Function Entry: VLAX-CURVE-ISPERIODIC

← Prev | ↑ Chapter | Next → | Index | Symbols

Function Entry: VLAX-CURVE-ISPERIODIC

Name

vlax-curve-isPeriodic

Class

Visual LISP curve predicate

Syntax

(vlax-curve-isPeriodic curve)

Arguments and Values

curve — VLA-object to test.

Description

Determines whether the specified curve has an infinite periodic parameterization.

Return Values

T if the curve is periodic
nil otherwise

Notes

Autodesk defines periodicity here as the existence of a period value dT such that, for any parameter u, the point at (u + dT) equals the point at u.

Side Effects

None.

Availability

AutoCAD 2026: documented (per Autodesk reference page).
BricsCAD V26: presumed compatible (no contradicting page found).
Status: AutoCAD documented; BricsCAD presumed-both pending Phase 4 verification.

Source Notes

[vlax-curve-isPeriodic (AutoLISP/ActiveX)](https://help.autodesk.com/cloudhelp/2026/ENU/AutoCAD-LT-AutoLISP-Reference/files/GUID-0A082EE2-ACE0-49CE-981D-2665738C7DC2.htm)

Compatibility

Available only on Windows; not available on macOS or Web.