interpolateNumberList<T extends num> function Value interpolation

List<T> Function(num) interpolateNumberList<T extends num>(List<T> a, List<T> b)

Returns an interpolator between the two list of numbers a and b.

Internally, an list template is created that is the same type and length as b. For each element in b, if there exists a corresponding element in a, the values are directly interpolated in the list template. If there is no such element, the static value from b is copied. The updated list template is then returned.

Note: For performance reasons, no defensive copy is made of the template list and the arguments a and b; modifications of these lists may affect subsequent evaluation of the interpolator.

Implementation

List<T> Function(num) interpolateNumberList<T extends num>(
    List<T> a, List<T> b) {
  var n = min(b.length, a.length),
      l = (b is List<int>
          ? _interpolateToInt
          : b is List<double>
              ? _interpolateToDouble
              : interpolateNumber) as T Function(num) Function(num, num),
      x = List<T Function(num)>.generate(n, (i) => l(a[i], b[i])),
      c = b.sublist(0),
      i = 0;

  return (t) {
    for (i = 0; i < n; ++i) {
      c[i] = x[i](t);
    }
    return c;
  };
}