Loop MarketDataEvents

[keepsimple]

Hi, is it possible to loop through marketdata events / updates? for example if I wanted to loop through the marketdata events which happened between bar 10 and 20 when currentbar is 30, how whould i do that?
one additional question: is it possible to force recalculation of an indicator programmatically?

Regards and thanks

[NinjaTrader_ChelseaB]

Hello keepsimple,

With NinjaTrader 8, OnMarketData will trigger historically if Tick replay is enabled for that data series.

However, there is not a data series created for the market data. This means that if you want to be able to call this information back in time, then you would need to store each market data to a variable or collection like an array.

So as each OnMarketData event comes in, save this to a collection and you can call this from your collection at any time.


Also, to trigger an indicator to recalculate you can either run a loop for every bar and set all of the historical values to your liking, or you can trigger the historical data to be reloaded.
ReloadAllHistoricalData();

[keepsimple]

Thanks Chelsea,

solved that, could you please give me a headsup, on how to get the bar number of a mouse clicked bar.

Regards and thanks

[NinjaTrader_ChelseaB]

Hello keepsimple,

From the mouse down or mouse up override use GetSlotByX and use the x of the mouse pointer.

The approach for this may be different depending on what type of class you are working in.

private void OnMouseDown(object sender, MouseButtonEventArgs e)
{
Print(GetSlotByX(e.GetPosition(ChartPanel as IInputElement).X));
}

or

public override void OnMouseDown(ChartControl chartControl, ChartPanel chartPanel, ChartScale chartScale, ChartAnchor dataPoint)
{
Print(GetSlotByX(dataPoint.GetPoint(chartControl, chartPanel, chartScale).X));
}

[keepsimple]

Thanks Chelsea,

will work with that, if I have additional questions, I will post back.

Regards

[keepsimple]

Hi Chelsea,

sorry, but cant get this to work, are you sure GetSlotByX is correct, cant find that in the help guide and when i insert the code it wont compile, get an error message:

The name 'GetSlotByX' does not exist in the current context

Regards

[NinjaTrader_ChelseaB]

Hello keepsimple,

I made a mistake with that. Should be GetSlotIndexByX().

http://ninjatrader.com/support/helpGuides/nt8/en-us/getslotindexbyx.htm?zoom_highlightsub=getslot

[keepsimple]

Sorry,
for bothering you again, but I am still getting the same error message.
I inserted the code in indicator code, am I missing something here?

Regards

[NinjaTrader_Matthew]

Sorry for the confusion, need to specify the ChartControl class:

ChartControl.GetSlotIndexByX(1);

[keepsimple]

Sorry cant get that working, could you please give me short snippet of code which capures the mouse clicked bar, and returns the barindex of that bar.

thanks

[NinjaTrader_Matthew]

Sorry cant get that working, could you please give me short snippet of code which capures the mouse clicked bar, and returns the barindex of that bar.

thanks

There was an issue in Beta 2 which prevented the mouse down left click event from being detected... the below will work in Beta 3 due out later this week. For now you can use the right click event which should work.

protected override void OnStateChange()
{
	if (State == State.SetDefaults)
	{
		Name	= "BarsData";				
		IsOverlay	= true;
	}			
	
	else if (State == State.Historical)
	{			
		// subscribe to chart panel mouse down event
		ChartPanel.MouseDown += OnMouseDown;
	}
	
	else if (State == State.Terminated)
	{
		ChartPanel.MouseDown -= OnMouseDown;	
	}			
}	

private void OnMouseDown(object sender, MouseButtonEventArgs e)
{
	// print the nearest slot index by the mouse down point.x
	Print(ChartControl.GetSlotIndexByX((int)ChartControl.MouseDownPoint.X));		
}

[keepsimple]

Thanks, will work with that, if I have any additional question, i will post back.

[keepsimple]

Hi Matthew,
I worked with the attached code, which does pretty much what I want, but there is still an issue, it compiles, but when I add the indicator to a chart I get the following error message: Error on calling "OnStateChange" method: Object reference not set to an instance of an object.

Regards

[NinjaTrader_Matthew]

That was a pretty dirty example, for completeness you should check if ChartPanel != null in both States.

	else if (State == State.Historical)
	{			
		// subscribe to chart panel mouse down event
            if(ChartPanel != null)
		ChartPanel.MouseDown += OnMouseDown;
	}
	
	else if (State == State.Terminated)
	{
            if(ChartPanel != null)
		ChartPanel.MouseDown -= OnMouseDown;	
	}

[keepsimple]

Thanks,
thought so, just wasnt sure.

Thanks