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cae-tools/slicer/stl.c
2015-01-07 20:44:35 -03:00

121 lines
2.1 KiB
C

/*
* stl.c - STL file reading
*
* Written 2014 by Werner Almesberger
* Copyright 2014 by Werner Almesberger
*
* This program 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.
*/
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <math.h>
#include "mesh.h"
#include "stl.h"
#define MAX_LINE 100
enum state {
s_init,
s_facet,
s_loop,
s_vertices,
s_endloop,
s_endfacet,
};
void stl_load_file(FILE *file)
{
char buf[MAX_LINE+1];
enum state state = s_init;
const struct vertex *v[3];
int num_v = 0;
char *s, *e;
int n = 0;
int end, got;
float x, y, z;
mesh_init();
while (fgets(buf, sizeof(buf), file)) {
n++;
if (!(n & 1023))
fprintf(stderr, "%d\r", n);
for (s = buf; *s && isspace(*s); s++);
e = strchr(s, 0);
while (e != s && isspace(e[-1]))
e--;
*e = 0;
end = 0;
switch (state) {
case s_init:
sscanf(s, "solid %*s%n", &end);
state = s_facet;
break;
case s_facet:
if (!strncmp(s, "endsolid", 8))
return;
sscanf(s, "facet normal %*f %*f %*f%n", &end);
state = s_loop;
break;
case s_loop:
sscanf(s, "outer loop%n", &end);
state = s_vertices;
num_v = 0;
break;
case s_vertices:
got = sscanf(s, "vertex %f %f %f%n", &x,&y, &z, &end);
if (got < 3)
break;
v[num_v] = vertex_add(
roundf(x*1000), roundf(-y*1000), roundf(z*1000));
if (++num_v == 3) {
facet_add(v[0], v[1], v[2]);
state = s_endloop;
}
break;
case s_endloop:
sscanf(s, "endloop%n", &end);
state = s_endfacet;
break;
case s_endfacet:
sscanf(s, "endfacet%n", &end);
state = s_facet;
break;
}
if (end != e-s) {
fprintf(stderr, "cannot parse line %d (%d %ld)\n",
n, end, e-s);
exit(1);
}
}
fprintf(stderr, "incomplete STL file\n");
exit(1);
}
void stl_load(const char *name)
{
FILE *file;
file = fopen(name, "r");
if (!file) {
perror(name);
exit(1);
}
stl_load_file(file);
fclose(file);
}