Dark Cloud automatic finding script

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//  Copyright by HPotter v1.0 11/04/2014
//    This is a bearish reversal pattern formed by two candlesticks  within a uptrend. 
//    Consists of an up candlestick followed by a down candlestick which opens lower 
//    than the prior candlestick and closes below the midrange of the prior candlestick. 
//    It is the reverse of the Piercing Line.
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study(title = "Dark Cloud", overlay = true)
barcolor(open[1] < close[1] ? open > high[1] ? close < close[1] - ((close[1] - open[1]) / 2) ? close > open[1] ? yellow :na :na :na :na )