Flutter: fixed aspect ratio grid

main.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) {
  var tiles = 5.0;
  /// Compute uv in same way as in previous examples.
  var uv = Vector2(x / size.width, y / size.height);

  /// New twist, [Size.aspectRatio] is essentially [Size.width] 
  /// divided by [Size.height].
  /// uv.y /= 2 would make our tiles 2 times taller
  /// uv.y *= 2 would make tiles 2 times shorter
  /// uv.y /= size.aspectRatio would make them as many
  /// times taller or shorter as aspect ratio 
  /// between [Size.width] and [Size.height]
  uv.y /= size.aspectRatio;

  return toColorInt((frac2(uv * tiles)).xyx);
}