Canvas elements have negative position values

[jksjaz]

As I'm unsure if this project is maintained, I'm posting this question here instead of on StackOverflow.

My question is why do elements in the work area have negative position values when the work area fixed size is changed and the elements are moved to the top left corner.

I thought that maybe we maybe consider positions X0 and Y0 as the center and anything to the left is regarded as a negative value but that doesn't seem to be the case.

Is there a specific reason for having values for position negative?