ATR Channels

//+------------------------------------------------------------------+
//|                                                 ATR Channels.mq4 |
//|                         Copyright © 2005, Luis Guilherme Damiani |
//|                                      http://www.damianifx.com.br |
//+------------------------------------------------------------------+

#property copyright "Copyright © 2005, Luis Guilherme Damiani"
#property link      "http://www.damianifx.com.br"
#property indicator_chart_window
#property  indicator_buffers 7
#property  indicator_color1  Lime       //Moving Average
#property  indicator_color2  Aqua // Lower band 1
#property  indicator_color3  Yellow // Upper band 1
#property  indicator_color4  DodgerBlue        // Lower band 2
#property  indicator_color5  Orange        // Upper band 2
#property  indicator_color6  Blue         // Lower band 3
#property  indicator_color7  Red         // Upper band 3
//---- indicator buffers
double MA_Buffer0[];
double Ch1up_Buffer1[];
double Ch1dn_Buffer2[];
double Ch2up_Buffer3[];
double Ch2dn_Buffer4[];
double Ch3up_Buffer5[];
double Ch3dn_Buffer6[];
//---- input parameters
extern int    PeriodsATR = 18;
extern int    MA_Periods = 49;
extern int    MA_type = MODE_LWMA;
extern double Mult_Factor1 = 1.6;
extern double Mult_Factor2 = 3.2;
extern double Mult_Factor3 = 4.8;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
   string mat;
//---7- indicators
// MA
   SetIndexStyle(0, DRAW_LINE);
   SetIndexBuffer(0, MA_Buffer0);
   SetIndexDrawBegin(0, MathMax(PeriodsATR, MA_Periods));
  // ATR 1 up
   SetIndexStyle(1, DRAW_LINE);
   SetIndexBuffer(1, Ch1up_Buffer1);
   SetIndexDrawBegin(1, MathMax(PeriodsATR, MA_Periods));
   string  sATRu1 = StringConcatenate("ATRu(", PeriodsATR, ", ", Mult_Factor1, ")"); 
   SetIndexLabel(1, sATRu1);
  // ATR 1 down
   SetIndexStyle(2, DRAW_LINE);
   SetIndexBuffer(2, Ch1dn_Buffer2);
   SetIndexDrawBegin(2, MathMax(PeriodsATR, MA_Periods));
   string  sATRd1 = StringConcatenate("ATRd(", PeriodsATR, ", ", Mult_Factor1, ")"); 
   SetIndexLabel(2, sATRd1);
// ATR 2 up
   SetIndexStyle(3, DRAW_LINE);
   SetIndexBuffer(3, Ch2up_Buffer3);
   SetIndexDrawBegin(3, MathMax(PeriodsATR, MA_Periods));
   string  sATRu2 = StringConcatenate("ATRu(", PeriodsATR, ", ", Mult_Factor2, ")"); 
   SetIndexLabel(3, sATRu2);
  // ATR 2 down
   SetIndexStyle(4, DRAW_LINE);
   SetIndexBuffer(4, Ch2dn_Buffer4);
   SetIndexDrawBegin(4, MathMax(PeriodsATR, MA_Periods));
   string  sATRd2 = StringConcatenate("ATRd(", PeriodsATR, ", ", Mult_Factor2, ")"); 
   SetIndexLabel(4, sATRd2);
   // ATR 3 up
   SetIndexStyle(5, DRAW_LINE);
   SetIndexBuffer(5, Ch3up_Buffer5);
   SetIndexDrawBegin(5, MathMax(PeriodsATR, MA_Periods));
   string  sATRu3 = StringConcatenate("ATRu(", PeriodsATR, ", ", Mult_Factor3, ")"); 
   SetIndexLabel(5, sATRu3);
  // ATR 3 down
   SetIndexStyle(6, DRAW_LINE);
   SetIndexBuffer(6, Ch3dn_Buffer6);
   SetIndexDrawBegin(6, MathMax(PeriodsATR, MA_Periods));
   string  sATRd3 = StringConcatenate("ATRd(", PeriodsATR, ", ", Mult_Factor3, ")"); 
   SetIndexLabel(6, sATRd3);
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custor indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
  {
   if(Bars <= MathMax(PeriodsATR, MA_Periods))
       return(0);
   int fixed_bars = IndicatorCounted();
//---- check for possible errors
   if(fixed_bars < 0) 
       return(-1);
//---- last counted bar will be recounted
   if(fixed_bars > 0) 
       fixed_bars--;
   int limit = Bars - fixed_bars;
//----
   for(int i = 0; i < limit; i++)
     {
       double atr = iATR(NULL, 0, PeriodsATR, i);
       double ma = iMA(NULL, 0, MA_Periods, 0, MA_type, PRICE_TYPICAL, i);
       MA_Buffer0[i] = ma;
       Ch1up_Buffer1[i] = ma + atr*Mult_Factor1;
       Ch1dn_Buffer2[i] = ma - atr*Mult_Factor1;
       
       Ch2up_Buffer3[i] = ma + atr*Mult_Factor2;
       Ch2dn_Buffer4[i] = ma - atr*Mult_Factor2;
       
       Ch3up_Buffer5[i] = ma + atr*Mult_Factor3;
       Ch3dn_Buffer6[i] = ma - atr*Mult_Factor3;
     }  
//----
   return(0);
  }
//+------------------------------------------------------------------+