code: function calcBezierAtT(p, t) {
      var x = (1-t)*(1-t)*(1-t)*p[0].x + 3*(1-t)*(1-t)*t*p[1].x + 3*(1-t)*t*t*p[2].x + t*t*t*p[3].x;
      var y = (1-t)*(1-t)*(1-t)*p[0].y + 3*(1-t)*(1-t)*t*p[1].y + 3*(1-t)*t*t*p[2].y + t*t*t*p[3].y;
      return new Point(x, y);
  }
docs: Calculate Bezier at T
  
  @param {number} p
  @param {number} t
  
  @returns {void}