boolean function ( ) { return startPoint == null ; }
checks whether subpath is empty or not . concode_field_sep Point startPoint concode_elem_sep List<IShape> segments concode_elem_sep boolean closed concode_field_sep Point getStartPoint concode_elem_sep boolean isSinglePointOpen concode_elem_sep void addSegment concode_elem_sep boolean isDegenerate concode_elem_sep boolean isClosed concode_elem_sep boolean isSinglePointClosed concode_elem_sep List<Point> getPiecewiseLinearApproximation concode_elem_sep void setStartPoint concode_elem_sep void setStartPoint concode_elem_sep Point getLastPoint concode_elem_sep void setClosed concode_elem_sep List<IShape> getSegments