How to call OnCalculate() function at a specific timing

[stitchtrader]

Hello Guys!

The OnCalculate() function is called when a new tick is received.

Is it possible to call it at a specific timing?

Example:

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[])
  {
            //
  }
void OnChartEvent(const int id,
                  const long& lparam,
                  const double& dparam,
                  const string& sparam
                  )
  {
     if(id==CHARTEVENT_CHART_CHANGE)
     {
          //Call OnCalculate() again here
     }
  }

 

 

 

[Alain Verleyen]

stitchtrader:

Hello Guys!

The OnCalculate() function is called when a new tick is received.

Is it possible to call it at a specific timing?

...

No you can't. Why do you need that, maybe there is a workaround.

[stitchtrader]

angevoyageur:
No you can't. Why do you need that, maybe there is a workaround.

Hi Alain! Thank you xx :)

I got it.

I need that because to modify the objects size and location when the chart size changes.

And time[], open[], high[], low[] and close[] arrays are necessary.

Maybe I should work around to make arrays with like CopyTime function et cetera?

 

[Alain Verleyen]

stitchtrader:

Hi Alain! Thank you xx :)

I got it.

I need that because to modify the objects size and location when the chart size changes.

And time[], open[], high[], low[] and close[] arrays are necessary.

Maybe I should work around to make arrays with like CopyTime function et cetera?

 

Yes you are right, the best way is to use CopyXXXX functions in the OnChartEvent().

Another solution would be to set a flag when OnChartEvent() is raised and to process your objects in OnCalculate() but that would be on the next tick.

[stitchtrader]

angevoyageur:

Yes you are right, the best way is to use CopyXXXX functions in the OnChartEvent().

Another solution would be to set a flag when OnChartEvent() is raised and to process your objects in OnCalculate() but that would be on the next tick.

Thank you Alain!  I'll try that.

Have a nice day ♫

[Ahmed Sabry Mohammed Youssef Elgendi]

Alain Verleyen #:

Yes you are right, the best way is to use CopyXXXX functions in the OnChartEvent().

Another solution would be to set a flag when OnChartEvent() is raised and to process your objects in OnCalculate() but that would be on the next tick.

Hi Alain

How can I set a flag of "OnCalculate" On so that I could call it again?

[Alain Verleyen]

Ahmed Sabry Mohammed Youssef Elgendi #:

Hi Alain

How can I set a flag of "OnCalculate" On so that I could call it again?

You can't set a flag to "call it again".

Why do you need to call OnCalculate() yourself ?

[Ahmed Sabry Mohammed Youssef Elgendi]

in MQL4, the "Start" can be called in functions like this :

void handleButtonClicks()
  {
   if(ObjectGetInteger(ChartID(), buttonId, OBJPROP_STATE))
     {
      ObjectSetInteger(ChartID(), buttonId, OBJPROP_STATE, false);
      show_data = !show_data;
      start();
     }
  }

but in MQL5, since it's "OnCalculate" function, we won't able to do like :

void handleButtonClicks()
  {
   if(ObjectGetInteger(ChartID(), buttonId, OBJPROP_STATE))
     {
      ObjectSetInteger(ChartID(), buttonId, OBJPROP_STATE, false);
      show_data = !show_data;

      OnCalculate();
     }
  }

my main objective is to "hide/show" lines of zigzag indicator by clicking on a button, 

[Alain Verleyen]

You don't need to call OnCalculate() at all to hide/show a line.

You can just play with DRAW_TYPE :

  PlotIndexSetInteger(plotIndex,PLOT_DRAW_TYPE,DRAW_NONE);

[Ahmed Sabry Mohammed Youssef Elgendi]

I also tried below code, it hiding the line correctly, but it won't replace (show) the line afterwards :

void handleButtonClicks()
  {
   if(ObjectGetInteger(ChartID(), buttonId, OBJPROP_STATE))
     {
      ObjectSetInteger(ChartID(), buttonId, OBJPROP_STATE, false);
      show_data = !show_data;
  

   if(show_data)
     {
      ObjectSetInteger(ChartID(),buttonId,OBJPROP_COLOR,btn_text_ON_color);
      ObjectSetString(ChartID(),buttonId,OBJPROP_TEXT,btn_unpressed);
      PlotIndexSetInteger(0,PLOT_DRAW_TYPE,DRAW_SECTION); // PlotIndexSetInteger(0,PLOT_DRAW_TYPE,DRAW_LINE);
      
     ChartRedraw(0);
     }
   else
     {
      ObjectSetInteger(ChartID(),buttonId,OBJPROP_COLOR,btn_text_OFF_color);
      ObjectSetString(ChartID(),buttonId,OBJPROP_TEXT,btn_pressed);
      PlotIndexSetInteger(0,PLOT_DRAW_TYPE,DRAW_NONE);
     }  
     
     
     
     }
  }