code: function(direction, length) {
          direction *= Math.PI / 180;
          var dx = length * Math.cos(direction);
          var dy = length * Math.sin(direction);
          this.insertDeltaXY(dx, dy);
      }
docs: Method: insertDirectionLength
  Insert a point in the current sketch given a direction and a length.
  
  Parameters:
  direction - {Number} Degrees clockwise from the positive x-axis.
  length - {Number} Distance from the previously drawn point.