Simple_Support_Resistance

ÿþ//+------------------------------------------------------------------+

//|                                    Simple_Support_Resistance.mq5 |

//|                        Copyright 2018, MetaQuotes Software Corp. |

//|                                                 https://mql5.com |

//+------------------------------------------------------------------+

#property copyright "Copyright 2018, MetaQuotes Software Corp."

#property link      "https://mql5.com"

#property version   "1.00"

#property description "Simple Support/Resistance indicator"

#property indicator_chart_window

#property indicator_buffers 2

#property indicator_plots   2

//--- plot Resistance

#property indicator_label1  "Resistance"

#property indicator_type1   DRAW_LINE

#property indicator_color1  clrRed

#property indicator_style1  STYLE_SOLID

#property indicator_width1  2

//--- plot Support

#property indicator_label2  "Support"

#property indicator_type2   DRAW_LINE

#property indicator_color2  clrGreen

#property indicator_style2  STYLE_SOLID

#property indicator_width2  2

//--- input parameters

input uint     InpPeriod      =  15;   // Period

input uint     InpBarsBefore  =  50;   // Lines length

//--- indicator buffers

double         BufferRes[];

double         BufferSup[];

//--- global variables

int            period;

int            bars_before;

//+------------------------------------------------------------------+

//| Custom indicator initialization function                         |

//+------------------------------------------------------------------+

int OnInit()

  {

//--- set global variables

   period=int(InpPeriod<1 ? 1 : InpPeriod);

   bars_before=int(InpBarsBefore<2 ? 2 : InpBarsBefore);

//--- indicator buffers mapping

   SetIndexBuffer(0,BufferRes,INDICATOR_DATA);

   SetIndexBuffer(1,BufferSup,INDICATOR_DATA);

//--- setting indicator parameters

   IndicatorSetString(INDICATOR_SHORTNAME,"Support/Resistance("+(string)period+")");

   IndicatorSetInteger(INDICATOR_DIGITS,Digits());

//--- setting buffer arrays as timeseries

   ArraySetAsSeries(BufferRes,true);

   ArraySetAsSeries(BufferSup,true);

//---

   return(INIT_SUCCEEDED);

  }

//+------------------------------------------------------------------+

//| Custom indicator iteration 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[])

  {

//--- @>25@:0 =0 <8=8<0;L=>5 :>;85AB2> 10@>2 4;O @0AGQB0

   if(rates_total<period || rates_total<bars_before) return 0;

//--- #AB0=>2:0 <0AA82>2 1CD5@>2 :0: B09<A5@89

   ArraySetAsSeries(high,true);

   ArraySetAsSeries(low,true);

//--- @>25@:0 8 @0AGQB :>;8G5AB20 ?@>AG8BK205<KE 10@>2

   int limit=rates_total-prev_calculated;

   if(limit>1)

     {

      limit=rates_total-1;

      ArrayInitialize(BufferRes,EMPTY_VALUE);

      ArrayInitialize(BufferSup,EMPTY_VALUE);

     }

//--- >43>B>2:0 40==KE

   int bl=Lowest(period,1);

   int bh=Highest(period,1);

   if(bl==WRONG_VALUE || bh==WRONG_VALUE) return 0;

   double min=low[bl];

   double max=high[bh];

   double Sup=2*min-max;

   double Res=2*max-min;

//---  0AGQB 8=48:0B>@0

   for(int i=0; i<bars_before && !IsStopped(); i++)

     {

      BufferRes[i]=Res;

      BufferSup[i]=Sup;

     }

   BufferRes[bars_before]=EMPTY_VALUE;

   BufferSup[bars_before]=EMPTY_VALUE;

   

//--- return value of prev_calculated for next call

   return(rates_total);

  }

//+------------------------------------------------------------------+

//| >72@0I05B 8=45:A <0:A8<0;L=>3> 7=0G5=8O B09<A5@88 High          |

//+------------------------------------------------------------------+

int Highest(const int count,const int start)

  {

   double array[];

   ArraySetAsSeries(array,true);

   if(CopyHigh(Symbol(),PERIOD_CURRENT,start,count,array)==count)

      return ArrayMaximum(array)+start;

   return WRONG_VALUE;

  }

//+------------------------------------------------------------------+

//| >72@0I05B 8=45:A <8=8<0;L=>3> 7=0G5=8O B09<A5@88 Low            |

//+------------------------------------------------------------------+

int Lowest(const int count,const int start)

  {

   double array[];

   ArraySetAsSeries(array,true);

   if(CopyLow(Symbol(),PERIOD_CURRENT,start,count,array)==count)

      return ArrayMinimum(array)+start;

   return WRONG_VALUE;

  }

//+------------------------------------------------------------------+