interval property

@override List<int> interval

range: 0 - 100, when only have one element,represents the same interval

Implementation

@override
List<int> get interval => [
      0,
      2,
      4,
      6,
      8,
      10,
      12,
      14,
      16,
      18,
      20,
      22,
      24,
      26,
      28,
      30,
      32,
      34,
      36,
      38,
      40,
      100
    ];