Line Chart Green Red Dot Trading System - Amibroker AFL Code

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_SECTION_BEGIN("Trend Bars");
x = MA(C,4); //4-day MA
y = MA(C,9); //9-day MA
z = MA(C,18); // 18-day MA

sideways = IIf(y > z AND x < y,1,0); 
sideways1 = IIf(y < z AND x > y,1,0);
upt = IIf(x > y AND y > z,1,0);
dnt = IIf(x < y AND y < z,1,0);

Color = IIf(sideways OR sideways1, colorLightBlue, IIf(upt, colorLime, IIf(dnt, colorRed,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 ) ) );
}
_SECTION_END();

_SECTION_BEGIN("Elders Impulse");
macShort = Param("MACD Short MA",12,1,100,1);
macLong = Param("MACD Long MA",26,1,100,1);
macSmooth = Param("MACD Smoothing Period",9,1,100,1);
EMAp = Param("Short EMA",13,1,40,1);
macTime = Param("Time Ratio",1,22,1);
macShort = macShort*macTime;
macLong = macLong*macTime;
macSmooth = macSmooth*macTime;
EMAvg = EMAp*MacTime;
//{ do long impulse next }
mac = EMA(C,macShort)-EMA(C,macLong);
MacSig = EMA(mac,macSmooth);
macplot = (mac-MacSig);
impulse = IIf(macplot >= Ref(macplot,-macTime), 1,0)+IIf(Close > EMA(Close,EMAp),1,0)-1;

//Plot(impulse, "", colorRed);
//PlotGrid(0, colorLightGrey);

a = IIf(impulse>0,1,0);  //{ Buy OK}
b = IIf(impulse<0,1,0);  //{ Sell OK}
state=IIf(BarsSince(a)<BarsSince(b),1,0);

Longs=state==1;
shorts=state==0;


Buy = state>Ref(state,-1);
Sell = state<Ref(state,-1);

PlotShapes( IIf(Buy, shapeSmallCircle,0) , colorLime,0,L,-10);
PlotShapes( IIf(Sell, shapeSmallCircle,0) , colorOrange,0,H,10);
_SECTION_END();