how to read and understand 5axesgui.py ??

tiffany wrote:

anybody is familiar with .py language?

I am trying to learn it. Others here are already very proficient. The language is Python, and there are many online resources to learn it.
It is, allegedly, a fun language to program in.

especially about the funtions such as color() capture() collection()

These seem to be defined in Vismach.

5axisgui.py uses Python syntax, but nearly every function/operation/property/method used in the file is defined in vismach.py, and is imported near the beginning of 5axisgui.py.
The only dosumentation for vismach is this Wiki page wiki.linuxcnc.org/cgi-bin/wiki.pl?Vismach Which basically says that there is no documentation for Vismach.
There are some comments in the Vismach.py code, that give some hints as to what things do.

tiffany wrote:

if I could understand .py which can be used to show a simulation picture/GUI ?

Yes, that should be possible.

I could write my own .py for my machine? or is it necessary?

It is completely unnecessary. It is useful for trying out a new machine design, checking kinematics, that sort of thing, but if you have the actual machine in front of you, then the Vismach GUI doesn't help very much.

It would possibly be rather useful for checking G-code off-line, though.