format method
Returns a formatted string representation of this vector.
x0 sets the default precision for all components; y0 overrides
the precision for the Y component.
Example: [ <x>, <y> ]
Implementation
String format([int x0 = 0, int? y0]) =>
'[ '
'${x.toStringAsFixed(x0)}, '
'${y.toStringAsFixed(y0 ?? x0)} '
']';