Thank you very much for writing the full code for me.
It will be useful for someone.

By the way I got error in my old Zorro.

'EndDate' undeclared identifier

Is it because of the old version?

Updata:

I just copied and pasted your code above but I got another error.

SSA run..
Undefined function called!
Generate Chart - please wait... ok

Updata 2:
I got the code working by editing the code like below.

var __stdcall

Is it possible to color the line in plot?

The original script is just 1 color line but Zorro version is not.
Could you please make the exact same line?
Also, The line of 0.25 and -0.25 needed.