-- More information about this indicator can be found at:
-- https://fxcodebase.com/code/viewtopic.php?f=17&t=71718

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-- Indicator profile initialization routine

function Init()
    indicator:name("Amplitude");
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);
	
	indicator.parameters:addGroup("Calculation"); 
    indicator.parameters:addInteger("Period", "Period", "", 64, 1, 2000);
	indicator.parameters:addBoolean("IgnoreGaps", "Ignore Gaps", "", true);
	indicator.parameters:addBoolean("ShowPercentage", "Show Percentage", "", true);
	
	indicator.parameters:addGroup("Style"); 	
    indicator.parameters:addColor("color", "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 IgnoreGaps; 
local ShowPercentage;
local Period; 
local first;
local source = nil; 
local Oscillator;  
local Average;
local Low, High;
-- Routine
 function Prepare(nameOnly)   
 
 
    Period= instance.parameters.Period;
	IgnoreGaps= instance.parameters.IgnoreGaps;
	ShowPercentage= instance.parameters.ShowPercentage;
	
	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;
	
    Low= instance:addInternalStream(0, 0);
    High= instance:addInternalStream(0, 0);  
 
	Oscillator = instance:addStream("Oscillator" , core.Line, " Oscillator"," Oscillator",instance.parameters.color, 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)

	period=period-1;
	
	if period < first
	then
	return;
	end
	

	
	local min=math.huge;
	local max=0; 
	  
	  if IgnoreGaps then	  
	  High[period]= math.max(source.high[period], math.max(source.high[period], source.close[period + 1]));
	  Low[period]= math.max(source.low[period], math.min(source.low[period], source.close[period + 1]));		  
	  else
	  High[period]= source.high[period];
	  Low[period]= source.low[period];	  
	  end
 
	  
	local min=mathex.min(Low, period-Period+1, period);
	local max=mathex.max(High, period-Period+1, period);	  
	
 
 
 
	if ShowPercentage then
    Oscillator[period+1]= ((max - min) * 100.0 / (math.abs(max + min) / 2.0));	
    else	
    Oscillator[period+1]= max - min;
	end
				  
end