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

## crv Subroutine

### Purpose

Draws a cubic spline curve.

### Libraries

Graphics Library

C (**libgl.a**)

FORTRAN (**libfgl.a**)

### C Syntax

**void crv(Coord ***points***[4][3])**

### FORTRAN Syntax

**SUBROUTINE CRV(***points***)**
**REAL ***points***(3,4)**

### Description

The **crv** subroutine draws a
cubic spline curve segment (defined by the submitted points) according to the current curve basis and precision.

### Parameter

*points* |
Array containing the four points that define the curve. These must be 3-D points with *x, y, *and *z* coordinates for each point. |

### Example

The example C language program **curve1.c** uses the **crv** subroutine, after changing the curve basis and precision for each curve, to draw three curves.

### 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 series of curve segments with the **crvn** subroutine.

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

Setting the number of line segments that draw a curve segment with the **curveprecision** subroutine.

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

Drawing a rational curve with the **rcrv** subroutine.

Drawing a series of rational curve segments with the **rcrvn** subroutine.

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

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