squaredDistanceTo method
- 
Point<T> other
Returns the squared distance between this and other.
Squared distances can be used for comparisons when the actual value is not required.
Implementation
T squaredDistanceTo(Point<T> other) {
  var dx = x - other.x;
  var dy = y - other.y;
  return (dx * dx + dy * dy) as T;
}
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    https://api.dart.dev/stable/2.13.0/dart-math/Point/squaredDistanceTo.html