The SEDRIS Data Representation Model
APPENDIX A - Classes
Light Source Control Link

Class Name: Light Source Control Link

Superclass - <Control Link>

Subclasses

This DRM class is concrete and has no subclasses.

Definition

An instance of this DRM class specifies an <Expression>, the value of which determines the active_light_value of all target <Light Source> objects - that is, which determines whether those <Light Source> instances are on or off.

Primary Page in DRM Diagram:

Secondary Pages in DRM Diagram:

Example

  1. A <Model> of a lighthouse has a <Geometry Model> with a <Union Of Geometry Hierarchy>, to which is attached an <Spot Light> representing the lighthouse's light. The <Spot Light> has a <Light Source Control Link> that turns the light on or off, depending on the time of day and the weather.

FAQs

What does a <Light Source Control Link> control?

A <Light Source Control Link> controls the active_light_value stored in its <Light Source>, so that the <Light Source> can be turned on and off.

Constraints

None.

Composed of (two-way)(inherited)

Component of (two-way)

Inherited Field Elements

SE_String description; (notes)

Field Elements

SE_Integer_Positive expr_index; (notes)

Notes

Fields Notes


description

 A text description of what the <Control Link> is for

expr_index

 This index specifies which <Expression> component's value controls
 whether the controlled <Light Source> instance(s) are on or off.
 If the <Expression> evaluates to SE_TRUE, the <Light Source>
 instances are on.
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Last updated: October 1, 2002 Copyright © 2002 SEDRIS™