/* $Id: plplot.h,v 1.154 2004/06/14 21:51:57 rlaboiss Exp $

    Macros and prototypes for the PLplot package.  This header file must
    be included by all user codes.

    Note: some systems allow the Fortran & C namespaces to clobber each
    other.  So for PLplot to work from Fortran, we do some rather nasty
    things to the externally callable C function names.  This shouldn't
    affect any user programs in C as long as this file is included.

    Copyright (C) 1992  Maurice J. LeBrun, Geoff Furnish, Tony Richardson.
    Copyright (C) 2004  Alan W. Irwin
    Copyright (C) 2004  Rafael Laboissiere
    Copyright (C) 2004  Andrew Ross

    This file is part of PLplot.

    PLplot is free software; you can redistribute it and/or modify
    it under the terms of the GNU Library General Public License as published
    by the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    PLplot 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 Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with PLplot; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/

#ifndef __PLPLOT_H__
#define __PLPLOT_H__

#include "plConfig.h"

/*--------------------------------------------------------------------------*\
 *    USING PLplot
 *
 * To use PLplot from C or C++, it is only necessary to
 *
 *      #include "plplot.h"
 *
 * This file does all the necessary setup to make PLplot accessible to
 * your program as documented in the manual.  Additionally, this file
 * allows you to request certain behavior by defining certain symbols
 * before inclusion.  At the moment the only one is:
 *
 * #define DOUBLE	or..
 * #define PL_DOUBLE
 *
 * This causes PLplot to use doubles instead of floats.  Use the type
 * PLFLT everywhere in your code, and it will always be the right thing.
 *
 * Note: most of the functions visible here begin with "pl", while all
 * of the data types and switches begin with "PL".  Eventually everything
 * will conform to this rule in order to keep namespace pollution of the
 * user code to a minimum.  All the PLplot source files actually include
 * "plplotP.h", which includes this file as well as all the internally-
 * visible declarations, etc.
\*--------------------------------------------------------------------------*/

/* The majority of PLplot source files require these, so.. */
/* Under ANSI C, they can be included any number of times. */

#include <stdio.h>
#include <stdlib.h>

/*--------------------------------------------------------------------------*\
 *        SYSTEM IDENTIFICATION
 *
 * Several systems are supported directly by PLplot.  In order to avoid
 * confusion, one id macro per system is used.  Since different compilers
 * may predefine different system id macros, we need to check all the
 * possibilities, and then set the one we will be referencing.  These are:
 *
 * __cplusplus                Any C++ compiler
 * __unix                     Any Unix-like system
 * __hpux                     Any HP/UX system
 * __aix                      Any AIX system
 * __linux                    Linux for i386
 * (others...)
 *
\*--------------------------------------------------------------------------*/

#ifdef unix			/* the old way */
#ifndef __unix
#define __unix
#endif
#endif

/* Make sure Unix systems define "__unix" */

#if defined(SX)	||				/* NEC Super-UX */      \
    (defined(_IBMR2) && defined(_AIX)) ||	/* AIX */               \
    defined(__hpux) ||				/* HP/UX */             \
    defined(sun) ||				/* SUN */               \
    defined(CRAY) ||				/* Cray */              \
    defined(__convexc__) ||			/* CONVEX */            \
    (defined(__alpha) && defined(__osf__))	/* DEC Alpha AXP/OSF */

#ifndef __unix
#define __unix
#endif
#endif

/* A wrapper used in some header files so they can be compiled with cc */

#define PLARGS(a)	a

/*--------------------------------------------------------------------------*\
 * Base types for PLplot
 *
 * Only those that are necessary for function prototypes are defined here.
 * Notes:
 *
 * PLINT is typedef'd to an int by default.  This is a change from some
 * previous versions, where a long was used.  Under MSDOS, a PLINT is
 * typedef'd to a long, since 16 bits is too inaccurate for some PLplot
 * functions.  So under MSDOS you must use type PLINT for integer array
 * arguments to PLplot functions, but on other systems you can just use
 * an int.
 *
 * short is currently used for device page coordinates, so they are
 * bounded by (-32767, 32767).  This gives a max resolution of about 3000
 * dpi, and improves performance in some areas over using a PLINT.
\*--------------------------------------------------------------------------*/

#if defined(PL_DOUBLE) || defined(DOUBLE)
typedef double PLFLT;
#define PLFLT_MAX DBL_MAX
#define PLFLT_MIN DBL_MIN
#else
typedef float PLFLT;
#define PLFLT_MAX  FLT_MAX
#define PLFLT_MIN  FLT_MIN
#endif

#if defined(MSDOS) && !defined(__WIN32__)
typedef long PLINT;
#else
typedef int PLINT;
#endif

