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- /*
- * (c) Copyright 1993, Silicon Graphics, Inc.
- * ALL RIGHTS RESERVED
- * Permission to use, copy, modify, and distribute this software for
- * any purpose and without fee is hereby granted, provided that the above
- * copyright notice appear in all copies and that both the copyright notice
- * and this permission notice appear in supporting documentation, and that
- * the name of Silicon Graphics, Inc. not be used in advertising
- * or publicity pertaining to distribution of the software without specific,
- * written prior permission.
- *
- * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
- * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
- * FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
- * GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
- * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
- * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
- * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
- * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
- * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
- * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * US Government Users Restricted Rights
- * Use, duplication, or disclosure by the Government is subject to
- * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
- * (c)(1)(ii) of the Rights in Technical Data and Computer Software
- * clause at DFARS 252.227-7013 and/or in similar or successor
- * clauses in the FAR or the DOD or NASA FAR Supplement.
- * Unpublished-- rights reserved under the copyright laws of the
- * United States. Contractor/manufacturer is Silicon Graphics,
- * Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
- *
- * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
- */
- /*
- * curve.c
- * This program uses the Utility Library NURBS routines to
- * draw a one-dimensional NURBS curve.
- */
- #include <GL/gl.h>
- #include <GL/glu.h>
- #include <stdlib.h>
- #include "glaux.h"
-
- GLUnurbsObj *theNurb;
-
- void myinit(void)
- {
- glShadeModel (GL_FLAT);
- theNurb = gluNewNurbsRenderer();
- gluNurbsProperty (theNurb, GLU_SAMPLING_TOLERANCE, 10.0);
- }
-
- /* This routine draws a B-spline curve. Try a different
- * knot sequence for a Bezier curve. For example,
- GLfloat knots[8] = {0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0};
- */
-
- void display(void)
- {
- GLfloat ctlpoints[4][3] = {{-.75, -.75, 0.0},
- {-.5, .75, 0.0}, {.5, .75, 0.0}, {.75, -.75, 0.0}};
- GLfloat knots[8] = {0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0};
-
- glClear(GL_COLOR_BUFFER_BIT);
- glColor3f (1.0, 1.0, 1.0);
- gluBeginCurve(theNurb);
- gluNurbsCurve(theNurb,
- 8, knots,
- 3,
- &ctlpoints[0][0],
- 4,
- GL_MAP1_VERTEX_3);
- gluEndCurve(theNurb);
- glFlush();
- }
-
- void myReshape(int w, int h)
- {
- glViewport(0, 0, w, h);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- if (w <= h)
- gluOrtho2D (-1.0, 1.0, -1.0 * (GLfloat) h/(GLfloat) w,
- 1.0 * (GLfloat) h/(GLfloat) w);
- else
- gluOrtho2D (-1.0 * (GLfloat) w/(GLfloat) h,
- 1.0 * (GLfloat) w/(GLfloat) h, -1.0, 1.0);
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
- }
-
- /* Main Loop
- */
- int main(int argc, char** argv)
- {
- auxInitDisplayMode (AUX_SINGLE | AUX_RGB);
- auxInitPosition (0, 0, 500, 500);
- if (!auxInitWindow (argv[0]))
- auxQuit();
- myinit();
- auxReshapeFunc (myReshape);
- auxMainLoop(display);
- return 0;
- }
-