How to draw indicator from external source

[wintermelon]

Hello,

I have an external program that can output a data series / indicator values of the form

date/time, value of indicator
date/time, value of indicator
....
....

How do I get the indicator plotted on a pane in the form of a OHLC bar chart?

I am using a constant volume chart, so the time intervals are not uniform. The intervals between the timestamps may not be uniform also.

[NinjaTrader_JC]

Hello wintermelon,

There is no supported way for the API to access a NinjaTrader indicators to draw then on a chart.

Let me know if I can be of further assistance.

[wintermelon]

Hello,

Without using any API, I was thinking, is it possible to do it like so?

1) Have the external program output to a file in real-time
2) Have the ninjascript indicator read from the file
3) For each bar,
3a) determine the start and end times of the bar (or start to current time if the bar is the current bar)
3b) use the timestamps in the file to search for the indicator values in the file that are within the time of the bar
3c) plot those indicator values

I don't have enough experience in ninjascript development to know if the above will work.

If you can let me know if the above sounds feasible, or if there is some close enough sample, I can start working based on that.

[koganam]

Hello,

I have an external program that can output a data series / indicator values of the form

date/time, value of indicator
date/time, value of indicator
....
....

How do I get the indicator plotted on a pane in the form of a OHLC bar chart?

I am using a constant volume chart, so the time intervals are not uniform. The intervals between the timestamps may not be uniform also.

You will have to override the Plot() with a custom plot that uses DrawLine() to draw the bars using the OHLC data that you are creating.

[wintermelon]

Hi Koganam,

I see. I was hoping that it would be a simple matter of sending the values to Plot() and selecting a style (e.g. OHLC, candlesticks), but sounds like it wouldn't be that straightfoward.

Do you know of any indicators with source that does something similar that I can reference off a base?

Thanks.

[koganam]

Hi Koganam,

I see. I was hoping that it would be a simple matter of sending the values to Plot() and selecting a style (e.g. OHLC, candlesticks), but sounds like it wouldn't be that straightfoward.

I made an enhancement request for that some time back. I have no idea if or when it might be implemented.

ref: http://www.ninjatrader.com/support/f...tick+plot+ohlc

Come to think of it, I was never given a tracking number for the suggestion; just a "thank you" post, so they may have just ignored it. Who knows?

Do you know of any indicators with source that does something similar that I can reference off a base?

Thanks.

There is an indicator, http://www.ninjatrader.com/support/f...catid=4&id=512, which shows how to plot indicator data as candlesticks. I do not see one that does OHLC, but the idea should be easy to extend to plotting such.

[wintermelon]

Thanks Koganam, I'll go through it and see if I can hack something out =)