Which code replicates the double-click over the Y axis in fix-scale mode?

[Martin Bittencourt]

Hi,

I'd like to reproduce as code the following steps:

1. Scale to max zoom out
2. Increase the value of the min and maximum Y axis (so, if it's plotting $10 - $20, the scales will be like $5 - $25).
3. Set scales to fix mode
4. Scale to "normal", original zoom
5. Double-click over the Y axis

The result will be an axis bar like this:

I already know how to do most of those steps; only the 5th item, the double-click, I don't know how to do it by code. I thought it would be using CHART_PRICE_MAX and CHART_PRICE_MIN, but those seems to be read-only values. So, how can I do this double-click by code? I couldn't find any suitable canditate in all the variables regarding ChartSetDouble (or ChartSetInteger).

[Ryan L Johnson]

This should get you started:

//+------------------------------------------------------------------+
//| Gets chart scale (from 0 to 5)                                   |
//+------------------------------------------------------------------+
int ChartScaleGet(const long chart_ID=0)
  {
//--- prepare the variable to get the property value
   long result=-1;
//--- reset the error value
   ResetLastError();
//--- receive the property value
   if(!ChartGetInteger(chart_ID,CHART_SCALE,0,result))
     {
      //--- display the error message in Experts journal
      Print(__FUNCTION__+", Error Code = ",GetLastError());
     }
//--- return the value of the chart property
   return((int)result);
  }
//+------------------------------------------------------------------+
//| Sets chart scale (from 0 to 5)                                   |
//+------------------------------------------------------------------+
bool ChartScaleSet(const long value,const long chart_ID=0)
  {
//--- reset the error value
   ResetLastError();
//--- set property value
   if(!ChartSetInteger(chart_ID,CHART_SCALE,0,value))
     {
      //--- display the error message in Experts journal
      Print(__FUNCTION__+", Error Code = ",GetLastError());
      return(false);
     }
//--- successful execution
   return(true);
  }

[Ryan L Johnson]

If you want to capture double clicks, you'll need to time 2 clicks of CHARTEVENT_CLICK or CHARTEVENT_OBJECT_CLICK: