Learn New MQL Coding

Quoting pooh123

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Hi, Anyone can help on this ? In old verion of MetaEditor, you can search for help easily. However, in the new MetaEditor, search doesn't work. For example, if you want to search for explanations for OrderSend(), you input "OrderSend()" in the Search field, and then click List Topics, a message will pop up, showing "No topics found". Is there a way to resolve this ? Thanks in advance

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class MyArrow {
   string m_Name;
  
   public:
      MyArrow( string name, bool up, color clr );
      void SetPoint( datetime time, double price );
};

MyArrow::MyArrow( string name, bool up, color clr){
   m_Name = name;
   if( up ){
      ObjectCreate( ChartID(), m_Name, OBJ_ARROW_UP, 0, 0 , 0 );  
   }
   else{
      ObjectCreate( ChartID(), m_Name, OBJ_ARROW_DOWN, 0, 0 , 0 );  
   }
   ObjectSet( m_Name, OBJPROP_COLOR, clr );
}

void MyArrow::SetPoint( datetime time, double price ){
   ObjectSetInteger( ChartID(), m_Name, OBJPROP_TIME1, time );
   ObjectSetDouble( ChartID(), m_Name, OBJPROP_PRICE1, price );
}

static void ShowCrossings( const int totalrates, const datetime& time[], MyMovingAverage& fastma, MyMovingAverage& slowma );

void MyMovingAverage::ShowCrossings( const int totalrates, const datetime& time[], MyMovingAverage& fastma, MyMovingAverage& slowma ) {
  
   string ArrowName;
  
   ArraySetAsSeries( fastma.m_Buffer, false );
   ArraySetAsSeries( slowma.m_Buffer, false );
   ArraySetAsSeries( time, false );
  
   // We look only for visible bars in the chart
   int Start = totalrates - WindowBarsPerChart() + 1;
  
   for( int i=Start; i<totalrates; i++ ){
      // up arrow
      if( fastma.m_Buffer[i-1] <= slowma.m_Buffer[i-1] && fastma.m_Buffer[i] > slowma.m_Buffer[i] ){
         ArrowName = ARROW_PREFIX + i;
         // We create a new object only if it doesn't exist
         if( ObjectFind( ArrowName ) < 0 ){
            MyArrow Arrow( ArrowName, true, clrGreen );
            Arrow.SetPoint( time[i], slowma.m_Buffer[i] );
         }
        
      }
      // down arrow
      if( fastma.m_Buffer[i-1] >= slowma.m_Buffer[i-1] && fastma.m_Buffer[i] < slowma.m_Buffer[i] ){
         ArrowName = ARROW_PREFIX + i;
         // We create a new object only if it doesn't exist
         if( ObjectFind( ArrowName ) < 0 ){
            MyArrow Arrow( ArrowName, false, clrRed );
            Arrow.SetPoint( time[i], slowma.m_Buffer[i] );
         }
      }
   }
}

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[])
{
   ArraySetAsSeries( time, false );
  
   FastMA.Compute( rates_total, prev_calculated, open, high, low, close );
   SlowMA.Compute( rates_total, prev_calculated, open, high, low, close );
  
   MyMovingAverage::ShowCrossings( rates_total, time, FastMA, SlowMA );
  
  
   return(rates_total);
  
}

void MyArrow::SetPoint( datetime time, double price ){
   ObjectSetInteger( ChartID(), m_Name, OBJPROP_TIME1, time );
   if( m_Up ){
      ObjectSetDouble( ChartID(), m_Name, OBJPROP_PRICE1, price );
   }
   else{
      // Make some pixel adjustment to down arrow.
      int ChartHeightPixels = ChartGetInteger(ChartID(), CHART_HEIGHT_IN_PIXELS );
      double PriceMax = ChartGetDouble( ChartID(), CHART_PRICE_MAX );
      double PriceMin = ChartGetDouble( ChartID(), CHART_PRICE_MIN );
      double PricePerPixel = (PriceMax-PriceMin) / ChartHeightPixels;
      ObjectSetDouble( ChartID(), m_Name, OBJPROP_PRICE1, price + 16 * PricePerPixel );
   }
}

static void ShowCrossings( const int totalrates, const datetime& time[], MyMovingAverage& fastma, MyMovingAverage& slowma );

static void ShowCrossings( const int totalrates, const datetime& time[], MyMovingAverage* fastma, MyMovingAverage* slowma );

