int level = 3;
int scale = 12;

String twist = "slllsllr";
int[][] directions = {{1, 1},{-1, 1},{-1, -1},{1, -1}};
String instructions;
int point = 0;
int direction = 0;
int x = 1;
int y = 1;

void setup () {
  framerate(20);
  size(326, 326);
  instructions = recurse("s", level);
  println("length: " + sqrt(instructions.length() - 1));
}

String recurse(String s, int levels) {
  String result = "";
  for(int i = 0; i < s.length(); i++) {
    result += s.charAt(i) + twist;
  }
  if (--levels > 0) {
    result = recurse(result, levels);
  }
  
  return(result);
}

void draw() {
  color(0);
  if (point == 0) {
    background(255);
    println(x + " x " + y);
    x = 1;
    y = 1;
    direction = 0;
  }
  char c = instructions.charAt(point);
  if (c == 'l') {
    direction--;
  }
  else if (c == 'r') {
    direction++;
  }
  if (direction < 0) {
    direction += 4;
  }
  int newx = x + directions[direction % 4][0] * scale;
  int newy = y + directions[direction % 4][1] * scale;
  line(x, y, newx, newy);
  x = newx;
  y = newy;
  point++;
  point %= instructions.length();
}