/*
 * poly2d.c - Poly2D interface functions
 *
 * Written 2012, 2015 by Werner Almesberger
 * Copyright 2012, 2015 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 <math.h>
#include <assert.h>

#include "path.h"
#include "poly2d.h"


struct p2d *path_to_poly(const struct path *path)
{
	struct p2d *poly;
	const struct point *p;

	if (!path->first || !path->first->next)
		return NULL;

	poly = p2d_new();
	for (p = path->first; p && p->next; p = p->next)
		p2d_append(poly, v2d_new(p->x, p->y));
	if (path_is_closed(path))
		p2d_close(poly);
	return poly;
}


struct p2d *paths_to_polys_z(const struct path *paths, 
    double zmin, double zmax)
{
	struct p2d *polys = NULL, **last = &polys;
	const struct path *path;

	assert(zmin <= zmax);
	for (path = paths; path; path = path->next) {
		if (path->first->z < zmin || path->first->z > zmax)
			continue;
		*last = path_to_poly(path);
		if (!*last)
			continue;
		last = &(*last)->next;
	}
	return polys;
}


struct p2d *paths_to_polys(const struct path *paths)
{
	return paths_to_polys_z(paths, -HUGE_VAL, HUGE_VAL);
}


struct path *poly_to_path(const struct p2d *poly, double r_tool, double z)
{
	struct path *path;
	const struct v2d *v;

	path = path_new(r_tool, "");
	v = poly->v;
	while (v) {
		path_add(path, v->x, v->y, z);
		v = v->next;
		if (v == poly->v)
			break;
	}
	if (v)
		path_add(path, v->x, v->y, z);
	return path;
}


struct path *polys_to_paths(const struct p2d *polys, double r_tool, double z)
{
	struct path *paths = NULL, **last = &paths;
	const struct p2d *poly;

	for (poly = polys; poly; poly = poly->next) {
		*last = poly_to_path(poly, r_tool, z);
		last = &(*last)->next;
	}
	return paths;
}