVar[ "color_b" ] = "255"

TOOL.Information = {
	{ name = "left", stage = 0 },
	{ name = "left_1", stage = 1 },
	{ name = "reload" }
}

function TOOL:LeftClick( trace )

	if ( IsValid( trace.Entity ) && trace.Entity:IsPlayer() ) then return end

	-- If there's no physics object then we can't constraint it!
	if ( SERVER && !util.IsValidPhysicsObject( trace.Entity, trace.PhysicsBone ) ) then return false end

	local iNum = self:NumObjects()

	local Phys = trace.Entity:GetPhysicsObjectNum( trace.PhysicsBone )
	self:SetObject( iNum + 1, trace.Entity, trace.HitPos, Phys, trace.PhysicsBone, trace.HitNormal )

	if ( iNum > 0 ) then

		if ( CLIENT ) then

			self:ClearObjects()
			return true

		end

		-- Get client's CVars
		local width = self:GetClientNumber( "width" )
		local material = self:GetClientInfo( "material" )
		local damping = self:GetClientNumber( "damping" )
		local rdamping = self:GetClientNumber( "rdamping" )
		local constant = self:GetClientNumber( "constant" )
		local stretchonly = self:GetClientNumber( "stretch_only" )
		local colorR = self:GetClientNumber( "color_r" )
		local colorG = self:GetClientNumber( "color_g" )
		local colorB = self:GetClientNumber( "color_b" )

		-- Get information we're about to use
		local Ent1, Ent2 = self:GetEnt( 1 ), self:GetEnt( 2 )
		local Bone1, Bone2 = self:GetBone( 1 ), self:GetBone( 2 )
		local LPos1, LPos2 = self:GetLocalPos( 1 ),	self:GetLocalPos( 2 )

		-- Create the constraint
		local constr, rope = constraint.Elastic( Ent1, Ent2, Bone1, Bone2, LPos1, LPos2, constant, damping, rdamping, material, width, stretchonly, Color( colorR, colorG, colorB, 255 ) )

		-- Create an undo if the constraint was created
		if ( IsValid( constr ) ) then
			undo.Create( "Elastic" )
				undo.AddEntity( constr )
				self:GetOwner():AddCleanup( "ropeconstraints", constr )

				if ( IsValid( rope ) ) then
					undo.AddEntity( rope )
					self:GetOwner():AddCleanup( "ropeconstraints", rope )
				end
				undo.SetPlayer( self:GetOwner() )
			undo.Finish()
		end

		-- Clear the objects so we're ready to go again
		self:ClearObjects()

	else

		self:SetStage( iNum + 1 )

	end

	return true

end

function TOOL:Reload( trace )

	if ( !IsValid( trace.Entity ) || trace.Entity:IsPlayer() ) then return false end
	if ( CLIENT ) then return true end

	return constraint.RemoveConstraints( trace.Entity, "Elastic" )

end

function TOOL:Holster()

	self:ClearObjects()

end

local ConVarsDefault = TOOL:BuildConVarList()

function TOOL.BuildCPanel( CPanel )

	CPanel:AddControl( "Header", { Description = "#tool.elastic.help" } )

	CPanel:AddControl( "ComboBox", { MenuButton = 1, Folder = "elastic", Options = { [ "#preset.default" ] = ConVarsDefault }, CVars = table.GetKeys( ConVarsDefault ) } )

	CPanel:AddControl( "Slider", { Label = "#tool.elastic.constant", Command = "elastic_constant", Type = "Float", Min = 0, Max = 4000, Help = true } )
	CPanel:AddControl( "Slider", { Label = "#tool.elastic.damping", Command = "elastic_damping", Type = "Float", Min = 0, Max = 50, Help = true } )
	CPanel:AddControl( "Slider", { Label = "#tool.elastic.rdamping", Command = "elastic_rdamping", Type = "Float", Min = 0, Max = 1, Help = true } )
	CPanel:AddControl( "CheckBox", { Label = "#tool.elastic.stretchonly", Command = "elastic_stretch_only", Help = true } )

	CPanel:AddControl( "Slider", { Label = "#tool.elastic.width", Command = "elastic_width", Type = "Float", Min = 0, Max = 20 } )
	CPanel:AddControl( "RopeMaterial", { Label = "#tool.elastic.material", ConVar = "elastic_material" } )
	CPanel:AddControl( "Color", { Label = "#tool.elastic.color", Red = "elastic_color_r", Green = "elastic_color_g", Blue = "elastic_color_b" } )

end