How to transfer an indicator to another

[Johnny90]

Hi,
is it possible to transfer an indicator to one another? I want to pass an interface wich contains an custom indicator. Doing that via parameter shows error when saving the indicator.

Background:
I want to separate filter and signal logic. the signal indicator should get an interface wich contains a flag or a enum when the filter indicator indicates long or short trading.
Is this possible and how would i do that?

Ich tried to do this like that and it seems to work but the filter indicator don't change its state. I guess the update mechanism isn't working like that:

FilterIndicator = KillZonesFilter(0);
SignalIndicator = LiquidityVoid(1);
SignalIndicator.Filter = FilterIndicator;

In the signal indicator:

private ITrendFilter _filter;
public ITrendFilter Filter
{
get
{
Update();
return _filter;
}

set
{
_filter = value;
}
}

The Problem in the indicator. The filter doesn't get updated anymore...

protected override void OnBarUpdate()
{

if(Filter != null)
{
//Filter don't update anymore..
Filter.Update();
if (Filter.TradingModus == TradingMode.Long)
{
DetermineLongLiqidityGap();
}
else if (Filter.TradingModus == TradingMode.Short)
{
DetermineShortLiquidityGap();
}

return;
}

[NinjaTrader_ChelseaB]

Hello Johnny90,

From the code you have posted, it appears that the _filter variable is of the type ITrendFilter which would be the only object type that can be assigned to that variable.
This would mean that any indicator cannot be assigned as only an ITrendFilter class can be assigned.

I would recommend contacting the original author to see if modifications can be made to accept any indicator class instead of only ITrendFilter.

[Johnny90]

Hi ChelseaB,
thanks for the quick response. I've updated the post to make it more clear. I can pass the indicator fine, but it doesen't seem to update anymore. Logic is correct and gets triggered when debugging the filter indicator but the signal indicator don't gets updated as well.

[NinjaTrader_ChelseaB]

Hello Johnny90,

Calling an indicator in OnBarUpdate() should cause it to update OnBarUpdate() internally.

If the values called are not plots, added with AddPlot(), then the indicator would need to call Update() to update.
<IndicatorName>.Update().

https://ninjatrader.com/support/helpGuides/nt8/update.htm

I would recommend contacting the author or distributor of the script to inquire how the script should be called from a host.

[Johnny90]

Hello ChelseaB,
thanks. The .Update did the trick.

Best regards,
Johnny