Implementing a horizontal compass on the iPhone - algorithm?
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by Andrew Johnson
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Published on 2010-03-27T01:47:54Z
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2010/03/27
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A horizontal compass looks something like this if you are facing due East (90 degrees).
85----90---95
If you were facing due 355 degrees northwest, it would look like this:
350----355---0
As you turn the compass, the number should cycle from 0 -> 360 -> 0
So, my question is, how would you implement a view like this on the iPhone? I had a couple of ideas:
Make one long image with all numbers and tick marks, and shift it left/right when the compass heading changes
Create pieces of the view as tiles and append them when the compass heading changes.
Create a line of tick marks that shifts with the compass heading, and just write numbers on it as needed.
How would you attack this problem? Im mainly looking for algorithmic advice, but if you ave code or pseudo-code to demonstrate, that would be helpful too.
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