I'm trying to move a thin cylinder on the y_axis so it will connect 2
points
p1 and p2; I first translate by e.g. p2.x-p1.x, etc. (which seems to
yield a valid result) and then I try to rotate using the direction

Dear Friends,
I have one question about closing windows produced by mainFrame. In the
following codes, windows "normal frame1" and "normal frame2" produced
by JFrame can be closed without stopping the whole program, but when I