-- Id: 21467
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=19120

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-- Indicator profile initialization routine
-- Defines indicator profile properties and indicator parameters
-- TODO: Add minimal and maximal value of numeric parameters and default color of the streams
function Init()
    indicator:name("Intraday Intensity Index without normalization");
    indicator:description("Intraday Intensity Index without normalization");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);

    indicator.parameters:addGroup("Calculation"); 
    indicator.parameters:addInteger("Period", "Period", "", 21);
 
    indicator.parameters:addGroup("Style");
    indicator.parameters:addColor("III_color", "Color of III", "Color of III", core.rgb(255, 0, 0));
 

end

-- Indicator instance initialization routine
-- Processes indicator parameters and creates output streams
-- TODO: Refine the first period calculation for each of the output streams.
-- TODO: Calculate all constants, create instances all subsequent indicators and load all required libraries
-- Parameters block
local Period;

local first;
local source = nil;

-- Streams block
local III = nil;
local Raw;
 
-- Routine
function Prepare(nameOnly)
   Period = instance.parameters.Period;
    source = instance.source;
    first = source:first()+Period;
     
    local name = profile:id() .. "(" .. source:name() .. ", ".. tostring(Period)  .. ")";
    instance:name(name);
	
	if   (nameOnly) then
        return;
    end
    
    Raw = instance:addInternalStream(0, 0);

 
    III = instance:addStream("III", core.Bar, name, "III", instance.parameters.III_color, first);
    III:setPrecision(math.max(2, instance.source:getPrecision()));
 
end

-- Indicator calculation routine
-- TODO: Add your code for calculation output values
function Update(period, mode)
    if period < source:first()  then
    return;   
    end
    
	
	--Sum21 ((2C-H-L)/(H-L))xV
	
    if (source.high[period]-source.low[period] )~= 0  and source.volume[period] ~=0  then
    Raw[period]= ((2*source.close[period]-source.high[period]-source.low[period])/(source.high[period]-source.low[period]))*source.volume[period];  
    end
	
     
	if period < first then
	return;
	end
	
	III[period]= mathex.sum(Raw, period-Period+1,period);
    
    
end