I'm probably teaching my grandmother to suck eggs by suggesting this. Have you looked at using CGLayers?
Kevin On 10 Dec 2013, at 10:08, Graham Cox <graham....@bigpond.com> wrote: > > On 10 Dec 2013, at 10:52 am, Mike Abdullah <mabdul...@karelia.com> wrote: > >> Another option to consider is using CAShapeLayer to render individual >> objects where reasonable. This should allow Core Animation to efficiently >> render such vectors without a dedicated backing store. > > > CAShapeLayers really don’t scale much at all before OpenGL falls over. > Consider a simple shape with a bounds of about 100 x 100 points. At my > maximum zoom level that becomes 2,500,000 points in terms of the screen. Of > course, the vast majority is clipped and does not represent any actual > pixels, but seemingly the CA system doesn’t know that and such a size can’t > be set. In practical terms the most zoom I could reliably get from > CAShapeLayer was about 4x. > > The other problem is that CA.. anything must live in a view. My vector data > model doesn’t really care about views. The same model can be rendered into > multiple views if you want. At the very top level, a view’s drawRect: method > calls into the model to tell it to draw a region into a context - much like > CALayers - but the model is otherwise self-contained. While Apple claim CA > *is* a model, it’s one firmly welded to a single view somewhere. > Architecturally, CA doesn’t fit. Where it might be useful is to manage > backing store issues at the top, view level. So possibly CATileLayer may > help, but I can’t see CAShapeLayer practically fitting in anywhere. My > reading of the CA system may be wrong, but again I’m constrained by what > documentation there is, which is only barely adequate. > > —Graham > > > _______________________________________________ > > 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/ktam%40yvs.eu.com > > This email sent to k...@yvs.eu.com _______________________________________________ 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
