-- Id: 10850
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=10878


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function Init()
    indicator:name("William Blau Momentum oscillator");
    indicator:description("William Blau Momentum oscillator");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);

    indicator.parameters:addGroup("Calculation");
    indicator.parameters:addInteger("Period", "Period", "", 2);
    indicator.parameters:addInteger("Smooth_Period1", "Smooth period 1", "", 20);
    indicator.parameters:addInteger("Smooth_Period2", "Smooth period 2", "", 5);
    indicator.parameters:addInteger("Smooth_Period3", "Smooth period 3", "", 3);

    indicator.parameters:addGroup("Style");
    indicator.parameters:addColor("clr", "Color", "Color", core.rgb(255, 255, 0));
    indicator.parameters:addInteger("widthLinReg", "Line width", "Line width", 1, 1, 5);
    indicator.parameters:addInteger("styleLinReg", "Line style", "Line style", core.LINE_SOLID);
    indicator.parameters:setFlag("styleLinReg", core.FLAG_LINE_STYLE);
end

local first;
local source = nil;
local Period;
local Smooth_Period1;
local Smooth_Period2;
local Smooth_Period3;
local Mtm;
local EMA1, EMA2, EMA3;
local Blau_Mtm=nil;

function Prepare(nameOnly)  
    source = instance.source;
    Period=instance.parameters.Period;
    Smooth_Period1=instance.parameters.Smooth_Period1;
    Smooth_Period2=instance.parameters.Smooth_Period2;
    Smooth_Period3=instance.parameters.Smooth_Period3;
    first = source:first()+2;
	
	 local name = profile:id() .. "(" .. source:name() .. ", " .. instance.parameters.Period .. ", " .. instance.parameters.Smooth_Period1 .. ", " .. instance.parameters.Smooth_Period2 .. ", " .. instance.parameters.Smooth_Period3 .. ")";
    instance:name(name);
	if   (nameOnly) then
        return;
    end
	
    Mtm = instance:addInternalStream(first, 0);
    EMA1 = core.indicators:create("EMA", Mtm, Smooth_Period1);
    EMA2 = core.indicators:create("EMA", EMA1.DATA, Smooth_Period2);
    EMA3 = core.indicators:create("EMA", EMA2.DATA, Smooth_Period3);
   
	
	
    Blau_Mtm = instance:addStream("Blau_Mtm", core.Line, name .. ".Blau_Mtm", "Blau_Mtm", instance.parameters.clr, EMA3.DATA:first());
    Blau_Mtm:setWidth(instance.parameters.widthLinReg);
    Blau_Mtm:setStyle(instance.parameters.styleLinReg);
	
	Blau_Mtm:setPrecision(math.max(2, instance.source:getPrecision()));
end

function Update(period, mode)
   if period>first+Period then
    Mtm[period]=source[period]-source[period-Period+1];
    EMA1:update(mode);
    EMA2:update(mode);
    EMA3:update(mode);
    Blau_Mtm[period]=EMA3.DATA[period];
   end 
end