Class Name: Scale Control Link

Superclass - <Control Link>

Subclasses

Definition

The specialized <Control Link> used to provide the connection between an ordered aggregation of <Expressions> and the target fields of a <Scale>.

The expr_index field is a 1-based index into the ordered aggregation of <Expressions>, and is used to select the specific <Expression> that defines <Scale's> scale_amount field.

The lower_expr_index field is a 1-based index into the ordered aggregation of <Expressions>, and is used to select the specific <Expression> that defines the lower limit for <Scale's> scale_amount.

The upper_expr_index field is a 1-based index into the ordered aggregation of <Expressions>, and is used to select the specific <Expression> that defines the upper limit for <Scale's> scale_amount.

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 to be driven using values from a <Property Table>. The table value that is to be used is to be specified from outside the transmittal.

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

   

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

FAQs

Constraints

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

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

expr_index

 This identifies a component <Expression>, the value of which
 specifies the value of the scale_amount field of the affected
 <Scale> instances.

lower_index

 index of the expression defining the lower limit of the scaling
 An upper_index value of 0 means no lower limit was defined.

upper_index

 index of the expression defining the upper limit of the scaling.
 An upper_index value of 0 means no upper limit was defined.