istddev

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

//|                                   Standard Deviation Channel.mq4 |

//|                                           Copyright 2015, Awran5 |

//|                                                 awran5@yahoo.com |

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

#property copyright "Awran5"

#property link      "awran5@yahoo.com"

#property version   "1.00"

#property description "Simple indicator to show 2 levels of Standard Deviation Channel on your chart"

#property strict

#property indicator_chart_window



extern int    FirstBar              = 1;           // First Bar

extern int    LastBar               = 50;          // Last Bar

extern ENUM_TIMEFRAMES FixedPeriod  = 0;           // Time Frame to use

input string  lb_0                  = "";          // ----- CHANNEL --------------------------------------

extern double cDeviation            = 1.618;       // Channel Deviation

extern ENUM_LINE_STYLE cStyle       = 0;           // Channel Style

extern color  cColor                = clrRoyalBlue;// Channel Color

extern int    cWidth                = 1;           // Channel Width

input string  lb_1                  = "";          // ----- LEVELS ---------------------------------------

extern double lDeviation            = 0.618;       // Levels Deviation

extern ENUM_LINE_STYLE lStyle       = 0;           // Levels Style

extern color  lColor                = clrGold;     // Levels Color

extern int    lWidth                = 1;           // Levels Width

//---

string StdDevChannel="StdDev Channel",StdDevLevels="StdDev Levels";

datetime FirstBarTime,LastBarTime;

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

//| Custom indicator initialization function                         |

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

int OnInit()

  {

//--- indicator buffers mapping

//---- indicator short name

   IndicatorShortName("iStdDev");

//---

   return(INIT_SUCCEEDED);

  }

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

//| deinitialization function                                        |

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

void OnDeinit(const int reason)

  {

//---

   if(ObjectFind(StdDevChannel) >= 0)  ObjectDelete(StdDevChannel);

   if(ObjectFind(StdDevLevels)  >= 0)  ObjectDelete(StdDevLevels);

   Comment("");

//---

  }

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

//| 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[])

  {

//---

   int counted_bars=IndicatorCounted(),

   limit=Bars-counted_bars,

   i;

   if(counted_bars < 0)  return(-1);

   if(counted_bars>0) counted_bars--;



   for(i=limit-1; i>=0; i--)

     {

      FirstBarTime = iTime(NULL, FixedPeriod, i+FirstBar);

      LastBarTime  = iTime(NULL, FixedPeriod, i+LastBar);

     }



   DrawSDChannel(StdDevChannel,cDeviation,LastBarTime,FirstBarTime,cColor,cStyle,cWidth);

   DrawSDChannel(StdDevLevels,lDeviation,LastBarTime,FirstBarTime,lColor,lStyle,lWidth);



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

   return(rates_total);

  }

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

//|                                                                  |

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

void DrawSDChannel(string name,double deviation,datetime t1,datetime t2,color clr,int style,int width)

  {

//---

   ObjectDelete(name);

   ObjectCreate(name,OBJ_STDDEVCHANNEL,0,t1,0,t2,0);

   ObjectSet(name,OBJPROP_DEVIATION,deviation);

   ObjectSet(name,OBJPROP_COLOR,clr);

   ObjectSet(name,OBJPROP_STYLE,style);

   ObjectSet(name,OBJPROP_WIDTH,width);

   ObjectSet(name,OBJPROP_RAY,true);

//---

  }

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