Learn AFL Code : Draw Bolinger Band in a Price chart

This very simple code will add a Bolinger Band in your price chart

_SECTION_BEGIN("BB price chart");
SetChartOptions(0,chartShowArrows|chartShowDates);
Plot( Close, "Close", ParamColor("Color", colorBlack ), styleNoTitle | ParamStyle("Style") | GetPriceStyle() );

P = ParamField("Price field",-1);
Periods = Param("Periods", 20, 2, 300, 1 );
Width = Param("Width", 2, 0, 10, 0.05 );
Color = ParamColor("Color", colorCycle );
Style = ParamStyle("Style");


Plot( BBandTop( P, Periods, Width ), "BBTop" + _PARAM_VALUES(), Color, Style );
Plot( BBandBot( P, Periods, Width ), "BBBot" + _PARAM_VALUES(), Color, Style );

_SECTION_END();

Debarghya Mukherjee
Mobile: (+91)-9038787021
Email: debarghya_mkr@yahoo.com