opacity method

ColorFilterGenerator opacity(
  1. double value
)

Create new filter from this filter with given opacity

Implementation

ColorFilterGenerator opacity(double value) {
  return ColorFilterGenerator(
    name: name,
    filters: <List<double>>[
      ...filters,
      <double>[
        value,
        0,
        0,
        0,
        0,
        0,
        value,
        0,
        0,
        0,
        0,
        0,
        value,
        0,
        0,
        0,
        0,
        0,
        1,
        0,
      ],
    ],
  );
}