sclass Stripes implements MakesBufferedImage {
  int w, h;
  double angle; // radians
  new L<Color> colors;
  new DoubleList positionsInDirection;
  new <DoublePt> pixelPositions;
  
  public BufferedImage getBufferedImage() {
    var img = newBufferedImage(w, h, first(colors));
    var g = graphics(img);
    translateGraphics(g, w*.5, h*.5);
    rotateGraphicsClockwise_radians(g, angle);
    double bigNumber = (w+h)*2;
    int n = numberOfStripes();
    for (int i = 0; i < n; i++) {
      double x1 = positionsInDirection.get(i);
      double x2 = getOr(positionsInDirection, i+1, bigNumber);
      Color color1 = or(cyclicGet(colors, i), Color.black);
      Color color2 = or(cyclicGet(colors, i+1), Color.white);
      g2.setPaint(new GradientPaint(x1, 0, color1, x2, 0, color2));
      // TODO: Line2D.Double (full precision)
      g.fillPolygon(g, ll(pt_iround(x1, -bigNumber), pt_iround(x2, -bigNumber),
        pt_iround(x2, bigNumber), pt_iRound(x1, bigNumber)),);
    }
    ret img;
  }
  
  int numberOfStripes() { ret l(positionsInDirection)+1; }
}