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cae-tools/cameo/area-poly2d.c

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2012-05-08 06:52:47 +03:00
/*
* area-poly2d.c - Area fill (using libpoly2d)
*
* Written 2012 by Werner Almesberger
* Copyright 2012 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 <math.h>
#include <poly2d.h>
#include "path.h"
#include "area.h"
static void fill_path(const struct path *paths, double z, double overlap,
struct path ***res)
{
const struct path *path;
const struct point *p;
double r_tool;
struct p2d *polys = NULL, *poly, *last = NULL;
struct p2d *fill;
const struct v2d *v;
for (path = paths; path; path = path->next) {
if (path->first->z != z)
continue;
if (!path->first || !path->first->next)
continue;
r_tool = path->r_tool;
poly = p2d_new();
if (last)
last->next = poly;
else
polys = poly;
last = poly;
for (p = path->first; p && p->next; p = p->next)
p2d_append(poly, v2d_new(p->x, p->y));
p2d_close(poly);
}
fill = p2d_area(polys, r_tool, 2*r_tool-overlap);
p2d_free_all(polys);
for (poly = fill; poly; poly = poly->next) {
**res = path_new(r_tool, "");
v = poly->v;
while (v) {
path_add(**res, v->x, v->y, z);
v = v->next;
if (v == poly->v)
break;
}
if (v)
path_add(**res, v->x, v->y, z);
*res = &(**res)->next;
}
p2d_free_all(fill);
}
struct path *area(const struct path *paths, double overlap)
{
double z = HUGE_VAL, best_z;
const struct path *path;
struct path *res = NULL, **last = &res;
while (1) {
best_z = -HUGE_VAL;
for (path = paths; path; path = path->next) {
if (path->first->z >= z)
continue;
if (best_z >= path->first->z)
continue;
best_z = path->first->z;
}
if (best_z == -HUGE_VAL)
break;
fill_path(paths, best_z, overlap, &last);
z = best_z;
}
return res;
}