+ {
+ int rot = current_device_rotation();
+ int swap;
+ while (rot <= -180) rot += 360;
+ while (rot > 180) rot -= 360;
+ if (rot > 135 || rot < -135) /* 180 */
+ dx = -dx, dy = -dy;
+ else if (rot > 45) /* 90 */
+ swap = dx, dx = -dy, dy = swap;
+ else if (rot < -45) /* 270 */
+ swap = dx, dx = dy, dy = -swap;
+ }
+