On Dec 11, 2013, at 8:05 AM, Jeffrey Oleander <jgo...@yahoo.com> wrote:
> * (The posted snippet from sample code was as clear as mud to me. Why powers > of 4 (and -4) instead of 5 when we're talking about 5 levels of detail? > 1/(2^2) - 2^2 = (1/4) - 4 means "...levelsOfDetail" should be set to 5?!? It > needs more words, more context.) The base level of detail is a zoom level of 2^0 (1 level of detail only allows for a single representation like that). Each additional level of detail is a zoom level half that size smaller (thus a 2nd level if 2^-1x or 1/2x, then 2^-2x or 1/4x, etc). The bias adds to the base level’s exponent, thus a bias of 2 means the base level if 2^2x (4x) zoom instead of 2^0x zoom. There are no powers of 4, (or 5 or any other except for 2). The level of detail is range of the exponent, not the base. -- David Duncan _______________________________________________ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
