Always adjust event location to the middle of two fingers when two-finger dragging in TouchExplorer

    // pointers so they can be considered moving in the same direction.

    private static final float MAX_DRAGGING_ANGLE_COS = 0.525321989f; // cos(pi/4)

    // The minimal distance before we take the middle of the distance between

    // the two dragging pointers as opposed to use the location of the primary one.

    private static final int MIN_POINTER_DISTANCE_TO_USE_MIDDLE_LOCATION_DIP = 200;

    // The timeout after which we are no longer trying to detect a gesture.

    private static final int EXIT_GESTURE_DETECTION_TIMEOUT = 2000;

    // Helper to detect gestures.

    private final AccessibilityGestureDetector mGestureDetector;

    // The scaled minimal distance before we take the middle of the distance between

    // the two dragging pointers as opposed to use the location of the primary one.

    private final int mScaledMinPointerDistanceToUseMiddleLocation;

    // Helper class to track received pointers.

    private final TouchState.ReceivedPointerTracker mReceivedPointerTracker;

        } else {

            mGestureDetector = detector;

        }

        final float density = context.getResources().getDisplayMetrics().density;

        mScaledMinPointerDistanceToUseMiddleLocation =

            (int) (MIN_POINTER_DISTANCE_TO_USE_MIDDLE_LOCATION_DIP * density);

    }

    @Override

                    } break;

                    case 2: {

                        if (isDraggingGesture(event)) {

                            // Adjust event location to the middle location of the two pointers.

                            final float firstPtrX = event.getX(0);

                            final float firstPtrY = event.getY(0);

                            final float secondPtrX = event.getX(1);

                            final float secondPtrY = event.getY(1);

                            final int pointerIndex = event.findPointerIndex(mDraggingPointerId);

                            final float deltaX =

                                    (pointerIndex == 0) ? (secondPtrX - firstPtrX)

                            final float deltaY =

                                    (pointerIndex == 0) ? (secondPtrY - firstPtrY)

                                            : (firstPtrY - secondPtrY);

                            final double distance = Math.hypot(deltaX, deltaY);

                            if (distance > mScaledMinPointerDistanceToUseMiddleLocation) {

                            event.offsetLocation(deltaX / 2, deltaY / 2);

                            }

                            // If still dragging send a drag event.

                            sendMotionEvent(event, MotionEvent.ACTION_MOVE, pointerIdBits,

                                    policyFlags);

                + ", mLongPressingPointerId: " + mLongPressingPointerId

                + ", mLongPressingPointerDeltaX: " + mLongPressingPointerDeltaX

                + ", mLongPressingPointerDeltaY: " + mLongPressingPointerDeltaY

                + ", mScaledMinPointerDistanceToUseMiddleLocation: "

                + mScaledMinPointerDistanceToUseMiddleLocation

                + ", mTempPoint: " + mTempPoint

                + " }";

    }