/* For passing user data, as with X's XtPointer */

typedef void* PLPointer;

/*--------------------------------------------------------------------------*\
 * Complex data types and other good stuff
\*--------------------------------------------------------------------------*/

/* Switches for escape function call. */
/* Some of these are obsolete but are retained in order to process
   old metafiles */

#define PLESC_SET_RGB		1	/* obsolete */
#define PLESC_ALLOC_NCOL	2	/* obsolete */
#define PLESC_SET_LPB		3	/* obsolete */
#define PLESC_EXPOSE		4	/* handle window expose */
#define PLESC_RESIZE		5	/* handle window resize */
#define PLESC_REDRAW		6	/* handle window redraw */
#define PLESC_TEXT		7	/* switch to text screen */
#define PLESC_GRAPH		8	/* switch to graphics screen */
#define PLESC_FILL		9	/* fill polygon */
#define PLESC_DI		10	/* handle DI command */
#define PLESC_FLUSH		11	/* flush output */
#define PLESC_EH		12      /* handle Window events */
#define PLESC_GETC		13	/* get cursor position */
#define PLESC_SWIN		14	/* set window parameters */
#define PLESC_DOUBLEBUFFERING	15	/* configure double buffering */
#define PLESC_XORMOD		16	/* set xor mode */
#define PLESC_SET_COMPRESSION	17	/* AFR: set compression */
#define PLESC_CLEAR		18      /* RL: clear graphics region */
#define PLESC_DASH		19	/* RL: draw dashed line */
#define PLESC_HAS_TEXT		20	/* driver draws text */
#define PLESC_IMAGE		21	/* handle image */
#define PLESC_IMAGEOPS          22      /* plimage related operations */
#define PLESC_PL2DEVCOL		23	/* convert PLColor to device color */
#define PLESC_DEV2PLCOL		24	/* convert device color to PLColor */
#define PLESC_SETBGFG		25	/* set BG, FG colors */
#define PLESC_DEVINIT		26	/* alternate device initialization */

/* image operations */
#define ZEROW2B   1
#define ZEROW2D   2
#define ONEW2B    3
#define ONEW2D    4

/* Window parameter tags */

#define PLSWIN_DEVICE		1	/* device coordinates */
#define PLSWIN_WORLD		2	/* world coordinates */

/* PLplot Option table & support constants */

/* Option-specific settings */

#define PL_OPT_ENABLED		0x0001	/* Obsolete */
#define PL_OPT_ARG		0x0002	/* Option has an argment */
#define PL_OPT_NODELETE		0x0004	/* Don't delete after processing */
#define PL_OPT_INVISIBLE	0x0008	/* Make invisible */
#define PL_OPT_DISABLED		0x0010	/* Processing is disabled */

/* Option-processing settings -- mutually exclusive */

#define PL_OPT_FUNC		0x0100	/* Call handler function */
#define PL_OPT_BOOL		0x0200	/* Set *var = 1 */
#define PL_OPT_INT		0x0400	/* Set *var = atoi(optarg) */
#define PL_OPT_FLOAT		0x0800	/* Set *var = atof(optarg) */
#define PL_OPT_STRING		0x1000	/* Set var = optarg */

/* Global mode settings */
/* These override per-option settings */

#define PL_PARSE_PARTIAL	0x0000	/* For backward compatibility */
#define PL_PARSE_FULL		0x0001	/* Process fully & exit if error */
#define PL_PARSE_QUIET		0x0002	/* Don't issue messages */
#define PL_PARSE_NODELETE	0x0004	/* Don't delete options after */
					/* processing */
#define PL_PARSE_SHOWALL	0x0008	/* Show invisible options */
#define PL_PARSE_OVERRIDE	0x0010	/* Obsolete */
#define PL_PARSE_NOPROGRAM	0x0020	/* Program name NOT in *argv[0].. */
#define PL_PARSE_NODASH		0x0040	/* Set if leading dash NOT required */
#define PL_PARSE_SKIP		0x0080	/* Skip over unrecognized args */

/* Obsolete names */

#define plParseInternalOpts(a, b, c)	plParseOpts(a, b, c)
#define plSetInternalOpt(a, b)		plSetOpt(a, b)

/* Option table definition */

typedef struct {
    char *opt;
    int  (*handler)	(char *, char *, void *);
    void *client_data;
    void *var;
    long mode;
    char *syntax;
    char *desc;
} PLOptionTable;

