Volatility system for Amibroker (AFL)

_SECTION_BEGIN("VOLATILITY SYSTEM");
EntrySignal = C > ( LLV( L, 20 ) + 2 * ATR( 10 ) ); 
ExitSignal = C < ( HHV( H, 20 ) - 2 * ATR( 10 ) ); 
Color = IIf( EntrySignal, colorBlue, IIf( ExitSignal, colorOrange, colorGrey50 )); 
TrailStop = HHV( C - 2 * ATR(10), 15 ); 
ProfitTaker = EMA( H, 13 ) + 2 * ATR(10); 
/* plot price chart and stops */ 
Plot( TrailStop, "Trailing stop", colorBrown, styleThick | styleLine ); 
Plot( ProfitTaker, "Profit taker", colorLime, styleThick ); 
Plot( C, "Price", Color, styleBar | styleThick ); 

/* plot color ribbon */ 
Plot( 1, "", Color, styleArea | styleOwnScale | styleNoLabel, -0.1, 50 ); 

_SECTION_END();