//+------------------------------------------------------------------+
//|                                                     Rj_Slice.mq4 |
//|                           Copyright © 2011, RJ Rjabkov Aleksandr |
//|                                                     rj-a@mail.ru |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2011, RJ Rjabkov Aleksandr"
#property link      "rj-a@mail.ru"

#property indicator_chart_window

extern int DepthCalcDay       = 5;
extern double UpdateTime      = 1;
extern bool BackgroundLevelOn = true;

double lBuy[];
double lSell[];
static datetime LastTime=0;
static datetime StartTime=1;
int init() {
  return(0);
}

int deinit() {
  for (int i=0; i<3000; i++) {ObjectDelete("vhb "+i); ObjectDelete("V "+i);}
  return(0);
}
 
int start() {
  if(LastTime < StartTime) {
    int i, j, MaxVolume, EndTime, VolSlice;
    color ColLine;
    int TimeVisiblBar = WindowBarsPerChart()-WindowFirstVisibleBar();
    double MaxPrice = iHigh(NULL, PERIOD_D1, 0);
    double MinPrice = iLow(NULL, PERIOD_D1, 0);
    for(j=DepthCalcDay; j>=0; j--) {
      MaxPrice = MathMax(MaxPrice, iHigh(NULL, PERIOD_D1, j));
      MinPrice = MathMin(MinPrice, iLow(NULL, PERIOD_D1, j));
    }
    int Range = MathRound((MaxPrice-MinPrice)/Point);
    
    ArrayResize(lBuy, Range+1);
    ArrayInitialize(lBuy, 0.0);
    ArrayResize(lSell, Range+1);
    ArrayInitialize(lSell, 0.0);
    
    for(i=0; i<=Range; i++) {
      lBuy[i]  = iCustom(NULL, PERIOD_M1, "Rj_Volume", DepthCalcDay, 0, i);
      lSell[i] = iCustom(NULL, PERIOD_M1, "Rj_Volume", DepthCalcDay, 1, i);
    }
    
    if(MathRound(lBuy[ArrayMaximum(lBuy)])>=MathRound(lSell[ArrayMaximum(lSell)])) MaxVolume=MathRound(lBuy[ArrayMaximum(lBuy)]); 
    else MaxVolume=MathRound(lSell[ArrayMaximum(lSell)]);
    
    if(TimeVisiblBar<=2) TimeVisiblBar=50;
    
    for (i=0; i<=Range; i++) {ObjectDelete("vhb "+i); ObjectDelete("V "+i);}
    
    for(i=0; i<=Range; i++) {
      if(BackgroundLevelOn) {
        if(lBuy[i]>lSell[i]) {
          ColLine=C'64,136,50';
        }
        if(lBuy[i]<lSell[i]) {
          ColLine=C'218,118,125';
        }
        if(lBuy[i]==lSell[i]) {
          ColLine=Aqua;
        }
        ObjectCreate("vhb "+i, OBJ_RECTANGLE, 0, TimeStart(), MinPrice+i*Point, iTime(NULL, PERIOD_D1, DepthCalcDay), MinPrice+(i+1)*Point);
        ObjectSet("vhb "+i, OBJPROP_STYLE, DRAW_HISTOGRAM);
        ObjectSet("vhb "+i, OBJPROP_COLOR, ColLine);
        ObjectSet("vhb "+i, OBJPROP_BACK, true);
      }
      if(!BackgroundLevelOn) {
        if(lBuy[i]>lSell[i]) {
          EndTime = TimeStart()-(TimeVisiblBar-1)*Period()*60;
          ColLine=C'64,136,50';
        }
        if(lBuy[i]<lSell[i]) {
          EndTime = TimeStart()-(TimeVisiblBar-1)*Period()*60;
          ColLine=C'218,118,125';
        }
        if(lBuy[i]==lSell[i]) {
          EndTime = TimeStart()-(TimeVisiblBar-1)*Period()*60;
          ColLine=Aqua;
        }
        ObjectCreate("vhb "+i, OBJ_RECTANGLE, 0, TimeStart(), MinPrice+i*Point, EndTime, MinPrice+(i+1)*Point);
        ObjectSet("vhb "+i, OBJPROP_STYLE, DRAW_HISTOGRAM);
        ObjectSet("vhb "+i, OBJPROP_COLOR, ColLine);
        ObjectSet("vhb "+i, OBJPROP_BACK, true);
      }
    }
  InstallVolume(lBuy, lSell, MinPrice, TimeVisiblBar);
  StartTime=MathRound(TimeCurrent()+UpdateTime*60);
  }
  LastTime = TimeCurrent();
  return(0);
}
//+------------------------------------------------------------------+
datetime TimeStart() {
  int Indention = Time[0]+(WindowBarsPerChart()-WindowFirstVisibleBar())*Period()*60;
  return(Indention);
}

void InstallVolume(double ArrBuy[], double ArrSell[], double pos, int TimePos) {
  int shift, j;
  double DifBuy[], DifSell[], exit;
  
  ArrayResize(DifBuy, ArraySize(ArrBuy)+1);
  ArrayInitialize(DifBuy, 0.0);
  ArrayResize(DifSell, ArraySize(ArrBuy)+1);
  ArrayInitialize(DifSell, 0.0);
  
  for(shift=0; shift<=ArraySize(ArrBuy); shift++) {
    if(ArrBuy[shift]>ArrSell[shift]) DifBuy[shift]=MathRound((ArrBuy[shift]-ArrSell[shift])*100);
    if(ArrBuy[shift]<ArrSell[shift]) DifSell[shift]=MathRound((ArrSell[shift]-ArrBuy[shift])*100);
  }

  for(shift=1; shift<=ArraySize(ArrBuy); shift++) {
    double Volue=0.0;
    if(DifBuy[shift-1]!=0.0 && DifBuy[shift]==0.0) {
      j = shift-1;
      while(DifBuy[j]!=0.0) {
        Volue += DifBuy[j];
        j--;
      }
      exit = pos+(shift+j+4)*Point/2;
      ObjectCreate("V "+shift, OBJ_TEXT, 0, TimeStart()-((TimePos-6)*Period()*60), exit);
      ObjectSetText("V "+shift, DoubleToStr(Volue, 0),8,"Tahoma",GreenYellow);
    }
    if(DifSell[shift-1]!=0.0 && DifSell[shift]==0.0) {
      j = shift-1;
      while(DifSell[j]!=0.0) {
        Volue += DifSell[j];
        j--;
      }
      exit = pos+(shift+j+4)*Point/2;
      ObjectCreate("V "+shift, OBJ_TEXT, 0, TimeStart()-((TimePos-15)*Period()*60), exit);
      ObjectSetText("V "+shift, DoubleToStr(Volue, 0),8,"Tahoma",Maroon);
    }
  }
}