Making OnEachTick and OnbarClose coexist

[bicou]

I want to develop an indicator that is based on tick by tick. I understood how tick by tick works and IsFirstTickOfBar which allows to detect the new candle of the timeframe.
The close[1] then represents the last tick of the previous bar, Close[2] the one that precedes it etc.
My problem is that I also want to calculate the Williams R% of the previous bar calculated on the close.
How to do it? Should I create variables that I initialize for each new bar to keep the highest and lowest of the bar and then manually calculate the R% or can I add a series but then how to feed and use it ?
Thank you for your advice and possibly examples.

[NinjaTrader_ChelseaB]

Hello bicou,

When IsFirstTickOfBar is true, call the indicator and use an index of [1] on the plot.

WilliamsR(ISeries<double> input, int period)[int barsAgo]

https://developer.ninjatrader.com/docs/desktop/williams_r

if (IsFirstTickOfBar)
{
Print(string.Format("{0} | Time[1]: {1}, WilliamsR(20)[1]: {2}", Time[0], Time[1], WilliamsR(20)[1]));
}