///////////////////////////////////////////////////////////////////////////
//Amibroker .afl equivalent for Metastock PREV function.
///////////////////////////////////////////////////////////////////////////

SetBarsRequired( 100000, 0 );

ATRMulti = Param("ATRmulti",1.7,1,20,0.1,0) ;
ATRPeriod = Param("ATRper",10,1,50,1,0) ;

//AvPrc = (High + Low + Close) / 3;
AvPrc = (High + Low + 2*Close) / 4;
calc = AvPrc - ATR(ATRPeriod ) * ATRMulti;

result = calc;

previous = Null;

for( i = 1; i < BarCount; i++ )
{
  if( Close[ i - 1 ] >= previous AND calc[ i ] <= previous )
    result[ i ] = previous;

  previous = result[ i ];
}

Plot( result, "\nresult", colorRed,styleLine+styleThick );

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//HEIKIN-ASHI ORIGINAL

//SetChartOptions(0,chartShowArrows | chartShowDates);
HaClose = (O + H + L + C)/4; 
HaOpen = AMA( Ref( HaClose, -1 ), 0.5 ); 
HaHigh = Max( H, Max( HaClose, HaOpen ) ); 
HaLow = Min( L, Min( HaClose, HaOpen ) ); 
xDiff = (HaHigh - Halow) * 10000;
//barcolor = IIf(HaClose >= HaOpen,colorGreen,colorRed);
//barcolor= IIf(HaClose>=HaOpen AND C>Ref(C,-1) AND C>=O,colorGreen,
//          IIf(HaClose<HaOpen AND C<Ref(C,-1) AND C<O, colorRed, colorBrown)) ;
//SetBarFillColor(IIf(HaClose>=HaOpen,colorBrightGreen,colorOrange));
//SetBarFillColor(IIf(HaClose>=HaOpen AND C>Ref(C,-1) AND C>=O,colorBrightGreen,
//                IIf(HaClose<HaOpen AND C<Ref(C,-1) AND C<O, colorOrange, colorTan)) );
//PlotOHLC( HaOpen, HaHigh, HaLow, HaClose, "\nHeikin-ashi", barcolor, styleCandle );
//PlotOHLC( HaOpen, HaHigh, HaLow, HaClose, "\nHeikin-ashi", colorBlack, styleCandle );

//HaDelta & MA

HaDelta= HaClose-HaOpen ;
MAhadelta= MA(Hadelta,3) ;
Hadeltaup3= Hadelta>MA(Hadelta,3) ;
Hadeltaup33 = Hadelta>MA(MA(Hadelta,3),3) ;
//Plot(Hadelta,"haDelta",colorBlack) ;
//Plot(0,"",colorBrown) ;
//Plot( MA1, "MA1", colorRed );
//Plot( MA2, "MA2", colorBlue );

Haup= HaClose>=HaOpen ;
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//TRENDING RIBBON

// Paste the code below to your price chart somewhere and green ribbon means both
// both MACD and ADX trending up so if the red ribbon shows up the MACD and the ADX 
// are both trending down.
_SECTION_BEGIN("trending ribbon");
uptrend= (PDI()>MDI() AND MACD()>Signal()) ;
downtrend=MDI()>PDI() AND Signal()>MACD();
Plot( 2, /* defines the height of the ribbon in percent of pane width */"",
    IIf(uptrend,colorLime,IIf(downtrend,colorRed,colorTan)),styleOwnScale|styleArea|styleNoLabel,-0.5,100 );
_SECTION_END();
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//MODEL PENTRU 3 CULORI , ADICA 3 CONDITII

//bar3culori= IIf(C> NLBL, colorBlue, IIf(C<NLSL, colorRed, colorTan));//MODEL MODEL MODEL 3 CULORI
//SetBarFillColor(IIf(HaClose>=HaOpen,colorBrightGreen,colorOrange));

//bar3culori= IIf(C> NLBL, colorBlue, IIf(C<NLSL, colorRed, colorTan));//MODEL MODEL MODEL 3 CULORI
//SetBarFillColor(IIf(HaClose>=HaOpen AND C>Ref(C,-1),colorBrightGreen,IIf(HaClose<HaOpen AND C<Ref(C,-1), colorRed, colorTan)) );
//SetBarFillColor= IIf(C> NLBL, colorBlue, IIf(C<NLSL, colorRed, colorTan));//MODEL MODEL MODEL 3 CULORI
//xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

//PRICE

_SECTION_BEGIN("Price");
//SetChartOptions(0,chartShowArrows|chartShowDates);
_N(Title = StrFormat("{{NAME}} - {{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 )) ));
barcolor= IIf(C>O AND C>Ref(C,-1) AND HaClose>=HaOpen,colorBlue,
          IIf(C<O AND C<Ref(C,-1) AND HaClose<HaOpen,colorRed,colorTan)) ;
//Plot( C, "", ParamColor("Color", colorBlack ), styleNoTitle | ParamStyle("Style") | GetPriceStyle() ); 
Plot( C, "", barcolor,styleBar+styleThick ); 
_SECTION_END();
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//FORMULE

stochup= StochK()>StochD() ;
stoch80= StochK()<80 ;
MACDup= MACD()>Signal() ;
Hist= MACD()-Signal() ;
Histup= Hist>Ref(Hist,-1) ;
MFIupema5= MFI()>EMA(MFI(),5) ;
MFI30= MFI()>30 ;
Cupo= C>O ;
MA10up= MA(C,10)>=Ref(MA(C,10),-1) ;
MA20up= MA(C,20)>=Ref(MA(C,20),-1) ;
EMA50up= EMA(C,50)>=Ref(EMA(C,50),-1) ;
CupEMA50= C>EMA(C,50) ;
Cupma20= C>MA(C,20) ;
PDIupmdi= PDI()>MDI() ;
CCIup0= CCI()>0 ;
top2up= BBandTop(C,20,2)>=Ref(BBandTop(C,20,2),-1) ;
top1up= BBandTop(C,20,1)>=Ref(BBandTop(C,20,1),-1) ;
Cuptop1= C>BBandTop(C,20,1) ;
haup= HaClose>=HaOpen ;
Lim= (ADX()<50 AND MFI()>30) ;
mybuy= C>result ;
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//PARAMTOGGLE

// This combines indicators into one timing Signal
//function ParamOptimize( description, default, minv, maxv, step )
//    { return Optimize(description, Param(description,default, minv, maxv, step ), minv, maxv, step ); }
tgl = ParamToggle("Result", "AND logic|Compare");
// switch test calculation and compare the results
if(tgl)
{
myBuy = mybuy AND macdup AND histup AND cupo AND haup ;
myShort = !mybuy ; 
}
else
{
myBuy   = IIf( C>result AND MACD()>Signal() AND Hist>Ref(Hist,-1) AND C>O AND HaClose>=HaOpen     ,1,0);
myShort = IIf( C<result      ,1,0);
}

Buy = ExRem(myBuy, myShort);
Sell = ExRem(myShort, myBuy);

PlotShapes(IIf(Buy,shapeUpArrow,shapeNone),colorBlue,0,Low,Offset=-15);
PlotShapes(IIf(Sell,shapeDownArrow,shapeNone),colorRed,0,High,Offset=-15);