Improve "Tablet Coordinate" Mapping - Wobbly + Shaky Lines

[ForestHymn]

Hello Affinity Photo development team,

I'm not sure if this counts more as a bug report? Or as a feature request.

There is a problem with Affinity Photo free-hand brush lines. When drawing, zoomed out or even zoomed in to 100% - brush lines and pixel tool lines zig-zag. Even though my hand doesn't shake - the lines produced have zig-zags. This is not due to the brush shape, or the spacing. Any brush shape, or 1% spacing still produces the same problem. I am not experiencing this problem on other programs - like Photoshop, Corel Painter, etc. On these programs, freehand lines remain accurate (smooth).

The solution shouldn't be the stabilizer. The problem with the stabilizer - if you are a painter/artist - is that you want to paint quickly, with free-hand strokes. You don't want to paint with a line-trailing rope... The stabilizer is not good for artists. If your hands don't shake, you shouldn't need to use the stabilizer. 

 

Maybe the problem has to do with tablet coordinate mapping? Maybe there is something off in the mapping?

I've experienced this problem in another program. A Japanese program called "OpenCanvas" - which has 2 options for tablet mapping.

One is called "OS Coordinates" (which produces zig-zag lines)

The other option is "Tablet Coordinates" (this one works perfectly - lines are stable when zoomed out or zoomed in. Strokes are super smooth - with NO need for a stabilizer.

 

I've used a brand new 2019 Wacom Intuos Pro tablet, also used an Wacom Intuos Pro 3, and also a Wacom Cintiq 22HD. All tablets produce the same zig-zag lines. On other programs - strokes are very smooth.

Maybe this is something that others have seen too?

As a painter, this problem is a deal-breaker. But Affinity Photo is a fantastic program, with a great brush engine.

It seems like something that would really be worth fixing.. A critical fix for painters and artists who would like to use Affinity Photo.

Thank you immensely for viewing this issue and feature request.