// Downloaded From https://www.WiseStockTrader.com
_N(Title = StrFormat("{{NAME}} - {{INTERVAL}} {{DATE}} Open %g, Hi %g, Lo %g, Close %g (%.1f%%) {{VALUES}}", O, H, L, C, SelectedValue( ROC( C, 1 ) ) ));

Factor=Param("Factor",4,1,10,1);//4
Pd=Param("ATR Periods",6,1,100,1);//6
Up=(H+L)/2+(Factor*ATR(Pd));
Dn=(H+L)/2-(Factor*ATR(Pd));
iATR=ATR(Pd);
TrendUp=TrendDown=Null;
trend[0]=1;
changeOfTrend=0;
flag=flagh=0;

for (i = 1; i <BarCount-1; i++) {
      TrendUp[i] = Null;
      TrendDown[i] = Null;
    
      trend[i]=1;
  
      
      if (Close[i]>Up[i-1]) {
        trend[i]=1;
        if (trend[i-1] == -1) changeOfTrend = 1;
        
      }
      else if (Close[i]<Dn[i-1]) {
        trend[i]=-1;
        if (trend[i-1] == 1) changeOfTrend = 1;
      }
      else if (trend[i-1]==1) {
        trend[i]=1;
        changeOfTrend = 0;      
      }
      else if (trend[i-1]==-1) {
        trend[i]=-1;
        changeOfTrend = 0;
      }

      if (trend[i]<0 && trend[i-1]>0) {
        flag=1;
      }
      else {
        flag=0;
      }
      
      if (trend[i]>0 && trend[i-1]<0) {
        flagh=1;
      }
      else {
        flagh=0;
      }
      
      if (trend[i]>0 && Dn[i]<Dn[i-1]){
        Dn[i]=Dn[i-1];
      }
      
      if (trend[i]<0 && Up[i]>Up[i-1])
        { Up[i]=Up[i-1];
      }
      
      if (flag==1)
      {  Up[i]=(H[i]+L[i])/2+(Factor*iATR[i]);;
        } 
      if (flagh==1)
        { Dn[i]=(H[i]+L[i])/2-(Factor*iATR[i]);;
        }
      if (trend[i]==1) {
        TrendUp[i]=Dn[i];
        if (changeOfTrend == 1) {
            TrendUp[i-1] = TrendDown[i-1];
            changeOfTrend = 0;
        }
      }
      else if (trend[i]==-1) {
        TrendDown[i]=Up[i];
        if (changeOfTrend == 1) {
            TrendDown[i-1] = TrendUp[i-1];
            changeOfTrend = 0;
        }
      }
  } 

Plot(TrendUp,"Trend",colorGreen);
Plot(TrendDown,"Down",colorRed);