-- More information about this indicator can be found at:
-- https://fxcodebase.com/code/viewtopic.php?f=17&t=71711

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-- Indicator profile initialization routine

function Init()
    indicator:name("Improved Directional Movement Indicator");
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);
	
	indicator.parameters:addGroup("Calculation"); 
    indicator.parameters:addInteger("Period", "Period", "", 14, 1, 2000);

 
	
	indicator.parameters:addGroup("Style"); 	
    indicator.parameters:addColor("Up", "Up Line Color", "", core.rgb(0, 255, 0));
    indicator.parameters:addColor("Down", "Down Line Color", "", core.rgb(255, 0, 0));	
	indicator.parameters:addInteger("style", "Line Style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("style", core.FLAG_LEVEL_STYLE);	
	indicator.parameters:addInteger("width", "Line Width", "", 3, 1, 5);
	
end

-- Indicator instance initialization routine
-- Processes indicator parameters and creates output streams
-- Parameters block

 
local Period; 
local alpha;
local first;
local coeffsSum;
local source = nil;
 
local Oscillator;  
local Data;
local coeffs={};
-- Routine
 function Prepare(nameOnly)   
 
 
    Period= instance.parameters.Period;
	
	
	alpha= 1.0/Period;
    coeffsSum = 0;
	local coeff;
   
    for i=0, Period, 1 do
 
    coeff = 1.0 - math.cos((2*math.pi*(i+1))/(Period+1.0));
    coeffs[i]  = coeff;
    coeffsSum  = coeffsSum + coeff;
    end
	
	
	local Parameters= Period;
 
    local name = profile:id() .. "(" ..  instance.source:name() ..  ", " ..  Parameters .. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end

    
			
    source = instance.source; 
    first=source:first()+Period 
	
	Data= instance:addInternalStream(0, 0);
	--EMA= instance:addInternalStream(0, 0);   
 
	Oscillator = instance:addStream("Oscillator" , core.Line, " Oscillator"," Oscillator",instance.parameters.Up, first);
	Oscillator:setWidth(instance.parameters.width);
    Oscillator:setStyle(instance.parameters.style);
    Oscillator:setPrecision(math.max(2, source:getPrecision()));
	
	
end

-- Indicator calculation routine
function Update(period, mode)

 
	if period < first 
	then
	return;
	end
	
	
	local upperMove =   source.high[period]-source.high[period-1];
	local lowerMove =    source.low[period-1]- source.low[period];
	local plusDM    = 0;
	local minusDM   = 0;
	
	if (upperMove>lowerMove and upperMove>0)  then
	plusDM=upperMove;
	end

	if (lowerMove>upperMove and lowerMove>0)  then
	minusDM=lowerMove;
    end
		
     Data[period]= Data[period-1]  + alpha*((plusDM-minusDM) -Data[period-1]) ;
	 
    local  dSum = 0;      
	
	for i= 1 ,Period, 1 do
	dSum  = dSum + Data[period-i+1]* coeffs[i];
	end
	
 
	
	Oscillator[period]=	dSum/coeffsSum;		  
	
	if Oscillator[period]> Oscillator[period-1] then
	Oscillator:setColor(period, instance.parameters.Up);
	else
	Oscillator:setColor(period, instance.parameters.Down);
	end
end