-- Id: 11145
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=60316

--+------------------------------------------------------------------+
--|                               Copyright © 2018, Gehtsoft USA LLC |
--|                                            http://fxcodebase.com |
--+------------------------------------------------------------------+
--|                                      Developed by : Mario Jemic  |
--|                                          mario.jemic@gmail.com   |
--+------------------------------------------------------------------+
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--+------------------------------------------------------------------+

function Init()
    indicator:name("MA Cross Dot");
    indicator:description("MVA/EMA Cross Dot");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Indicator);
	indicator.parameters:addGroup("Method One");
	indicator.parameters:addInteger("SF", "First Averege Period", "First Averege  Period", 20);
	indicator.parameters:addString("Method1", "MA Method", "Method" , "MVA");
    indicator.parameters:addStringAlternative("Method1", "MVA", "MVA" , "MVA");
    indicator.parameters:addStringAlternative("Method1", "EMA", "EMA" , "EMA");
	indicator.parameters:addStringAlternative("Method1", "LWMA", "LWMA" , "LWMA");
    indicator.parameters:addStringAlternative("Method1", "TMA", "TMA" , "TMA");
    indicator.parameters:addStringAlternative("Method1", "SMMA", "SMMA" , "SMMA");
    indicator.parameters:addStringAlternative("Method1", "KAMA", "KAMA" , "KAMA");
    indicator.parameters:addStringAlternative("Method1", "HMA", "HMA" , "HMA");
    indicator.parameters:addStringAlternative("Method1", "WMA", "WMA" , "WMA");
	indicator.parameters:addStringAlternative("Method1", "VAMA", "VAMA" , "VAMA");	
	indicator.parameters:addStringAlternative("Method1", "NONLAGMA", "NONLAGMA", "NONLAGMA"); 
	
	indicator.parameters:addString("Type1", "Price Type", "", "close");
    indicator.parameters:addStringAlternative("Type1", "OPEN", "", "open");
    indicator.parameters:addStringAlternative("Type1", "HIGH", "", "high");
    indicator.parameters:addStringAlternative("Type1", "LOW", "", "low");
    indicator.parameters:addStringAlternative("Type1","CLOSE", "", "close");
    indicator.parameters:addStringAlternative("Type1", "MEDIAN", "", "median");
    indicator.parameters:addStringAlternative("Type1", "TYPICAL", "", "typical");
    indicator.parameters:addStringAlternative("Type1", "WEIGHTED", "", "weighted");
	
	
	indicator.parameters:addGroup("Method Two");
	indicator.parameters:addInteger("LF", "Second Averege Period", "Second Averege Period", 100);
	indicator.parameters:addString("Method2", "MA Method", " " , "MVA");
    indicator.parameters:addStringAlternative("Method2", "MVA", "MVA" , "MVA");
    indicator.parameters:addStringAlternative("Method2", "EMA", "EMA" , "EMA");
	indicator.parameters:addStringAlternative("Method2", "LWMA", "LWMA" , "LWMA");
    indicator.parameters:addStringAlternative("Method2", "TMA", "TMA" , "TMA");
    indicator.parameters:addStringAlternative("Method2", "SMMA", "SMMA" , "SMMA");
    indicator.parameters:addStringAlternative("Method2", "KAMA", "KAMA" , "KAMA");
    indicator.parameters:addStringAlternative("Method2", "HMA", "HMA" , "HMA");
    indicator.parameters:addStringAlternative("Method2", "WMA", "WMA" , "WMA");
	indicator.parameters:addStringAlternative("Method2", "VAMA", "VAMA" , "VAMA");	
	indicator.parameters:addStringAlternative("Method2", "NONLAGMA", "NONLAGMA", "NONLAGMA"); 
	
