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The Centerline tool creates centerline geometry of a specified linetype in association with selected lines
and polylines. The Center Mark tool creates an associative center mark at the center of a selected circle,
arc, or polygonal arc. If you move the associated objects, the centerlines and center marks update
accordingly.
You can disassociate centerlines and center marks from objects using the CENTERDISASSOCIATE
command. Use the CENTERREASSOCIATE command to reassociate centerlines and center marks with
selected objects.
The following system variables control the appearance of centerlines and center marks:
CENTEREXE – Controls the length of extension line overshoots for centerlines and center marks.
CENTERMARKEXE – Determines whether extension lines are created for center marks.
CENTERLAYER – Specifies the layer on which centerlines and center marks are created.