How do I make my free drawing event work on angled drawing canvas?

This is the event i am using to draw freely on drawing canvas however it doesn't work properly if drawing canvas is not at 0 angle. Can someone help me in updating it, so it works at any angle of drawing canvas?

c3 file:- 1drv.ms/u/s!ApOn-Ur_sXD7gR-9qtzsgO9CS8Fg

It's not a solution, but a workaround - you can rotate the layer with the drawing canvas:

dropbox.com/s/ib0czvps4c0hfnh/drawSmoothing.c3p

I like dops idea better. Much cleaner.

I’m not able to open your project right now but I’m assuming the canvas’ origin is centered. This will give an xy that can be directly used to draw to the canvas. No need to subtract the bboxtop and such.

Tx = (touch.x-canvas.x)*cos(-canvas.angle) - (touch.y-canvas.y)*sin(-canvas.angle) - canvas.width/2

Ty = (touch.x-canvas.x)*sin(-canvas.angle) + (touch.y-canvas.y)*cos(-canvas.angle) -canvas.height/2