[amibroker] Bollinger bands color change - expand - narrowing afl

["tummalaajaybabu" <tummalaajaybabu@xxxxxxxxx>]

Hi all 

Bollinger bands color change - generally the bands are in one color.
But i'm trying to write afl for the bands is - Assume Default color is
red. When the uptrend is born the upper band turns up in that case -
what happend in default color is the same red color is appearing when
the trend is at an end the band turns down again the same red color is
continue.

I wish to change to the colors - when the upper band turns up the red
color is changed to green (or any) for quick visual interpretation the
trend is beginning. When the trend is at an end the bands change color
from green to red. like that bottom band also. 

_SECTION_BEGIN("Bollinger Bands");
P = ParamField("Price field",-1);
Periods = Param("Periods", 20, 2, 100, 1 );
Width = Param("Width", 2, 0, 10, 0.05 );
Color = ParamColor("Color", colorCycle );
Style = ParamStyle("Style");
color = IIf( BBandTop (P)> Ref (BBandTop(P), -1), colorCustom12,
colorRed );
/*color = IIf( BBandBot(p) < Ref (BBandBot(P), -1), colorGreen,
colorRed );*/
Plot( BBandTop( P, Periods, Width ), "BBTop" + _PARAM_VALUES(), Color,
styleThick ); 
Plot( BBandBot( P, Periods, Width ), "BBBot" + _PARAM_VALUES(), Color,
styleThick ); 

This is the formula i have tried. But i'm facing one problem. When the
upper band turns up the color is chaning. At the same time the lower
band also turning up but the color is not changing (if the color
changed abruptly it will appearing in red color at an uptrend in the
middle of the line again it will change to green in the middle). So, i
have put (/*) mark in bbandbot syntax line. But no change. I have mark
the syntax line with (/*) but the the bottom band is also color
changing? I write color condition to bband top only but i'm getting
the same colors at bottom band too?

Can any one look into the afl and suggest me what to do?

Thank you....

Ajay



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