-- Id: 7337
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=23133

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-- The CLEAR method is described in the Stock & Commodities Sep 2010 issue
-- in Ron Black articles "Getting Clear With Short-Term Swings"
function Init()
    indicator:name("Clear Method Bar");
    indicator:description("The indicator detects market direction changes using Ron Black's 'Getting Clear With Short-Term Swings' described in Sep 2010 issue of Stock & Commodities");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Indicator);

    indicator.parameters:addGroup("Style");
    indicator.parameters:addColor("Up", "Up Swing Line Color", "", core.rgb(0, 255, 255));
    indicator.parameters:addColor("Dn", "Down Swing Line Color", "", core.rgb(255, 0, 255)); 

end

local source;
local hh, hl, lh, ll, swing; -- internal data
 
local high, low, close, open;
function Prepare(nameOnly)
    local name;

    source = instance.source;
    first = source:first();

    name = profile:id() .. "(" .. source:name() .. ")";
    instance:name(name);
    if nameOnly then
        return;
    end

    hh = instance:addInternalStream(0, 0);
    ll = instance:addInternalStream(0, 0);
    lh = instance:addInternalStream(0, 0);
    hl = instance:addInternalStream(0, 0);
    swing = instance:addInternalStream(0, 0);
	
	open = instance:addStream("open", core.Line, name, "open", core.rgb(0, 0, 0), first)
    high = instance:addStream("high", core.Line, name, "high", core.rgb(0, 0, 0), first)
    low = instance:addStream("low", core.Line, name, "low", core.rgb(0, 0, 0), first)
    close = instance:addStream("close", core.Line, name, "close", core.rgb(0, 0, 0), first)
    instance:createCandleGroup("ZONE", "", open, high, low, close);

   
 
end

function Update(period, mode)

     high[period]= source.high[period];
	low[period]= source.low[period];		   
	close[period] = source.close[period];
	open[period]  = source.open[period];

    if period < first then
        swing[period] = 0;
    elseif period == first then
        swing[period] = 0;
        hh[period] = source.high[period];
        lh[period] = source.high[period];
        hl[period] = source.low[period];
        ll[period] = source.low[period];
    elseif period > first then
        swing[period] = swing[period - 1];
        hh[period] = math.max(source.high[period], hh[period - 1]);
        lh[period] = math.min(source.high[period], lh[period - 1]);
        hl[period] = math.max(source.low[period], hl[period - 1]);
        ll[period] = math.min(source.low[period], ll[period - 1]);
    end

    if swing[period] > 0 then
        if source.high[period] < hl[period] then
            swing[period] = -1;      -- up swing
            ll[period] = source.low[period];
            lh[period] = source.high[period];
        end
    elseif swing[period] < 0 then
        if source.low[period] > lh[period] then
            swing[period] = 1;     -- down swing
            hh[period] = source.high[period];
            hl[period] = source.low[period];
        end
    else
        -- look for initial
        if source.high[period] < hl[period] then
            swing[period] = -1;      -- up swing
            ll[period] = source.low[period];
            lh[period] = source.high[period];
        elseif source.low[period] > hl[period] then
            swing[period] = 1;     -- down swing
            hh[period] = source.high[period];
            hl[period] = source.low[period];
        end
    end

    if swing[period] > 0 then
        
        open:setColor(period, instance.parameters.Up); 		
    elseif swing[period] < 0 then
       
	   open:setColor(period, instance.parameters.Dn);
       
    end
end