StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PODetect iPhone screen orientation
primarykey
Id
999686
data
AcceptedAnswerId
999899
AnswerCount
2
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2009-06-16T05:13:26.133
FavoriteCount
6
LastActivityDate
2010-02-15T04:44:48.147
LastEditDate
2010-02-15T04:44:48.147
LastEditorUserId
116994
OwnerUserId
116994
ParentId
0
PostTypeId
1
Score
5
ViewCount
6517
LastEditorDisplayName
text
Body
I'm wanting to detect the orientation of the iPhone at 45 degree increments. Ideally I'd like to be able to get the angle of orientation along any axis. The detection I need to do is similar to how Trism for the iPhone flashes an arrow towards the current bottom position of the screen when orientation changes. I have something coded up but really don't understand how the accelerometer readings work and could use a nudge in the right direction. My current code logs the current angle but even when the phone is flat I get readings varying wildly a few times a second. <pre><code>- (void) checkOrientation:(UIAccelerometer*)accelerometer didAccelerate:(UIAcceleration*)acceleration { int accelerationX = acceleration.x * kfilteringFactor + accelerationX * (1.0 - kfilteringFactor); int accelerationY = acceleration.y * kfilteringFactor + accelerationY * (1.0 - kfilteringFactor); float currentRawReading = (atan2(accelerationY, accelerationX)) * 180/M_PI; NSLog(@"Angle: %f",currentRawReading); } </code></pre> Sample from log while phone is flat: <pre><code>2009-06-16 17:29:07.987 [373:207] Angle: 0.162292 2009-06-16 17:29:07.994 [373:207] Angle: 179.838547 2009-06-16 17:29:08.014 [373:207] Angle: 179.836182 2009-06-16 17:29:08.032 [373:207] Angle: -90.000000 2009-06-16 17:29:08.046 [373:207] Angle: 179.890900 2009-06-16 17:29:08.059 [373:207] Angle: -90.000000 2009-06-16 17:29:08.074 [373:207] Angle: 179.917908 2009-06-16 17:29:08.088 [373:207] Angle: -179.950424 2009-06-16 17:29:08.106 [373:207] Angle: 90.000000 2009-06-16 17:29:08.119 [373:207] Angle: 90.000000 2009-06-16 17:29:08.134 [373:207] Angle: -179.720245 </code></pre>
Tags
<iphone><orientation><accelerometer>
Title
Detect iPhone screen orientation
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USSimon
UserOwnerUserId
1. USSimon
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
2. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
3. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
2. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 PODetect iPhone screen orientation
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
2. VO
 singulars
 PostPostId
 PODetect iPhone screen orientation
 UserUserId
 USMike
 VoteTypeVoteTypeId
 VTFavorite
3. VO
 singulars
 PostPostId
 PODetect iPhone screen orientation
 UserUserId
 USNeo42
 VoteTypeVoteTypeId
 VTFavorite
CommentsPostId
1. This table or related slice is empty.

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.