default Pair<Integer, Integer> getRotatedBitmapDimensions(float angleInDegree) {
            final Bitmap bm = getRotatedBitmap(angleInDegree);
            return bm == null ? null : new Pair<>(bm.getWidth(), bm.getHeight());
        }
Gets the dimensions (width + height) in pixels of the rotated bitmap. used to calculated touching
main/src/main/java/cgeo/geocaching/models/geoitem/GeoIcon.java