class LSystem {
  String axiom;
  String computedWord;
  String[][] rules = {{"F", "F-F++F-F"}};
  float size, angle;
  LSystem(float size, float angle) {
    this.size = size;
    this.angle = angle;
    axiom = "F";
    computedWord = axiom;
  }
   
  void iterate (int iterations) {
    String tempWord;
    println("starting word: " +computedWord);
    for(int i=0; i<iterations; i++) {
      tempWord = computedWord;
      computedWord = tempWord.replaceAll(rules[0][0],rules[0][1]);
      println("iteration " + i +": " +computedWord);
    }
  }
  void drawLSystem(Turtle t) {
 char c;
    for (int i=0; i<computedWord.length(); i++) {
      c = computedWord.charAt(i);
      if (c == 'F')
        t.forward(size);
      else if (c == '+')
        t.right(angle);
      else if (c == '-')
        t.left(angle);
    }
  }
}