Processing - 10 - lineとforを使った描画(>>>の連続)

void setup () {
  size (600, 400);
  smooth ();
  background (255);
  strokeWeight (25);
  noLoop ();
}

void draw () {
  for (int i = 1; i < 9; i = i + 1) {
    stroke (20*i, 155, 155);
    line(i*50, 100, 150 + (i-1)*50, 200);
    line(i*50 + 100, 200, 50 + (i-1)*50, 300);
  }
}