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The C Users' Group Library 1994 August
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wc-cdrom-cusersgrouplibrary-1994-08.iso
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vol_300
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334_02
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plot.h
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1991-02-05
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/* GNUPLOT - plot.h */
/*
* Copyright (C) 1986, 1987, 1990 Thomas Williams, Colin Kelley
*
* Permission to use, copy, and distribute this software and its
* documentation for any purpose with or without fee is hereby granted,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation.
*
* Permission to modify the software is granted, but not the right to
* distribute the modified code. Modifications are to be distributed
* as patches to released version.
*
* This software is provided "as is" without express or implied warranty.
*
*
* AUTHORS
*
* Original Software:
* Thomas Williams, Colin Kelley.
*
* Gnuplot 2.0 additions:
* Russell Lang, Dave Kotz, John Campbell.
*
* send your comments or suggestions to (pixar!info-gnuplot@sun.com).
*
*/
#define PROGRAM "G N U P L O T"
#define PROMPT "gnuplot> "
#define SHELL "/bin/sh" /* used if SHELL env variable not set */
#define SAMPLES 160 /* default number of samples for a plot */
#define ZERO 1e-8 /* default for 'zero' set option */
#ifndef TERM
/* default terminal is "unknown"; but see init_terminal */
#define TERM "unknown"
#endif
#define TRUE 1
#define FALSE 0
#define Pi 3.141592653589793
#define MAX_POINTS 1
#define MAX_LINE_LEN 1024 /* maximum number of chars allowed on line */
#define MAX_TOKENS 200
#define MAX_ID_LEN 50 /* max length of an identifier */
#define MAX_AT_LEN 150 /* max number of entries in action table */
#define STACK_DEPTH 100
#define NO_CARET (-1)
#ifdef vms
#define OS "VMS "
#endif
#ifdef unix
#define OS "unix "
#endif
#ifdef MSDOS
#define OS "MS-DOS "
#endif
#ifndef OS
#define OS ""
#endif
/*
* Note about VERYLARGE: This is the upper bound double (or float, if PC)
* numbers. This flag indicates very large numbers. It doesn't have to
* be the absolutely biggest number on the machine.
* If your machine doesn't have HUGE, or float.h,
* define VERYLARGE here.
*
* example:
#define VERYLARGE 1e38
*/
#ifdef PC
#include <float.h>
#define VERYLARGE FLT_MAX
#else
#ifdef vms
#include <float.h>
#define VERYLARGE DBL_MAX
#else
#define VERYLARGE HUGE
#endif
#endif
#define END_OF_COMMAND (c_token >= num_tokens || equals(c_token,";"))
#ifdef vms
#define is_comment(c) ((c) == '#' || (c) == '!')
#define is_system(c) ((c) == '$')
#else /* vms */
#define is_comment(c) ((c) == '#')
#define is_system(c) ((c) == '!')
#endif /* vms */
/*
* If you're memcpy() has another name, define it below as bcopy() is.
* If you don't have a memcpy():
#define NOCOPY
*/
#ifdef BCOPY
#define memcpy(dest,src,len) bcopy(src,dest,len)
#endif /* BCOPY */
#ifdef vms
#define memcpy(dest,src,len) lib$movc3(&len,src,dest)
#endif /* vms */
/*
* If you don't have BZERO, define it below.
