-- Id: 9943
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=59441

--+------------------------------------------------------------------+
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--|                                            http://fxcodebase.com |
--+------------------------------------------------------------------+
--|                                      Developed by : Mario Jemic  |
--|                                          mario.jemic@gmail.com   |
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--+------------------------------------------------------------------+

function Init()
    indicator:name("Rainbow Chart");
    indicator:description("Rainbow Chart");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Indicator);
    indicator.parameters:addGroup("Calculation");	
    indicator.parameters:addInteger("Number", "Number of MAs", "Number of MAs", 10);
    indicator.parameters:addInteger("Period", "MA Period", "MA Period", 2);
	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:addInteger("width", "Line width", "", 1, 1, 5);
    indicator.parameters:addInteger("style", "Line style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("style", core.FLAG_LINE_STYLE);
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 Number;
local Period;
local Method;
local first={};
local source = nil;
local ma={};
-- Streams block
local MA = {};

-- Routine
function Prepare(nameOnly)
   
	Method = instance.parameters.Method;
    Number = instance.parameters.Number;
    Period = instance.parameters.Period;
    source = instance.source;

    local name = profile:id() .. "(" .. source:name() .. ", " .. tostring(Number) .. ", " .. tostring(Period) .. ")";
    instance:name(name);

    if (not (nameOnly)) then
        local i;
        for i = 1, Number, 1 do
            assert(core.indicators:findIndicator(Method) ~= nil, Method .. " indicator must be installed");
            if i == 1 then
            ma[i] = core.indicators:create(Method, source, Period);
            else
            ma[i] = core.indicators:create(Method, ma[i-1].DATA, Period);
            end
            first[i] = ma[i].DATA:first();
            MA[i] = instance:addStream("MA"..i, core.Line, name, "MA ".. i,  Coloring (( 100/Number)*i, 50), first[i]);
            MA[i]:setWidth(instance.parameters.width);
            MA[i]:setStyle(instance.parameters.style);
		end
    end
end

-- Indicator calculation routine
-- TODO: Add your code for calculation output values
function Update(period, mode)
    if not source:hasData(period) then
	return;
	end
	
	local i;
	for i = 1, Number, 1 do	
	 ma[i]:update(mode); 
	 if period >= first[i]  then
	 MA[i][period] = ma[i].DATA[period];
	 end
	end
       
    
end


function Coloring (value, mid)

local color;

if value <= mid then
color = core.rgb(255 * (value / mid), 255, 0) 
else 
color = core.rgb(255, 255 - 255 * ((value - mid) / mid), 0)
end


return  color;

end