Discussing the article: "From Basic to Intermediate: Indicator (III)"

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Check out the new article: From Basic to Intermediate: Indicator (III).

In this article, we will explore how to declare various graphical representation indicators, such as DRAW_COLOR_LINE and DRAW_FILLING. Additionally, of course, we will learn how to plot graphs using multiple indicators in a simple, practical, and fast way. This can truly change your perspective on MetaTrader 5 and the market as a whole.

In the previous article "From Beginner to Intermediate: Indicator (II)," we learned a great deal, as it demonstrated how to implement a moving average in a very simple, practical, and fully functional way. However, what was shown can be considered only a brief introduction to the world of MQL5 programming, since the material is quite basic, simple, and straightforward. But we can do much more.

So, make an effort to understand the concepts presented here. Don't just copy the code, and don't think that if you can't do it, no one else can either. Understanding the concept is more important than understanding the code itself, as the code can vary depending on who writes it, while the concept remains constant. We will start with something very simple, because what you will see can become very complex if we suddenly apply certain functionalities.


Author: CODE X

 
Dear all.
I am trying to build Custom indicator base on iBand.
After alot of searching I decide to Post here may be someone can help me.
Here is the full indicator. 
//This is MQL5\Indicators\Anhnt\iBand_Display.mq5
#property indicator_chart_window
#property indicator_buffers 3
#property indicator_plots   3

//--- plot Middle
#property indicator_label1  "Middle"
#property indicator_type1   DRAW_LINE

//--- plot Upper
#property indicator_label2  "Upper"
#property indicator_type2   DRAW_LINE

//--- plot Lower
#property indicator_label3  "Lower"
#property indicator_type3   DRAW_LINE

//==================================================
// Input parameters
//==================================================
input int      InpBBPeriod      = 14;
input ENUM_APPLIED_PRICE inp_Applied_Price   = PRICE_MEDIAN;
input double   InpBBDeviation   = 2.0;
input int      InpBBShift       = 0;

input color    InpMiddleColor   = clrYellow;
input color    InpUpperColor    = clrYellow;
input color    InpLowerColor    = clrYellow;

input int      InpMiddleWidth   = 2;
input int      InpUpperWidth    = 2;
input int      InpLowerWidth    = 2;

input bool inp_BB_Show_Upper   = true;
input bool inp_BB_Show_Middle  = true;
input bool inp_BB_Show_Lower   = true;

input ENUM_LINE_STYLE InpMiddleStyle = STYLE_DOT;
input ENUM_LINE_STYLE InpUpperStyle  = STYLE_DOT;
input ENUM_LINE_STYLE InpLowerStyle  = STYLE_DOT;
//==================================================
#include <Anhnt/Configuration/NamingConfiguration.mqh>
//==================================================
// Indicator buffers
//==================================================
double MiddleBuffer[];
double UpperBuffer[];
double LowerBuffer[];

//==================================================
// Global variables
//==================================================
int g_bb_handle = INVALID_HANDLE;

//https://www.mql5.com/en/docs/indicators/ibands
//--- we will keep the number of values in the Bollinger Bands indicator

//+------------------------------------------------------------------+
int OnInit()
{
   //==================================================
   // Set buffers
   //==================================================
   SetIndexBuffer(BASE_LINE,  MiddleBuffer, INDICATOR_DATA);
   SetIndexBuffer(UPPER_BAND, UpperBuffer,  INDICATOR_DATA);
   SetIndexBuffer(LOWER_BAND, LowerBuffer,  INDICATOR_DATA);

   ArraySetAsSeries(MiddleBuffer, true);
   ArraySetAsSeries(UpperBuffer,  true);
   ArraySetAsSeries(LowerBuffer,  true);   

   //==================================================   
   // Apply INPUT values to plots (runtime-safe way)
   //==================================================
   PlotIndexSetInteger(BASE_LINE,  PLOT_LINE_COLOR, InpMiddleColor);
   PlotIndexSetInteger(UPPER_BAND, PLOT_LINE_COLOR, InpUpperColor);
   PlotIndexSetInteger(LOWER_BAND, PLOT_LINE_COLOR, InpLowerColor);

   PlotIndexSetInteger(BASE_LINE,  PLOT_LINE_STYLE, InpMiddleStyle);
   PlotIndexSetInteger(UPPER_BAND, PLOT_LINE_STYLE, InpUpperStyle);
   PlotIndexSetInteger(LOWER_BAND, PLOT_LINE_STYLE, InpLowerStyle);

   PlotIndexSetInteger(BASE_LINE,  PLOT_LINE_WIDTH, InpMiddleWidth);
   PlotIndexSetInteger(UPPER_BAND, PLOT_LINE_WIDTH, InpUpperWidth);
   PlotIndexSetInteger(LOWER_BAND, PLOT_LINE_WIDTH, InpLowerWidth);   

