# Synopsis

PDX_MSGT gcr_ParabolicConic(long option, MDA_PTR orig_db_ptr, MTH_2DPNT xy_trans, double z_depth, double focal_dist, double t0, double t1, GDX_MATRIX gdx_matrix, int gdx_model, MDA_PTR *gdx_conic_ptr)

# Purpose

Create a GDX Conic (parabola).

# Description

This function given a 2D xy translation point, a z depth, focal length, a parametric start value (t0), and a parametric end value (t1) creates a parabolic GDX Conic entity.

The orig_db_ptr argument should contain the database pointer of the entity that the new entity was created from (usually this should be obtained by the calling routine via mda_GetOrigDbptr) or MDA_NULL_PTR. See the mda_intro man page for more information about predecessor entities.

\fBRules\fR .IP • 3 t0 is such that the focal_dist * t0 * t0 equals x start point and 2.0 * focal_dist * t0 equals y start point. .IP • 3 t1 is such that the focal_dist * t1 * t1 equals x end point and 2.0 * focal_dist * t1 equals y end point. .IP • 3 t0 != t1. .LP

# Input

## option

### GCR_NOVALIDATE

No validation will occur on the input data.

## orig_db_ptr

The original entities orig_db_ptr as obtained from the mda_GetOrigDbptr call, or MDA_NULL_PTR

## xy_trans

The 2D XY translation, or NULL

## z_depth

The depth of the parabola along the Z axis

## focal_dist

The focal_dist.

## t0

Start parametric value.

## t1

End parametric value.

## gdx_matrix

GDX rotation matrix, or NULL.

## gdx_model

The GDX model for entity creation

# Output

## gdx_conic_ptr

Entity database pointer of the GDX Conic (parabola)

# Tolerances

          GDX ZERO_TOL
          .fi

# Return

          GCR_NOERR
          GCR_INVALID_MODEL
          GCR_PARA_T1
          Low level error return
          .fi