【包络线指标(Mov Avg Envelopes)】
[code]inputs:
PriceH( Close ),
PriceL( Close ),
Length( 20 ),
PctAbove( 1 ),
PctBelow( 1 ),
Displace( 0 ) ;
variables:
var0( 0 ),
var1( 0 ),
var2( 1 - ( PctBelow * .01 ) ) ,
var3( 1 + ( PctAbove * .01 ) ) ;
var0 = AverageFC( PriceL, Length ) * var2 ;
var1 = AverageFC( PriceH, Length ) * var3 ;
condition1 = Displace >= 0 or CurrentBar > AbsValue( Displace ) ;
if condition1 then
begin
Plot1[Displace]( var1, "UpperBand" ) ;
Plot2[Displace]( var0, "LowerBand" ) ;
if Displace <= 0 then
begin
condition1 = PriceL crosses over var0 ;
if condition1 then
Alert( "Price crossing over lower price band" )
else
begin
condition1 = PriceH crosses under var1 ;
if condition1 then
Alert( "Price crossing under upper price band" ) ;
end ;
end;
end ;
[/code]
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