One Issue I'm having that I forgot to mention is that when I zoom in, the gesture recogniser on the objects ceases to recognise my attempts to drag and the scrollview drags instead - I have to zoom back out to near to 1:1 before I cant start dragging the objects again.
On 30/05/2011, at 21:55 , Brian Bruinewoud wrote: > Hi all, > > I'm about to start writing an app (Target is iPad running 4.3 or later) but > I've gotten to a position where I'm not sure of the best way to proceed with > the architecture. I thought I'd better ask now before I paint myself into a > corner. > > The parts of the app with which I am having trouble will be similar to a > basic vector graphic or CAD program. The user will be able to add objects to > the document/screen from a palette and then move these objects around and > edit them in various ways. Most documents will have around 25 objects; 50 > would be a large number. The objects will exist in a document level > coordinate system which should be mapped to the view coordinate system. When > the user does a pinch gesture, the objects will change in size but, at the > end of the gesture, they should all be redrawn at the new size so that they > look neat and so as to adjust the amount of details displayed within them. > Finally, when the iPad is rotated I would like to keep graphical aspects of > the document un-rotated but rotate the UI and any text on the document. > > So, given the above, I'm wondering how to represent the objects. Currently I > just have them as subviews within the main view (which is a UIView within a > UIScrollView) and I can drag them around (thanks to a gesture recogniser > attached to each object's view) and I can pinch to zoom (thanks to the Scroll > View). I haven't worked out how to do the level of detail stuff, though I > read that CATiledLayer might be of assistance, but then I don't think that > doesn't play well with the UIView-per-object architecture I currently have. > The views seem to give me a fair bit of functionality - hit testing, > animation, gesture recognition (of which I'll need more than the current drag > around) - but I haven't worked out how to do the nice zoom-and-redraw stuff. > > Other issues I'm having (in the Simulator): > > Sometimes the scrolling of the scrollview doesn't happen and then randomly > starts happening. Sometimes it starts happening even though I haven't zoomed; > Sometimes it doesn't even though I have zoomed. There are no gesture > recognisers on the larger views that might be interfering and I'm not > accidentally touching the object views. > > I would have liked to use the transformation property of the main view to map > the object view's coordinates to the UIViews coordinates. It seems like it > should work but I've had no success with this and in my small > proof-of-concept that I did I just resorted to direct manipulation of the > coordinates. > > I haven't started with the rotation thing yet so I don't know if that will > confuse me. > > Anyway, I would like comments/suggestions. Is the view-per-object approach > reasonable and can you suggest solutions to my zooming-level-of-detail and > other issues? Or should I do the whole thing in one view and do manual hit > testing and dragging etc? > > Thanks, > Brian._______________________________________________ > > 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/brian%40darknova.com > > This email sent to br...@darknova.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: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
