// https://forex-station.com/viewtopic.php?p=1295478806#p1295478806 //button code1
// https://forex-station.com/viewtopic.php?p=1295478883#p1295478883 //button code2
//+------------------------------------------------------------------+
//|                                EhlersPredictiveMovingAverage.mq5 |
//|                                Copyright 2020, Andrei Novichkov. |
//+------------------------------------------------------------------+
#property copyright "Copyright 2020, Andrei Novichkov."
#property link      "https://www.mql5.com/ru/users/andreifx60"
#property version   "1.00"
#property description "The Predictive Moving Average:\nJohn Ehlers, \"Rocket Science For Traders\", pg.212"

#property indicator_chart_window
#property indicator_buffers 4
#property indicator_color1  clrDodgerBlue;
#property indicator_color2  clrRed
#property indicator_color3  clrDarkSlateGray;
#property indicator_color4  clrDarkSlateGray;
#property indicator_width1  2
#property indicator_width2  2

//Forex-Station button template start41; copy and paste
extern string             button_note1_         = "------------------------------";
extern int                btn_Subwindow         = 0;                               // What window to put the button on.  If <0, the button will use the same sub-window as the indicator.
extern ENUM_BASE_CORNER   btn_corner            = CORNER_LEFT_UPPER;               // button corner on chart for anchoring
extern string             btn_text              = "EPMA";                          // a button name
extern string             btn_Font              = "Arial";                         // button font name
extern int                btn_FontSize          = 9;                               // button font size               
extern color              btn_text_ON_color     = clrLime;                         // ON color when the button is turned on
extern color              btn_text_OFF_color    = clrRed;                          // OFF color when the button is turned off
extern color              btn_background_color  = clrDimGray;                      // background color of the button
extern color              btn_border_color      = clrBlack;                        // border color the button
extern int                button_x              = 20;                              // x coordinate of the button     
extern int                button_y              = 25;                              // y coordinate of the button     
extern int                btn_Width             = 80;                              // button width
extern int                btn_Height            = 20;                              // button height
extern string             UniqueButtonID        = "Ehlers";                        // Unique ID for each button        
extern string             button_note2          = "------------------------------";

bool show_data, recalc=false;
string IndicatorObjPrefix, buttonId;
//Forex-Station button template end41; copy and paste

double  pb[],tr[],tc[],wma1[],wma2[];
//+------------------------------------------------------------------------------------------------------------------+
//Forex-Station button template start42; copy and paste
int OnInit()
{
   IndicatorDigits(Digits);
   IndicatorObjPrefix = "__" + btn_text + "__";
   
   // The leading "_" gives buttonId a *unique* prefix.  Furthermore, prepending the swin is usually unique unless >2+ of THIS indy are displayed in the SAME sub-window. (But, if >2 used, be sure to shift the buttonId position)
   buttonId = "_" + UniqueButtonID + IndicatorObjPrefix + "_BT_";
   if (ObjectFind(buttonId)<0) 
      createButton(buttonId, btn_text, btn_Width, btn_Height, btn_Font, btn_FontSize, btn_background_color, btn_border_color, btn_text_ON_color);
   ObjectSetInteger(0, buttonId, OBJPROP_YDISTANCE, button_y);
   ObjectSetInteger(0, buttonId, OBJPROP_XDISTANCE, button_x);

   init2();

   show_data = ObjectGetInteger(0, buttonId, OBJPROP_STATE);
   
