Ninja Trader / Zenfire / Mirus Display Update Interval 0.1

September 18th, 2010, 02:20 PM

aslan

The trick is to force NT to replot when you get a tick.
...

Fantastic, at least another step!!! Thank you very much for your code advice.

I like to use pricelineWH (https://forum.ninjatrader.com/local_links.php?action=ratelink&linkid=364&catid=4&lpage=1) indicator which only plots a line for last price, I think it would be great to put your suggestion in this indicator to test, I�ll try it as I�ve no knowledge to code a complete indicator.

September 18th, 2010, 06:27 PM

RJay

Being a volume nut, I have looked for a way to force updates with changes in volume.

Will this patch work in the OnMarketData section as well??

Yes and no. Yes, calling the given code will cause a refresh. No, because bars are not updated yet (OnMarketData is called before OnBarUpdate). So if you intention is to update based on the bars, you are out of luck, but if you had a custom plot method that was plotting a text item or placing a line based on some other internal var that was updated in OnMarketData, that would work. Hopefully, I am conveying the concept.

Not sure what you mean by volume. The volume updates with each call to OnBarUpdate, so not sure why you need OnMarketData for that. Perhaps you mean the bid/ask sizes.

September 21st, 2010, 07:12 PM

aslan

The trick is to force NT to replot when you get a tick. This is a dangerous item if you don't know what you are doing, as you could start using way more CPU to do this. This trick only needs to be in ONE indcator. At the end of the OnBarUpdate() method, add the following:

Code

if (ChartControl != null)
    if (ChartControl.ChartPanel != null)
        ChartControl.ChartPanel.Invalidate();

This code will force the chart to refresh on each tick, so user beware. Your initial comment, that CPU will be fine if you manage the number of charts/indicators is spot on. To be sure you only do this in one indicator, you could have an indicator, that just refreshes the screen, but I have not tried that.

Note: This will do nothing for the DOM update interval.

This is my first indicator and I simply added your 3 lines into standard ninja script indicator file, will this work? (did it just now and markets are calm and I cannot see any higher cpu usage so I�m wondering if I�m right).

September 21st, 2010, 09:47 PM

The code needs to go in the OnBarUpdate() method, not Initialize(). Also, make sure CalcOnClose is set to false, or it will only be called at the end of the bar.

Also, if there is nothing going on, you are not going to notice any difference. This code will make little or no difference for 99% of indicators. The NT update interval of .1 s is essentially 10 frames per sec, which is not real fast, but when you think about what you need to see on a chart and how fast you can interpret the info, it is generally fast enough. There are a few indicators (i.e. level2) which do benefit from this code, but you will incur the extra CPU cycles of doing extra screen updates.

The reason people get in trouble, is they think they need all of their charts/indicators to update every tick. This just is not the case.

October 18th, 2010, 05:32 PM

There is another issue see here: Maximum frequency of updates to OnMarketData/Depth No3 - [AUTOLINK]NinjaTrader[/AUTOLINK] Support Forum
(Also posted here

The Truth: NinjaTrader

I think this issue is relevant and should be known:
Maximum frequency of updates to OnMarketData/Depth No3 - NinjaTrader Support Forum (

, I don�t want to spam the board but for me it�s very important that there comes pressure to Zenfire to deliver what they promise: unfiltered ... therefore I make several posts).
As mentioned before in other threads as I�m no programmer I can only believe when I�m told that I receive complete tape an no fragments. We�ll se what they answer, I asked already Mirus to check about, they told me they ask Zenfire techs - would be great if other could give information, too.

Ninja Trader / Zenfire / Mirus Display Update Interval 0.1

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Ninja Trader / Zenfire / Mirus Display Update Interval 0.1