Reference Frames in Documentation

[zoligyenge]

Hello, I was teachign reference frames to my kids and noticed soemthing I am not sure about:

Why is topside -X in the robot design on the right side? Shouldn't it be "X"?

https://docs.pybricks.com/en/latest/signaltypes.html#reference-frames

[laurensvalk]

The top side (the display) is facing opposite to the X direction, so -X.

Compare to the most basic example on the left, where the front (usb) is facing in the same direction as X, so +X.

[zoligyenge]

Thanks for the quick reply. Ok, I think I goz it now: So the deifition is: which axis is the top of the hub facing. Feel free to delete the thread as it was my misunderstanding