Workstation Pick Measures

For a list of PHIGS Workstation Picking functions and related topics, see PHIGS Workstation Picking.

The pick measure functions include:

• PEXCreatePickMeasure
• PEXFreePickMeasure
• PEXFreePMAttributes
• PEXGetPickMeasure
• PEXUpdatePickMeasure

You must create a pick measure resource to perform a pick operation using a PHIGS workstation. When you create a pick measure resource, a pick device type is specified which provides the arguments for the pick operation. The pick measure accepts input in the form of input records. Input records are defined for each type of pick device. When the pick measure passes a valid input record, then its attributes are updated. Operations on a pick measure are potentially lengthy because to get the pick results, a great number of structure elements may have to be processed.

PEXlib defines the following pick measure resource attributes:

status -

contains the result of the last update operation that was performed. It is set to PEXPick if a primitive was successfully picked, and set to PEXNoPick if the pick was unsuccessful.

pick path -

contains the path of the structure element that was picked as a result of the last update operation.