/* PLplot Graphics Input structure */

#define PL_MAXKEY 16

typedef struct {
    int type;			/* of event (CURRENTLY UNUSED) */
    unsigned int state;		/* key or button mask */
    unsigned int keysym;	/* key selected */
    unsigned int button;	/* mouse button selected */
    PLINT subwindow;            /* subwindow (alias subpage, alias subplot) number */
    char string[PL_MAXKEY];	/* translated string */
    int pX, pY;			/* absolute device coordinates of pointer */
    PLFLT dX, dY;		/* relative device coordinates of pointer */
    PLFLT wX, wY;		/* world coordinates of pointer */
} PLGraphicsIn;

/* Structure for describing the plot window */

#define PL_MAXWINDOWS	64	/* Max number of windows/page tracked */

typedef struct {
    PLFLT dxmi, dxma, dymi, dyma;	/* min, max window rel dev coords */
    PLFLT wxmi, wxma, wymi, wyma;	/* min, max window world coords */
} PLWindow;

/* Structure for doing display-oriented operations via escape commands */
/* May add other attributes in time */

typedef struct {
    unsigned int x, y;			/* upper left hand corner */
    unsigned int width, height;		/* window dimensions */
} PLDisplay;

/* Macro used (in some cases) to ignore value of argument */
/* I don't plan on changing the value so you can hard-code it */

#define PL_NOTSET (-42)

/* See plcont.c for examples of the following */

/*
 * PLfGrid is for passing (as a pointer to the first element) an arbitrarily
 * dimensioned array.  The grid dimensions MUST be stored, with a maximum of 3
 * dimensions assumed for now.
 */

typedef struct {
    PLFLT *f;
    PLINT nx, ny, nz;
} PLfGrid;

/*
 * PLfGrid2 is for passing (as an array of pointers) a 2d function array.  The
 * grid dimensions are passed for possible bounds checking.
 */

typedef struct {
    PLFLT **f;
    PLINT nx, ny;
} PLfGrid2;

/*
 * NOTE: a PLfGrid3 is a good idea here but there is no way to exploit it yet
 * so I'll leave it out for now.
 */

/*
 * PLcGrid is for passing (as a pointer to the first element) arbitrarily
 * dimensioned coordinate transformation arrays.  The grid dimensions MUST be
 * stored, with a maximum of 3 dimensions assumed for now.
 */

typedef struct {
    PLFLT *xg, *yg, *zg;
    PLINT nx, ny, nz;
} PLcGrid;

/*
 * PLcGrid2 is for passing (as arrays of pointers) 2d coordinate
 * transformation arrays.  The grid dimensions are passed for possible bounds
 * checking.
 */

typedef struct {
    PLFLT **xg, **yg, **zg;
    PLINT nx, ny;
} PLcGrid2;

/*
 * NOTE: a PLcGrid3 is a good idea here but there is no way to exploit it yet
 * so I'll leave it out for now.
 */

/* PLColor is the usual way to pass an rgb color value. */

typedef struct {
    unsigned char r;		/* red */
    unsigned char g;		/* green */
    unsigned char b;		/* blue */
    char *name;
} PLColor;

/* PLControlPt is how cmap1 control points are represented. */

typedef struct {
    PLFLT h;			/* hue */
    PLFLT l;			/* lightness */
    PLFLT s;			/* saturation */
    PLFLT p;			/* position */
    int rev;			/* if set, interpolate through h=0 */
} PLControlPt;

/* A PLBufferingCB is a control block for interacting with devices
   that support double buffering. */

typedef struct {
    PLINT cmd;
    PLINT result;
} PLBufferingCB;

#define PLESC_DOUBLEBUFFERING_ENABLE     1
#define PLESC_DOUBLEBUFFERING_DISABLE    2
#define PLESC_DOUBLEBUFFERING_QUERY      3


