-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=60361
-- Id: 11230

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

    indicator.parameters:addGroup("Calculation");
    indicator.parameters:addInteger("Period1", "Period 1", "", 12);
    indicator.parameters:addInteger("Period2", "Period 2", "", 12);
    indicator.parameters:addInteger("Period3", "Period 3", "", 5);

    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 Period1;
local Period2;
local Period3;
local UpTicks, DnTicks;
local EMA_Up1, EMA_Dn1;
local EMA_Up2, EMA_Dn2;
local TV;
local EMA_TV;
local TVI=nil;
local pipSize;

function Prepare(nameOnly)
    source = instance.source;
    Period1=instance.parameters.Period1;
    Period2=instance.parameters.Period2;
    Period3=instance.parameters.Period3;
   
    local name = profile:id() .. "(" .. source:name() .. ", " .. instance.parameters.Period1 .. ", " .. instance.parameters.Period2 .. ", " .. instance.parameters.Period3 .. ")";
    instance:name(name);
    if nameOnly then
        return;
    end
    UpTicks = instance:addInternalStream(0, 0);
    DnTicks = instance:addInternalStream(0, 0);
    TV = instance:addInternalStream(0, 0);
    EMA_Up1 = core.indicators:create("EMA", UpTicks, Period1);
    EMA_Dn1 = core.indicators:create("EMA", DnTicks, Period1);
    EMA_Up2 = core.indicators:create("EMA", EMA_Up1.DATA, Period2);
    EMA_Dn2 = core.indicators:create("EMA", EMA_Dn1.DATA, Period2);
    first = EMA_Dn2.DATA:first();	
    EMA_TV = core.indicators:create("EMA", TV, Period3);
    TVI = instance:addStream("TVI", core.Line, name .. ".TVI", "TVI", instance.parameters.clr, EMA_TV.DATA:first());
    TVI:setPrecision(math.max(2, instance.source:getPrecision()));
    TVI:setWidth(instance.parameters.widthLinReg);
    TVI:setStyle(instance.parameters.styleLinReg);
    pipSize=source:pipSize();
end

function Update(period, mode)
  
    UpTicks[period]=(source.volume[period]+(source.close[period]-source.open[period])/pipSize)/2;
    DnTicks[period]=source.volume[period]-UpTicks[period];
	 
   
    EMA_Up1:update(mode);
    EMA_Dn1:update(mode);
    EMA_Up2:update(mode);
    EMA_Dn2:update(mode);
	
   if period<first then
   return;
   end
   
    local sum=EMA_Up2.DATA[period]+EMA_Dn2.DATA[period];
    if sum~=0 then
     TV[period]=100*(EMA_Up2.DATA[period]-EMA_Dn2.DATA[period])/sum;
    end 
	
   if period<EMA_TV.DATA:first() then
   return;
   end
   
    EMA_TV:update(mode);
    TVI[period]=EMA_TV.DATA[period];
  
end