Question

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:

1. Make one long image with all numbers
   and tick marks, and shift it
   left/right when the compass heading
   changes

2. Create pieces of the view as tiles
   and append them when the compass
   heading changes.

3. 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.

Answer 1

Option one is the easiest. Keep in mind that you can composite part of an image to deal with the wrap-around.