this.begin = start;

  this.end = end;

  this.show = function(){

    stroke(255);

    line(this.begin.x, this.begin.y,this.end.x,this.end.y);

  }

  this.branchA = function(){

    var dir = p5.Vector.sub(this.end,this.begin);

    dir.rotate(PI/4);

    dir.mult(0.67);

    var newEnd = p5.Vector.add(this.end, dir);

    var right = new Branch(this.end, newEnd)

    return right;

  }

  this.branchB = function(){

    var dir = p5.Vector.sub(this.end,this.begin);

    dir.rotate(-PI/4);

    dir.mult(0.67);

    var newEnd = p5.Vector.add(this.end, dir);

    var right = new Branch(this.end, newEnd)

    return right;

  }

}