Tutorial how to work with classes!

[Willem Huisman]

Search engine doesnt give me the exampe i seek!!

I'm looking an good and step by step tutorial how to create a class. For example a class that can open 4 buttens.

Someone got a good tutorial?

 

Thank you in forwarding!! 

[Carl Schreiber]

Do you know the magnifier on the top right corner on this page?

Open it and enter OOP and start reading!

[Willem Huisman]

Carl Schreiber:

Do you know the magnifier on the top right corner on this page?

Open it and enter OOP and start reading!

Ok, i got something like this. Is that good?

 

It opens 4 labels that when you move them go back to the original place. And refreshes the first label according to the close and open price or current barr! 

 

//+------------------------------------------------------------------+
//|                                              Countdown Class.mq4 |
//|                        Copyright 2016, MetaQuotes Software Corp. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2016, MetaQuotes Software Corp."
#property link      "https://www.mql5.com"
#property version   "1.00"
#property strict
#property indicator_chart_window
int OnInit(){
   EventSetMillisecondTimer(1000);
   return(INIT_SUCCEEDED);
  
}
int OnCalculate(const int rates_total,
                const int prev_calculated,
                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[]){
  
   return(rates_total);
  }
void OnTimer(){
   Analyze one,two,three,four;
   one.bars = 1;
   two.bars = 2;
   three.bars = 3;
   four.bars = 4;
   Label een,twee,drie,vier;
  
   een.num = 1;
   een.text = DoubleToString(one.avg(),5);
   een.SetText();
   een.Location();
   twee.num = 2;
   twee.text = DoubleToString(two.avg(),5);
   twee.SetText();
   twee.Location();
   drie.num = 3;
   drie.text = DoubleToString(three.avg(),5);
   drie.SetText();
   drie.Location();
   vier.num = 4;
   vier.text = DoubleToString(four.avg(),5);
   vier.SetText();
   vier.Location();
}
class Analyze{
   public:
   int bars;
   double GetAVG(void);
   double avg(){return(GetAVG());}
  
   private:
   double open(){return(iOpen("J225",PERIOD_D1,bars));}
   double close(){return(iClose("J225",PERIOD_D1,bars));}
};

double Analyze::GetAVG(void){
   return((open()+close())/2);
}
class Label{
   public:
   int num;
   int x;
   int y;
   string text;
   void Location(void);
   void SetText(void);
  
};
void Label::Location(void){
   if(ObjectFind(0,"label"+IntegerToString(num,0,0)))ObjectCreate(0,"label"+IntegerToString(num,0,0),OBJ_LABEL,0,0,0);
   if(ObjectGetInteger(0,"label"+IntegerToString(num,0,0),OBJPROP_XDISTANCE,0)!= (5))ObjectSetInteger(0,"label"+IntegerToString(num,0,0),OBJPROP_XDISTANCE,5);
   if(ObjectGetInteger(0,"label"+IntegerToString(num,0,0),OBJPROP_YDISTANCE,0)!= (num*15))ObjectSetInteger(0,"label"+IntegerToString(num,0,0),OBJPROP_YDISTANCE,num*15);
}
void Label::SetText(void){
   ObjectSetText("label"+IntegerToString(num,0,0),text,10,NULL,clrBlack);
}