/**
 * blenlib/BKE_curve.h (mar-2001 nzc)
 *	
 * $Id$ 
 *
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */
#ifndef BKE_CURVE_H
#define BKE_CURVE_H

struct Curve;
struct ListBase;
struct Object;
struct Nurb;
struct ListBase;
struct BezTriple;
struct BevList;

#define KNOTSU(nu)	    ( (nu)->orderu+ (nu)->pntsu+ (nu->orderu-1)*((nu)->flagu & CU_CYCLIC) )
#define KNOTSV(nu)	    ( (nu)->orderv+ (nu)->pntsv+ (nu->orderv-1)*((nu)->flagv & CU_CYCLIC) )


void unlink_curve( struct Curve *cu);
void free_curve( struct Curve *cu);
struct Curve *add_curve(char *name, int type);
struct Curve *copy_curve( struct Curve *cu);
void make_local_curve( struct Curve *cu);
short curve_type( struct Curve *cu);
void test_curve_type( struct Object *ob);
void tex_space_curve( struct Curve *cu);
int count_curveverts( struct ListBase *nurb);
int count_curveverts_without_handles( struct ListBase *nurb);
void freeNurb( struct Nurb *nu);
void freeNurblist( struct ListBase *lb);
struct Nurb *duplicateNurb( struct Nurb *nu);
void duplicateNurblist( struct ListBase *lb1,  struct ListBase *lb2);
void test2DNurb( struct Nurb *nu);
void minmaxNurb( struct Nurb *nu, float *min, float *max);

void makeknots( struct Nurb *nu, short uv, short type);

void makeNurbfaces( struct Nurb *nu, float *data, int rowstride);
void makeNurbcurve( struct Nurb *nu, float *data, int resolu, int dim);
void forward_diff_bezier(float q0, float q1, float q2, float q3, float *p, int it, int stride);
float *make_orco_curve( struct Object *ob);
float *make_orco_surf( struct Object *ob);
void makebevelcurve( struct Object *ob,  struct ListBase *disp);

void makeBevelList( struct Object *ob);
float calc_curve_subdiv_radius( struct Curve *cu, struct Nurb *nu, int cursubdiv);

void calchandleNurb( struct BezTriple *bezt, struct BezTriple *prev,  struct BezTriple *next, int mode);
void calchandlesNurb( struct Nurb *nu);
void testhandlesNurb( struct Nurb *nu);
void autocalchandlesNurb( struct Nurb *nu, int flag);
void autocalchandlesNurb_all(int flag);
void sethandlesNurb(short code);

void switchdirectionNurb( struct Nurb *nu);

float (*curve_getVertexCos(struct Curve *cu, struct ListBase *lb, int *numVerts_r))[3];
void curve_applyVertexCos(struct Curve *cu, struct ListBase *lb, float (*vertexCos)[3]);

/* nurb checks if they can be drawn, also clamp order func */
int check_valid_nurb_u( struct Nurb *nu);
int check_valid_nurb_v( struct Nurb *nu);

int clamp_nurb_order_u( struct Nurb *nu);
int clamp_nurb_order_v( struct Nurb *nu);

#endif