ZigZag_AutoChannel_001

//Version: 2
//Time: December 02, 2006
//+------------------------------------------------------------------+
//|                       ZigZag Channels                            | 
//|                                              ZigZag_Channels.mq4 |
//|                                         Developed by Coders Guru |
//|                                            http://www.xpworx.com |
//+------------------------------------------------------------------+


#property indicator_chart_window
#property indicator_buffers 4
#property indicator_color1 Red


//---- indicator parameters
extern   int      ExtDepth       = 12;
extern   int      ExtDeviation   = 5;
extern   int      ExtBackstep    = 3;
extern   color    color_trend_1  = Yellow;
extern   color    color_trend_2  = Yellow;
extern   int      back           = 1;

//---- indicator buffers
double ExtMapBuffer[];
double ExtMapBuffer2[];
double upperband[];
double lowerband[];

int deinit()
{
   ObjectDelete("trend_1"); 
   ObjectDelete("trend_2"); 
   return (0);
}

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
   IndicatorBuffers(4);
//---- drawing settings
   SetIndexStyle(0,DRAW_SECTION);
//---- indicator buffers mapping
   SetIndexBuffer(0,ExtMapBuffer);
   SetIndexBuffer(1,ExtMapBuffer2);
   SetIndexBuffer(2,upperband);
   SetIndexBuffer(3,lowerband);
   
   SetIndexLabel(0,NULL) ;
   SetIndexLabel(1,NULL) ;
   SetIndexLabel(2,"Upper band") ;
   SetIndexLabel(3,"Lower band") ;
   
   SetIndexEmptyValue(0,0.0);
   ArraySetAsSeries(ExtMapBuffer,true);
   ArraySetAsSeries(ExtMapBuffer2,true);
   ArraySetAsSeries(upperband,true);
   ArraySetAsSeries(lowerband,true);

   //ObjectDelete("trend_1"); 
   //ObjectDelete("trend_2"); 
   return(0);
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
int start()
  {
   int    shift, back,lasthighpos,lastlowpos;
   double val,res;
   double curlow,curhigh,lasthigh,lastlow;

   for(shift=Bars-ExtDepth; shift>=0; shift--)
     {
      val=Low[Lowest(NULL,0,MODE_LOW,ExtDepth,shift)];
      if(val==lastlow) val=0.0;
      else 
        { 
         lastlow=val; 
         if((Low[shift]-val)>(ExtDeviation*Point)) val=0.0;
         else
           {
            for(back=1; back<=ExtBackstep; back++)
              {
               res=ExtMapBuffer[shift+back];
               if((res!=0)&&(res>val)) ExtMapBuffer[shift+back]=0.0; 
              }
           }
        } 
      ExtMapBuffer[shift]=val;
      //--- high
      val=High[Highest(NULL,0,MODE_HIGH,ExtDepth,shift)];
      if(val==lasthigh) val=0.0;
      else 
        {
         lasthigh=val;
         if((val-High[shift])>(ExtDeviation*Point)) val=0.0;
         else
           {
            for(back=1; back<=ExtBackstep; back++)
              {
               res=ExtMapBuffer2[shift+back];
               if((res!=0)&&(res<val)) ExtMapBuffer2[shift+back]=0.0; 
              } 
           }
        }
      ExtMapBuffer2[shift]=val;
     }

   // final cutting 
   lasthigh=-1; lasthighpos=-1;
   lastlow=-1;  lastlowpos=-1;

   for(shift=Bars-ExtDepth; shift>=0; shift--)
     {
      curlow=ExtMapBuffer[shift];
      curhigh=ExtMapBuffer2[shift];
      if((curlow==0)&&(curhigh==0)) continue;
      //---
      if(curhigh!=0)
        {
         if(lasthigh>0) 
           {
            if(lasthigh<curhigh) ExtMapBuffer2[lasthighpos]=0;
            else ExtMapBuffer2[shift]=0;
           }
         //---
         if(lasthigh<curhigh || lasthigh<0)
           {
            lasthigh=curhigh;
            lasthighpos=shift;
           }
         lastlow=-1;
        }
      //----
      if(curlow!=0)
        {
         if(lastlow>0)
           {
            if(lastlow>curlow) ExtMapBuffer[lastlowpos]=0;
            else ExtMapBuffer[shift]=0;
           }
         //---
         if((curlow<lastlow)||(lastlow<0))
           {
            lastlow=curlow;
            lastlowpos=shift;
           } 
         lasthigh=-1;
        }
     }
  
   for(shift=Bars-1; shift>=0; shift--)
     {
      if(shift>=Bars-ExtDepth) ExtMapBuffer[shift]=0.0;
      else
        {
         res=ExtMapBuffer2[shift];
         if(res!=0.0) ExtMapBuffer[shift]=res;
        }
     }
     DrawTrends();
     
     for(shift=Bars-1; shift>=0; shift--)
     {
       upperband[shift]=    ObjectGetValueByShift("trend_1",shift);
       lowerband[shift]=    ObjectGetValueByShift("trend_2",shift);
     }
}
  
  
void DrawTrends()
{
   double temp = 0;
   int count = 0;
   double save_0 , save_1 , save_2 , save_3;
   int    t_0 , t_1 , t_2 , t_3;

   //get last up
   for(int i = 0 ; i < Bars ; i++)
   {
      temp = ExtMapBuffer[i];
      if (temp != 0) count++;
//      Print("count:", count);      
      if(count == back + 1 && temp != 0) {save_0 = temp; t_0 = i;}
      if(count == back + 2 && temp != 0) {save_1 = temp; t_1 = i;}
      if(count == back + 3 && temp != 0) {save_2 = temp; t_2 = i;}
      if(count == back + 4 && temp != 0) {save_3 = temp; t_3 = i;}
      if(count == back + 5) break;
   }
   count = 0;
   //draw trends
//   Print(save_0,":",save_1,":",save_2,":",save_3);
   if((ObjectFind("trend_2")==-1) || (ObjectFind("trend_2")==-1))
   {
   ObjectCreate("trend_2",OBJ_TREND,0,iTime(NULL,0,t_3),save_3,iTime(NULL,0,t_1),save_1);
   ObjectCreate("trend_1",OBJ_TREND,0,iTime(NULL,0,t_2),save_2,iTime(NULL,0,t_0),save_0);    
   ObjectSet("trend_1",OBJPROP_STYLE,STYLE_SOLID);
   ObjectSet("trend_2",OBJPROP_STYLE,STYLE_SOLID);
   ObjectSet("trend_1",OBJPROP_WIDTH,2);
   ObjectSet("trend_2",OBJPROP_WIDTH,2);
   ObjectSet("trend_1",OBJPROP_COLOR,color_trend_1);
   ObjectSet("trend_2",OBJPROP_COLOR,color_trend_2);
   }
   else
   {
   if (save_2!=0)
      {
      ObjectMove("trend_1", 0,iTime(NULL,0,t_2),save_2);
      ObjectMove("trend_1", 1,iTime(NULL,0,t_0),save_0);
      ObjectMove("trend_2", 0,iTime(NULL,0,t_3),save_3);
      ObjectMove("trend_2", 1,iTime(NULL,0,t_1),save_1);     
      }
   }
}