//+------------------------------------------------------------------+
//|                                                    StepMA_v1.mq4 |
//|                           Copyright © 2005, TrendLaboratory Ltd. |
//|                                       E-mail: igorad2004@list.ru |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2005, TrendLaboratory Ltd."
#property link      "E-mail: igorad2004@list.ru"

#property indicator_chart_window
#property indicator_buffers 1
#property indicator_color1 Red
//---- input parameters
extern int StepSize=30;
extern int Advance=0;
extern int HighLow=0;
//---- indicator buffers
double LineBuffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
  int init()
  {
   string short_name;
//---- indicator line
   SetIndexStyle(0,DRAW_LINE,STYLE_SOLID,1);
   SetIndexShift(0,Advance);
   SetIndexBuffer(0,LineBuffer);
   IndicatorDigits(MarketInfo(Symbol(),MODE_DIGITS));
//---- name for DataWindow and indicator subwindow label
   short_name="StepMA("+StepSize+")";
   IndicatorShortName(short_name);
   SetIndexLabel(0,"StepMA");
//----
   SetIndexDrawBegin(0,1);
//----
   return(0);
  }

//+------------------------------------------------------------------+
//| StepMA_v1                                                         |
//+------------------------------------------------------------------+
int start()
  {
   int shift,trend;
   double smin0,smax0,smin1,smax1;

   
   for(shift=Bars-1;shift>=0;shift--)
   {	
	if (HighLow>0)
	  {
	  smax0=Low[shift]+2*StepSize*Point;
	  smin0=High[shift]-2*StepSize*Point;
	
	  if(Close[shift]>smax1) trend=1; 
	  if(Close[shift]<smin1) trend=-1;
	  }
	 
	if (HighLow == 0)
	  {
	  smax0=Close[shift]+2*StepSize*Point;
	  smin0=Close[shift]-2*StepSize*Point;
	
	  if (Close[shift]>smax1)  trend=1; 
	  if (Close[shift]<smin1)  trend=-1;
	  }
	 	
	  if(trend>0 && smin0<smin1) smin0=smin1;
	  if(trend<0 && smax0>smax1) smax0=smax1;
		
	  if (trend>0) LineBuffer[shift]=smin0+StepSize*Point;
	  if (trend<0) LineBuffer[shift]=smax0-StepSize*Point;
	  
	  smin1=smin0;
	  smax1=smax0;
	 }
	return(0);	
 }