Drawing an arc fill inside an image
I'm not sure what the best way to tackle this is... so I thought I'd ask here. I have an image with a circular button inside of it. I'd like to dynamically fill this button in an arc to show progress much like how when you are on iTunes Store on an iOS and its playing the preview its animating filling the circle in a sweep of an arc. Mine doesn't need to animate however. So I have the image, and I suppose I can draw that image to a context and then draw an arc on that image, and then make another image out of it. That seems like it would get slow if I needed to do that a lot. Any suggestions? I also wouldn't mind any links that might show similar code. This is for iOS. I tried searching Google, but my GoogleFu is not showing anything, probably due to me not using the right terms. Thanks in advance.___ 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
Re: Drawing an arc fill inside an image
On May 26, 2011, at 11:21 AM, Alex Kac wrote: So I have the image, and I suppose I can draw that image to a context and then draw an arc on that image, and then make another image out of it. That seems like it would get slow if I needed to do that a lot. No need to make a new image. Just draw directly into the original one: [image lockFocus]; …draw stuff… [image unlockFocus]; —Jens smime.p7s Description: S/MIME cryptographic signature ___ 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
Re: Drawing an arc fill inside an image
Custom view that sits on top of a UIImageView? Implement -drawRect: and a progress property and you're done. On May 26, 2011, at 11:21 AM, Alex Kac wrote: I'm not sure what the best way to tackle this is... so I thought I'd ask here. I have an image with a circular button inside of it. I'd like to dynamically fill this button in an arc to show progress much like how when you are on iTunes Store on an iOS and its playing the preview its animating filling the circle in a sweep of an arc. Mine doesn't need to animate however. So I have the image, and I suppose I can draw that image to a context and then draw an arc on that image, and then make another image out of it. That seems like it would get slow if I needed to do that a lot. Any suggestions? I also wouldn't mind any links that might show similar code. This is for iOS. I tried searching Google, but my GoogleFu is not showing anything, probably due to me not using the right terms. ___ 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
Re: Drawing an arc fill inside an image
The OP wants a solution for iOS. lock/unlockFocus only exist in NSView, not UIView. FWIW, I think you (that is, the OP) should start with the simplest solution available (e.g. Steve's suggestion), test performance, and only optimize if needed. Don't try to optimize if it's not actually required! -- Conrad Shultz www.synthetiqsolutions.com On May 26, 2011, at 11:40, Jens Alfke j...@mooseyard.com wrote: [image lockFocus]; …draw stuff… [image unlockFocus]; ___ 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
Re: Drawing an arc fill inside an image
Sure, I get the idea of only optimizing if needed. That said, experience (15 years) tells me very strongly that if I know that X will be slow and Y will be fast and either way works properly, I'd probably choose Y. So I prefer to stand on the shoulders of giants where possible. I've got a working solution - thanks guys! On May 26, 2011, at 2:46 PM, Conrad Shultz wrote: The OP wants a solution for iOS. lock/unlockFocus only exist in NSView, not UIView. FWIW, I think you (that is, the OP) should start with the simplest solution available (e.g. Steve's suggestion), test performance, and only optimize if needed. Don't try to optimize if it's not actually required! -- Conrad Shultz www.synthetiqsolutions.com On May 26, 2011, at 11:40, Jens Alfke j...@mooseyard.com wrote: [image lockFocus]; …draw stuff… [image unlockFocus]; Alex Kac - President and Founder Web Information Solutions, Inc. Patience is the companion of wisdom. --Anonymous ___ 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
