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POandroid compass rotateanimation
 

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    <p>I'm making a compass that points to a user defined location. I'm using the rotateanimation to rotate the needle. When the needle points in the direction of the phone I know the phone is pointing in the direction I want. However, I wanted the needle to point in the correct direction irregardless of the phone's azimuth.</p> <p>The problem is that it seems that rotateanimation does not rotate the needle according to the real world coordinates, and instead is relative to the phone's screen. So a 58 degree rotation of the needle does not match a 58 degree rotation in the real world. Is this true or am I making a mistake in my code?</p> <p>The compass is meant to be used by placing the phone's back flat on a surface. I've also tried outputting the azimuth and it reads like this:</p> <pre><code>Azimuth Actual Phone angle 0 0 45 90 90 180 </code></pre> <p>when it gets close to a full circle back it bounces between 120 and 340.</p> <p>Here's the code:</p> <pre><code>direction = 360 - azimuth + rotate; RotateAnimation animate = new RotateAnimation(rotateLast, direction, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); animate.setFillAfter(true); animate.setInterpolator(new LinearInterpolator()); animate.setDuration(10); needle.startAnimation(animate); rotateLast = direction; </code></pre> <p>azimuth is the phone's azimuth from the sensor, rotate is the user specified direction (in degrees from north), and direction is the required rotation of the needle.</p> <p>rotateLast is the last position the needle was at, I'm using this because without it the needle reverts to zero degrees and flickers.</p> <p>Thanks, P.S. this has been driving me crazy</p>
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