-- Id: 12710
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=61323

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function Init()
    indicator:name("Fractal");
    indicator:description("Predicts a reversal in the current trend.");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Indicator);
    indicator:setTag("group", "Bill Williams");

	indicator.parameters:addGroup("Calculation");	 
	indicator.parameters:addBoolean("SignalMode", "Signal Mode", "", true);
	indicator.parameters:addGroup("Style");	
    indicator.parameters:addColor("clrUP", "Up Fractal Color", "", core.COLOR_UPCANDLE);
    indicator.parameters:addColor("clrDN", "", "Down Fractal Color", core.COLOR_DOWNCANDLE);
    indicator.parameters:addBoolean("ShowPrice", "Show Price", "", false);
    indicator.parameters:addColor("clrPrice","Label Color", "", core.rgb(128, 128, 128));
end

local source;
local up, down;
local SignalMode;
local Signal;
function Prepare(nameOnly)
    source = instance.source;
	SignalMode=instance.parameters.SignalMode;
    local name = profile:id() .. "(" .. source:name() .. ")";
    instance:name(name);
    if nameOnly then
        return;
    end
	
	if SignalMode then
	    Signal= instance:addStream("Signal", core.Bar, name, "Signal", instance.parameters.clrPrice, 6);
	else
	    Signal = instance:addInternalStream(0, 0);
	end
    up = instance:createTextOutput ("Up", "Up", "Wingdings", 9, core.H_Center, core.V_Top, instance.parameters.clrUP, 0);
    down = instance:createTextOutput ("Dn", "Dn", "Wingdings", 9, core.H_Center, core.V_Bottom, instance.parameters.clrDN, 0);
    up1 = instance:createTextOutput ("", "UpL", "Verdana", 7, core.H_Right, core.V_Top, instance.parameters.clrPrice, 0);
    down1 = instance:createTextOutput ("", "DnL", "Verdana", 7, core.H_Right, core.V_Bottom, instance.parameters.clrPrice, 0);
end

function Update(period, mode)
    if (period > 6) then
	
	Signal[period-2]=0;
	Signal:setColor(period-2, instance.parameters.clrPrice);
        local curr = source.high[period - 2];
        if (curr > source.high[period - 4] and curr > source.high[period - 3] and
            curr > source.high[period - 1] and curr > source.high[period]) then
            up:set(period - 2, source.high[period - 2], "\217", source.high[period - 2]);
            if instance.parameters.ShowPrice then
                up1:set(period - 2, source.high[period - 2], "  " .. source.high[period - 2]);
            end
			Signal[period-2]=1;
			Signal:setColor(period-2, instance.parameters.clrUP);
        else
            up:setNoData(period - 2);
            up1:setNoData(period - 2);			
        end
        curr = source.low[period - 2];
        if (curr < source.low[period - 4] and curr < source.low[period - 3] and
            curr < source.low[period - 1] and curr < source.low[period]) then
            down:set(period - 2, source.low[period - 2], "\218", source.low[period - 2]);
            if instance.parameters.ShowPrice then
                down1:set(period - 2, source.low[period - 2], "  " .. source.low[period - 2]);				
            end
			Signal:setColor(period-2, instance.parameters.clrDN);
			Signal[period-2]=-1;
        else
            down:setNoData(period - 2);
            down1:setNoData(period - 2);
        end
    end
end