Take a look into this collection of ideas at Enhancement for Graphics #1702
At the moment there is nothing built in, but it's pretty easy to do by creating a polyline for the arc segment you want and passing that into fillPoly/drawPoly
Waiting for my bangle, I've created some special charts.
Thanks to MaBe I know its working on Bangle.
Inside PIE and other charts, there is a Q&U solution for arc used.
Its my pleisure :-)
Is it possible to have an ability to draw or fill an arc for espruino devices with display (BangleJS/PixelJs).
A native method with parameters : Start Angle, Sweep Angle, X, Y coordinate and radius.
Espruino already have native functions for circle and ellipse that can be use to draw an arc. Just a thought!!