Drawing a horizontal line

if it is possible to draw a line  referring to the "High value" between 00.00 and 07.00 am of the current day.

1. Play video	Please edit your post. For large amounts of code, attach it.

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2. Of course it's possible. Use a trend line.
   #define HR2400 (PERIOD_D1 * 60)  // 86400 = 24 * 3600
   int      TimeOfDay(datetime when=0){      if(when == 0)  when = TimeCurrent();
                                             return( when % HR2400 );            }
   datetime DateOfDay(datetime when=0){      if(when == 0)  when = TimeCurrent();
                                             return( when - TimeOfDay(when) );   }
   //datetime Tomorrow( datetime when=0){      if(when == 0)  when = TimeCurrent();
   //                                          return(DateOfDay(when) + HR2400);   }
   //datetime Yesterday(datetime when=0){      if(when == 0)  when = TimeCurrent();
   //   int iD1 = iBarShift(NULL, PERIOD_D1, DateOfDay(when) - 1);
   //                                       return( iTime(NULL, PERIOD_D1, iD1) ); }
   
      #define HR0700 25200 // 7 * 3600
      datetime bod = DateOfDay();
      datetime AM7 = bod + HR0700;
      double   HighD1 = iHigh(NULL, PERIOD_D1,1);
      ObjectCreate(chart_id,daily_high, OBJ_TLINE, 0, bod,     HighD1,            AM7, HighD1,0,0);
      ObjectSet(daily_high, OBJPROP_RAY, false);
   // ObjectCreate(chart_id,daily_high, OBJ_HLINE, 0, Time[0], iHigh(NULL, PERIOD_D1,1), 0, 0,0,0);
   

Look up iHighest().

Timeframe would be H1.

Type would be MODE_HIGH. 

Count would be 7.

Start would be hour of day minus 7.

Then iHigh() and iTime() for H1 and the value from iHighest().