Price scale changing

Lorentzos Roussos 2022.12.15 21:00 #1

Petr Nosek:

Can we detect that the scale of the price axis has changed when the price rises/falls outside the original interval on the price axis?

I thought this should be handled by a function OnChartEvent with id CHARTEVENT_CHART_CHANGE, but unfortunately not.

As in when the chart does that on its own ?

Since it can change on tick (only) i'd assume a copy of the price max and price min can be kept and checked against .

Will test that

ChartGetDouble(ChartID(),CHART_PRICE_MIN,0);
ChartGetDouble(ChartID(),CHART_PRICE_MAX,0;

if that's what you meant :

#property strict
//+------------------------------------------------------------------+
//| Expert initialization function                                   |
//+------------------------------------------------------------------+
double scaleMax=0.0,scaleMin=0.0;
int OnInit()
  {

  scale_changed(scaleMax,scaleMin,0);
  return(INIT_SUCCEEDED);
  }

void OnTick()
  {
//---
  if(scale_changed(scaleMax,scaleMin,0)){
    Comment("Scale changed to "+DoubleToString(scaleMin,_Digits)+"-"+DoubleToString(scaleMax,_Digits));
    }
  }

bool scale_changed(double &max,double &min,int subwindow){
bool change=false;
double _max=ChartGetDouble(ChartID(),CHART_PRICE_MAX,subwindow);
double _min=ChartGetDouble(ChartID(),CHART_PRICE_MIN,subwindow);
if(_max!=max||_min!=min){
change=true;
}
max=_max;
min=_min;
return(change);
}

volume between 2 points The impact of the Any questions from newcomers

Petr Nosek 2022.12.15 21:22 #2

Lorentzos Roussos #:

As in when the chart does that on its own ?

Since it can change on tick (only) i'd assume a copy of the price max and price min can be kept and checked against .

Yes that's exactly what I mean (when the chart does it on its own). I was hoping that this could be handled somehow with OnChartEvent, but if that's not possible, I'll have to use some solution similar to what you suggested. Thanks.

Start or restart of How to get data OrderCalcMargin equivalent for mql4

Lorentzos Roussos 2022.12.15 22:01 #3

Petr Nosek #:

Yes that's exactly what I mean (when the chart does it on its own). I was hoping that this could be handled somehow with OnChartEvent, but if that's not possible, I'll have to use some solution similar to what you suggested. Thanks.

Yeah , i don't think there is unless a more experienced coder has found one .