Do not be lost, it is very simple. 
I simply said that JoinStyle and CapStyle are fixed in TGX11 to the two values I mentionned before. They cannot be changed. Look at the code.
[quote=“couet”]What is done here is independant line segments. [/quote]Yes, but it seems to me it was the original issue
Ok Valeri, I think we should stop that tread here. Nothing else to add.