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wiresphere.c

/*
 * wiresphere.c
 *
 * Copyright (C) 2004-2006 Simon Wunderlich <dotslash@packetmixer.de>
 *
 * This file is part of s3d, a 3d network display server.
 * See http://s3d.berlios.de/ for more updates.
 *
 * s3d is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * s3d is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with s3d; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */


#include <s3d.h>
#include <stdio.h>  /* NULL, sprintf() */
#include <time.h> /* nanosleep()  */
#include <math.h> /* M_PI, cos(), sin() */
#include <stdlib.h> /* malloc(), free() */
#include "example.h" /* S3DUNUSED */
static struct timespec t = {
      0, 100*1000*1000
}; /* 100 mili seconds */
static int oid;
static int r;
static int wire_sphere(int slices, int stacks)
{
      int x, y, i, o;
      unsigned int num_v, num_l;
      float *v, *n;  /* vertices, normals */
      float alpha, beta;
      unsigned int *l; /* lines */
      num_v = (stacks + 1) * slices;
      num_l = stacks * slices + (stacks - 1) * slices; /* vertical + horizontal */
      v = (float*)malloc(sizeof(float) * 3 * num_v);
      n = (float*)malloc(sizeof(float) * 6 * num_l);
      l = (unsigned int*)malloc(sizeof(unsigned int) * 3 * num_l);
      i = 0;
      for (x = 0;x < slices;x++) {
            alpha = (x * 360.0f / slices) * (float)M_PI / 180.0f;
            for (y = 0;y < (stacks + 1);y++) {
                  beta = ((y * 180 / slices) - 90.0f) * (float)M_PI / 180.0f;
                  v[i*3+0] = cosf(alpha) * cosf(beta);
                  v[i*3+1] = sinf(beta);
                  v[i*3+2] = sinf(alpha) * cosf(beta);
                  i++;
            }
      }
      i = 0;
      for (x = 0;x < slices;x++) {
            for (y = 0;y < stacks;y++) {
                  if ((y != 0) && (y != stacks)) { /* no horizontal lines at the poles */
                        l[i*3+0] = (x * (stacks + 1)) + y;
                        l[i*3+1] = (((x + 1) % slices) * (stacks + 1)) + y;
                        l[i*3+2] = 0;
                        n[i*6+0] = v[ l[i*3+0] * 3 + 0];
                        n[i*6+1] = v[ l[i*3+0] * 3 + 1];
                        n[i*6+2] = v[ l[i*3+0] * 3 + 2];
                        n[i*6+3] = v[ l[i*3+1] * 3 + 0];
                        n[i*6+4] = v[ l[i*3+1] * 3 + 1];
                        n[i*6+5] = v[ l[i*3+1] * 3 + 2];

                        i++;

                  }
                  /* vertical lines */
                  l[i*3+0] = (x * (stacks + 1)) + y;
                  l[i*3+1] = (x * (stacks + 1)) + y + 1;
                  l[i*3+2] = 0;
                  n[i*6+0] = v[ l[i*3+0] * 3 + 0];
                  n[i*6+1] = v[ l[i*3+0] * 3 + 1];
                  n[i*6+2] = v[ l[i*3+0] * 3 + 2];
                  n[i*6+3] = v[ l[i*3+1] * 3 + 0];
                  n[i*6+4] = v[ l[i*3+1] * 3 + 1];
                  n[i*6+5] = v[ l[i*3+1] * 3 + 2];
                  i++;

            }
      }
      o = s3d_new_object();
      s3d_push_material(o, 0, 0, 1,
                        1, 0, 0,
                        0, 1, 0);
      s3d_push_vertices(o, v, (uint16_t)num_v);
      s3d_push_lines(o, l, (uint16_t)num_l);
      s3d_load_line_normals(o, n, 0, (uint16_t)num_l);
      free(v);
      free(n);
      free(l);
      return(o);
}
static void stop(struct s3d_evt *S3DUNUSED(evt))
{
      s3d_quit();
}

static void mainloop(void)
{
      r = (r + 1) % 360;
      s3d_rotate(oid, 0, (float)r, 0);
      nanosleep(&t, NULL);

}
int main(int argc, char **argv)
{
      if (!s3d_init(&argc, &argv, "wiresphere")) {
            oid = wire_sphere(30, 30);
            s3d_scale(oid, 10);
            s3d_flags_on(oid, S3D_OF_VISIBLE | S3D_OF_SELECTABLE);
            s3d_set_callback(S3D_EVENT_OBJ_CLICK, (s3d_cb)stop);
            s3d_set_callback(S3D_EVENT_QUIT, (s3d_cb)stop);
            s3d_mainloop(mainloop);
            /*  wait for some object to be clicked */
            s3d_quit();
      }
      return(0);
}



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