mql5/Indicators/Examples/WPR.mq5

<EFBFBD><EFBFBD>//+------------------------------------------------------------------+

//|                                                          WPR.mq5 |

//|                             Copyright 2000-2025, MetaQuotes Ltd. |

//|                                             https://www.mql5.com |

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

#property copyright   "Copyright 2000-2025, MetaQuotes Ltd."

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

#property description "Larry Williams' Percent Range"

//--- indicator settings

#property indicator_separate_window

#property indicator_level1     -20.0

#property indicator_level2     -80.0

#property indicator_levelstyle STYLE_DOT

#property indicator_levelcolor clrSilver

#property indicator_levelwidth 1

#property indicator_maximum    0.0

#property indicator_minimum    -100.0

#property indicator_buffers    1

#property indicator_plots      1

#property indicator_type1      DRAW_LINE

#property indicator_color1     clrDodgerBlue

//--- input parameters

input int InpWPRPeriod=14; // Period

//--- indicator buffers

double    ExtWPRBuffer[];

//--- global variables

int       ExtPeriodWPR;

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

//| Custom indicator initialization function                         |

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

void OnInit()

  {

//--- check for input value

   if(InpWPRPeriod<3)

     {

      ExtPeriodWPR=14;

      Print("Incorrect InpWPRPeriod value. Indicator will use value=",ExtPeriodWPR);

     }

   else

      ExtPeriodWPR=InpWPRPeriod;

//--- indicator's buffer

   SetIndexBuffer(0,ExtWPRBuffer);

   PlotIndexSetInteger(0,PLOT_DRAW_BEGIN,ExtPeriodWPR-1);

//--- name for DataWindow and indicator subwindow label

   IndicatorSetString(INDICATOR_SHORTNAME,"%R"+"("+string(ExtPeriodWPR)+")");

//--- digits

   IndicatorSetInteger(INDICATOR_DIGITS,2);

  }

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

//| Williams  Percent Range                                          |

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

int OnCalculate(const int rates_total,

                const int prev_calculated,

                const datetime &time[],

                const double &open[],