Yes, you right, but I expected what I need to move text to the zero point, rotate it and move it back. But NSAffineTransform works quite the contrary and requires to move the zero point to the text and then back. That was a big surprise for me.
On Thu, Aug 7, 2008 at 12:55 AM, Kyle Sluder <[EMAIL PROTECTED]> wrote: > On Wed, Aug 6, 2008 at 4:37 PM, Vitaly Ovchinnikov > <[EMAIL PROTECTED]> wrote: >> Yes, he right. I've just tested it and it works fine. >> I though that -translateXBy:yBy: will move my object, but it moved >> pivot point... This is hard, especially with revesed OY axis ;) > > Well, it all happens in one transformation matrix. If I recall matrix > math correctly (probably not), rotation is a linear transformation, > but translation isn't, so in order to get rotation to work right the > pivot point must be the origin. Since you want to rotate the object > around its center, you need to translate it twice. This is all > chained together in one transformation matrix, so when the > multiplication's done the net result is one matrix that does all three > operations. > > Anyone, please feel free to correct me, I would very much appreciate > any clarification. :D > > --Kyle Sluder > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) 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]
