Geom2

Current Version

2

Subtype of

Serializable

Fields

Entity/Object	Variable	Description
integer		Version.
integer		Object type: 0 for a point object, 1 for a curve object, 2 for a solid object, and -1 for a mixed object.
Boolean		1 if void regions are labeled; 0 otherwise.
double		Relative geometry tolerance.
double		Relative resolution tolerance.
integer	nv	Number of vertices.
VertexData[nv]	vertex	Matrix of vertex data.
integer	ne	Number of edges.
EdgeData[ne]	edge	Matrix of edge data.
integer	nc	Number of curves.
integer	na	Number of attributes.
Attribute[na]		Attributes. The Attribute type is undocumented because it is only used internally.

In the table above, the entity types are defined as follows:

VertexData

Entity/Object	Variable	Description
double[2]		Coordinates of the vertex.
int		The domain number if the vertex is isolated. If the vertex is not isolated this value is unspecified.
double		Relative tolerance of the vertex.

EdgeData

Entity/Object	Variable	Description
int[2]		Start and end vertex of the edge, respectively (1-based).
double[2]		Parameter values of the two vertices.
int[2]		The left and right domain number of the edge, respectively.
int		Signed index of the underlying curve (1-based). The sign indicates the direction of the edge relative the curve.
double		Relative tolerance of the edge.

Description

The Geom2 type represents a geometry object in 2D that is not an assembly and is not virtual. The geometry object must not be self-intersecting.

Example

A straight line in 2D:

# Major & minor version

0 1

1 # number of tags

# Tags

3 ls1

1 # number of types

# Types

3 obj

 

# --------- Object 0 ----------

 

0 0 1

5 Geom2 # class

2 # version

1 # type

1 # voidsLabeled

1e-10 # gtol

0.0001 # resTol

 

2 # number of vertices

# Vertices

# X Y dom tol

0 0 -1 NAN

1 1.5 -1 NAN

 

1 # number of edges

# Edges

# vtx1 vtx2 s1 s2 up down curve tol

1 2 0 1 0 0 1 NAN

 

1 # number of curves

# Curves

 

# Curve 1

11 BezierCurve # class

1 # version

2 # sdim

0 # rational?

1 # degree

# homogeneous control points

0 0

1 1.5

# Attributes

0 # nof attributes