this.x = 0;

  this.y = 0;

  this.xspeed = 1;

  this.yspeed = 0;

  this.total = 0;

  this.tail = [];

​

  this.dir = function(x, y) {

    this.xspeed = x;

    this.yspeed = y;

  };

​

  this.eat = function(pos) {

    var d = dist(this.x, this.y, pos.x, pos.y);

    if (d < 1) {

      this.total++;

      return true;

    } else {

      return false;

    }

  };

  this.death = function() {

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

      var pos = this.tail[i];

      var d = dist(this.x, this.y, pos.x, pos.y);

      if (d < 1) {

        this.total = 0;

        this.tail = [];

      }

    }

  };

​

  this.update = function() {

    for (var i = 0; i < this.tail.length - 1; i++) {

      this.tail[i] = this.tail[i + 1]

    }

    this.tail[this.total - 1] = createVector(this.x, this.y);

    this.x = this.x + this.xspeed * scl;

    this.y = this.y + this.yspeed * scl;

​

    this.x = constrain(this.x, 0, width - scl);

    this.y = constrain(this.y, 0, height - scl);

  };

​

  this.show = function() {

    fill(0, 255, 0);

    for (var i = 0; i < this.total; i++) {

      rect(this.tail[i].x, this.tail[i].y, scl, scl);

    }

    rect(this.x, this.y, scl, scl);

  };

}