draw rotate seems to be creating huge steps in the image, instead of having a smooth image, is there some option to change that ?

https://gyazo.com/47cd11c4ac4d0d9776423dec771f7d0d

you can see that the black line is jagged, all i used is regular drawRotate();

basic 2D don't have any anti-aliasing.

But you could try this:

make the image at top and bottom transparent (alpha=0) for a few pixel rows.

Thanks for the idea, i have added 2 pixels on each side of faded alpha (50%) and 2 pixels of alpha 0% and its smooth now

https://gyazo.com/ddbd2bf9abf33e00ca79e17cbae17975