Thanks for pointing this out. I’ve added the equivalent overload to Objo:
AddArc(x As Double, y As Double, radius As Double, startRadian As Double, endRadian As Double, counterClockwise As Boolean)
Pass True to draw counter-clockwise or False to draw clockwise:
path.AddArc(100, 100, 50, 0, Maths.PI / 2, True)
The existing five-parameter version remains available and draws clockwise. This improvement will be included in the next release: https://feedback.objo.dev/feature/1333