alt Hacker NewsCool concept!
I noticed with the Aquarelle brush on iOS, if you swipe fast, you can clearly see the polling rate of the touch events on the canvas. The line looks smooth so I guess you already have an interpolation algorithm going, but this brush darkens as the dwell time is longer so I’m not sure if it’s doubling the points that are reported or what but it looks very bandy/patchy.
Thanks for catching that, went and updated some parts of the engine for touch handling there. It's a bit better, although had to find a bit of compromise. Appreciate it!