DXF definition of an AutoCAD vertex entity. More...

#include <vertex.h>

Collaboration diagram for dxf_vertex_struct:

Data Fields
int	id_code
char *	linetype
char *	layer
double	elevation
double	thickness
double	linetype_scale
int16_t	visibility
int	color
int	paperspace
char *	dictionary_owner_soft
char *	dictionary_owner_hard
double	x0
double	y0
double	z0
double	start_width
double	end_width
double	bulge
double	curve_fit_tangent_direction
int	flag
int	polyface_mesh_vertex_index_1
int	polyface_mesh_vertex_index_2
int	polyface_mesh_vertex_index_3
int	polyface_mesh_vertex_index_4
struct DxfVertex *	next

Detailed Description

DXF definition of an AutoCAD vertex entity.

Every VERTEX that is part of a polyface mesh has the 128 bit set in its Vertex flags (70) group.
If the entity specifies the coordinates of a VERTEX of the mesh, the 64 bit is set as well and the 10, 20, and 30 groups give the vertex coordinates.
The VERTEX indexes are determined by the order in which the VERTEX entities appear within the POLYLINE, with the first numbered 1.

If the VERTEX defines a face of the mesh, its VERTEX flags (70) group has the 128 bit set but not the 64 bit.
The 10, 20, and 30 (location) groups of the FACE entity are irrelevant and are always written as zero in a DXF file.
The VERTEX indexes that define the mesh are given by 71, 72, 73, and 74 groups, the values of which are integers specifying one of the previously defined vertices by index.
If the index is negative, the edge that begins with that VERTEX is invisible.
The first zero VERTEX marks the end of the vertices of the face.
Since the 71 through 74 groups are optional fields with default values of zero, they are present in DXF only if nonzero.

Version:: According to DXF R10.; According to DXF R11.; According to DXF R12.; According to DXF R13.; According to DXF R14.

Definition at line 78 of file vertex.h.

Field Documentation

int dxf_vertex_struct::id_code

Identification number for the entity.
This is to be an unique (sequential) number in the DXF file.
Group code = 5.

Definition at line 83 of file vertex.h.

Referenced by dxf_donut_write(), dxf_vertex_init(), dxf_vertex_read(), and dxf_vertex_write().

char* dxf_vertex_struct::linetype

The linetype of the entity.
Defaults to BYLAYER if ommitted in the DXF file.
Group code = 6.

Definition at line 88 of file vertex.h.

Referenced by dxf_donut_write(), dxf_vertex_free(), dxf_vertex_init(), dxf_vertex_read(), and dxf_vertex_write().

char* dxf_vertex_struct::layer

Layer on which the entity is drawn.
Defaults to layer "0" if no valid layername is given.
Group code = 8.

Definition at line 92 of file vertex.h.

Referenced by dxf_donut_write(), dxf_vertex_free(), dxf_vertex_init(), dxf_vertex_read(), and dxf_vertex_write().

double dxf_vertex_struct::elevation

Elevation of the arc in the local Z-direction.
Defaults to 0.0 if omitted in the DXF file, or prior to DXF version R12, or DXF_FLATLAND equals 0 (default).
Group code = 38.

Definition at line 96 of file vertex.h.

Referenced by dxf_vertex_init(), dxf_vertex_read(), and dxf_vertex_write().

double dxf_vertex_struct::thickness

Thickness of the arc in the local Z-direction.
Defaults to 0.0 if ommitted in the DXF file.
Group code = 39.

Definition at line 101 of file vertex.h.

Referenced by dxf_donut_write(), dxf_vertex_init(), dxf_vertex_read(), and dxf_vertex_write().

double dxf_vertex_struct::linetype_scale

Linetype scale (optional).
Group code = 48.

Definition at line 105 of file vertex.h.

Referenced by dxf_vertex_init(), dxf_vertex_read(), and dxf_vertex_write().

int16_t dxf_vertex_struct::visibility

Object visibility (optional):

Visible
Invisible

Group code = 60.

Definition at line 108 of file vertex.h.

Referenced by dxf_vertex_init(), dxf_vertex_read(), and dxf_vertex_write().

int dxf_vertex_struct::color

Color of the entity.
Defaults to BYLAYER if ommitted in the DXF file.
Note that entities encapsulated in a block with the color BYBLOCK are represented in the "native" color of the BLOCK entity.
Group code = 62.

Definition at line 115 of file vertex.h.

Referenced by dxf_donut_write(), dxf_vertex_init(), dxf_vertex_read(), and dxf_vertex_write().

int dxf_vertex_struct::paperspace

Entities are to be drawn on either PAPERSPACE or MODELSPACE.
Optional, defaults to DXF_MODELSPACE (0).
Group code = 67.

