function SWEP:CalculateTrajectory( )
    local theta, g, d, v, tr, a, b, x, y, k, v, v2, v4, x2, p, q, n
    
    tr = util.TraceLine{ start = self.Owner:EyePos( ), endpos = self.Owner:EyePos( ) + self.Owner:GetAimVector( ) * 8192, filter = self.Owner, mask = MASK_SHOT }
    
    a = tr.HitPos
    b = self.Owner:EyePos( )
    
    a = a - b
    
    y = math.abs( a.z )
    
    a.z = 0
    
    d = a:Length( )
    
    g = self:GetGravAccel( )
    
    v = 500  --velocity of entity
    
    v2 = v * v
    v4 = v2 * v2
    x = d
    x2 = x * x
    
    k = math.atan( ( ( v2 + ( v4 - g * ( g * x2 + 2 * y * v2 ) ) ^ .5 ) / ( g * x ) ) )
    v = math.atan( ( ( v2 - ( v4 - g * ( g * x2 + 2 * y * v2 ) ) ^ .5 ) / ( g * x ) ) )
    
    if math.min( k, v ) == math.huge then
        --It isn't possible to hit it from here, according to this math
        self.State = "ASST ERR"
        self.TargetPos = nil
        self:EmitSound( self.Sounds.Error, 30 )
        return
    end
    
    k = 90 + math.deg( k )
    v = 90 + math.deg( v )
    
    p = tr.HitPos:ToScreen( )
    q = self.Owner:EyeAngles( )
    
    n = q.p
    
    q.p = n - math.min( k, v )
    
    self.LowPitch = q:Forward( ) * v * .5
    
    q.p = n - math.max( k, v )
    
    self.BigPitch = q:Forward( ) * v * .5
    
    self.TargetPos = tr.HitPos
    
    self.YCoord = ( self.Owner:GetShootPos( ) + q:Forward( ) * 6 ):ToScreen( ).y
    self.State = "ASST ON"
    
    self:EmitSound( self.Sounds.LockedOn, 30 )
end