Create a Indicator - Based on existing code

I want to get an indicator that makes a box around the current price in a box

so looking back 60 minutes I want to have a box drawn around the Highest and Lowest price

and each new bar the price is redrawn by adding the latest bar and taking one bar off the back end.

there is an indicator called Session Box

https://ctdn.com/algos/indicators/show/1386

which has the basis of the code needed, just needs to be tweaked

and Its only showing 1  box  which is constantly evolving  based on the look back period in Minutes

thanks

Stuart R.

+61 410 518 678 (Sydney, Australia)