On Mon, Jun 17, 2019 at 7:31 PM Tony V E <tvaneerd_at_[hidden]> wrote:

> I can only imagine that mouse/touch input needs to be in the same
> coordinate system as the drawing.
>

It almost never is at the device level. Although the higher level APIs
users are accustomed to do commonly transform to "drawing" coordinates.

-- 
-- Rene Rivera
-- Grafik - Don't Assume Anything
-- Robot Dreams - http://robot-dreams.net