Boundary Path Data (DXF)

The boundary of each hatch object is defined by a path (or loop) that consists of one or more segments. Path segment data varies depending on the entity type (or types) that make up the path. Each path segment is defined by its own set of group codes.

Hatch boundary path data group codes
Group code	Description
92	Boundary path type flag (bit coded): 0 = Default 1 = External 2 = Polyline 4 = Derived 8 = Textbox 16 = Outermost
varies	Polyline boundary type data (only if boundary = polyline). See Polyline boundary data table below
93	Number of edges in this boundary path (only if boundary is not a polyline)
72	Edge type (only if boundary is not a polyline): 1 = Line 2 = Circular arc 3 = Elliptic arc 4 = Spline
varies	Edge type data (only if boundary is not a polyline). See appropriate Edge data table below
97	Number of source boundary objects
330	Reference to source boundary objects (multiple entries)

Polyline boundary data group codes
Group code	Description
72	Has bulge flag
73	Is closed flag
93	Number of polyline vertices
10	Vertex location (in OCS) DXF: X value; APP: 2D point (multiple entries)
20	DXF: Y value of vertex location (in OCS) (multiple entries)
42	Bulge (optional, default = 0)

Line edge data group codes
Group code	Description
10	Start point (in OCS) DXF: X value; APP: 2D point
20	DXF: Y value of start point (in OCS)
11	Endpoint (in OCS) DXF: X value; APP: 2D point
21	DXF: Y value of endpoint (in OCS)

Arc edge data group codes
Group code	Description
10	Center point (in OCS) DXF: X value; APP: 2D point
20	DXF: Y value of center point (in OCS)
40	Radius
50	Start angle
51	End angle
73	Is counterclockwise flag

Ellipse edge data group codes
Group code	Description
10	Center point (in OCS) DXF: X value; APP: 2D point
20	DXF: Y value of center point (in OCS)
11	Endpoint of major axis relative to center point (in OCS) DXF: X value; APP: 2D point
21	DXF: Y value of endpoint of major axis (in OCS)
40	Length of minor axis (percentage of major axis length)
50	Start angle
51	End angle
73	Is counterclockwise flag

Spline edge data group codes
Group code	Description
94	Degree
73	Rational
74	Periodic
95	Number of knots
96	Number of control points
40	Knot values (multiple entries)
10	Control point (in OCS) DXF: X value; APP: 2D point
20	DXF: Y value of control point (in OCS)
42	Weights (optional, default = 1)
97	Number of fit data
11	Fit datum (in OCS) DXF: X value; APP: 2D point
21	DXF: Y value of fit datum (in OCS)
12	Start tangent DXF: X value; APP: 2D vector
22	DXF: Y value of start tangent (in OCS)
13	End tangent DXF: X value; APP: 2D vector
23	DXF: Y value of end tangent (in OCS)