Colorful Bollinger Band OB OS Zone - Amibroker AFL Code

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_SECTION_BEGIN("Colorf Bollinger Bands");
P = ParamField("Price field",-1);
Period = Param("Short Periods", 20, 15, 30, 1 );
Width = Param("Short Width", 2, 1, 10, 1 );

TopCond=BBandTop( P, Period, Width )>Ref(BBandTop( P, Period, Width ),-1);
MidCond=MA(C,Period)>Ref(MA(C,Period),-1);
BotCond=BBandBot( P, Period, Width )>Ref(BBandBot( P, Period, Width ),-1);


UpColor=IIf(TopCond AND MidCond,colorDarkBlue,colorDarkRed);
DownColor=IIf(MidCond AND BotCond,colorDarkBlue,colorDarkRed);

PlotOHLC(BBandTop( P, Period, Width ),BBandTop( P,Period, Width ),MA(C,Period),MA(C,Period), "", UpColor, styleCloud+styleNoLabel+styleNoTitle, Null, Null, Null, -2 );
PlotOHLC(MA(C,Period),MA(C,Period),BBandBot( P, Period, Width ),BBandBot( P, Period, Width ), "", DownColor, styleCloud+styleNoLabel+styleNoTitle, Null, Null, Null, -2 );

Plot(BBandBot( P, Period, Width ),"",colorLime,styleThick+styleNoTitle, Null, Null, Null, -1);
Plot(BBandTop( P, Period, Width ),"",colorLime,styleThick+styleNoTitle, Null, Null, Null, -1);
Plot(MA(C,Period),"",colorLime,styleThick+styleNoTitle, Null, Null, Null, -1);

Title=Name();


Filter=TopCond AND MidCond AND BotCond;
AddColumn(V,"volume",1.0);

_SECTION_END();

_SECTION_BEGIN("Price");
SetChartOptions(0,chartShowArrows|chartShowDates);
_N(Title = StrFormat("{{NAME}} - {{INTERVAL}} {{DATE}} Open %g, Hi %g, Lo %g, Close %g (%.1f%%) {{VALUES}}", O, H, L, C, SelectedValue( ROC( C, 1 ) ) ));
Plot( C, "Close", ParamColor("Color", colorBrightGreen ), styleNoTitle | ParamStyle("Style") | GetPriceStyle() ); 
_SECTION_END();