/*--------------------------------------------------------------------------*\
 *		BRAINDEAD-ness
 *
 * Some systems allow the Fortran & C namespaces to clobber each other.
 * For PLplot to work from Fortran on these systems, we must name the the
 * externally callable C functions something other than their Fortran entry
 * names.  In order to make this as easy as possible for the casual user,
 * yet reversible to those who abhor my solution, I have done the
 * following:
 *
 *	The C-language bindings are actually different from those
 *	described in the manual.  Macros are used to convert the
 *	documented names to the names used in this package.  The
 *	user MUST include plplot.h in order to get the name
 *	redefinition correct.
 *
 * Sorry to have to resort to such an ugly kludge, but it is really the
 * best way to handle the situation at present.  If all available
 * compilers offer a way to correct this stupidity, then perhaps we can
 * eventually reverse it.
 *
 * If you feel like screaming at someone (I sure do), please
 * direct it at your nearest system vendor who has a braindead shared
 * C/Fortran namespace.  Some vendors do offer compiler switches that
 * change the object names, but then everybody who wants to use the
 * package must throw these same switches, leading to no end of trouble.
 *
 * Note that this definition should not cause any noticable effects except
 * when debugging PLplot calls, in which case you will need to remember
 * the real function names (same as before but with a 'c_' prepended).
 *
 * Also, to avoid macro conflicts, the BRAINDEAD part must not be expanded
 * in the stub routines.
 *
 * Aside: the reason why a shared Fortran/C namespace is deserving of the
 * BRAINDEAD characterization is that it completely precludes the the kind
 * of universal API that is attempted (more or less) with PLplot, without
 * Herculean efforts (e.g. remapping all of the C bindings by macros as
 * done here).  The vendors of such a scheme, in order to allow a SINGLE
 * type of argument to be passed transparently between C and Fortran,
 * namely, a pointer to a conformable data type, have slammed the door on
 * insertion of stub routines to handle the conversions needed for other
 * data types.  Intelligent linkers could solve this problem, but these are
 * not anywhere close to becoming universal.  So meanwhile, one must live
 * with either stub routines for the inevitable data conversions, or a
 * different API.  The former is what is used here, but is made far more
 * difficult in a braindead shared Fortran/C namespace.
\*--------------------------------------------------------------------------*/

#ifndef BRAINDEAD
#define BRAINDEAD
#endif

#ifdef BRAINDEAD

#ifndef __PLSTUBS_H__	/* i.e. do not expand this in the stubs */

#define    pl_setcontlabelformat c_pl_setcontlabelformat
#define    pl_setcontlabelparam c_pl_setcontlabelparam
#define    pladv	c_pladv
#define    plaxes	c_plaxes
#define    plbin	c_plbin
#define    plbop	c_plbop
#define    plbox	c_plbox
#define    plbox3	c_plbox3
#define    plcalc_world	c_plcalc_world
#define    plclear	c_plclear
#define    plcol0	c_plcol0
#define    plcol1	c_plcol1
#define    plcont	c_plcont
#define    plcpstrm	c_plcpstrm
#define    plend	c_plend
#define    plend1	c_plend1
#define    plenv	c_plenv
#define    plenv0	c_plenv0
#define    pleop	c_pleop
#define    plerrx	c_plerrx
#define    plerry	c_plerry
#define    plfamadv	c_plfamadv
#define    plfill	c_plfill
#define    plfill3	c_plfill3
#define    plflush	c_plflush
#define    plfont	c_plfont
#define    plfontld	c_plfontld
#define    plgchr	c_plgchr
#define    plgcol0	c_plgcol0
#define    plgcolbg	c_plgcolbg
#define    plgcompression	c_plgcompression
#define    plgdev	c_plgdev
#define    plgdidev	c_plgdidev
#define    plgdiori	c_plgdiori
#define    plgdiplt	c_plgdiplt
#define    plgfam	c_plgfam
#define    plgfnam	c_plgfnam
#define    plglevel	c_plglevel
#define    plgpage	c_plgpage
#define    plgra	c_plgra
#define    plgriddata   c_plgriddata
#define    plgspa	c_plgspa
#define    plgstrm	c_plgstrm
#define    plgver	c_plgver
#define    plgvpd	c_plgvpd
#define    plgvpw	c_plgvpw
#define    plgxax	c_plgxax
#define    plgyax	c_plgyax
#define    plgzax	c_plgzax
#define    plhist	c_plhist
#define    plhls        c_plhls
#define    plinit	c_plinit
#define    pljoin	c_pljoin
#define    pllab	c_pllab
#define    pllightsource	c_pllightsource
#define    plline	c_plline
#define    plline3	c_plline3
#define    pllsty	c_pllsty
#define    plmesh	c_plmesh
#define    plmeshc	c_plmeshc
#define    plmkstrm	c_plmkstrm
#define    plmtex	c_plmtex
#define    plot3d	c_plot3d
#define    plot3dc	c_plot3dc
#define    plot3dcl	c_plot3dcl
#define    plpat	c_plpat
#define    plpoin	c_plpoin
#define    plpoin3	c_plpoin3
#define    plpoly3	c_plpoly3
#define    plprec	c_plprec
#define    plpsty	c_plpsty
#define    plptex	c_plptex
#define    plreplot	c_plreplot
#define    plrgb	c_plrgb
#define    plrgb1	c_plrgb1
#define    plschr	c_plschr
#define    plscmap0	c_plscmap0
#define    plscmap0n	c_plscmap0n
#define    plscmap1	c_plscmap1
#define    plscmap1l	c_plscmap1l
#define    plscmap1n	c_plscmap1n
#define    plscol0	c_plscol0
#define    plscolbg	c_plscolbg
#define    plscolor	c_plscolor
#define    plscompression	c_plscompression
#define    plsdev	c_plsdev
#define    plsdidev	c_plsdidev
#define    plsdimap	c_plsdimap
#define    plsdiori	c_plsdiori
#define    plsdiplt	c_plsdiplt
#define    plsdiplz	c_plsdiplz
#define    plsesc	c_plsesc
#define    plsetopt	c_plsetopt
#define    plsfam	c_plsfam
#define    plsfnam	c_plsfnam
#define    plshade	c_plshade
#define    plshade1	c_plshade1
#define    plshades	c_plshades
#define    plsmaj	c_plsmaj
#define    plsmem	c_plsmem
#define    plsmin	c_plsmin
#define    plsori	c_plsori
#define    plspage	c_plspage
#define    plspause	c_plspause
#define    plsstrm	c_plsstrm
#define    plssub	c_plssub
#define    plssym	c_plssym
#define    plstar	c_plstar
#define    plstart	c_plstart
#define    plstripa	c_plstripa
#define    plstripc	c_plstripc
#define    plstripd	c_plstripd
#define    plstyl	c_plstyl
#define    plsurf3d	c_plsurf3d
#define    plsurf3dl	c_plsurf3dl
#define    plsvect      c_plsvect
#define    plsvpa	c_plsvpa
#define    plsxax	c_plsxax
#define    plsyax	c_plsyax
#define    plsym	c_plsym
#define    plszax	c_plszax
#define    pltext	c_pltext
#define    plvasp	c_plvasp
#define    plvect	c_plvect
#define    plvpas	c_plvpas
#define    plvpor	c_plvpor
#define    plvsta	c_plvsta
#define    plw3d	c_plw3d
#define    plwid	c_plwid
#define    plwind	c_plwind
#define    plxormod	c_plxormod

