/*
 *                 GRAPH, Version 1.00 - 4 August 1989
 *
 *            Copyright 1989, David Gay. All Rights Reserved.
 *            This software is freely redistrubatable.
 */

/* The object class. All the different objects are subclasses of it */
#ifndef OBJECT_H
#define OBJECT_H

#include <stdio.h>
#include "list.h"
#include "grph.h"

#define FNAMELEN 20 /* Length of object name */

struct object
{
    node node;
    struct graph *g; /* Which graph this object is in (g->s.x,y contains curren
t mouse pos)*/
    char name [FNAMELEN]; /* Name (for functions only) "" otherwise */
    int ok; /* For functions only: is it displayed */
    int mx, my; /* Specify an (optional) displacement for the mouse pointer whe
n this is selected */
    struct Region *(*delete)    (struct object *this);
    void           (*select)    (struct object *this); /* You have been selecte
d */
    struct Region *(*deselect)  (struct object *this); /* done. does the screen
 need refreshing  ? */
    int            (*down)      (struct object *this); /* User pressed button.
Return TRUE if (x,y) is inside you */
    void           (*move)      (struct object *this);
    struct Region *(*up)        (struct object *this); /* Redraw necessary ? */
     
    int            (*edit)      (struct object *this, struct Region **ref); /*
Returns true if graph changed */
    void           (*draw)      (struct object *this, int allow_mes);
    struct Region *(*improve)   (struct object *this);
    char          *(*f2str)     (struct object *this, char *buf, int maxlen);
    void           (*var_change)(struct object *this, char *name); /* Change in
 variable "name" */
    int            (*save)      (struct object *this, FILE *f);
    int            (*inform)    (struct object *this); /* Inform of changes to
g */
    void           (*confirm)   (struct object *this, int ok); /* Confirm previ
ous changes */
};

/* A special object, used for selecting points on screen (cross hair mode) */
/* The fields are public. Only new, down, move, up and deselect are implemented
  */
struct pos
{
    struct object o;
    int cross : 1;
    int rect : 1;
    double x0, y0, x1, y1;
};

struct pos *new_pos(struct graph *g);

/* A label on the graph */
struct label *new_label(struct graph *g, double x, double y);
struct label *load_label(struct graph *g, FILE *f);

/* A function (ie f(x), r(theta), etc */
struct function *new_function(struct graph *g);
struct function *load_function(struct graph *g, FILE *f);

#endif