Class Name: Scale 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 <Scale> instance.

Primary Page in DRM Diagram:

• 17

Secondary Pages in DRM Diagram:

• 7

Example

1. Externally controlled table-based animation

   Consider a <Scale Control Link> instance that is driven using values from a <Property Table> instance. The table value that is used is specified from outside the transmittal.

   For simplicity, in this example, the controlling <Expression> instance is just the table value itself, rather than some more complex <Function> instance using the table value as an argument. Specifically, the <Scale Control Link> instance's controlling <Expression> instance is a SE_PREDEF_FUNC_TABLE_VALUE <Predefined Function> instance, the argument of which is a <Property Table Reference> instance referring to the <Property Table> instance containing the scale values, as depicted in :

   

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

FAQs

No FAQs supplied.

Constraints

• <<Publishable Object>>

Composed of (two-way) (inherited)

• one or more {ordered} <Expression> instances

Component of (two-way)

• one or more <Scale> instances

Inherited Field Elements

Field Elements

Notes

Fields Notes

description

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

expr_index

The expr_index field specifies an <Expression> component, the value of which specifies the value of the scale_amount field of the affected <Scale> instances.

lower_expr_index

If non-zero, the lower_expr_index field specifies the index of the <Expression> component defining the lower limit of the scaling. A value of zero (0) indicates that no lower limit is specified; otherwise, the value specifies a one-based index into the ordered aggregation of <Expression> instances.

upper_expr_index

If non-zero, the upper_expr_index field specifies the index of the <Expression> component defining the upper limit of the scaling. A value of zero (0) indicates that no upper limit is specified; otherwise, the value specifies a one-based index into the ordered aggregation of <Expression> instances.