   if (show_data) ObjectSetInteger(0,buttonId,OBJPROP_COLOR,btn_text_ON_color); 
   else ObjectSetInteger(0,buttonId,OBJPROP_COLOR,btn_text_OFF_color);
   return(INIT_SUCCEEDED);
}
//+------------------------------------------------------------------------------------------------------------------+
void createButton(string buttonID,string buttonText,int width2,int height,string font,int fontSize,color bgColor,color borderColor,color txtColor)
{
      ObjectDelete    (0,buttonID);
      ObjectCreate    (0,buttonID,OBJ_BUTTON,btn_Subwindow,0,0);
      ObjectSetInteger(0,buttonID,OBJPROP_COLOR,txtColor);
      ObjectSetInteger(0,buttonID,OBJPROP_BGCOLOR,bgColor);
      ObjectSetInteger(0,buttonID,OBJPROP_BORDER_COLOR,borderColor);
      ObjectSetInteger(0,buttonID,OBJPROP_BORDER_TYPE,BORDER_RAISED);
      ObjectSetInteger(0,buttonID,OBJPROP_XSIZE,width2);
      ObjectSetInteger(0,buttonID,OBJPROP_YSIZE,height);
      ObjectSetString (0,buttonID,OBJPROP_FONT,font);
      ObjectSetString (0,buttonID,OBJPROP_TEXT,buttonText);
      ObjectSetInteger(0,buttonID,OBJPROP_FONTSIZE,fontSize);
      ObjectSetInteger(0,buttonID,OBJPROP_SELECTABLE,0);
      ObjectSetInteger(0,buttonID,OBJPROP_CORNER,btn_corner);
      ObjectSetInteger(0,buttonID,OBJPROP_HIDDEN,1);
      ObjectSetInteger(0,buttonID,OBJPROP_XDISTANCE,9999);
      ObjectSetInteger(0,buttonID,OBJPROP_YDISTANCE,9999);
      // Upon creation, set the initial state to "true" which is "on", so one will see the indicator by default
      ObjectSetInteger(0, buttonId, OBJPROP_STATE, true);
}
//+------------------------------------------------------------------------------------------------------------------+
void OnDeinit(const int reason) 
{
   // If just changing a TF', the button need not be deleted, therefore the 'OBJPROP_STATE' is also preserved.
   if(reason != REASON_CHARTCHANGE) ObjectDelete(buttonId);
}
//+------------------------------------------------------------------------------------------------------------------+
void OnChartEvent(const int id, //don't change anything here
                  const long &lparam,
                  const double &dparam,
                  const string &sparam)
{
   // If another indy on the same chart has enabled events for create/delete/mouse-move, just skip this events up front because they aren't
   //    needed, AND in the worst case, this indy might cause MT4 to hang!!  Skipping the events seems to help, along with other (major) changes to the code below.
   if(id==CHARTEVENT_OBJECT_CREATE || id==CHARTEVENT_OBJECT_DELETE) return; // This appears to make this indy compatible with other programs that enabled CHART_EVENT_OBJECT_CREATE and/or CHART_EVENT_OBJECT_DELETE
   if(id==CHARTEVENT_MOUSE_MOVE    || id==CHARTEVENT_MOUSE_WHEEL)   return; // If this, or another program, enabled mouse-events, these are not needed below, so skip it unless actually needed. 

   if (id==CHARTEVENT_OBJECT_CLICK && sparam == buttonId)
   {
      show_data = ObjectGetInteger(0, buttonId, OBJPROP_STATE);
      
      if (show_data)
      {
         ObjectSetInteger(0,buttonId,OBJPROP_COLOR,btn_text_ON_color); 
         SetIndexStyle(0,DRAW_LINE);
         SetIndexStyle(1,DRAW_LINE);
         SetIndexStyle(2,DRAW_LINE);
         SetIndexStyle(3,DRAW_LINE);
         // Is it a problem to call 'start()' ??  Possibly it makes no difference, but now calling "mystart()" instead of "start()"; and "start()" simply runs "mystart()", so should be same as before.
         recalc=true;
         mystart();
      }
      else
      {
         ObjectSetInteger(0,buttonId,OBJPROP_COLOR,btn_text_OFF_color);
         for (int ForexStation2=0; ForexStation2<indicator_buffers; ForexStation2++)
              SetIndexStyle(ForexStation2,DRAW_NONE);
      }
   }
}
//Forex-Station button template end42; copy and paste
//+------------------------------------------------------------------------------------------------------------------+
int init2(){
   IndicatorBuffers(5);
   SetIndexBuffer(0,tr);   SetIndexLabel(0,"trigger");
   SetIndexBuffer(1,pb);   SetIndexLabel(1,"predict");
   SetIndexBuffer(2,wma1);
   SetIndexBuffer(3,wma2);
   SetIndexBuffer(4,tc);
   return(0);
  }
//+------------------------------------------------------------------------------------------------------------------+
void GetValue(int i) {
   wma1[i]=(7*(High[i  ]+Low[i  ]+Close[i  ])/3+6*
              (High[i+1]+Low[i+1]+Close[i+1])/3+5*
              (High[i+2]+Low[i+2]+Close[i+2])/3+4*
              (High[i+3]+Low[i+3]+Close[i+3])/3+3*
              (High[i+4]+Low[i+4]+Close[i+4])/3+2*
              (High[i+5]+Low[i+5]+Close[i+5])/3+
              (High[i+6]+Low[i+6]+Close[i+6])/3)/28;
   wma2[i]=(7*wma1[i]+6*wma1[i+1]+5*wma1[i+2]+4*wma1[i+3]+3*wma1[i+4]+2*wma1[i+5]+wma1[i+6])/28;

   tr[i]=2*wma1[i]-wma2[i];
   pb[i]=(4*tr[i]+3*tr[i+1]+2*tr[i+2]+tr[i+3])/10;

   if(pb[i]<tr[i])tc[i]=2;
   else
      if(pb[i]>tr[i])tc[i]=1;

}
//+------------------------------------------------------------------------------------------------------------------+
int start() {return(mystart()); }
//+------------------------------------------------------------------------------------------------------------------+
int mystart()
  {
   if (show_data)
      {
        int i, limit, counted_bars=IndicatorCounted();
        if(recalc) 
        {
           // If a button goes from off-to-on, everything must be recalculated.  The 'recalc' variable is used as a trigger to do this.
           counted_bars = 0;
           recalc=false;
        }
        
        limit = Bars - counted_bars;

        for(i=limit;i>=0;i--){GetValue(i);}

      } //if (show_data)  
      return(0);
  }
//+------------------------------------------------------------------------------------------------------------------+