Definition at line 122 of file vertex.h.

Referenced by dxf_donut_write(), dxf_vertex_init(), dxf_vertex_read(), and dxf_vertex_write().

char* dxf_vertex_struct::dictionary_owner_soft

Soft-pointer ID/handle to owner dictionary (optional).
Group code = 330.

Definition at line 127 of file vertex.h.

Referenced by dxf_vertex_free(), dxf_vertex_init(), dxf_vertex_read(), and dxf_vertex_write().

char* dxf_vertex_struct::dictionary_owner_hard

Hard owner ID/handle to owner dictionary (optional).
Group code = 360.

Definition at line 130 of file vertex.h.

Referenced by dxf_vertex_free(), dxf_vertex_init(), dxf_vertex_read(), and dxf_vertex_write().

double dxf_vertex_struct::x0

X value of the location point.
Group code = 10.

Definition at line 134 of file vertex.h.

Referenced by dxf_donut_write(), dxf_lwpolyline_read(), dxf_lwpolyline_write(), dxf_vertex_init(), dxf_vertex_read(), and dxf_vertex_write().

double dxf_vertex_struct::y0

Y value of the location point.
Group code = 20.

Definition at line 137 of file vertex.h.

Referenced by dxf_donut_write(), dxf_lwpolyline_read(), dxf_lwpolyline_write(), dxf_vertex_init(), dxf_vertex_read(), and dxf_vertex_write().

double dxf_vertex_struct::z0

Z value of the location point.
Group code = 30.

Definition at line 140 of file vertex.h.

Referenced by dxf_donut_write(), dxf_vertex_init(), dxf_vertex_read(), and dxf_vertex_write().

double dxf_vertex_struct::start_width

Starting width (optional, defaults to 0.0).
Group code = 40.

Definition at line 143 of file vertex.h.

Referenced by dxf_donut_write(), dxf_lwpolyline_read(), dxf_lwpolyline_write(), dxf_vertex_init(), dxf_vertex_read(), and dxf_vertex_write().

double dxf_vertex_struct::end_width

Ending width (optional, defaults to 0.0).
Group code = 41.

Definition at line 146 of file vertex.h.

Referenced by dxf_donut_write(), dxf_lwpolyline_read(), dxf_lwpolyline_write(), dxf_vertex_init(), dxf_vertex_read(), and dxf_vertex_write().

double dxf_vertex_struct::bulge

Bulge (optional, defaults to 0.0).
The bulge is the tangent of 1/4 the included angle for an arc segment, made negative if the arc goes clockwise from the start point to the endpoint; a bulge of 0 indicates a straight segment, and a bulge of 1 is a semicircle.
Group code = 42.

Definition at line 149 of file vertex.h.

Referenced by dxf_donut_write(), dxf_lwpolyline_read(), dxf_lwpolyline_write(), dxf_vertex_init(), dxf_vertex_read(), and dxf_vertex_write().

double dxf_vertex_struct::curve_fit_tangent_direction

Curve fit tangent direction.
Group code = 50.

Definition at line 156 of file vertex.h.

Referenced by dxf_donut_write(), dxf_vertex_init(), dxf_vertex_read(), and dxf_vertex_write().

int dxf_vertex_struct::flag

Flag (optional, defaults to 0)
Bit coded:

Extra vertex created by curve-fitting.
Curve-fit tangent defined for this vertex.
A curve-fit tangent direction of 0 may be omitted from the DXF output, but is significant if this bit is set.
Unused (never set in DXF files).
Spline vertex created by spline-fitting.
Spline frame control point.
3D Polyline vertex.
3D polygon mesh vertex.
Polyface mesh vertex.

Group code = 70.

Definition at line 159 of file vertex.h.

Referenced by dxf_donut_write(), dxf_vertex_init(), dxf_vertex_read(), and dxf_vertex_write().

int dxf_vertex_struct::polyface_mesh_vertex_index_1

Polyface mesh vertex index.
Optional.
Present only if nonzero.
Group code = 71.

Definition at line 177 of file vertex.h.

Referenced by dxf_vertex_read(), and dxf_vertex_write().

int dxf_vertex_struct::polyface_mesh_vertex_index_2

Polyface mesh vertex index.
Optional.
Present only if nonzero.
Group code = 72.

Definition at line 182 of file vertex.h.

Referenced by dxf_vertex_read(), and dxf_vertex_write().

int dxf_vertex_struct::polyface_mesh_vertex_index_3