I think I've gotten on the right track. Two issues. One I needed to add the spread * pi to the height and width. That made a huge difference. Thank you for the direction it helped a lot. Given the time to fine tune it exactly I think i might finally have this. I kind of didn't really realize it but you are actually working in side of a circle because the shadow offsets from the center of the image. Anyway that realization made a lot of difference.
On Dec 22, 2009, at 8:28 AM, David Duncan wrote: > > On Dec 21, 2009, at 8:02 PM, Development wrote: > >> As near as I can tell, no matter what I do, the image itself, not accounting >> for the shadow, is drawn in the upper left corner. this causes a negative >> shadow, or one to the upper left, to be cut off by the edge of the context. >> I have attempted using drawAtPoint, and accounting for the negative shadow >> by moving the point an amount that should accommodate the shadow. It did not >> work. >> >> Now if the shadow is to the lower right, the adjustments I make work >> perfectly every time and the shadow is exactly what it should be. >> >> I think the point is that I do not understand the context drawing. I thought >> I did but it should be painfully obvious from this thread that I do not. > > > I highly suspect that your drawing is just fine, but since your not drawing > to a view, but extracting an image that you are assigning to a UIImageView, > your conditions are likely different from drawing to a typical view. A > UIImageView, by default, centers its content. This means that if you have a > UIImageView that is 20x20 in size, but you assign a 30x30 image to it, then > (unless clipToBounds=YES) the image will still be displayed at 30x30 centered > on the view. > > A plain UIView by default resizes its content. Normally this does not matter > because you don't set the contents of a UIView's layer. But it does mean that > you would typically resize the UIView in order to have it display more > content, and thus you would still avoid the issue. > > Overall, this is one of those situations where, as others have commented, you > need to figure out where things are going wrong before anyone can really help > you. There are lots of ways to debug this, but especially the simulator can > make this very convenient since it is much easier to get files off. Typically > when debugging offscreen drawing the standard approach is to dump images of > that drawing to disk periodically to see what is going on. In the simulator > you can easily just grab a PNG representation and drop it at the root of your > hard disk or home folder (whereas on hardware you have to put it in your > documents folder and then download it). Doing so would tell you if your > drawing is doing what you want and help you figure out where the actual > problem is. > -- > David Duncan > Apple DTS Animation and Printing > _______________________________________________ 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
