/*
 * Vis5D system for visualizing five dimensional gridded data sets.
 * Copyright (C) 1990 - 2000 Bill Hibbard, Johan Kellum, Brian Paul,
 * Dave Santek, and Andre Battaiola.
 *
 * 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.
 *
 * As a special exception to the terms of the GNU General Public
 * License, you are permitted to link Vis5D with (and distribute the
 * resulting source and executables) the LUI library (copyright by
 * Stellar Computer Inc. and licensed for distribution with Vis5D),
 * the McIDAS library, and/or the NetCDF library, where those
 * libraries are governed by the terms of their own licenses.
 *
 * 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
 *
 */

#ifndef LINTERP_H
#define LINTERP_H


#include "globals.h"



#define		INTERP_TRIANGULAR_GRID_SCHEME_NONE	0
#define		INTERP_TRIANGULAR_GRID_SCHEME_NORMAL	1
#define		INTERP_TRIANGULAR_GRID_SCHEME_INVERSE	-1

#define		INTERP_FUZZ				1.0e-05



typedef float	FLOAT2[2];



extern int	line2d_eqn (float *p_xy1, float *p_xy2, double abc[3]);

extern int	line2d_int (double abc1[3], double abc2[3], float *p_xy);

extern int	line2d_regrid (FLOAT2 *xy_old, int nold, int grid_scheme,
		               FLOAT2 **p_xy_new, int *p_nnew);

extern float	interp_tri (float *z, float x, float y, int grid_scheme);

extern float	interp_z (float *verts, int ncols, int nrows, int grid_scheme,
		          float xcol, float yrow);


#endif