Quoting Halley

Disliked

Very nice work, I bet you have been teaching the OOP! I noticed a detail - you use different syntax for passing objects as parameters, which I did not even know it was possible with the MQL4. Either I missed it in the beginning, or it did not work in the beginning. Nevertheless they do work both. static void ShowCrossings( const int totalrates, const datetime& time[], MyMovingAverage& fastma, MyMovingAverage& slowma ); while I have been using static void ShowCrossings( const int totalrates, const datetime& time[], MyMovingAverage* fastma, MyMovingAverage*...

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MyClass MyObject;
MyObject.Method();
 
MyClass* pMyObject;
pMyObject->Method()
 
MyClass& rMyObject;
rMyObject.Method();

MyClass MyObject;
MyObject.Method()
 
MyClass* pMyObject;
pMyObject.Method()
 
MyClass& rMyClass;
rMyClass.Method();

Quoting broketrader

Disliked

but if anyone passing by would like to propose to write something from scratch using the new MQL language with or without OOP I could be interested. We could even start a new thread for that.

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Quoting Kiads

Disliked

{quote} Hi Sir, sorry for my bad English, is it possible to create offline chart /renko chart builder indicator with full OOP and make it more lighter for CPU, since the current offline chart builder (including mine), use a lot of CPU resources due to read/write hst file process ? Really appreciate your guidance, and ready to learn from the beginning.. Thank You In Advance. MTH

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Quoting broketrader

Disliked

{quote} Hi Kiads, Off course it's possible but I don't know if the result will be as lighter as you hope for the CPU. OOP is a way of writting code, not an optimization to gain cpu cycles. If I understand well, you want an indicator that reads it data from an history (hst) file and not for a live chart ?

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Quoting Kiads

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{quote} Yes Sir, Offline Chart builder Indicator (not EA or script) that create offline chart like renko chart, rangebars chart, tick chart, or non standard candlestick chart like period converter.. but of course it will emulate online chart just like standard candlestick charts. best regard. MTH

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Quoting broketrader

Disliked

{quote} If you open an offline chart and that you apply to it a renko indicator wouldn't that be exactly what you want ?

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Quoting broketrader

Disliked

{quote} If you open an offline chart and that you apply to it a renko indicator wouldn't that be exactly what you want ?

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Quoting Kiads

Disliked

{quote} Nope, not like that, renko chart builder indicator, read history from source data of M1 standard candlestick chart, and create new offline hst file, and write to it and the heavy part is emulate online chart in that offline chart in every new incoming tick from M1 source data chart. BTW, don't you ever use offline renko chart Sir ? MTH

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Quoting FerruFx

Disliked

{quote} No. The renko indicator he is talking about is the builder which has to be applied on a M1 live chart.

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Quoting Kiads

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{quote} Thank You Sir.. , You explained more simple than me..

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Quoting Kiads

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{quote} BTW, don't you ever use offline renko chart Sir ? MTH

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Quoting broketrader

Disliked

{quote} No, never used it. Sorry for my ignorance. Thanks FerruFx for answering also. So, if I understand : 1. You open a 1 min chart of let's say EURUSD and apply to it the renko builder indicator we are talking about. 2. The indicator opens the 1 min history file for that symbol and creates a new hst file, let's say EURUSD1R.hst (R is for Renko). 3. And then the user must open offline that EURUSD1R.hst file which is by the way updated on each new tick on the chart we opened at point 1. Im I correct ?

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Quoting Kiads

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{quote} Yes Sir, that exactly what the builder job is..

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