Abstract Class Name: Linear Geometry

Superclass - <Primitive Geometry>

Subclasses

• <Arc>
• <Line>

Definition

An instance of a concrete class derived form this DRM class is a geometric linear representation.

Primary Page in DRM Diagram:

• 5

Secondary Pages in DRM Diagram:

• 13
• 23

Example

See individual subclasses for examples.

Constraints

• <<Publishable Object>>
• <<No Attribute Conflicts>>
• <<Non Crossing Aggregations>>
• <<Non Cyclic Aggregations>>
• <<Precedence of Property Set Index>>
• <<Colour Mapping Restrictions>>
• <<Continuous LOD Restrictions>>
• <<Image Mapping Functions and Texture Coordinates>>
• <<Nested Primitive Geometry>>
• <<Linear Geometry Structure>>

Associated with (two-way)

• zero or more {ordered} <Geometry Edge> instances, each with a <Edge Directions> link object

Composed of (two-way) (inherited)

• zero or one <Classification Data> instance
• zero or more {ordered} <Property Set Index> instances
• zero or more <Property Table> instances
• zero or more <Property Table Reference> instances
• zero or more <Property Value> instances
• zero or more <Colour> instances
• zero or more {ordered} <Image Mapping Function> instances
• zero or one <Light Rendering Properties> instance
• zero or one <Presentation Domain> instance
• zero or one <Rendering Priority Level> instance
• zero or one <Rendering Properties> instance
• zero or more <Tack Point> instances
• zero or one <Union Of Primitive Geometry> instance (notes)

Composed of (two-way metadata) (inherited)

• zero or one <Time Constraints Data> instance

Component of (two-way) (inherited)

• zero or more <Union Of Primitive Geometry> instances

Inherited Field Elements

Field Elements

Notes

Composed of Notes

Union_Of_Primitive_Geometry

 A <Primitive Geometry> instance contains a
 <Union Of Primitive Geometry> instance as a component only
 when that <Primitive Geometry> instance can be decomposed
 into nested <Primitive Geometry> instances, as (for
 example) a <Polygon> instance can be decomposed into
 subfaces.

Fields Notes

count

 A value of zero (0) for the count field indicates that the given
 <Linear Geometry> instance is to be rendered as solid.

 Otherwise, the interpretation of the count depends on whether
 a <Light Rendering Properties> component is present for
 the given <Linear Geometry> instance.

 - If a <Light Rendering Properties> component is present, then
   count is the number of evenly spaced light points to be
   rendered along the <Linear Geometry>.

 - If no <Light Rendering Properties> component is present, then
   count is the number of evenly spaced line segments to be
   rendered along the <Linear Geometry>.

suppress_last

 If count is greater than zero, the suppress_last field specifies
 whether the last segment / point in the sequence is suppressed
 or rendered.