distanceTo method

int distanceTo(Rect other)

Returns the distance between this Rect and other. This is minimum length that a corridor would have to be to go from one Rect to the other. If the two Rects are adjacent, returns zero. If they overlap, returns -1.

Implementation

int distanceTo(Rect other) {
  int vertical;
  if (top >= other.bottom) {
    vertical = top - other.bottom;
  } else if (bottom <= other.top) {
    vertical = other.top - bottom;
  } else {
    vertical = -1;
  }

  int horizontal;
  if (left >= other.right) {
    horizontal = left - other.right;
  } else if (right <= other.left) {
    horizontal = other.left - right;
  } else {
    horizontal = -1;
  }

  if (vertical == -1 && horizontal == -1) return -1;
  if (vertical == -1) return horizontal;
  if (horizontal == -1) return vertical;
  return horizontal + vertical;
}