ytg_Trend

//+------------------------------------------------------------------+ 
//|                                                    ytg_Trend.mq5 | 
//|                                   Copyright © 2009, Yuriy Tokman | 
//|                                            yuriytokman@gmail.com | 
//+------------------------------------------------------------------+ 
#property copyright "Copyright © 2009, Yuriy Tokman"
#property link "yuriytokman@gmail.com"
#property description "Trend indicator"
//---- indicator version number
#property version   "1.00"
//---- drawing indicator in a separate window
#property indicator_separate_window
//---- number of indicator buffers
#property indicator_buffers 2 
//---- only one plot is used
#property indicator_plots   1
//+-----------------------------------+
//|  Indicator drawing parameters     |
//+-----------------------------------+
//---- drawing the indicator as a multy-color histogram
#property indicator_type1   DRAW_COLOR_HISTOGRAM
//---- the following colors are used in the histogram
#property indicator_color1  clrMagenta,clrMediumVioletRed,clrGray,clrTeal,clrLime
//---- Indicator line width is equal to 2
#property indicator_width1  2
//---- displaying the indicator label
#property indicator_label1  "ytg_Trend"

//+-----------------------------------+
//|  INDICATOR INPUT PARAMETERS       |
//+-----------------------------------+
input uint Length=16; //indicator calculation period                   
input int Shift=0; // horizontal shift of the indicator in bars
//+-----------------------------------+

//---- declaration of dynamic arrays that will further be 
// used as indicator buffers
double IndBuffer[];
double ColorIndBuffer[];

//---- Declaration of integer variables of data starting point
int min_rates_total,Level;
//+------------------------------------------------------------------+   
//| ytg_Trend indicator initialization function                      | 
//+------------------------------------------------------------------+ 
void OnInit()
  {
//---- Initialization of variables of the start of data calculation
   min_rates_total=int(Length);
   Level=min_rates_total-1;

//---- set dynamic array as an indicator buffer
   SetIndexBuffer(0,IndBuffer,INDICATOR_DATA);
//---- indexing elements in the buffer as time series
   ArraySetAsSeries(IndBuffer,true);
//---- moving the indicator 1 horizontally
   PlotIndexSetInteger(0,PLOT_SHIFT,Shift);
//---- performing the shift of beginning of indicator drawing
   PlotIndexSetInteger(0,PLOT_DRAW_BEGIN,min_rates_total);
//---- setting the indicator values that won't be visible on a chart
   PlotIndexSetDouble(0,PLOT_EMPTY_VALUE,0.0);

//---- setting dynamic array as a color index buffer   
   SetIndexBuffer(1,ColorIndBuffer,INDICATOR_COLOR_INDEX);
//---- indexing elements in the buffer as time series
   ArraySetAsSeries(ColorIndBuffer,true);

//---- initializations of variable for indicator short name
   string shortname;
   StringConcatenate(shortname,"ytg_Trend(",Length,", ",Shift,")");
//---- creating name for displaying if separate sub-window and in tooltip
   IndicatorSetString(INDICATOR_SHORTNAME,shortname);

//---- determine the accuracy of displaying indicator values
   IndicatorSetInteger(INDICATOR_DIGITS,0);

//---- the number of the indicator 3 horizontal levels   
   IndicatorSetInteger(INDICATOR_LEVELS,3);   
//---- values of the indicator horizontal levels   
   IndicatorSetDouble(INDICATOR_LEVELVALUE,0,+Level);
   IndicatorSetDouble(INDICATOR_LEVELVALUE,1,0);
   IndicatorSetDouble(INDICATOR_LEVELVALUE,2,-Level);
//---- gray and magenta colors are used for horizontal levels lines  
   IndicatorSetInteger(INDICATOR_LEVELCOLOR,0,clrBlue);
   IndicatorSetInteger(INDICATOR_LEVELCOLOR,1,clrGray);
   IndicatorSetInteger(INDICATOR_LEVELCOLOR,2,clrBlue);
//---- short dot-dash is used for the horizontal level line  
   IndicatorSetInteger(INDICATOR_LEVELSTYLE,0,STYLE_DASHDOTDOT);
   IndicatorSetInteger(INDICATOR_LEVELSTYLE,1,STYLE_DASHDOTDOT);
   IndicatorSetInteger(INDICATOR_LEVELSTYLE,2,STYLE_DASHDOTDOT);
   
//---- end of initialization
  }
//+------------------------------------------------------------------+ 
//| ytg_Trend iteration function                                     | 
//+------------------------------------------------------------------+ 
int OnCalculate(
                const int rates_total,    // amount of history in bars at the current tick
                const int prev_calculated,// amount of history in bars at the previous tick
                const datetime &time[],
                const double &open[],
                const double &high[],
                const double &low[],
                const double &close[],
                const long &tick_volume[],
                const long &volume[],
                const int &spread[]
                )
  {
//---- checking the number of bars to be enough for calculation
   if(rates_total<min_rates_total) return(0);

//---- declaration of variables with a floating point  
   double price;
//---- Declaration of integer variables
   int limit,k,bar,rasr;

//---- calculation of the starting number limit for the bar recalculation loop
   if(prev_calculated>rates_total || prev_calculated<=0)// checking for the first start of the indicator calculation
      limit=rates_total-min_rates_total-1; // starting index for the calculation of all bars
   else limit=rates_total-prev_calculated;  // starting index for calculation of new bars only

//---- indexing elements in arrays as timeseries  
   ArraySetAsSeries(high,true);
   ArraySetAsSeries(low,true);

//---- main indicator calculation loop
   for(bar=limit; bar>=0 && !IsStopped(); bar--)
     {
      rasr=int(Length);
      price=high[bar];
      IndBuffer[bar]=0.0;

      if(price>high[bar+1])
        {
         k=1;
         while(price>high[bar+k])
           {
            k++;
            if(k>rasr)break;
           }

         IndBuffer[bar]=+(k-1);
        }

      rasr=int(Length);
      price=low[bar];

      if(price<low[bar+1])
        {
         k=1;
         while(price<low[bar+k])
           {
            k++;
            if(k>rasr){break;}
           }
         
         IndBuffer[bar]=-(k-1);
        }

      ColorIndBuffer[bar]=2;
      if(IndBuffer[bar]>0) if(IndBuffer[bar]>+Level) ColorIndBuffer[bar]=4; else ColorIndBuffer[bar]=3;
      if(IndBuffer[bar]<0) if(IndBuffer[bar]<-Level) ColorIndBuffer[bar]=0; else ColorIndBuffer[bar]=1;
     }
//----     
   return(rates_total);
  }
//+------------------------------------------------------------------+