The SEDRIS Data Representation Model
APPENDIX A - Classes
Geometry Edge

Class Name: Geometry Edge

Superclass - <Geometry Topology>

Subclasses

This DRM class is concrete and has no subclasses.

Definition

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

A <Geometry Edge> is used to represent the location of a segment of

  1. one or more <Linear Geometry> instances,
  2. a boundary of one or more <Geometry Face> instances, or
  3. both.

Primary Page in DRM Diagram:

Secondary Pages in DRM Diagram:

Example

  1. A <Line> instance that represents the lighting of a runway may consist of many <Geometry Edge> instances.

FAQs

No FAQs supplied.

Constraints

Associated with (two-way)

Component of (two-way) (inherited)

Inherited Field Elements

This class has no inherited field elements.

Notes

Associated with Notes


Geometry_Face

 If present, these are the <Geometry Face> instances (if any exist)
 that are bordered by the given <Geometry Edge> instance, ordered
 counterclockwise when looking along the <Geometry Edge>.

 The converse of this relationship is that between
 <Geometry Face Ring> and <Geometry Edge>.

Geometry_Node

 This association specifies that the given <Geometry Edge> instance
 is "bounded by" these <Geometry Node> instances.

 The first <Geometry Node> is the starting node of
 the given <Geometry Edge>, while the second <Geometry Node>
 is the ending node.

Geometry_Volume

 The <Geometry Volume> that contains the <Geometry Edge>,
 if any.
Prev: Geometric Centre. Next: Geometry Face. Up:Index.

Last updated: July 16, 2004 Copyright © 2004 SEDRIS™