Индикатор разницы объемов по положительным и отрицательным барам

--[[
MA volumn up down
--]]
Settings=              
        {                          
            Name = "MAV2_m",   -- indicator name
            per=10,               -- period			
            line=                                     
                {                               
                    {  
                        Name = "MA",
                        Type =TYPE_LINE,
                        Width = 1,
                        Color = RGB(0,0,0)
                    },
					{  
                        Name = "MA2",
                        Type =TYPE_LINE,
                        Width = 1,
                        Color = RGB(0,0,255)
                    }	
                }
       }


function Init()   
  mav1 = {}
  mav2 = {}  
  return 2
end


function OnCalculate(index)
  
  per = Settings.per
  
  if index > 1 then 
    curv = C(index)
    prevv = C(index-1)	
  else 
    curv = C(index)
    prevv = C(index)	
  end   
 
  if curv - prevv > 0 then 
    if index > 1 then 
      mav1[index] = mav1[index-1] + V(index)
	  mav2[index] = mav2[index-1] 
    else 
      mav1[index] = V(index)  
	  mav2[index] = 0
    end    
  else 
    if index > 1 then 
	  mav1[index] = mav1[index-1]
      mav2[index] = mav2[index-1] + V(index)
    else 
	  mav1[index] = 0
      mav2[index] = V(index)  
    end 
  end 
  
  if index > per then
    vv1 = mav1[index] - mav1[index-per]
	vv2 = mav2[index] - mav2[index-per]
  else 
    vv1 = 0
	vv2 = 0
  end   

  return 0, vv1 - vv2

end