# Synopsis

PDX_MSGT gdx_ApproxCurve(long option, MDA_PTR db_ptr)

# Purpose

Linear approximate GDX curve entity

# Description

Perform linear approximation of a GDX curve entity within the GDX linear approximation subsystem workspace. The GDX linear approximation must have been previously allocated before approximation can be performed (See gdx_AllocateApprox).

# Input

## option

### GDX_CLOSEDCRV

Treat the GDX composite edge curve as closed

### GDX_OPENSURF

Treat the GDX composite edge curve surface as open

## db_ptr

The GDX curve entity database pointer

# Return

          GDX_NOERR
          GDX_ENTITYNOTCURVE
          Low level error return
          .fi