# Synopsis

PDX_MSGT gdx_CurveToPolyline(long option, MDA_PTR gdx_db_ptr, double tol, long num_pnts, int model, MDA_PTR *polyline_ptr)

# Purpose

Approximate a curve as a polyline

# Description

Approximate a curve as a polyline.

# Input

## option

### GDX_APPROX_BY_TOL

Approximate the curve by the given tolerance

### GDX_APPROX_BY_NUM_PNTS

Approximate the curve by the given number of points

### GDX_APPROX_BY_NUM_PNTS_PER_SEG

Approximate the curve by no more than the given number of points or to within a tolerance for each segment

### GDX_APPROX_BY_NUM_PNTS_OR_LINEAR

Approximate the curve by the given number of points unless it is linear

### GDX_APPROX_BY_TOL_AND_MAX_LENGTH

Approximate the curve by the given tolerance and the length of each segment should not exceed the 10 times of the given tolerance

## gdx_db_ptr

Database pointer of GDX entity

## tol

The approximation tolerance (may not be used for some options)

## num_pnts

The number of points (may not be used for some options) If 0 is passed, default value will be used.

## model

The model to create the approximation entity in

# Output

## polyline_ptr

The GDX_POLYLINE database pointer

# Return

          GDX_NOERR
          Low level error return
          .fi