	
	indicator.parameters:addString("Type2", "Price Type", "", "close");
    indicator.parameters:addStringAlternative("Type2", "OPEN", "", "open");
    indicator.parameters:addStringAlternative("Type2", "HIGH", "", "high");
    indicator.parameters:addStringAlternative("Type2", "LOW", "", "low");
    indicator.parameters:addStringAlternative("Type2","CLOSE", "", "close");
    indicator.parameters:addStringAlternative("Type2", "MEDIAN", "", "median");
    indicator.parameters:addStringAlternative("Type2", "TYPICAL", "", "typical");
    indicator.parameters:addStringAlternative("Type2", "WEIGHTED", "", "weighted");
     
	
	indicator.parameters:addGroup("Style");	

    indicator.parameters:addColor("Up", "Color of Up", "Color of Up", core.rgb( 0, 255, 0));
    indicator.parameters:addColor("Down", "Color of Down", "Color of Down", core.rgb(255, 0, 0));
	indicator.parameters:addInteger("Size", "Font Size", "Font Size", 20);
	indicator.parameters:addBoolean("Show", "Show MA Lines", "" , false); 
	
	indicator.parameters:addColor("color1", "Color of Short MA", "Color of Short MA", core.rgb( 0, 255, 0));
	indicator.parameters:addInteger("width1", "Line width", "", 1, 1, 5);
    indicator.parameters:addInteger("style1", "Line style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("style1", core.FLAG_LINE_STYLE);
	
	indicator.parameters:addColor("color2", "Color of Long MA", "Color of Long MA", core.rgb( 255, 0, 0));
	indicator.parameters:addInteger("width2", "Line width", "", 1, 1, 5);
    indicator.parameters:addInteger("style2", "Line style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("style2", core.FLAG_LINE_STYLE);
	
	indicator.parameters:addGroup("Non Lag MA Parameters One");   
    indicator.parameters:addInteger("Filter1", "Filter", "Filter", 0);
    indicator.parameters:addInteger("ColorBarBack1", "ColorBarBack", "ColorBarBack", 2);
    indicator.parameters:addDouble("Deviation1", "Deviation", "Deviation", 0);
	
	indicator.parameters:addGroup("Non Lag MA Parameters Two");   
    indicator.parameters:addInteger("Filter2", "Filter", "Filter", 0);
    indicator.parameters:addInteger("ColorBarBack2", "ColorBarBack", "ColorBarBack", 2);
    indicator.parameters:addDouble("Deviation2", "Deviation", "Deviation", 0);
	
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 ShortFrame=nil;
local LongFrame=nil;
local Method1=nil;
local Method2=nil;
local Filter1;
local ColorBarBack1;
local Deviation1;
local Filter2;
local ColorBarBack2;
local Deviation2;

local first;
local source = nil;

-- Streams block
local LongDATA = nil;
local ShortDATA = nil;

local Type1;
local Type2;
local font;
local Size;
local Show;
-- Routine
function Prepare(nameOnly)

    Filter1=instance.parameters.Filter1;
    ColorBarBack1=instance.parameters.ColorBarBack1;
    Deviation1=instance.parameters.Deviation1;
	Size=instance.parameters.Size;
	Show=instance.parameters.Show;
		
    font = core.host:execute("createFont", "Wingdings", Size, false, false);
  	
	Filter2=instance.parameters.Filter2;
    ColorBarBack2=instance.parameters.ColorBarBack2;
    Deviation2=instance.parameters.Deviation2;
	
	Type1=instance.parameters.Type1;
	Type2=instance.parameters.Type2;
   