#endif /* __PLSTUBS_H__ */

#endif	/* BRAINDEAD */

/* Redefine some old function names for backward compatibility */

#ifndef __PLSTUBS_H__	/* i.e. do not expand this in the stubs */

#define    plclr	pleop
#define    plpage	plbop
#define    plcol	plcol0
#define    plcontf	plfcont
#define	   Alloc2dGrid	plAlloc2dGrid
#define	   Free2dGrid	plFree2dGrid
#define    MinMax2dGrid plMinMax2dGrid
#define    plP_gvpd	plgvpd
#define    plP_gvpw	plgvpw
#define    plotsh3d(x,y,z,nx,ny,opt)     plsurf3d(x,y,z,nx,ny,opt, NULL, 0)

#endif /* __PLSTUBS_H__ */

/*--------------------------------------------------------------------------*\
 *		Function Prototypes
\*--------------------------------------------------------------------------*/

#ifdef __cplusplus
extern "C" {
#endif

	/* All void types */

	/* C routines callable from stub routines come first */

/* set the format of the contour labels */

void
c_pl_setcontlabelformat(PLINT lexp, PLINT sigdig);

/* set offset and spacing of contour labels */

void
c_pl_setcontlabelparam(PLFLT offset, PLFLT size, PLFLT spacing, PLINT active);

/* Advance to subpage "page", or to the next one if "page" = 0. */

void
c_pladv(PLINT page);

/* simple arrow plotter. */

void
plarrows(PLFLT *u, PLFLT *v, PLFLT *x, PLFLT *y, PLINT n,
         PLFLT scale, PLFLT dx, PLFLT dy) ;

void
c_plvect(PLFLT **u, PLFLT **v, PLINT nx, PLINT ny, PLFLT scale,
void (*pltr) (PLFLT, PLFLT, PLFLT *, PLFLT *, PLPointer),
              PLPointer pltr_data);

void
c_plsvect(PLFLT *arrowx, PLFLT *arrowy, PLINT npts, PLINT fill);

/* This functions similarly to plbox() except that the origin of the axes */
/* is placed at the user-specified point (x0, y0). */

void
c_plaxes(PLFLT x0, PLFLT y0, const char *xopt, PLFLT xtick, PLINT nxsub,
	 const char *yopt, PLFLT ytick, PLINT nysub);

/* Plot a histogram using x to store data values and y to store frequencies */

void
c_plbin(PLINT nbin, PLFLT *x, PLFLT *y, PLINT center);

/* Start new page.  Should only be used with pleop(). */

void
c_plbop(void);

/* This draws a box around the current viewport. */

void
c_plbox(const char *xopt, PLFLT xtick, PLINT nxsub,
	const char *yopt, PLFLT ytick, PLINT nysub);

