/*
 * This is a plug-in for the GIMP.
 *
 * Split up images according to a given formula.
 *
 * Copyright (C) 1999, 2000 Maurits Rijk  lpeek.mrijk@consunet.nl
 *
 * 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.
 *
 */

#ifndef _EXPRESSION_H
#define _EXPRESSION_H

typedef struct Expression {
   void (*destruct)(struct Expression *e);
   double (*eval)(struct Expression *e, double x, double y);
} Expression_t;

void expression_destruct(Expression_t *e);

Expression_t *expression_num_new(double num);
Expression_t *expression_x_new(void);
Expression_t *expression_y_new(void);
Expression_t *expression_add_new(Expression_t *e1, Expression_t *e2);
Expression_t *expression_sub_new(Expression_t *e1, Expression_t *e2);
Expression_t *expression_mul_new(Expression_t *e1, Expression_t *e2);
Expression_t *expression_div_new(Expression_t *e1, Expression_t *e2);
Expression_t *expression_pow_new(Expression_t *e1, Expression_t *e2);
Expression_t *expression_mod_new(Expression_t *e1, Expression_t *e2);
Expression_t *expression_neg_new(Expression_t *e);
Expression_t *expression_abs_new(Expression_t *e);
Expression_t *expression_acos_new(Expression_t *e);
Expression_t *expression_asin_new(Expression_t *e);
Expression_t *expression_atan_new(Expression_t *e);
Expression_t *expression_atan2_new(Expression_t *e);
Expression_t *expression_ceil_new(Expression_t *e);
Expression_t *expression_cos_new(Expression_t *e);
Expression_t *expression_cosh_new(Expression_t *e);
Expression_t *expression_exp_new(Expression_t *e);
Expression_t *expression_floor_new(Expression_t *e);
Expression_t *expression_ldexp_new(Expression_t *e1, Expression_t *e2);
Expression_t *expression_log_new(Expression_t *e);
Expression_t *expression_log10_new(Expression_t *e);
Expression_t *expression_min_new(Expression_t *e1, Expression_t *e2);
Expression_t *expression_max_new(Expression_t *e1, Expression_t *e2);
Expression_t *expression_rand_new(void);
Expression_t *expression_rint_new(Expression_t *e);
Expression_t *expression_sin_new(Expression_t *e);
Expression_t *expression_sinh_new(Expression_t *e);
Expression_t *expression_sqrt_new(Expression_t *e);
Expression_t *expression_tan_new(Expression_t *e);
Expression_t *expression_tanh_new(Expression_t *e);

#define expression_eval(e, x, y) \
	((e)->eval((e), x, y))

#endif /* _EXPRESSION_H */