   PlotIndexSetInteger(
         BASE_LINE,
         PLOT_DRAW_TYPE,
         inp_BB_Show_Middle ? DRAW_LINE : DRAW_NONE
   );

   PlotIndexSetInteger(
         UPPER_BAND,
         PLOT_DRAW_TYPE,
         inp_BB_Show_Upper ? DRAW_LINE : DRAW_NONE
   );

   PlotIndexSetInteger(
         LOWER_BAND,
         PLOT_DRAW_TYPE,
         inp_BB_Show_Lower ? DRAW_LINE : DRAW_NONE
   );
   string name = SMT_PREFIX + SMT_BB_NAME +
                 "(" + (string)InpBBPeriod + "," +
                 DoubleToString(InpBBDeviation, 1) + ")";  
   
                                   
   IndicatorSetString(INDICATOR_SHORTNAME, name);
   //==================================================
   // Create iBands handle
   //==================================================
   g_bb_handle = iBands(
      _Symbol,
      _Period,
      InpBBPeriod,
      InpBBShift,
      InpBBDeviation,
      inp_Applied_Price
   );
   if(g_bb_handle == INVALID_HANDLE)
   {
      Print("iBand_Display INIT FAILED. Unable to create iBands handle. GetLastError = ", GetLastError());
      return INIT_FAILED;
   }
      
   Print("iBand_Display INIT SUCCESS");
   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[]
)
{
   //https://www.mql5.com/en/docs/indicators/ibands&amp;nbsp;  
   //--- wait until iBands is ready
   int calculated = BarsCalculated(g_bb_handle);
   if(calculated <= InpBBPeriod)
      return 0;   
      // Print("DEBUG from OnCalculate After Waiting BarsCalculated | Symbol=", _Symbol,
      //       " | Period=", _Period,
      //       " | BarsCalculated(iBands)=", calculated);   
   //--- This block is executed when the indicator is initially attached to a chart
   if(prev_calculated == 0)
   {
      ArrayInitialize(MiddleBuffer, EMPTY_VALUE);
      ArrayInitialize(UpperBuffer,  EMPTY_VALUE);
      ArrayInitialize(LowerBuffer,  EMPTY_VALUE);

      int to_copy = MathMin(calculated, rates_total);

      // Copy all available data at once
      CopyBuffer(g_bb_handle, BASE_LINE,  0, to_copy, MiddleBuffer);
      CopyBuffer(g_bb_handle, UPPER_BAND, 0, to_copy, UpperBuffer);
      CopyBuffer(g_bb_handle, LOWER_BAND, 0, to_copy, LowerBuffer);
      // Print("DEBUG from OnCalculate First Initial | Symbol=", _Symbol,
      //       " | Period=", _Period,
      //       " | BarsCalculated(iBands)=", calculated);
      return rates_total;    
   }   
   //--- This block is executed on every new bar open
   if(prev_calculated != rates_total && prev_calculated != 0)
   {
      //==================================================
   // NEXT RUNS:
   // Only update the newest bar (index 0).
   // Do NOT shift arrays manually (series handles it).
   //==================================================
      double tmp[1];
      if(CopyBuffer(g_bb_handle, BASE_LINE, 0, 1, tmp) > 0)
      MiddleBuffer[0] = tmp[0];

      if(CopyBuffer(g_bb_handle, UPPER_BAND, 0, 1, tmp) > 0)
         UpperBuffer[0] = tmp[0];

      if(CopyBuffer(g_bb_handle, LOWER_BAND, 0, 1, tmp) > 0)
         LowerBuffer[0] = tmp[0];
      return rates_total;      
   }  
   return rates_total;
}
//+------------------------------------------------------------------+

bool FillArraysFromBuffers(
   double &base_values  [],   // MiddleBuffer
   double &upper_values [],   // UpperBuffer
   double &lower_values [],   // LowerBuffer
   int shift,                 // shift = 0 → realtime
   int ind_handle,
   int amount
)
{
   // NOTE:
   // Currently not used.
   // Kept for future helper / EA logic as planned.

   ResetLastError();
   if(CopyBuffer(ind_handle, BASE_LINE,  -shift, amount, base_values) < 0)
      return false;
   if(CopyBuffer(ind_handle, UPPER_BAND, -shift, amount, upper_values) < 0)
      return false;
   if(CopyBuffer(ind_handle, LOWER_BAND, -shift, amount, lower_values) < 0)
      return false;
   return true;
}
Very easy I just want to enable user to show or hide individual line such as BASE_LINE,UPPER_BAND,LOWER_BAND and Custom color only.
Problem 1 is:
You can see in picture attach, I don't know why I have green under chart.
Files:
Problem 1.JPG  217 kb
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