/* This is the 3-d analogue of plbox(). */

void
c_plbox3(const char *xopt, const char *xlabel, PLFLT xtick, PLINT nsubx,
	 const char *yopt, const char *ylabel, PLFLT ytick, PLINT nsuby,
	 const char *zopt, const char *zlabel, PLFLT ztick, PLINT nsubz);

/* Calculate world coordinates and subpage from relative device coordinates. */

void
c_plcalc_world(PLFLT rx, PLFLT ry, PLFLT *wx, PLFLT *wy, PLINT *window);

/* Clear current subpage. */

void
c_plclear(void);

/* Set color, map 0.  Argument is integer between 0 and 15. */

void
c_plcol0(PLINT icol0);

/* Set color, map 1.  Argument is a float between 0. and 1. */

void
c_plcol1(PLFLT col1);

/* Draws a contour plot from data in f(nx,ny).  Is just a front-end to
 * plfcont, with a particular choice for f2eval and f2eval_data.
 */

void
c_plcont(PLFLT **f, PLINT nx, PLINT ny, PLINT kx, PLINT lx,
	 PLINT ky, PLINT ly, PLFLT *clevel, PLINT nlevel,
	 void (*pltr) (PLFLT, PLFLT, PLFLT *, PLFLT *, PLPointer),
	 PLPointer pltr_data);

/* Draws a contour plot using the function evaluator f2eval and data stored
 * by way of the f2eval_data pointer.  This allows arbitrary organizations
 * of 2d array data to be used.
 */

void
plfcont(PLFLT (*f2eval) (PLINT, PLINT, PLPointer),
	PLPointer f2eval_data,
	PLINT nx, PLINT ny, PLINT kx, PLINT lx,
	PLINT ky, PLINT ly, PLFLT *clevel, PLINT nlevel,
	void (*pltr) (PLFLT, PLFLT, PLFLT *, PLFLT *, PLPointer),
	PLPointer pltr_data);

/* Copies state parameters from the reference stream to the current stream. */

void
c_plcpstrm(PLINT iplsr, PLINT flags);

/* Converts input values from relative device coordinates to relative plot */
/* coordinates. */

void
pldid2pc(PLFLT *xmin, PLFLT *ymin, PLFLT *xmax, PLFLT *ymax);

/* Converts input values from relative plot coordinates to relative */
/* device coordinates. */

void
pldip2dc(PLFLT *xmin, PLFLT *ymin, PLFLT *xmax, PLFLT *ymax);

/* End a plotting session for all open streams. */

void
c_plend(void);

/* End a plotting session for the current stream only. */

void
c_plend1(void);

/* Simple interface for defining viewport and window. */

void
c_plenv(PLFLT xmin, PLFLT xmax, PLFLT ymin, PLFLT ymax,
	PLINT just, PLINT axis);


/* similar to plenv() above, but in multiplot mode does not advance the subpage,
 instead the current subpage is cleared */

void
c_plenv0(PLFLT xmin, PLFLT xmax, PLFLT ymin, PLFLT ymax,
	PLINT just, PLINT axis);

/* End current page.  Should only be used with plbop(). */

void
c_pleop(void);

/* Plot horizontal error bars (xmin(i),y(i)) to (xmax(i),y(i)) */

void
c_plerrx(PLINT n, PLFLT *xmin, PLFLT *xmax, PLFLT *y);

/* Plot vertical error bars (x,ymin(i)) to (x(i),ymax(i)) */

void
c_plerry(PLINT n, PLFLT *x, PLFLT *ymin, PLFLT *ymax);

/* Advance to the next family file on the next new page */

void
c_plfamadv(void);

/* Pattern fills the polygon bounded by the input points. */

void
c_plfill(PLINT n, PLFLT *x, PLFLT *y);

/* Pattern fills the 3d polygon bounded by the input points. */

void
c_plfill3(PLINT n, PLFLT *x, PLFLT *y, PLFLT *z);

/* Flushes the output stream.  Use sparingly, if at all. */

void
c_plflush(void);

/* Sets the global font flag to 'ifont'. */

void
c_plfont(PLINT ifont);

/* Load specified font set. */

void
c_plfontld(PLINT fnt);

/* Get character default height and current (scaled) height */

void
c_plgchr(PLFLT *p_def, PLFLT *p_ht);

/* Returns 8 bit RGB values for given color from color map 0 */

void
c_plgcol0(PLINT icol0, PLINT *r, PLINT *g, PLINT *b);

/* Returns the background color by 8 bit RGB value */

void
c_plgcolbg(PLINT *r, PLINT *g, PLINT *b);

/* Returns the current compression setting */

void
c_plgcompression(PLINT *compression);

/* Get the current device (keyword) name */

void
c_plgdev(char *p_dev);

