hexWithAlpha function

String hexWithAlpha(
  1. String hex,
  2. double alpha
)

Appends alpha (0–1) to a hex colour as a two-digit uppercase suffix.

Implementation

String hexWithAlpha(String hex, double alpha) {
  final alphaHex = (alpha * 255)
      .round()
      .toRadixString(16)
      .padLeft(2, '0')
      .toUpperCase();
  return '$hex$alphaHex';
}