Candle color inconsistency bug

[Lucas Iervolino]

There's a bug in the indicator I made where most of the times I add the indicator to the graph, the candle colors displayed aren't correct.

The bug can be seen in the video below (the second time I add the indicator the colors are right):

https://streamable.com/9pvqf

Code:

#property indicator_buffers 7
#property indicator_plots 2

#property indicator_label1 "Candles"
#property indicator_color1 Green, Red
#property indicator_type1 DRAW_COLOR_CANDLES

#property indicator_label2 "MA"
#property indicator_color2 Green, Red, Yellow
#property indicator_type2 DRAW_COLOR_LINE
#property indicator_width2 2

double buffer_open[], buffer_high[], buffer_low[], buffer_close[];
double candle_color[];

int MA;
double buffer_ma[];
double ma_color[];

int OnInit() {
   SetIndexBuffer(0, buffer_open, INDICATOR_DATA);
   SetIndexBuffer(1, buffer_high, INDICATOR_DATA);
   SetIndexBuffer(2, buffer_low, INDICATOR_DATA);
   SetIndexBuffer(3, buffer_close, INDICATOR_DATA);
   SetIndexBuffer(4, candle_color, INDICATOR_COLOR_INDEX);
   
   SetIndexBuffer(5, buffer_ma, INDICATOR_DATA);
   SetIndexBuffer(6, ma_color, INDICATOR_COLOR_INDEX);
   
   MA = iMA(_Symbol, _Period, 20, 0, MODE_SMA, PRICE_CLOSE);

   return(0);
}

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;
   if (prev_calculated == 0) {
      start = 1;
   } else {
      start = prev_calculated - 1;
   }
   
   CopyBuffer(MA, 0, 0, rates_total, buffer_ma);
   
   for (int i = start; i < rates_total; i++) {
      if (buffer_ma[i] > buffer_ma[i - 1]) {
         ma_color[i] = 0;
      } else if (buffer_ma[i] < buffer_ma[i - 1]) {
         ma_color[i] = 1;
      } else {
         ma_color[i] = 2;
      }
   
      buffer_open[i] = open[i];
      buffer_high[i] = high[i];
      buffer_low[i] = low[i];
      buffer_close[i] = close[i];
      
      if (close[i] > close[i - 1] && buffer_ma[i] > buffer_ma[i - 1]) {
         candle_color[i] = 0;
      } else if (close[i] < close[i - 1] && buffer_ma[i] < buffer_ma[i - 1]) {
         candle_color[i] = 1;
      }
   }             
   
   return(rates_total);
}

[William Roeder]

Iervolino: the candle colors displayed aren't correct

      if (close[i] > close[i - 1] && buffer_ma[i] > buffer_ma[i - 1]) {
         candle_color[i] = 0;
      } else if (close[i] < close[i - 1] && buffer_ma[i] < buffer_ma[i - 1]) {
         candle_color[i] = 1;
      }
      else                            What color do you set here?

// Your code (above) code rewritten for clarity (below:)

      if (buffer_ma[i] > buffer_ma[i - 1]) {
         if (close[i] > close[i - 1]) candle_color[i] = 0;
         else                         What color do you set here?
      } else {
         if (close[i] < close[i - 1]) candle_color[i] = 1;
         else                         what color do you set here?
      }

[Lucas Iervolino]

whroeder1:

Thank you!

Is it correct now?

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;
   if (prev_calculated == 0) {
      start = 1;
   } else {
      start = prev_calculated - 1;
   }
   
   CopyBuffer(MA, 0, 0, rates_total, buffer_ma);
   
   for (int i = start; i < rates_total; i++) {
      buffer_open[i] = open[i];
      buffer_high[i] = high[i];
      buffer_low[i] = low[i];
      buffer_close[i] = close[i];   
   
      if (buffer_ma[i] > buffer_ma[i - 1]) {
         ma_color[i] = 0;
         if (close[i] > close[i - 1])
            candle_color[i] = 0;
         else
            candle_color[i] = EMPTY_VALUE;
      } else if (buffer_ma[i] < buffer_ma[i - 1]) {
         ma_color[i] = 1;
         if (close[i] < close[i - 1])
            candle_color[i] = 1;
         else
            candle_color[i] = EMPTY_VALUE;
      } else {
         ma_color[i] = 2;
         candle_color[i] = EMPTY_VALUE;
      }     
   }             
   
   return(rates_total);
}