On Jun 27, 2011, at 1:26 PM, Raleigh Ledet wrote: > Cocoa coordinates are all 0,0 based. If you have a reproducible test case > that says otherwise, please file a radar and attach it. > > -raleigh > > > On Jun 25, 2011, at 7:59 AM, Richard Somers wrote: > >> The Cocoa Drawing Guide states "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." >> >> Why are the y-coordianate values of Cocoa event objects 1-based? >> >> Do most developers simply subtract 1.0 from the y-coordianate value obtained >> from an event object to make it 0-based before using the x-y-coordinate val
I think the OP misunderstood the document. Although Cocoa coordinates are 0-based, the 0 point on the Y axis of the screen is just beyond the bottom of the screen. That is, if you click at the bottom of the screen, the Y coordinate will be 1. 0 is still a valid Y coordinate. I'm not aware that programmers make any overall adjustments of coordinates for this. They just remember that the bottommost clickable Y coordinate is 0. -- Bill Cheeseman - [email protected] _______________________________________________ Cocoa-dev mailing list ([email protected]) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [email protected]
