/*
 * path.h - 2D path operations
 *
 * Written 2011 by Werner Almesberger
 * Copyright 2011 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.
 */

#ifndef PATH_H
#define PATH_H

#include <stdio.h>


struct vertex {
	double x, y;
	double r;	/* minimum bend radius; 0 = use previous value */
	double d;	/* max. distance of corner from ideal arc; 0 = prev */
	const char *tag;
	struct vertex *next;

	/*
	 * "len" is set by path_set_len to the distance to the next vertex, or
	 * 0 if this is the last vertex in the path. round_path adjusts "len"
	 * such that it corresponds to the length of the same part of the
	 * original path.
	 */
	double len;
};

struct path {
	struct vertex *vertices;
	struct vertex **last;
};


void free_path(struct path *path);

double path_set_length(struct path *path);
struct path *round_path(const struct path *path, double r, double d);
struct path *stretch_path(const struct path *path, double d);

struct path *load_path(FILE *file);
void save_path(FILE *file, const struct path *path);

#endif /* !PATH_H */