51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
/*
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* path.h - 2D path operations
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*
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* Written 2011 by Werner Almesberger
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* Copyright 2011 by Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef PATH_H
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#define PATH_H
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#include <stdio.h>
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struct vertex {
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double x, y;
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double r; /* minimum bend radius; 0 = use previous value */
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double d; /* max. distance of corner from ideal arc; 0 = prev */
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const char *tag;
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struct vertex *next;
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/*
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* "len" is set by path_set_len to the distance to the next vertex, or
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* 0 if this is the last vertex in the path. round_path adjusts "len"
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* such that it corresponds to the length of the same part of the
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* original path.
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*/
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double len;
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};
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struct path {
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struct vertex *vertices;
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struct vertex **last;
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};
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void free_path(struct path *path);
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double path_set_length(struct path *path);
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struct path *round_path(const struct path *path, double r, double d);
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struct path *stretch_path(const struct path *path, double dist, double r);
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struct path *load_path(FILE *file);
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void save_path(FILE *file, const struct path *path);
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#endif /* !PATH_H */
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