mirror of
git://projects.qi-hardware.com/cae-tools.git
synced 2024-12-23 03:22:25 +02:00
96 lines
1.5 KiB
C
96 lines
1.5 KiB
C
/*
|
|
* p2d_copy.c - Copy a polygon, with or without reversing it
|
|
*
|
|
* Written 2012 by Werner Almesberger
|
|
* Copyright 2012 Werner Almesberger
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
|
|
#include <math.h>
|
|
|
|
#include "util.h"
|
|
#include "poly2d.h"
|
|
|
|
|
|
struct p2d *p2d_copy(const struct p2d *p)
|
|
{
|
|
struct p2d *np;
|
|
const struct v2d *v;
|
|
struct v2d *nv, **last;
|
|
|
|
np = alloc_type(struct p2d);
|
|
np->v = NULL;
|
|
np->last = NULL;
|
|
np->next = NULL;
|
|
|
|
last = &np->v;
|
|
v = p->v;
|
|
while (v) {
|
|
nv = alloc_type(struct v2d);
|
|
nv->x = v->x;
|
|
nv->y = v->y;
|
|
nv->next = NULL;
|
|
*last = nv;
|
|
last = &nv->next;
|
|
|
|
np->last = nv;
|
|
|
|
v = v->next;
|
|
if (v == p->v)
|
|
break;
|
|
}
|
|
if (v)
|
|
*last = np->v;
|
|
return np;
|
|
}
|
|
|
|
|
|
struct p2d *p2d_copy_all(const struct p2d *p)
|
|
{
|
|
struct p2d *res = NULL, **last = &res;
|
|
|
|
while (p) {
|
|
*last = p2d_copy(p);
|
|
last = &(*last)->next;
|
|
p = p->next;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
|
|
struct p2d *p2d_reverse(const struct p2d *p)
|
|
{
|
|
struct p2d *np;
|
|
const struct v2d *v;
|
|
struct v2d *nv;
|
|
|
|
np = alloc_type(struct p2d);
|
|
np->v = NULL;
|
|
np->last = NULL;
|
|
np->next = NULL;
|
|
|
|
v = p->v;
|
|
while (v) {
|
|
nv = alloc_type(struct v2d);
|
|
nv->x = v->x;
|
|
nv->y = v->y;
|
|
nv->next = np->v;
|
|
np->v = nv;
|
|
|
|
if (!np->last)
|
|
np->last= nv;
|
|
|
|
v = v->next;
|
|
if (v == p->v)
|
|
break;
|
|
}
|
|
if (v && np->last)
|
|
np->last->next = np->v;
|
|
return np;
|
|
}
|