Flutter: checkerboard 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;
  var uv = Vector2(x / size.width, y / size.height);
  uv.y /= size.aspectRatio;

  var gridUv = frac2(uv * tiles);

  /// We have a square with top left and bottom right quarters
  /// painter with white and the rest being black.
  return (gridUv.x < .5 && gridUv.y < .5) || (gridUv.x > .5 && gridUv.y > .5)
    ? 0xffffffff
    : 0xff000000;
}