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SGI Developer Toolbox 6.1
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SGI Developer Toolbox 6.1 - Disc 1.iso
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Roundwall.c++
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C/C++ Source or Header
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1996-11-11
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3KB
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97 lines
/*
* (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.
*
* U.S. GOVERNMENT RESTRICTED RIGHTS LEGEND
* 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* Unpublished-- rights reserved under the copyright laws of the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.
*/
#include <GL/glu.h>
#include <GL/glx.h>
#include <math.h>
#include "Roundwall.h"
Roundwall::Roundwall()
{
height = 2;
radius = 20;
divisions = 20;
sint = cost = NULL;
}
void Roundwall::draw()
{
float texx = 0;
int i;
if (sint == NULL) compute_tables();
glBegin(GL_QUAD_STRIP);
for (i = 0; i <= divisions; i++, texx += 1.) {
glTexCoord2f(texx, 0);
glNormal3f(-cost[i], -sint[i], 0);
glVertex3f(radius * cost[i], radius * sint[i], 0);
glTexCoord2f(texx, 1);
glVertex3f(radius * cost[i], radius * sint[i], height);
}
glEnd();
}
void Roundwall::set_divisions(int d)
{
if (divisions != d) delete_tables();
divisions = d;
}
void Roundwall::delete_tables()
{
delete sint;
delete cost;
sint = cost = NULL;
}
void Roundwall::compute_tables()
{
int i;
float t, dt;
delete_tables();
cost = new float[divisions + 1];
sint = new float[divisions + 1];
dt = 2. * M_PI / divisions;
for (i = 0, t = 0.; i <= divisions; i++, t += dt) {
cost[i] = cos(t);
sint[i] = sin(t);
}
}