/* Retrieve current window into device space */

void
c_plgdidev(PLFLT *p_mar, PLFLT *p_aspect, PLFLT *p_jx, PLFLT *p_jy);

/* Get plot orientation */

void
c_plgdiori(PLFLT *p_rot);

/* Retrieve current window into plot space */

void
c_plgdiplt(PLFLT *p_xmin, PLFLT *p_ymin, PLFLT *p_xmax, PLFLT *p_ymax);

/* Get family file parameters */

void
c_plgfam(PLINT *p_fam, PLINT *p_num, PLINT *p_bmax);

/* Get the (current) output file name.  Must be preallocated to >80 bytes */

void
c_plgfnam(char *fnam);

/* Get the (current) run level.  */

void
c_plglevel(PLINT *p_level);

/* Get output device parameters. */

void
c_plgpage(PLFLT *p_xp, PLFLT *p_yp,
	  PLINT *p_xleng, PLINT *p_yleng, PLINT *p_xoff, PLINT *p_yoff);

/* Switches to graphics screen. */

void
c_plgra(void);

  /* grid irregularly sampled data */

void
c_plgriddata(PLFLT *x, PLFLT *y, PLFLT *z, PLINT npts,
	   PLFLT *xg, PLINT nptsx, PLFLT *yg,  PLINT nptsy,
	   PLFLT **zg, PLINT type, PLFLT data);

  /* type of gridding algorithm for plgriddata() */

#define GRID_CSA    1 /* Bivariate Cubic Spline approximation */
#define GRID_DTLI   2 /* Delaunay Triangulation Linear Interpolation */
#define GRID_NNI    3 /* Natural Neighbors Interpolation */
#define GRID_NNIDW  4 /* Nearest Neighbors Inverse Distance Weighted */
#define GRID_NNLI   5 /* Nearest Neighbors Linear Interpolation */
#define GRID_NNAIDW 6 /* Nearest Neighbors Around Inverse Distance Weighted  */

/* Get subpage boundaries in absolute coordinates */

void
c_plgspa(PLFLT *xmin, PLFLT *xmax, PLFLT *ymin, PLFLT *ymax);

/* Get current stream number. */

void
c_plgstrm(PLINT *p_strm);

/* Get the current library version number */

void
c_plgver(char *p_ver);

/* Get viewport boundaries in normalized device coordinates */

void
c_plgvpd(PLFLT *p_xmin, PLFLT *p_xmax, PLFLT *p_ymin, PLFLT *p_ymax);

/* Get viewport boundaries in world coordinates */

void
c_plgvpw(PLFLT *p_xmin, PLFLT *p_xmax, PLFLT *p_ymin, PLFLT *p_ymax);

/* Get x axis labeling parameters */

void
c_plgxax(PLINT *p_digmax, PLINT *p_digits);

/* Get y axis labeling parameters */

void
c_plgyax(PLINT *p_digmax, PLINT *p_digits);

/* Get z axis labeling parameters */

void
c_plgzax(PLINT *p_digmax, PLINT *p_digits);

/* Draws a histogram of n values of a variable in array data[0..n-1] */

void
c_plhist(PLINT n, PLFLT *data, PLFLT datmin, PLFLT datmax,
	 PLINT nbin, PLINT oldwin);

/* Set current color (map 0) by hue, lightness, and saturation. */

void
c_plhls(PLFLT h, PLFLT l, PLFLT s);

/* Initializes PLplot, using preset or default options */

void
c_plinit(void);

/* Draws a line segment from (x1, y1) to (x2, y2). */

void
c_pljoin(PLFLT x1, PLFLT y1, PLFLT x2, PLFLT y2);

/* Simple routine for labelling graphs. */

void
c_pllab(const char *xlabel, const char *ylabel, const char *tlabel);

/* Sets position of the light source */
void
c_pllightsource(PLFLT x, PLFLT y, PLFLT z);

/* Draws line segments connecting a series of points. */

void
c_plline(PLINT n, PLFLT *x, PLFLT *y);

/* Draws a line in 3 space.  */

void
c_plline3(PLINT n, PLFLT *x, PLFLT *y, PLFLT *z);

/* Set line style. */

void
c_pllsty(PLINT lin);

/* plot continental outline in world coordinates */

void
plmap( void (*mapform)(PLINT, PLFLT *, PLFLT *), char *type,
         PLFLT minlong, PLFLT maxlong, PLFLT minlat, PLFLT maxlat );

/* Plot the latitudes and longitudes on the background. */

void
plmeridians( void (*mapform)(PLINT, PLFLT *, PLFLT *),
               PLFLT dlong, PLFLT dlat,
               PLFLT minlong, PLFLT maxlong, PLFLT minlat, PLFLT maxlat );