   
    ShortFrame = instance.parameters.SF;
    LongFrame = instance.parameters.LF;
	Method1 = instance.parameters.Method1;
	Method2 = instance.parameters.Method2;
	
    source = instance.source;
    first = source:first();
   
   
    local name = profile:id() .. "(" .. source:name() .. ", " .. ShortFrame .. ", " .. LongFrame.. ", " .. Method1.. ", ".. Method2  .. ")";
    instance:name(name);
    if nameOnly then
        return;
    end
    assert(core.indicators:findIndicator(Method1) ~= nil, "Please, download and install "..Method1..  " indicator");
	assert(core.indicators:findIndicator(Method2) ~= nil, "Please, download and install "..Method2..  " indicator");
	
	
	if Method1 == "VAMA" then
	LongDATA= core.indicators:create(Method1, source, ShortFrame);
	elseif   Method1 == "NONLAGMA" then
	LongDATA= core.indicators:create(Method1, source[Type1], ShortFrame, Filter1, ColorBarBack1,Deviation1,true);
	else
	LongDATA= core.indicators:create(Method1, source[Type1], ShortFrame);
	end
	
	if Method2 == "VAMA" then
	ShortDATA= core.indicators:create(Method2, source, LongFrame);
	elseif   Method2 == "NONLAGMA" then
	ShortDATA= core.indicators:create(Method2, source[Type2], LongFrame, Filter2, ColorBarBack2,Deviation2,true);
	else
	ShortDATA= core.indicators:create(Method2, source[Type2], LongFrame);
	end
	
	first = math.max(ShortDATA.DATA:first(),LongDATA.DATA:first());
	
	if Show then   
   short=instance:addStream("SHORT", core.Line, name, "Short", instance.parameters.color1, first);
   short:setWidth(instance.parameters.width1);
   short:setStyle(instance.parameters.style1);
   long=instance:addStream("LONG", core.Line, name, "Long",  instance.parameters.color2, first);
   long:setWidth(instance.parameters.width2);
   long:setStyle(instance.parameters.style2);
   else
   short=instance:addInternalStream(first, 0);
   long=instance:addInternalStream(first, 0);
   end
  
end

-- Indicator calculation routine
-- TODO: Add your code for calculation output values
function Update(period,mode)

    LongDATA:update(mode);
	ShortDATA:update(mode);
	core.host:execute ("removeLabel", source:serial(period));
		
    if period < first or not source:hasData(period) then
	return;
	end
	
   short[period]=ShortDATA.DATA[period];
   long[period]=LongDATA.DATA[period];
				
						if ShortDATA.DATA[period]>  LongDATA.DATA[period]   and  ShortDATA.DATA[period-1]<=  LongDATA.DATA[period-1]then	
						local x,y;	 	
						local a1, b1= getline(period-1, ShortDATA.DATA[period-1], period, ShortDATA.DATA[period])
						local a2, b2=  getline(period-1, LongDATA.DATA[period-1], period, LongDATA.DATA[period])
						x,y=intersect(a1, b1, a2, b2);
                        core.host:execute("drawLabel1", source:serial(period), source:date(period),core.CR_CHART, y, core.CR_CHART, core.H_Center, core.V_Center, font,  instance.parameters.Up, "\108");						
						end
						
						if ShortDATA.DATA[period]<  LongDATA.DATA[period]   and  ShortDATA.DATA[period-1]>=  LongDATA.DATA[period-1]then	
                        local x,y;	 	
						local a1, b1= getline(period-1, ShortDATA.DATA[period-1], period, ShortDATA.DATA[period])
						local a2, b2=  getline(period-1, LongDATA.DATA[period-1], period, LongDATA.DATA[period])
						x,y=intersect(a1, b1, a2, b2);						
                        x,y=intersect(a1, b1, a2, b2);
						core.host:execute("drawLabel1", source:serial(period), source:date(period),core.CR_CHART, y, core.CR_CHART, core.H_Center, core.V_Center, font,  instance.parameters.Down, "\108");								
						end
		
   
end

function getline(x1, y1, x2, y2)
    local a, b;

    a = ((y2 - y1) / (x2 - x1));
    b = (y1 - a * x1);
    return a, b;
end

function intersect(a1, b1, a2, b2)
    local x, y;

    -- collinear
    if a1 == a2 then
        return nil, nil;
    end

    x = (b2 - b1) / (a1 - a2);
    y = a1 * x + b1;
    return x, y;
end


function ReleaseInstance()
       core.host:execute("deleteFont", font);

end