*/
#ifndef BZERO
#define bzero(dest,len) (void)(memset(dest, (char)NULL, len))
#endif /* BZERO */
#define top_of_stack stack[s_p]
typedef int BOOLEAN;
#ifdef __ZTC__
typedef int (*FUNC_PTR)(...);
#else
typedef int (*FUNC_PTR)();
#endif
enum operators {
PUSH, PUSHC, PUSHD, CALL, LNOT, BNOT, UMINUS, LOR, LAND, BOR, XOR,
BAND, EQ, NE, GT, LT, GE, LE, PLUS, MINUS, MULT, DIV, MOD, POWER,
FACTORIAL, BOOL, JUMP, JUMPZ, JUMPNZ, JTERN, SF_START
};
#define is_jump(operator) ((operator) >=(int)JUMP && (operator) <(int)SF_START)
enum DATA_TYPES {
INT, CMPLX
};
enum PLOT_TYPE {
FUNC, DATA
};
enum PLOT_STYLE {
LINES, POINTS, IMPULSES, LINESPOINTS, DOTS
};
enum JUSTIFY {
LEFT, CENTRE, RIGHT
};
struct cmplx {
double real, imag;
};
struct value {
enum DATA_TYPES type;
union {
int int_val;
struct cmplx cmplx_val;
} v;
};
struct lexical_unit { /* produced by scanner */
BOOLEAN is_token; /* true if token, false if a value */
struct value l_val;
int start_index; /* index of first char in token */
int length; /* length of token in chars */
};
struct ft_entry { /* standard/internal function table entry */
char *f_name; /* pointer to name of this function */
FUNC_PTR func; /* address of function to call */
};
struct udft_entry { /* user-defined function table entry */
struct udft_entry *next_udf; /* pointer to next udf in linked list */
char udf_name[MAX_ID_LEN+1]; /* name of this function entry */
struct at_type *at; /* pointer to action table to execute */
char *definition; /* definition of function as typed */
struct value dummy_value; /* current value of dummy variable */
};
struct udvt_entry { /* user-defined value table entry */
struct udvt_entry *next_udv; /* pointer to next value in linked list */
char udv_name[MAX_ID_LEN+1]; /* name of this value entry */
BOOLEAN udv_undef; /* true if not defined yet */
struct value udv_value; /* value it has */
};
union argument { /* p-code argument */
int j_arg; /* offset for jump */
struct value v_arg; /* constant value */
struct udvt_entry *udv_arg; /* pointer to dummy variable */
struct udft_entry *udf_arg; /* pointer to udf to execute */
};
struct at_entry { /* action table entry */
enum operators index; /* index of p-code function */
union argument arg;
};
struct at_type {
int a_count; /* count of entries in .actions[] */
struct at_entry actions[MAX_AT_LEN];
/* will usually be less than MAX_AT_LEN is malloc()'d copy */
};
/* Defines the type of a coordinate */
/* INRANGE and OUTRANGE points have an x,y point associated with them */
enum coord_type {
INRANGE, /* inside plot boundary */
OUTRANGE, /* outside plot boundary, but defined */
UNDEFINED /* not defined at all */
};
struct coordinate {
enum coord_type type; /* see above */
#ifdef PC
float x, y; /* memory is tight on PCs! */
#else
double x, y;
#endif /* PC */
};
struct curve_points {
struct curve_points *next_cp; /* pointer to next plot in linked list */
enum PLOT_TYPE plot_type;
enum PLOT_STYLE plot_style;
char *title;
int line_type;
int point_type;
int p_count; /* count of points in .points[] */
struct coordinate points[MAX_POINTS];
/* will usually be less in malloc()'d copy */
};
struct termentry {
char *name;
char *description;
unsigned int xmax,ymax,v_char,h_char,v_tic,h_tic;
FUNC_PTR init,reset,text,scale,graphics,move,vector,linetype,
put_text,text_angle,justify_text,point,arrow;
};
struct text_label {
struct text_label *next; /* pointer to next label in linked list */
int tag; /* identifies the label */
double x,y;
enum JUSTIFY pos;
char text[MAX_LINE_LEN+1];
};
struct arrow_def {
struct arrow_def *next; /* pointer to next arrow in linked list */
int tag; /* identifies the arrow */
double sx,sy; /* start position */
double ex,ey; /* end position */
};
/* Tic-mark labelling definition; see set xtics */
struct ticdef {
int type; /* one of three values below */
#define TIC_COMPUTED 1 /* default; gnuplot figures them */
#define TIC_SERIES 2 /* user-defined series */
#define TIC_USER 3 /* user-defined points */
union {
struct { /* for TIC_SERIES */
double start, incr;
double end; /* ymax, if VERYLARGE */
} series;
struct ticmark *user; /* for TIC_USER */
} def;
};
/* Defines one ticmark for TIC_USER style.
* If label==NULL, the value is printed with the usual format string.
* else, it is used as the format string (note that it may be a constant
* string, like "high" or "low").
*/
struct ticmark {
double position; /* where on axis is this */
char *label; /* optional (format) string label */
struct ticmark *next; /* linked list */
};
/*
* SS$_NORMAL is "normal completion", STS$M_INHIB_MSG supresses
* printing a status message.
* SS$_ABORT is the general abort status code.
from: Martin Minow
decvax!minow
*/
#ifdef vms
#include <ssdef.h>
#include <stsdef.h>
#define IO_SUCCESS (SS$_NORMAL | STS$M_INHIB_MSG)
#define IO_ERROR SS$_ABORT
#endif /* vms */
#ifndef IO_SUCCESS /* DECUS or VMS C will have defined these already */
#define IO_SUCCESS 0
#endif
#ifndef IO_ERROR
#define IO_ERROR 1
#endif
/* Some key global variables */
extern BOOLEAN screen_ok;
extern BOOLEAN term_init;
extern BOOLEAN undefined;
extern struct termentry term_tbl[];
extern char *alloc();