Curve

spatialware_type: spatialware_curve

Features with this value represent smoothly curving lines defined by a list of points with optional start-tangent and end-tangent parameters to give more control over the shape of the line. The geometry on these features specify the list of points. Curve features have the following special attributes associated with them.

Attribute Name	Contents
spatialware_rotation	The rotation of the feature. The rotation is measured in degrees counterclockwise up from the horizontal.
spatialware_start_tangent	The start-tangent of the curve.
spatialware_end_tangent	The end-tangent of the curve.
spatialware_centroid_x	The feature’s centroid X location.
spatialware_centroid_y	The feature’s centroid Y location.
spatialware_centroid_z	The feature’s centroid Z location.
spatialware_is_closed	YES if the feature is closed. NO if otherwise.
spatialware_curve_type	A curve can be one of the four possible types as listed below. Corresponding values for each possible type are: 1 – ST_PolylineType 2 – ST_CircularArcType 3 – ST_PiecewiseBezierType 4 – HG_CurveType
spatialware_curve_direction	Direction of the curve. Corresponding values for each possible type are: 0 – reversed 1 – forward 2 – none
spatialware_curve_tangent. tangent_type	Curve tangent type. Corresponding values for each possible type are: 0 – HG_TangentNone 1 – HG_TangentStart 2 – HG_TangentEnd 3 – HG_TangentStartEnd
spatialware_curve_tangent. start.x spatialware_curve_tangent. start.y spatialware_curve_tangent. start.z	Coordinate of start tangent
spatialware_curve_tangent. end.x spatialware_curve_tangent. end.y spatialware_curve_tangent. end.z	Coordinate of end tangent

Features of this type are only used by the writer for reasons of convenience. When read, they come out as stroked linear features tagged with spatialware_type of spatialware_line.