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//+------------------------------------------------------------------+
//| Custom Indicator for Candle Power and Gap Detection               |
//+------------------------------------------------------------------+

#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 Green // Green Up Arrow
#property indicator_color2 Red   // Red Down Arrow

double CandlePowerBuffer[];
double ArrowBufferUp[];
double ArrowBufferDown[];

// Initialization function
int OnInit() {
   IndicatorShortName("Candle Power and Gap Indicator");
   
   // Buffers for storing candle power and arrows
   SetIndexBuffer(0, ArrowBufferUp);
   SetIndexBuffer(1, ArrowBufferDown);
   
   SetIndexArrow(0, 233); // Up Arrow symbol
   SetIndexArrow(1, 234); // Down Arrow symbol
   
   return(INIT_SUCCEEDED);
}

// Calculation function
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[]) {
   
   int start = prev_calculated > 0 ? prev_calculated - 1 : 0;

   for (int i = start; i < rates_total; i++) {
       // 1. Candle Power Calculation (High - Low)
       double candlePower = high[i] - low[i];
       
       // Display the candle power above/below each candle
       Comment("Candle Power: ", DoubleToString(candlePower, 2)); // Optional - Display on the chart

       // 2. Gap Up/Gap Down Arrows
       if (i > 0) {
           if (open[i] > close[i-1]) {
               ArrowBufferUp[i] = low[i] - 10 * Point;  // Place green arrow below the candle
               ArrowBufferDown[i] = EMPTY_VALUE;        // No down arrow
           } else if (open[i] < close[i-1]) {
               ArrowBufferDown[i] = high[i] + 10 * Point; // Place red arrow above the candle
               ArrowBufferUp[i] = EMPTY_VALUE;            // No up arrow
           } else {
               ArrowBufferUp[i] = EMPTY_VALUE;
               ArrowBufferDown[i] = EMPTY_VALUE;
           }
       }
   }
   
   return(rates_total);
}
//+------------------------------------------------------------------+