Dart function to fit a rectangle represented by a point

fit_within.dart

/// Calculates the size of a rectangle that fits within the confines of another
/// rectangle the size of the dimensions described by [outer] with the same
/// aspect ratio as the rectangle described by [inner].
Point fitWithin(Point inner, Point outer) {
  final double outerRatio = outer.x/outer.y;
  final double innerRatio = inner.x/ inner.y;

  if(outerRatio<innerRatio) {
    final num  x = outer.x;
    final num  y = inner.y * (outer.x/inner.x);
    return new Point(x,y);
  } else if(outerRatio>innerRatio) {
    final num  y = outer.y;
    final num  x = inner.x * (outer.y/inner.y);
    return new Point(x,y);
  } else {
    return new Point(outer.x, outer.y);
  }
}