Function/property to catch the first visible bar/date within a chart

Function/property to catch the first visible bar/date within a chart

Alexander Horn
2014-06-04 19:23:58

I would like to update the reference/index date for this formula dynamically each time the chart scroll bar is moved, so that index date corresponds to first visible on the chart:

a = CompareAssets("ILF;EPP;SHY", "01/06/2003");

Currently have a script that does this based on "selected chart changed", but it crashes frequently.
Chart chart = Charts.GetSelectedChart();
DateTime startdate = chart.VisibleStartDate;
Global.SetVariable("Date",startdate);
int curbar = chart.ScrollBarIndex;
Global.SetVariable("Bars",curbar);
chart.Update();

Is there a function/property to catch the first visible bar/date within a chart? like a = CompareAssets("ILF;EPP;SHY", Chart.VisibleStartDate());

QuantShare
2014-06-05 08:01:38

Hi Alexander,

You cannot do that within the function. The script is the best solution. What is exactly the code you are using? It is crashing probably because it is running too many times within a very short period.

Alexander Horn
2014-06-05 08:14:01

Here the script, which triggers on "selected chart changed". Indeed it crashes when I change too quick, but can live with it. Thanks anyway, Alex

Script:
string[] assets = new String[20];
assets = Watchlist.GetSymbols("TAA_Basic_Selection_Static");
string Assets = "";

for(int j=0;j<assets.Length;j++)
{
Assets = Assets + ";" + assets[j].ToString();
}
Global.SetVariable("Symbols",Assets);

Chart chart = Charts.GetSelectedChart();
DateTime startdate = chart.VisibleStartDate;
Global.SetVariable("Date",startdate);
int curbar = chart.ScrollBarIndex;
Global.SetVariable("Bars",curbar);
chart.Update();

Function sniplet which catches global vars:
string Assets = Global.GetVariable("Symbols").ToString();
string[] assets = Assets.Split(';');
string Date = Global.GetVariable("Date").ToString();
int curbar = (int) Global.GetVariable("Bars");

QuantShare
2014-06-05 08:50:11

Alex, please try this script.

string id = "";
while(true)
{
Chart chart = Charts.GetSelectedChart();
DateTime startdate = chart.VisibleStartDate;
string newID = chart.SymbolName + " - " + startdate.ToString();
if(id != newID)
{
string[] assets = new String[20];
assets = Watchlist.GetSymbols("TAA_Basic_Selection_Static");
string Assets = "";

for(int j=0;j<assets.Length;j++)
{
Assets = Assets + ";" + assets[j].ToString();
}
Global.SetVariable("Symbols",Assets);

Global.SetVariable("Date",startdate);
int curbar = chart.ScrollBarIndex;
Global.SetVariable("Bars",curbar);
chart.Update();
}
App.Main.Sleep(500);
}

Alexander Horn
2014-06-05 20:07:15

Works perfectly, thanks! Will upload chart setting if of use to others.

One f/up question: In the following I extract the assets to get timeseries, but how can I get fullname and other symbol data?
string Assets = Global.GetVariable("Symbols").ToString();
string[] assets = Assets.Split(';');
VectorD closes = cFunctions.GetTimeframeData(assets[1], (int)cFunctions.Timeframe, "close").ToVectorD();

something like cFunctions.SymbolInfo(assets[1]).FullName.. but SymbolInfo does not have parameter.

QuantShare
2014-06-06 07:52:25

Best Answer

Hi Alex,

There is an undocumented way to get this:

Symbols symbols = new Symbols();
Symbol symbol = symbols.GetSymbol("A");
Global.Trace2(symbol.FullName);

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