graPHIGS Programming Interface: Subroutine Reference

The graPHIGS Programming Interface : Subroutine Reference

GPQTDF - Inquire Trimming Curve Display Facilities

GPQTDF (wstype, start, number, errind, order, totnum, criteria)

Note:

This subroutine is a Workstation Description Table (WDT) inquiry. For an overview, see "WDT Inquiries"

Purpose

Use GPQTDF to inquire the trimming curve facilities for the specified workstation type.

If the information is available, then the graPHIGS API sets the error indicator to zero and returns the values in the output parameter. If the error indicator is 543 (the start value exceeds the extent of the available data), then only the total number ( totnum) parameter is set. If the inquired information is unavailable, then the error indicator ( errind) contains the error number indicating the reason, and the values returned in the output parameter are unpredictable.

Parameters

wstype -- specified by user, 8-byte character string.

Workstation type.

start -- specified by user, fullword integer

Starting member of the list of available trimming curve approximation criteria (>=1)

number -- specified by user, fullword integer

Number of trimming curve approximation criteria requested (>=0)

errind -- returned by the graPHIGS API, fullword integer

Error indicator. If the error indicator is zero, the request has been completed. Otherwise, one of the following errors exists:

23: SPECIFIED WORKSTATION TYPE DOES NOT EXIST
35: WORKSTATION HAS ONLY INPUT CAPABILITIES
538: START VALUE < ONE
539: REQUESTED NUMBER < ZERO
543: START EXCEEDS DATA EXTENT. TOTAL NUMBER AVAILABLE RETURNED
548: SPECIFIED WORKSTATION TYPE CANNOT BE LOADED

order -- returned by the graPHIGS API, fullword integer

Maximum trimming curve order supported.

totnum -- returned by the graPHIGS API, fullword integer

Total number of available trimming curve approximation criteria.

criteria -- returned by the graPHIGS API, array of fullword integers

List of trimming curve approximation criteria (1=WORKSTATION_DEPENDENT, 3=CONSTANT_SUBDIVISION_BETWEEN_KNOTS, 8=VARIABLE_SUBDIVISION_BETWEEN_KNOTS )

Error Codes

None

Related Subroutines

GPQRCT: Inquire Realized Connection Type
GPTNBS: Trimmed Non-Uniform B-Spline Surface

RCP code

201346058 ( X'0C004C0A')