Class Name: Sound Instance Control Link

Superclass - <Control Link>

Subclasses

Definition

An instance of this DRM class is a specialized <Control Link> instance used to provide the connection between an ordered aggregation of <Expression> instances and the target fields of a <Sound Instance> instance, controlling the active_sound_value stored in the target <Sound Instance> instance(s) so that each can be turned on or off.

Primary Page in DRM Diagram:

• 17

Secondary Pages in DRM Diagram:

• 22

Example

1. A <Model> instance representing a lighthouse has a <Geometry Model> component with a <Union Of Geometry Hierarchy> component, which is attached a <Sound Instance> instance representing the foghorn. The <Sound Instance> instance has a <Sound Instance Control Link> component that turns the foghorn on or off, depending on the weather.

FAQs

Can a <Sound Instance Control Link> be used to change which <Sound> is accessed by a <Sound Instance>?

No. The link to the <Sound> is an association within the transmittal, and associations cannot be changed dynamically.

Constraints

• <<Publishable Object>>

Composed of (two-way) (inherited)

• one or more {ordered} <Expression> instances

Component of (two-way)

• one or more <Sound Instance> instances

Inherited Field Elements

Field Elements

Notes

Fields Notes

description

 The description field specifies a text description of the given
 <Control Link> instance's purpose.

active_sound_value_expr_index

 The active_sound_value_expr_index field specifies the <Expression>
 component, the value of which controls the value of the
 active_sound_value field of the affected <Sound Instance> instance(s).
 If the controlling <Expression> instance is evaluated to SE_TRUE, the
 affected <Sound Instance> instances are on.