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| 1 | /* |
| 2 | * ptrude.c - Extrusion of a 2D path along a perpendicular 2D path |
| 3 | * |
| 4 | * Written 2011 by Werner Almesberger |
| 5 | * Copyright 2011 by Werner Almesberger |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | #include <stdlib.h> |
| 14 | #include <stdio.h> |
| 15 | #include <unistd.h> |
| 16 | #include <string.h> |
| 17 | #include <math.h> |
| 18 | |
| 19 | #include "path.h" |
| 20 | #include "extrude.h" |
| 21 | #include "ptrude.h" |
| 22 | |
| 23 | |
| 24 | int debug = 0; |
| 25 | |
| 26 | |
| 27 | static FILE *open_file(const char *name, const char *mode) |
| 28 | { |
| 29 | FILE *file; |
| 30 | |
| 31 | if (!strcmp(name, "-")) |
| 32 | return strcmp(mode, "r") ? stdout : stdin; |
| 33 | |
| 34 | file = fopen(name, mode); |
| 35 | if (!file) { |
| 36 | perror(name); |
| 37 | exit(1); |
| 38 | } |
| 39 | return file; |
| 40 | } |
| 41 | |
| 42 | |
| 43 | static void close_file(FILE *file) |
| 44 | { |
| 45 | if (file == stdin || file == stdout) |
| 46 | return; |
| 47 | if (fclose(file) == EOF) { |
| 48 | perror("fclose"); |
| 49 | exit(1); |
| 50 | } |
| 51 | } |
| 52 | |
| 53 | |
| 54 | static void do_face(void *data, struct point a, struct point b, struct point c) |
| 55 | { |
| 56 | FILE *file = data; |
| 57 | |
| 58 | fprintf(file, "facet normal 0 0 0\n"); |
| 59 | fprintf(file, " outer loop\n"); |
| 60 | fprintf(file, " vertex %f %f %f\n", a.x, a.y, a.z); |
| 61 | fprintf(file, " vertex %f %f %f\n", b.x, b.y, b.z); |
| 62 | fprintf(file, " vertex %f %f %f\n", c.x, c.y, c.z); |
| 63 | fprintf(file, " endloop\nendfacet\n"); |
| 64 | } |
| 65 | |
| 66 | |
| 67 | static void do_extrude(const struct path *path, const struct path *shape, |
| 68 | double r, double d) |
| 69 | { |
| 70 | FILE *file = stdout; |
| 71 | |
| 72 | fprintf(file, "solid ptrude\n"); |
| 73 | extrude(path, shape, r, d, do_face, file); |
| 74 | fprintf(file, "endsolid ptrude\n"); |
| 75 | } |
| 76 | |
| 77 | |
| 78 | static void usage(const char *name) |
| 79 | { |
| 80 | fprintf(stderr, |
| 81 | "usage: %s shape radius tolerance\n" |
| 82 | "%6s %s path shape radius tolerance\n", |
| 83 | name, "", name); |
| 84 | exit(1); |
| 85 | } |
| 86 | |
| 87 | |
| 88 | int main(int argc, char **argv) |
| 89 | { |
| 90 | FILE *file; |
| 91 | struct path *path = NULL; |
| 92 | const struct path *shape; |
| 93 | double r, d; |
| 94 | char *end; |
| 95 | int c; |
| 96 | |
| 97 | while ((c = getopt(argc, argv, "d")) != EOF) |
| 98 | switch (c) { |
| 99 | case 'd': |
| 100 | debug = 1; |
| 101 | break; |
| 102 | default: |
| 103 | usage(*argv); |
| 104 | } |
| 105 | |
| 106 | switch (argc-optind) { |
| 107 | case 3: |
| 108 | break; |
| 109 | case 4: |
| 110 | file = open_file(argv[optind], "r"); |
| 111 | path = load_path(file); |
| 112 | close_file(file); |
| 113 | break; |
| 114 | default: |
| 115 | usage(*argv); |
| 116 | } |
| 117 | |
| 118 | file = open_file(argv[argc-3], "r"); |
| 119 | shape = load_path(file); |
| 120 | close_file(file); |
| 121 | |
| 122 | r = strtod(argv[argc-2], &end); |
| 123 | if (*end || r <= 0) |
| 124 | usage(*argv); |
| 125 | d = strtod(argv[argc-1], &end); |
| 126 | if (*end || d <= 0) |
| 127 | usage (*argv); |
| 128 | |
| 129 | if (path) { |
| 130 | /* |
| 131 | * We split the error budget evenly between path and shape. |
| 132 | */ |
| 133 | path_set_length(path); |
| 134 | shape = round_path(shape, r, sqrt(d)); |
| 135 | do_extrude(path, shape, r, sqrt(d)); |
| 136 | } else { |
| 137 | shape = round_path(shape, r, d); |
| 138 | save_path(stdout, shape); |
| 139 | } |
| 140 | |
| 141 | return 0; |
| 142 | } |
| 143 |
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