//+------------------------------------------------------------------+
//|                                                  RoundLevels.mq4 |
//|                                        Version 2, "For Codebase" |
//|                                                   Author: Martes |
//|               http://championship.mql4.com/2007/ru/users/Martes/ |
//+------------------------------------------------------------------+
/*
   This code draws 4 horizontal lines with "00" at the end of
   the vertical coordinate (price). This 4 horizontal lines with
   this property are closest to current price.
*/

#property copyright "Martes"
#property link      "http://championship.mql4.com/2007/ru/users/Martes/"

#property indicator_chart_window
#property indicator_buffers 4
#property indicator_color1 Red
#property indicator_color2 MidnightBlue
#property indicator_color3 Orange
#property indicator_color4 MediumBlue

//Width of horizontal lines
extern int LineWidth=2;
//Do we need the previous value of the indicator?
extern bool KeepTraces;

//---- buffers
double Lower1[];
double Upper1[];
double Lower2[];
double Upper2[];
//---- names of horizontal lines
string Lower1Line="Lower1Line",
       Upper1Line="Upper1Line",
       Lower2Line="Lower2Line",
       Upper2Line="Upper2Line";
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
   SetIndexStyle(0,DRAW_LINE);
   SetIndexBuffer(0,Lower1);
   SetIndexStyle(1,DRAW_LINE);
   SetIndexBuffer(1,Upper1);
   SetIndexStyle(2,DRAW_LINE);
   SetIndexBuffer(2,Lower2);
   SetIndexStyle(3,DRAW_LINE);
   SetIndexBuffer(3,Upper2);
//---- initial indicator values
   //closest lower "round" bound for price change
    Lower1[0]=MathFloor((Close[0]/Point)/100)*Point*100;
    //closest upper "round" bound for price change
    Upper1[0]=MathCeil((Close[0]/Point)/100)*Point*100;
    //next lower "round" bound (after Lower1) for price change
    Lower2[0]=Lower1[0]-100*Point;
    //next upper "round" bound (after Upper1) for price change
    Upper2[0]=Upper1[0]+100*Point;
//---- create horizontal lines
   if(!ObjectCreate(Lower1Line, OBJ_HLINE, 0, D'2004.02.20 12:30', Lower1[0]))
    {
     Print("error: can't create horizontal line! code #",GetLastError());
     return(0);
    }
    else
    {
      ObjectSet(Lower1Line, OBJPROP_COLOR, indicator_color1);
      ObjectSet(Lower1Line, OBJPROP_WIDTH, LineWidth);
    }
    if(!ObjectCreate(Upper1Line, OBJ_HLINE, 0, D'2004.02.20 12:30', Upper1[0]))
    {
     Print("error: can't create horizontal line! code #",GetLastError());
     return(0);
    }
    else
    {
      ObjectSet(Upper1Line, OBJPROP_COLOR, indicator_color2);
      ObjectSet(Upper1Line, OBJPROP_WIDTH, LineWidth);
    }
    if(!ObjectCreate(Lower2Line, OBJ_HLINE, 0, D'2004.02.20 12:30', Lower2[0]))
    {
     Print("error: can't create horizontal line! code #",GetLastError());
     return(0);
    }
    else
    {
      ObjectSet(Lower2Line, OBJPROP_COLOR, indicator_color3);
      ObjectSet(Lower2Line, OBJPROP_WIDTH, LineWidth);
    }
    if(!ObjectCreate(Upper2Line, OBJ_HLINE, 0, D'2004.02.20 12:30', Upper2[0]))
    {
     Print("error: can't create horizontal line! code #",GetLastError());
     return(0);
    }
    else
    {
      ObjectSet(Upper2Line, OBJPROP_COLOR, indicator_color4);
      ObjectSet(Upper2Line, OBJPROP_WIDTH, LineWidth);
    }
//--- horizontal lines created
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
//----
   if(ObjectFind(Lower1Line)==0)
      ObjectDelete(Lower1Line);
   if(ObjectFind(Upper1Line)==0)
      ObjectDelete(Upper1Line);
   if(ObjectFind(Lower2Line)==0)
      ObjectDelete(Lower2Line);
   if(ObjectFind(Upper2Line)==0)
      ObjectDelete(Upper2Line);
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
  {
   int    counted_bars=IndicatorCounted();
//----
    //closest lower "round" bound for price change
    Lower1[0]=MathFloor((Close[0]/Point)/100)*Point*100;
    //closest upper "round" bound for price change
    Upper1[0]=MathCeil((Close[0]/Point)/100)*Point*100;
    //next lower "round" bound (after Lower1) for price change
    Lower2[0]=Lower1[0]-100*Point;
    //next upper "round" bound (after Upper1) for price change
    Upper2[0]=Upper1[0]+100*Point;
//----
   if(ObjectFind(Lower1Line)==0)
      ObjectSet(Lower1Line, OBJPROP_PRICE1, Lower1[0]);
   if(ObjectFind(Upper1Line)==0)
      ObjectSet(Upper1Line, OBJPROP_PRICE1, Upper1[0]);
   if(ObjectFind(Lower2Line)==0)
     ObjectSet(Lower2Line, OBJPROP_PRICE1, Lower2[0]);
   if(ObjectFind(Upper2Line)==0)
      ObjectSet(Upper2Line, OBJPROP_PRICE1, Upper2[0]);
//----
   if(!KeepTraces)
   {
      Lower1[1]=EMPTY_VALUE;
      Upper1[1]=EMPTY_VALUE;
      Lower2[1]=EMPTY_VALUE;
      Upper2[1]=EMPTY_VALUE;
   }
   return(0);
  }
//+------------------------------------------------------------------+