Only Buy Zone Vertical Columns - Amibroker AFL Code

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function Trix2( array, period )
{
tmp = DEMA(DEMA( DEMA( array, period ), period ), period );
result = (tmp - Ref( tmp , -1 ))/Ref( tmp, -1 ) ;
return result;
}
//(O+C)/2
Trixline = Trix2( (C), 5 );
TrixSignal = DEMA( Trixline, 3 );

Plot( Trixline, "TRIX(5)", colorRed ,4);
Plot( TrixSignal, "DMA(TRIX,3)", colorBlue ,4);

GoldenCross = Cross( TrixLine, TrixSignal );
TrixFall = Trixline < Ref( Trixline, -1 ) AND Ref( Trixline, -1 ) > Ref( Trixline, -2 );

Buy = GoldenCross;
Sell = TrixFall;
Plot( Flip( Buy, Sell ), "Trade", colorPaleGreen, styleArea | styleOwnScale, 0, 1 );
GraphXSpace=7;