code: func (l *Line) String() string {
  	return fmt.Sprintf("LINESTRING(%g %g,%g %g)", l.a[0], l.a[1], l.b[0], l.b[1])
  }
docs: // String returns a string representation of the line.
  // The format is WKT, e.g. LINESTRING(30 10,10 30)