Class

• <DRM Translation Control Link>

Superclass

• <DRM Control Link>

Subclass

• None.

Definition

An instance of this DRM class is a specialized <DRM Control Link> instance used to provide the connection between an ordered aggregation of <DRM Expression> instances and the target fields of a <DRM Translation> instance.

For a given <DRM Translation Control Link> instance C, expression_index serves as a 1-based index into the ordered <DRM Expression> components of C such that the specific <DRM Expression> instance selected specifies the value of the translation_amount field of each <DRM Translation> instance controlled by C.

For a given <DRM Translation Control Link> instance C, if lower_expression_index > 0, it serves as a 1-based index into the ordered <DRM Expression> components of C such that the specific <DRM Expression> instance selected specifies the lower limit for the translation_amount of each <DRM Translation> instance controlled by C. If lower_expression_index = 0, it indicates that no such lower limit is being specified.

For a given <DRM Translation Control Link> instance C, if upper_expression_index > 0, it serves as a 1-based index into the ordered <DRM Expression> components of C such that the specific <DRM Expression> selected specifies the upper limit for the translation_amount of each <DRM Translation> controlled by C. If upper_expression_index = 0, it indicates that no such upper limit is being specified.

Class diagram

Figure 6.339 — DRM_Translation_Control_Link

Constraints

• Publishable Object

Example(s)

• Consider a <DRM Geometry Model> instance of a building, containing a <DRM Geometry Model Instance> instance of an elevator car, where both <DRM Model> instances are specified in a LSR 3D SRF, and the elevator car is intended to be a moving part of the building model. The <DRM LSR Transformation> instance used to instance the elevator model into the building shall specify a <DRM Translation> component with a <DRM Translation Control Link> instance. This is depicted in Figure 6.340.

  

  Figure 6.340 — <DRM Translation Control Link> example

  This <DRM Translation Control Link> instance specifies:

  1. A <DRM Literal> instance, defining the lower limit (the bottom of the elevator shaft) of the translation, in this case, 0,0 metres.

  2. A <DRM Literal> instance, defining the upper limit (the top of the elevator shaft) of the translation, in this case, 500,0 metres.

  3. A <DRM Variable> instance, the actual translation of the elevator along the elevator shaft’s z axis at any given moment.

     The <DRM Variable> instance’s meaning = { VARIABLE, { TRANSLATION_AMOUNT }}

     The <DRM Variable> instance’s value_unit = EUC_METRE and its ESC_UNI, because <DRM Translation>, by definition, defines its fields in metres.