We don't need this method anymore so remove the prototype.

Signed-off-by: Blake Skinner <bskinner@mit.edu>
Minor tweaks to the frame calculation. Use the frame instead of the bounds and also don't do the center point calculation by hand, use Apple's CGRect function instead.

Signed-off-by: Blake Skinner <bskinner@mit.edu>
Replace the old method for calculating the transforms with one which will create a properly aligned image view for the marker instead. This also removes the dependency on having to know the screen coordinates.

Signed-off-by: Blake Skinner <bskinner@mit.edu>