var len = 150;

var slen = 8.5;

var rules;

​

function setup() {

  createCanvas(1024, 1024);

  angle = radians(angles[4]);

  rules = rulesSet.slice(4,5);

  sentence = axioms[4];

  background(51);

  turtle();

  var button = createButton("Расти");

  button.position(300, 20);

  button.mousePressed(generate);

  saveButton = createButton("Сохранить");

  saveButton.position(300, 40);

  clearButton = createButton("Очистить");

  saveButton.mousePressed(saveSnowflake);

}

​

function saveSnowflake() {

  save('tree.png');

}

​

function turtle() {

  turtleTree();

  //turtleShadow();

}

​

function turtleTree() {

  background(51);

  resetMatrix();

  translate(width * 0.45, height * 0.85);

  fill(255, 25);

  noStroke();

  push();

  rotate(radians(65));

  ellipse(0, -8, 20, 30);

  pop();

  stroke(255, 100);

  for (var i = 0; i < sentence.length; i++) {

    var current = sentence.charAt(i);

​

    if (current == "F") {

      stroke(255, 100);

      line(0, 0, 0, -len);

      translate(0, -len);

    } else if (current == "+") {

      rotate(angle);

    } else if (current == "-") {

      rotate(-angle)

    } else if (current == "[") {

      push();

    } else if (current == "]") {

      fill(255, 70, 70, 100);

      ellipse(0, 0, 8, 8);

      pop();

    }

  }

}

​

function turtleShadow() {

  resetMatrix();

  translate(width * 0.45, height * 0.85);

  rotate(radians(70));

  stroke(255, 100);

  for (var i = 0; i < sentence.length; i++) {

    var current = sentence.charAt(i);

​

    if (current == "F") {

      stroke(255, 15);

      line(0, 0, 0, -slen);

      translate(0, -slen);

    } else if (current == "+") {

      rotate(angle);

    } else if (current == "-") {

      rotate(-angle)

    } else if (current == "[") {

      push();

    } else if (current == "]") {

      fill(255, 70, 70, 2);

      ellipse(0, 0, 8, 8);

      pop();

    }

  }

}

​

var rulesSet = [];

var axioms = [];

var angles = [];

​

axioms[0] = "F";

angles[0] = 30;

rulesSet[0] = {

  a: "F",

  b: "FF+[+F-F-F]-[-F+F+F]"

}

​

axioms[1] = "X";

angles[1] = 22.5;

rulesSet [1] = {

  a: "F",

  b: "FF"

}

rulesSet[1 + 1] = {

  a: "X",

  b: "F-[[X]+X]+F[+FX]-X"

}

​

axioms[3] = "F+F+F+F";

angles[3] = 90;

rulesSet [3] = {

  a: "F",

  b: "FF+F-F+F+FF"

}

​

axioms[4] = "F";

angles[4] = 22.5;

rulesSet [4] = {

  a: "F",

  b: "FF+[F+F-FF]-[-F+FF-F]"

}

​

axioms[5] = "F";

angles[5] = 27.5;

rulesSet[5] = {

  a: "F",

  b: "FFX+[F+FF-FX]-[-F+XF-F]"

}

rulesSet[5 + 1] = {

  a: "X",

  b: "-F+[FF-F+FF]"

}

​

function generate() {

  len *= 0.5;

  var nextSentence = "";

  for (var i = 0; i < sentence.length; i++) {

    var current = sentence.charAt(i);

    var found = false;

    for (var j = 0; j < rules.length; j++) {

      if (current == rules[j].a) {

        found = true;

        nextSentence += rules[j].b;

        break;

      }

    }

    if (!found) {

      nextSentence += current;

    }

  }

  sentence = nextSentence;

  turtle();

}

​