Flutter: texture generator, uv coordinate space

main.dart

/// Very useful package which is part of Flutter.
/// Also contains a useful functions, such as [mix] and [smoothStep].
import 'package:vector_math/vector_math.dart';

/// ...

/// Main area of interest, this function will
/// return color for each particular color on our [ui.Image]
int generatePixel(int x, int y, Size size) {
  /// Compute unified vector, values of its components
  /// will be between 0 and 1
  var uv = Vector2(x / size.width, y / size.height);

  /// Mapping unified vector values 
  /// to color range of 0..255
  return Color.fromRGBO(
    (uv.x * 255).toInt(),
    0,
    (uv.y * 255).toInt(),
    1.0,
  ).value;
}