Buy Sell Indicator Line Chart - Amibroker AFL Code

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P = ParamField("Price field",-1);
PL = Param("Periods",20,4,45,1);

UpDay = Sum((P-Ref(P,-1))*(P>Ref(P,-1)),PL);
DownDay = Sum((Ref(P,-1)-P)*(P<Ref(P,-1)),PL);
Cmo = 100 * ((UpDay-DownDay)/(UpDay+DownDay));

/*Plot(CmO,"CMO("+PL+")", ParamColor( "Color", colorCycle ), ParamStyle("Style") );
Plot(EMA( CmO,9),"", colorLightBlue);
PlotGrid(50, colorLightGrey);
PlotGrid(0, colorLightGrey);
PlotGrid(-50, colorLightGrey);
*/

Buy1 = Cross(BarsSince(Cross(-50, CMO)),BarsSince(Cross(CMO, EMA( CMO, 9 )) ));
Sell1 = Cross(BarsSince( Cross( CMO, 50 ) ), BarsSince( Cross( EMA( CMO, 9), CMO ) ) );
Buy2 = (Cum(BarsSince( Cross( CMO, EMA( CMO, 9 ))))==0 AND BarsSince( Cross( -50, CMO ))>0);
Sell2 = (Cum(BarsSince( Cross(  EMA( CMO, 9),CMO)))==0 AND BarsSince( Cross( CMO, 50 ))>0);

PlotShapes( IIf(Buy1 OR Buy2, shapeSmallCircle,0) , colorLime,0,L,-10);
PlotShapes( IIf(Sell1 OR Sell2, shapeSmallCircle,0) , colorOrange,0,H,10);

Color = IIf((Cmo > 50), colorRed, IIf((Cmo < -50), colorGreen, IIf ((Cmo >= -50 AND Cmo <=50), colorLightBlue, 0))); 

SetChartOptions( 0, chartShowDates | chartShowArrows | chartLogarithmic | chartWrapTitle );
_N( Title = StrFormat( "{{NAME}} - " + SectorID( 1 ) + " - {{INTERVAL}} {{DATE}} Open %g, Hi %g, Lo %g, Close %g (%.1f%%) Vol " + WriteVal( V, 1.0 ) + " {{VALUES}}", O, H, L, C, SelectedValue( ROC( C, 1 ) ) ) );
Plot( C, "Close", color, styleBar | styleNoTitle | ParamStyle( "Style" ) | GetPriceStyle() );

if ( ParamToggle( "Tooltip shows", "All Values|Only Prices" ) )
{
    ToolTip = StrFormat( "Open: %g\nHigh:  %g\nLow:   %g\nClose:  %g (%.1f%%)\nVolume: " + NumToStr( V, 1 ), O, H, L, C, SelectedValue( ROC( C, 1 ) ) );
}