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| 1 | /* |
| 2 | * path.h - 2D path operations |
| 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 | #ifndef PATH_H |
| 14 | #define PATH_H |
| 15 | |
| 16 | #include <stdio.h> |
| 17 | |
| 18 | |
| 19 | struct vertex { |
| 20 | double x, y; |
| 21 | double r; /* minimum bend radius; 0 = use previous value */ |
| 22 | double d; /* max. distance of corner from ideal arc; 0 = prev */ |
| 23 | const char *tag; |
| 24 | struct vertex *next; |
| 25 | |
| 26 | /* |
| 27 | * "len" is set by path_set_len to the distance to the next vertex, or |
| 28 | * 0 if this is the last vertex in the path. round_path adjusts "len" |
| 29 | * such that it corresponds to the length of the same part of the |
| 30 | * original path. |
| 31 | */ |
| 32 | double len; |
| 33 | }; |
| 34 | |
| 35 | struct path { |
| 36 | struct vertex *vertices; |
| 37 | struct vertex **last; |
| 38 | }; |
| 39 | |
| 40 | |
| 41 | void free_path(struct path *path); |
| 42 | |
| 43 | double path_set_length(struct path *path); |
| 44 | struct path *round_path(const struct path *path, double r, double d); |
| 45 | struct path *stretch_path(const struct path *path, double dist, double r); |
| 46 | |
| 47 | struct path *load_path(FILE *file); |
| 48 | void save_path(FILE *file, const struct path *path); |
| 49 | |
| 50 | #endif /* !PATH_H */ |
| 51 |
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