Table 6.243—DRM_Rotation_Control_Link

Property

Description

Superclass

· <DRM Control Link>

Class

· <DRM Rotation Control Link>

Subclass

· none

Definition

This is a specialized <DRM Control Link> used to provide the connection between an ordered aggregation of <DRM Expression>s and the target fields of a <DRM Rotation>.

The expression_index field is a 1-based index into the ordered aggregation of <DRM Expression>s, and is used to select the specific <DRM Expression> that defines the angle field of <DRM Rotation>.

The lower_expression_index field is a 1-based index into the ordered aggregation of <DRM Expression>s, and is used to select the specific <DRM Expression> that defines the lower limit for the angle field of <DRM Rotation>.

The upper_expression_index field is a 1-based index into the ordered aggregation of <DRM Expression>s, and is used to select the specific <DRM Expression> that defines the upper limit for the angle field of <DRM Rotation>.

Example(s)

· A <DRM Model> of a weather vane has a <DRM Geometry Model> with a <DRM Union Of Geometry Hierarchy> component, to which is attached an <DRM LSR Transformation> with a <DRM Rotation> object, indicating that the weather vane can turn to match the direction that the wind is blowing. The <DRM Rotation> object has a <DRM Rotation Control Link>, which changes the angle of rotation to match the wind direction.

Inherited field elements

field_name	range	Field_Data_Type
description^1		String

Field elements

field_name	range	Field_Data_Type
expression_index^2		Integer_Unsigned
lower_expression_index^3		Integer_Unsigned
upper_expression_index^4		Integer_Unsigned

Associated to (one-way) (inherited)

· none

Associated to (one-way)

· none

Associated by (one-way) (inherited)

· none

Associated by (one-way)

· none

Associated with (two-way) (inherited)

· none

Associated with (two-way)

· none

Composed of (two-way) (inherited)

· one or more {ordered} <DRM Expression>s

Composed of (two-way)

· none

Composed of (two-way metadata) (inherited)

· none

Composed of (two-way metadata)

· none

Component of (two-way) (inherited)

· zero or one <DRM LSR Transformation>

Component of (two-way)

· zero or more <DRM Camera Point>s

Constraints

· none

Notes

¹ A text description of what the <DRM Control Link> is for.

² Index of the expression whose value controls the angle field of the affected <DRM Rotation>.

³ Index of the expression defining the lower limit of the rotation angle. A lower_expression_index value of 0 means no lower limit was defined.

⁴ Index of the expression defining the upper limit of the rotation angle. An upper_expression_index value of 0 means no lower limit was defined.

Class diagram

<DRM Rotation Control Link>