From Converting from Window to View Coordinates:

'''Important: Cocoa event objects return y coordinate values that are 1-based instead of 0-based. Thus, a mouse click on the bottom left corner of a window or view would yield the point (0, 1) in Cocoa and not (0, 0). Only y-coordinates are 1-based.'''

So my question is: WTF? Why are y-coords 1 based? And why not x as well? Lazyweb, please enlighten me.

(Tip o' the hat to Jeff Johnson of Lap Cat Software for noticing this.)


Update: From Michael Jurewitz on Twitter: '''NSEvent y-coords are indeed 1-based. It's just a relic of the Display Postscript days'''

Thanks Michael!