Metatrader 5 Indicator | Discover: Target Trend v3 Indicator | Expert Advisor Code 📈 MT4 & MT5 Downloads

New free code from MQL5: indicators, EAs, and scripts for traders.

#property 
#property version   "1.02"
#property indicator_chart_window


#property indicator_buffers 6
#property indicator_plots   3

//--- Buy Arrow (Filled)
#property indicator_label1  "Buy Signal"
#property indicator_type1   DRAW_ARROW
#property indicator_color1  C'6,182,144'
#property indicator_width1  4

//--- Sell Arrow (Filled)
#property indicator_label2  "Sell Signal"
#property indicator_type2   DRAW_ARROW
#property indicator_color2  C'182,112,6'
#property indicator_width2  4

//--- Trend Trailing Stop Line (Color Line)
#property indicator_label3  "Trend Line"
#property indicator_type3   DRAW_COLOR_LINE
// Define the two colors for the line: Index 0 = Bullish, Index 1 = Bearish
#property indicator_color3  C'6,182,144', C'182,112,6' 
#property indicator_style3  STYLE_SOLID
#property indicator_width3  2

//+------------------------------------------------------------------+
//| Input Parameters                                                 |
//+------------------------------------------------------------------+
input int InpLength    = 10; 
input int InpLookback  = 4;  

//+------------------------------------------------------------------+
//| Indicator Buffers                                                |
//+------------------------------------------------------------------+
double BuyBuffer[];
double SellBuffer[];
double TrendBuffer[];
double TrendColorBuffer[]; // Buffer for the line colors
double TrendState[];       
double AtrSmaBuffer[];     

int g_atr_handle, g_sma_high_handle, g_sma_low_handle;

//+------------------------------------------------------------------+
int OnInit()
{
   SetIndexBuffer(0, BuyBuffer,        INDICATOR_DATA);
   SetIndexBuffer(1, SellBuffer,       INDICATOR_DATA);
   SetIndexBuffer(2, TrendBuffer,      INDICATOR_DATA);
   SetIndexBuffer(3, TrendColorBuffer, INDICATOR_COLOR_INDEX); // Links to Plot 3
   SetIndexBuffer(4, TrendState,       INDICATOR_CALCULATIONS);
   SetIndexBuffer(5, AtrSmaBuffer,     INDICATOR_CALCULATIONS);

   // Codes 233 and 234 are filled Wingdings arrows
   PlotIndexSetInteger(0, PLOT_ARROW, 233); 
   PlotIndexSetInteger(1, PLOT_ARROW, 234);

   PlotIndexSetDouble(0, PLOT_EMPTY_VALUE, 0.0);
   PlotIndexSetDouble(1, PLOT_EMPTY_VALUE, 0.0);
   PlotIndexSetDouble(2, PLOT_EMPTY_VALUE, 0.0);

   g_atr_handle      = iATR(_Symbol, _Period, 200);
   g_sma_high_handle = iMA(_Symbol, _Period, InpLength, 0, MODE_SMA, PRICE_HIGH);
   g_sma_low_handle  = iMA(_Symbol, _Period, InpLength, 0, MODE_SMA, PRICE_LOW);

   return INIT_SUCCEEDED;
}

//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,
                const int prev_calculated,
                const datetime &time[],
                const double   &open[],
                const double   &high[],
                const double   &low[],
                const double   &close[],
                const long     &tick_volume[],
                const long     &volume[],
                const int      &spread[])
{
   const int ATR_PERIOD     = 200;
   const int ATR_SMA_PERIOD = 200;
   const int MIN_BARS       = ATR_PERIOD + ATR_SMA_PERIOD + InpLength + 2;

   if(rates_total < MIN_BARS) return 0;

   if(BarsCalculated(g_atr_handle) < rates_total ||
      BarsCalculated(g_sma_high_handle) < rates_total ||
      BarsCalculated(g_sma_low_handle) < rates_total)
      return prev_calculated;

   double atr_vals[], sma_h[], sma_l[];
   if(CopyBuffer(g_atr_handle, 0, 0, rates_total, atr_vals) != rates_total ||
      CopyBuffer(g_sma_high_handle, 0, 0, rates_total, sma_h) != rates_total ||
      CopyBuffer(g_sma_low_handle, 0, 0, rates_total, sma_l) != rates_total)
      return prev_calculated;

   int compute_start;
   if(prev_calculated <= 0) {
      compute_start = MIN_BARS - 2;
      TrendState[compute_start] = 0.0;
   } else {
      compute_start = MathMax(MIN_BARS - 2, prev_calculated - 1 - InpLookback);
   }

   // Pass 1: ATR SMA
   for(int i = compute_start; i < rates_total; i++) {
      double sum = 0.0;
      for(int k = 0; k < ATR_SMA_PERIOD; k++) sum += atr_vals[i - k];
      AtrSmaBuffer[i] = (sum / ATR_SMA_PERIOD) * 0.8;
   }

   // Pass 2: Trend and Colors
   for(int i = compute_start + 1; i < rates_total; i++) {
      double atr_cur  = AtrSmaBuffer[i];
      double sma_high_cur  = sma_h[i] + atr_cur;
      double sma_low_cur   = sma_l[i] - atr_cur;
      
      double sma_high_prev = sma_h[i - 1] + AtrSmaBuffer[i-1];
      double sma_low_prev  = sma_l[i - 1] - AtrSmaBuffer[i-1];

      bool crossover  = (close[i] > sma_high_cur) && (close[i - 1] <= sma_high_prev);
      bool crossunder = (close[i] < sma_low_cur)  && (close[i - 1] >= sma_low_prev);

      double prev_trend = TrendState[i - 1];
      double cur_trend  = prev_trend;

      if(crossover)  cur_trend =  1.0;
      if(crossunder) cur_trend = -1.0;

      TrendState[i] = cur_trend;

      if(cur_trend == 1.0) {
         TrendBuffer[i] = sma_low_cur;
         TrendColorBuffer[i] = 0.0; // Bullish Color (Index 0)
      } else if(cur_trend == -1.0) {
         TrendBuffer[i] = sma_high_cur;
         TrendColorBuffer[i] = 1.0; // Bearish Color (Index 1)
      } else {
         TrendBuffer[i] = 0.0;
         TrendColorBuffer[i] = EMPTY_VALUE;
      }

      BuyBuffer[i]  = 0.0;
      SellBuffer[i] = 0.0;

      if(cur_trend == 1.0 && prev_trend != 1.0)
         BuyBuffer[i] = low[i] - atr_cur * 2.0;

      if(cur_trend == -1.0 && prev_trend != -1.0)
         SellBuffer[i] = high[i] + atr_cur * 2.0;
   }

   return rates_total;
}