Table 6.88 — DRM_Geometry_Edge

Property

Description

Class
  • <DRM Geometry Edge>

Superclass

Subclass
  • None.

Definition

An instance of this DRM class is a one-dimensional <DRM Geometry Topology> instance consisting of an ordered collection of <DRM Location> instances connecting one <DRM Geometry Node> instance to another <DRM Geometry Node> instance. The orientation of a <DRM Geometry Edge> instance is defined by the order of its <DRM Location> components, taken in conjunction with its starting <DRM Geometry Node> instance and ending <DRM Geometry Node> instance.

A <DRM Geometry Edge> instance is used to represent the location of a segment of one or more <DRM Linear Geometry> instances and/or a boundary of one or more <DRM Geometry Face> instances.

Class diagram

Figure 6.107 — DRM_Geometry_Edge

Inherited field elements

Field name

Range

Field data type

None

    

Field elements

Field name

Range

Field data type

None

    

Default field values

Default field values for DRM_Geometry_Edge

Associated to (one-way) (inherited)
  • None.

Associated to (one-way)
  • None.

Associated by (one-way) (inherited)
  • None.

Associated by (one-way)
  • None.

Associated with (two-way) (inherited)
  • None.

Associated with (two-way)

Composed of (two-way) (inherited)
  • None.

Composed of (two-way)
  • None.

Composed of (two-way metadata) (inherited)
  • None.

Composed of (two-way metadata)
  • None.

Component of (two-way) (inherited)

Component of (two-way)
  • None.

Constraints

Clarifications

1If present, these <DRM Geometry Face> instances (if any exist) are those bordered by the <DRM Geometry Edge> instance, ordered counterclockwise when looking along the <DRM Geometry Edge> instance. The converse of this relationship is that between <DRM Geometry Face> instances and <DRM Geometry Edge> instances.

2This association specifies that the <DRM Geometry Edge> instance is bounded by these <DRM Geometry Node> instances. The first <DRM Geometry Node> instance is the starting node of the <DRM Geometry Edge> instance, while the second <DRM Geometry Node> instance is the ending node.

3These <DRM Geometry Volume> instances are those that contain the <DRM Geometry Edge> instance.

Example(s)

  • A <DRM Line> instance that represents the lighting of a runway consists of two <DRM Geometry Edge> instances, representing the lights on each side of the runway.