Barrier Builder

SWEP.PrintName          = "Barrier Kit"
SWEP.Author         = "jamiemarlin"
SWEP.Instructions       = "left mouse click to start building a barrier"

SWEP.Spawnable = true
SWEP.AdminOnly = true

SWEP.Primary.ClipSize       = 5
SWEP.Primary.DefaultClip    = 1
SWEP.Primary.Automatic      = false
SWEP.Primary.Ammo       = "Barrier"

SWEP.Secondary.ClipSize     = -1
SWEP.Secondary.DefaultClip  = -1
SWEP.Secondary.Automatic    = false
SWEP.Secondary.Ammo     = "none"

SWEP.Weight         = 10
SWEP.AutoSwitchTo       = false
SWEP.AutoSwitchFrom     = false

SWEP.Slot           = 2
SWEP.SlotPos            = 2
SWEP.DrawAmmo           = true
SWEP.DrawCrosshair      = true

SWEP.ViewModel          = "models/weapons/v_pistol.mdl"
SWEP.WorldModel         = "models/weapons/w_pistol.mdl"


-- Called when the left mouse button is pressed
function SWEP:PrimaryAttack()
    self:SetNextPrimaryFire( CurTime() + 12.0 )

    self:PlaceItem( "models\props_phx\construct\concrete_barrier00.mdl" )
end


-- Called when the rightmouse button is pressed
function SWEP:SecondaryAttack()
    -- Though the secondary fire isn't automatic
    -- players shouldn't be able to fire too fast
    self:SetNextSecondaryFire( CurTime() + 12.0 )

    self:PlaceItem( "models\props_phx\construct\concrete_barrier00.mdl" )
end

-- A custom function we added. When you call this the player will fire a chair!
function SWEP:PlaceItem( model_file )
    local owner = self:GetOwner()

    -- Make sure the weapon is being held before trying to throw a chair
    if ( not owner:IsValid() ) then return end

    -- Play the shoot sound we precached earlier!

    -- If we're the client then this is as much as we want to do.
    -- We play the sound above on the client due to prediction.
    -- ( if we didn't they would feel a ping delay during multiplayer )
    if ( CLIENT ) then return end

    -- Create a prop_physics entity
    local ent = ents.Create( "prop_physics" )

    -- Always make sure that created entities are actually created!
    if ( not ent:IsValid() ) then return end

    -- Set the entity's model to the passed in model
    ent:SetModel( model_file )

    -- This is the same as owner:EyePos() + (self.Owner:GetAimVector() * 16)
    -- but the vector methods prevent duplicitous objects from being created
    -- which is faster and more memory efficient
    -- AimVector is not directly modified as it is used again later in the function
    local aimvec = owner:GetAimVector()
    local pos = aimvec * 16 -- This creates a new vector object
    pos:Add( owner:EyePos() ) -- This translates the local aimvector to world coordinates

    -- Set the position to the player's eye position plus 16 units forward.
    ent:SetPos( pos )

    -- Set the angles to the player'e eye angles. Then spawn it.
    ent:SetAngles( owner:EyeAngles() )
    ent:EnableMotion(false)
    ent:SetHealth(200)
    ent:Spawn()

    -- Now get the physics object. Whenever we get a physics object
    -- we need to test to make sure its valid before using it.
    -- If it isn't then we'll remove the entity.
    local phys = ent:GetPhysicsObject()
    if ( not phys:IsValid() ) then ent:Remove() return end

    -- Now we apply the force - so the chair actually throws instead
    -- of just falling to the ground. You can play with this value here
    -- to adjust how fast we throw it.
    -- Now that this is the last use of the aimvector vector we created,
    -- we can directly modify it instead of creating another copy

    -- Assuming we're playing in Sandbox mode we want to add this
    -- entity to the cleanup and undo lists. This is done like so.
    cleanup.Add( owner, "props", ent )

    undo.Create( "Placed_Barrier" )
        undo.AddEntity( ent )
        undo.SetPlayer( owner )
    undo.Finish()
    -- A lot of items can clutter the workspace.
    -- To fix this we add a 10 second delay to remove the chair after it was spawned.
    -- ent:IsValid() checks if the item still exists before removing it, eliminating errors.

end