Class

• <DRM Property Table Reference Control Link>

Superclass

• <DRM Control Link>

Subclass

• None.

Definition

An instance of this DRM class specifies an <DRM Expression> instance, the value of which determines the index_on_axis field value of all target <DRM Property Table Reference> instances.

For the given <DRM Property Table Reference Control Link> instance, the value of the expression_index field specifies which of the ordered <DRM Expression> components is that which controls the index_on_axis value of the affected <DRM Property Table Reference> instances.

Class diagram

Figure 6.235 — DRM_Property_Table_Reference_Control_Link

Constraints

• Publishable Object

Example(s)

• Consider an instance of a geometric model of a wind sock, which is to be rotated depending on the wind direction; that is, whenever the wind changes, the <DRM Geometry Model Instance> instance is rotated accordingly.

  The <DRM Rotation> instance of the applicable <DRM LSR Transformation> instance is controlled by a <DRM Rotation Control Link> instance, which is driven using values from a <DRM Property Table> instance. That is, the <DRM Rotation Control Link> instance is driven by a <DRM Predefined Function> instance with value, TABLE_VALUE, containing a <DRM Property Table Reference> instance referring to the <DRM Property Table> instance containing the rotation values.

  

  Figure 6.236 — <DRM Property Table Reference Control Link> example

  The wind sock rotates around the Y axis, depending on wind speed. That is, if the wind speed is zero, it will hang down toward the ground, while if the wind speed is higher, it will straighten out parallel to the ground.

  The <DRM Property Table> instance is classified as ECC_CONTROL_VALUE, and has a <DRM Table Property Description> instance specified by ROTATION_ANGLE. The <DRM Property Table> instance specifies, for each EAC_WIND_SPEED value, the angle to which the wind sock should be rotated.

  

  Figure 6.237 — <DRM Property Table Reference Control Link> example

• Consider a <DRM Translation Control Link> instance that is to be driven using values from a <DRM Property Table> instance. The table values that are to be used are to be cycled through eight times, with each cycle taking ten seconds. This sequence of cycles is to be triggered from outside the transmittal.

  

  Figure 6.238 — <DRM Property Table Reference Control Link> example

  The <DRM Translation Control Link> instance’s controlling <DRM Expression> instance is a <DRM Predefined Function> instance with value TABLE_VALUE, whose argument is a <DRM Property Table Reference> instance referring to the <DRM Property Table> instance containing the translation values.

  

  Figure 6.239 — <DRM Property Table Reference Control Link> example

  The <DRM Table Property Description> instance for the control values and the <DRM Variable> instance controlling the referencing expression have the same meaning = { VARIABLE, { TRANSLATION_AMOUNT }}

  The <DRM Property Table Reference Control Link> instance controls which value is referenced from the <DRM Property Table> instance, and is itself driven by the CYCLE_TIME <DRM Predefined Function> instance. The cycle length (ten seconds) and the number of cycles (eight) are specified as arguments to the function.

  The <DRM Variable> instance drives the <DRM Property Table Reference Control Link> instance through the <DRM Predefined Function>, instance so that it determines which value is referenced from the <DRM Property Table> instance. To provide the hook for this <DRM Variable> instance to be set from outside the transmittal, the <DRM Variable> instance is associated with an <DRM Interface Template> instance (not shown).

  If this <DRM Translation Control Link> instance appears inside a <DRM Model> instance, to set the <DRM Variable> instance using another variable from outside the transmittal, the data provider specifies that the <DRM Geometry Model Instance>  is to supply a <DRM Variable> instance from its own context for the value of the <DRM Model> instance’s <DRM Variable> instance.