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*GL3.2 for AIX: Graphics Library (GL) Technical Reference*

## rcrv Subroutine

### Purpose

Draws a rational cubic spline curve.

### Libraries

Graphics Library

C (**libgl.a**)

FORTRAN (**libfgl.a**)

### C Syntax

**void rcrv(Coord ***geom***[4][4])**

### FORTRAN Syntax

**SUBROUTINE RCRV(***geom***)**
**REAL ***geom***(4,4)**

### Description

The **rcrv** subroutine draws a rational
cubic spline curve segment using the current curve basis and precision.

The *geom* parameter specifies the four
control points of the curve segment.

### Parameters

*geom* |
Specifies an array containing the four control points of the curve segment. |

### Implementation Specifics

This subroutine is part of GL in the AIXwindows Environment/6000 Version 1, Release 2 with AIXwindows/3D Feature.

### Files

**/usr/include/gl/gl.h** |
Contains C language constant and variable type definitions for GL. |

**/usr/include/gl/fgl.h** |
Contains FORTRAN constant and variable type definitions for GL. |

### Related Information

Drawing a cubic spline curve with the **crv** subroutine.

Drawing a series of curve segments with the **crvn** subroutine.

Setting the current cubic spline curve basis matrix for drawing curves with the **curvebasis** subroutine.

Setting the number of line segments that compose a cubic spline curve with the **curveprecision** subroutine.

Defining a cubic spline basis matrix with the **defbasis** subroutine.

AIX Graphics Library Overview, Drawing NURBS Curves and Surfaces, and Drawing Wire Frame Curves and Surface Patches.

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