-- Id: 7634

-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=24270

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function Init()
    indicator:name("Ma Delta");
    indicator:description("Ma Delta");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);


    indicator.parameters:addGroup("MA Calculation");
    indicator.parameters:addInteger("N", "Periods ", "Periods BB", 10, 1, 10000);
	indicator.parameters:addString("Method", "MA Method", "Method" , "MVA");
    indicator.parameters:addStringAlternative("Method", "MVA", "MVA" , "MVA");
    indicator.parameters:addStringAlternative("Method", "EMA", "EMA" , "EMA");
    indicator.parameters:addStringAlternative("Method", "LWMA", "LWMA" , "LWMA");
    indicator.parameters:addStringAlternative("Method", "TMA", "TMA" , "TMA");
    indicator.parameters:addStringAlternative("Method", "SMMA", "SMMA" , "SMMA");
    indicator.parameters:addStringAlternative("Method", "KAMA", "KAMA" , "KAMA");
    indicator.parameters:addStringAlternative("Method", "VIDYA", "VIDYA" , "VIDYA");
    indicator.parameters:addStringAlternative("Method", "WMA", "WMA" , "WMA");
	
    indicator.parameters:addGroup("Style");
    indicator.parameters:addColor("SMA", " MA Color", "MA", core.rgb(0, 0, 255));
	
	indicator.parameters:addInteger("width", "Line width", "", 1, 1, 5);
    indicator.parameters:addInteger("style", "Line style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("style", core.FLAG_LINE_STYLE);
	
	
	indicator.parameters:addGroup("OB/OS Levels");	
    indicator.parameters:addDouble("overbought", "Overbought/Oversold Level","", 0);
    indicator.parameters:addInteger("level_overboughtsold_width","Line width","", 1, 1, 5);
    indicator.parameters:addInteger("level_overboughtsold_style", "Line Style","", core.LINE_SOLID);
    indicator.parameters:addColor("level_overboughtsold_color", "Line Color","", core.rgb(128, 128, 128));
    indicator.parameters:setFlag("level_overboughtsold_style", core.FLAG_LEVEL_STYLE);

end

-- Indicator instance initialization routine
-- Processes indicator parameters and creates output streams
-- Parameters block
local N;
local Method;
local first;
local source = nil;
local DELTA, Filter;

local MA;
-- Routine
function Prepare(nameOnly) 

    N = instance.parameters.N;
	Method = instance.parameters.Method;
    Filter = instance.parameters.Filter;
    source = instance.source;
   

    local name = profile:id() .. "(" .. source:name() .. ", " .. N .. ", " ..Method.. ")";
    instance:name(name);  

    if   (nameOnly) then
        return;
    end	
    
	
    assert(core.indicators:findIndicator(Method) ~= nil, Method .. " indicator must be installed");
	MA = core.indicators:create(Method, source, N);
	 first = MA.DATA:first();
	 
	 
    DELTA = instance:addStream("DELTA", core.Line, name, "DELTA", instance.parameters.SMA, first);
    DELTA:addLevel(0);
    DELTA:addLevel(instance.parameters.overbought, instance.parameters.level_overboughtsold_style, instance.parameters.level_overboughtsold_width, instance.parameters.level_overboughtsold_color);
	DELTA:addLevel(-instance.parameters.overbought, instance.parameters.level_overboughtsold_style, instance.parameters.level_overboughtsold_width, instance.parameters.level_overboughtsold_color);    
	
	
    DELTA:setWidth(instance.parameters.width);
    DELTA:setStyle(instance.parameters.style);
    DELTA:setPrecision(math.max(2, instance.source:getPrecision())); 

   end

-- Indicator calculation routine
function Update(period, mode)
    if period < first then
	return;
	end
       
        MA:update(mode);
        DELTA [period] = (MA.DATA[period] - MA.DATA[period-1])/source:pipSize();
        
 end