When making a polygon by xpoly for example, can we set transparency effect
as the following polygon?
No, AFAIK it is not properly possible.
There is just the gcf().pixel_drawing_mode property,
but it's a global one for the whole figure,
and it is not easy to manage. This way is rather a hack.
I understand that scilab has the ability to draw transparent polygon any
But changing of pixel_drawing_mode property affect already existent way of
drawing, we have to be careful when doing.
Especially when changing of pixel_drawing_mode property two or more times.