import com.leapmotion.leap.Gesture.State; //导入依赖的package包/类
private void printGestureDetails(Gesture gesture, Controller controller) {
    switch (gesture.type()) {
        case TYPE_CIRCLE:
            CircleGesture circle = new CircleGesture(gesture);

            // Calculate clock direction using the angle between circle normal and pointable
            String clockwise;
            if (circle.pointable().direction().angleTo(circle.normal()) <= Math.PI / 4) {
                // Clockwise if angle is less than 90 degrees
                clockwise = "clockwise";
            } else {
                clockwise = "counterclockwise";
            }

            // Calculate angle swept since last frame
            double sweptAngle = 0;
            if (circle.state() != State.STATE_START) {
                CircleGesture previousUpdate =
                        new CircleGesture(controller.frame(1).gesture(circle.id()));
                sweptAngle = (circle.progress() - previousUpdate.progress()) * 2 * Math.PI;
            }

            logger.debug("Circle id: " + circle.id() + ", " + circle.state() + ", progress: "
                    + circle.progress() + ", radius: " + circle.radius() + ", angle: "
                    + Math.toDegrees(sweptAngle) + ", " + clockwise);
            break;
        case TYPE_SWIPE:
            SwipeGesture swipe = new SwipeGesture(gesture);
            logger.debug("Swipe id: " + swipe.id() + ", " + swipe.state() + ", position: "
                    + swipe.position() + ", direction: " + swipe.direction() + ", speed: " + swipe.speed());
            break;
        case TYPE_SCREEN_TAP:
            ScreenTapGesture screenTap = new ScreenTapGesture(gesture);
            logger.debug("Screen Tap id: " + screenTap.id() + ", " + screenTap.state()
                    + ", position: " + screenTap.position() + ", direction: " + screenTap.direction());
            break;
        case TYPE_KEY_TAP:
            KeyTapGesture keyTap = new KeyTapGesture(gesture);
            logger.debug("Key Tap id: " + keyTap.id() + ", " + keyTap.state() + ", position: "
                    + keyTap.position() + ", direction: " + keyTap.direction());
            break;
        default:
            logger.debug("Unknown gesture type.");
            break;
    }
}