/*
 * Filename:    DayImpulse2DD.mq4
 * Author:      DriverDan, based on the original by Tartan at the link below
 * Date:        Nov 3, 2005
 *
 * Description: Sums the close - open for the past "per" bars and shifts it forward
 *              "drawShift" bars. Works very well at predicting movement.
 *
 *              Signal2 is just the current bar's close - open shifted "drawShift"
 *              periods forward. This is what you see as the main signal draws. It
 *              isn't updated as time moves forward so that you have something to look
 *              back on.
 *
 *              WARNING: Looking at past bars will be deceiving. It may look like it
 *              predicts perfectly on some pairs but remember that it is constantly
 *              updated. The most accurate live bar is the current one.
 *
 *              The future is not set.
 *
 * Version:     2DD
 *              Released by DriverDan
 *              Almost all of the code has been changed or rewritten.
 *              Added Signal2.
 *
 *              1.1
 *              Released by DriverDan
 *              Fix horrible style, removed extra buffer, changed to draw from the
 *              beginning, added MA, and fixed gaps in signal.
 *
 *              1.0
 *              Initial release
 *              http://www.arkworldmarket.ru/forum/showthread.php?t=966&page=2&pp=10
 */

#property indicator_separate_window
#property indicator_buffers 3
#property indicator_color1  Gold
#property indicator_color2  White
#property indicator_color3  DodgerBlue

extern int per        = 14;  // Period for signal
extern int drawShift  = 14;  // Forward shift
extern int useMA      = 1;   // 1 = use MA
extern int maPeriod   = 34;  // Moving average period
extern int useSignal2 = 1;   // Show current close - open shifted forward

// Buffers for signals
double ExtMapBuffer[];
double maBuffer[];
double closeBuffer[];
   
int init() {
   string title = "DayImplus(" + per + ")";
   
   // Signal and MA are normal lines
   SetIndexStyle(0, DRAW_LINE);
   SetIndexBuffer(0, ExtMapBuffer);
   SetIndexStyle(1, DRAW_LINE);
   SetIndexBuffer(1, maBuffer);
   
   // Signal2 is a dotted line
   SetIndexStyle(2, DRAW_LINE, 2, 1);
   SetIndexBuffer(2, closeBuffer);
   
   // Shift everything forward
   SetIndexShift(0, drawShift);
   SetIndexShift(1, drawShift);
   SetIndexShift(2, drawShift);
   
   // Titles for each line
   SetIndexLabel(0, "Signal(" + per + ")");
   SetIndexLabel(1, "MA(" + maPeriod + ")");
   SetIndexLabel(2, "Signal2(" + per + ")");
   
   if(useMA == 1) {
      title = title + " MA(" + maPeriod + ")";
   }
   
   IndicatorShortName(title);
   return(0);
}

int start() {
   int    counted_bars = IndicatorCounted();
   int    shift, i, imp, limit, lim;

   // This is to make sure we go back and update bars that have already been drawn.
   // This was missing in the original release. If it's not done the live signal line
   // will be the same as Signal2.
   if(counted_bars > per) {
      limit = Bars - counted_bars + 13;
   } else {
      limit = Bars - 1;
   }

   // Loop through and calculate the signals. Everytime this runs we recalculate the
   // current and all future signals. The future is not set :)
   for(shift = limit; shift >= 0; shift--) {
      imp = 0;

      // This isn't really needed but makes sure we don't look for future,
      // non-existant open and close points. It's just proper coding. You never know
      // how a program will handle variables that don't exist. MT4 currently sets them
      // to zero but you don't know if that will change.
      if(shift - per < 0) {
         lim = 0;
      } else {
         lim = shift - per;
      }

      // Calculate the signal
      for(i = shift; i >= lim; i--) {
         imp = imp + (Close[i] - Open[i]) / Point;
      }

      ExtMapBuffer[shift] = imp;
      
      // If Signal2 is being used set it.
      if(useSignal2 == 1) {
         closeBuffer[i] = (Close[i] - Open[i]) / Point;
      }
   }
   
   // If we're using the MA calculate it.
   if(useMA == 1) {
      for(shift = Bars - counted_bars - 1; shift >= 0; shift--) {
         if(shift < Bars - maPeriod && shift < Bars - per) {
            maBuffer[shift] = iMAOnArray(ExtMapBuffer, 0, maPeriod, 0, MODE_SMA, shift);
         }
      }
   }
   
   return(0);
}