I would like to plot inside the boxes created by the Box chart style.

Is there any (undocumented) hook ?

humy65 

I would like to plot inside the boxes created by the Box chart style. Is there any (undocumented) hook ?

You can do this with an indicator that uses a custom plot.

Fat Tails 

You can do this with an indicator that uses a custom plot.

How do I determine the rectangle (the BOX) of the current bar to paint inside ?

humy65 

How do I determine the rectangle (the BOX) of the current bar to paint inside ?

You need to determine x and y coordinates of the box within the chart. x values are plotted from the left to the right, y values are plotted from top to bottom.

left x-coordinate: midpoint of bar - 0.5 bar width
right x-coordinate: midpoint of bar + 0.5 bar width
upper end of the box: y-coordinate corresponding to bar high
lower end of the box: y-coordinate corresponding to bar low

These are the NinjaScript commands that you can use:

bar midpoint: ChartControl.GetXByBarIdx(BarsArray[0], idx)
bar width: Bars.BarsData.ChartStyle.BarWidth
bar high: ChartControl.GetYByValue(this, High.Get(idx))
bar low: ChartControl.GetYByValue(this, Low.Get(idx))

where idx is the index of the bar.

Happy! Made it work.

Thanks much.