Abstract Class Name: Linear Geometry

Superclass - <Primitive Geometry>

Subclasses

• <Arc>
• <Line>

Definition

This DRM class is a conceptual grouping of geometric linear representations.

Primary Page in DRM Diagram:

• 5

Secondary Pages in DRM Diagram:

Example

See individual subclasses for examples.

Constraints

• <<No Attribute Conflicts>>
• <<Non Crossing Aggregations>>
• <<Non Cyclic Aggregations>>
• <<Precedence of Attribute 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 through <Edge Directions>

Composed of (two-way)(inherited)

• zero or more {ordered} <Attribute Set Index> instances
• zero or one <Classification Data> instance
• 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)

• one or more <Union Of Primitive Geometry> instances

Inherited Field Elements

Field Elements

Notes

Composed of Notes

Union_Of_Primitive_Geometry

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

Fields Notes

count

 A value of zero (0) 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>.

suppressLast

 If count is greater than zero, this flag indicates whether the
 last segment / point in the sequence is suppressed or rendered.