On Dec 11, 2013, at 4:17 PM, Dave Fernandes <dave.fernan...@utoronto.ca> wrote:
> Is there any way to zoom in just one dimension? Not really. You could put a counter transform before drawing that eliminates the opposite direction (and the aforementioned sample should show how to find out the current zoom level) but thats not really a satisfying solution... > > On Dec 11, 2013, at 6:05 PM, David Duncan <david.dun...@apple.com> wrote: > >> 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/dave.fernandes%40utoronto.ca >> >> This email sent to dave.fernan...@utoronto.ca -- 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