/* Plots a mesh representation of the function z[x][y]. */

void
c_plmesh(PLFLT *x, PLFLT *y, PLFLT **z, PLINT nx, PLINT ny, PLINT opt);

/* Plots a mesh representation of the function z[x][y] with contour */

void
c_plmeshc(PLFLT *x, PLFLT *y, PLFLT **z, PLINT nx, PLINT ny, PLINT opt,
	  PLFLT *clevel, PLINT nlevel);

/* Creates a new stream and makes it the default.  */

void
c_plmkstrm(PLINT *p_strm);

/* Prints out "text" at specified position relative to viewport */

void
c_plmtex(const char *side, PLFLT disp, PLFLT pos, PLFLT just,
	 const char *text);

/* Plots a 3-d representation of the function z[x][y]. */

void
c_plot3d(PLFLT *x, PLFLT *y, PLFLT **z,
	 PLINT nx, PLINT ny, PLINT opt, PLINT side);

/* Plots a 3-d representation of the function z[x][y] with contour. */

void
c_plot3dc(PLFLT *x, PLFLT *y, PLFLT **z,
	 PLINT nx, PLINT ny, PLINT opt,
	 PLFLT *clevel, PLINT nlevel);

/* Plots a 3-d representation of the function z[x][y] with contour and
 * y index limits. */

void
c_plot3dcl(PLFLT *x, PLFLT *y, PLFLT **z,
	 PLINT nx, PLINT ny, PLINT opt,
	 PLFLT *clevel, PLINT nlevel, 
	 PLINT ixstart, PLINT ixn, PLINT *indexymin, PLINT*indexymax);

/*
 * definitions for the opt argument in plot3dc() and plsurf3d()
 *
 * DRAW_LINEX *must* be 1 and DRAW_LINEY *must* be 2, because of legacy code!
 */

#define DRAW_LINEX  (1 << 0) /* draw lines parallel to the X axis */
#define DRAW_LINEY  (1 << 1) /* draw lines parallel to the Y axis */
#define DRAW_LINEXY (DRAW_LINEX | DRAW_LINEY) /* draw lines parallel to both the X and Y axis */
#define MAG_COLOR   (1 << 2) /* draw the mesh with a color dependent of the magnitude */
#define BASE_CONT   (1 << 3) /* draw contour plot at bottom xy plane */
#define TOP_CONT    (1 << 4) /* draw contour plot at top xy plane */
#define SURF_CONT   (1 << 5) /* draw contour plot at surface */
#define DRAW_SIDES  (1 << 6) /* draw sides */
#define FACETED     (1 << 7) /* draw outline for each square that makes up the surface */
#define MESH        (1 << 8) /* draw mesh */

  /*
   *  valid options for plot3dc():
   *
   *  DRAW_SIDES, BASE_CONT, TOP_CONT (not yet),
   *  MAG_COLOR, DRAW_LINEX, DRAW_LINEY, DRAW_LINEXY.
   *
   *  valid options for plsurf3d():
   *
   *  MAG_COLOR, BASE_CONT, SURF_CONT, FACETED, DRAW_SIDES.
   */

/* Set fill pattern directly. */

void
c_plpat(PLINT nlin, PLINT *inc, PLINT *del);

/* Plots array y against x for n points using ASCII code "code".*/

void
c_plpoin(PLINT n, PLFLT *x, PLFLT *y, PLINT code);

/* Draws a series of points in 3 space. */

void
c_plpoin3(PLINT n, PLFLT *x, PLFLT *y, PLFLT *z, PLINT code);

/* Draws a polygon in 3 space.  */

void
c_plpoly3(PLINT n, PLFLT *x, PLFLT *y, PLFLT *z, PLINT *draw, PLINT ifcc);

/* Set the floating point precision (in number of places) in numeric labels. */

void
c_plprec(PLINT setp, PLINT prec);

/* Set fill pattern, using one of the predefined patterns.*/

void
c_plpsty(PLINT patt);

/* Prints out "text" at world cooordinate (x,y). */

void
c_plptex(PLFLT x, PLFLT y, PLFLT dx, PLFLT dy, PLFLT just, const char *text);

/* Replays contents of plot buffer to current device/file. */

void
c_plreplot(void);

/* Set line color by red, green, blue from  0. to 1. */

void
c_plrgb(PLFLT r, PLFLT g, PLFLT b);

/* Set line color by 8 bit RGB values. */

void
c_plrgb1(PLINT r, PLINT g, PLINT b);

/* Set character height. */

void
c_plschr(PLFLT def, PLFLT scale);

/* Set color map 0 colors by 8 bit RGB values */

void
c_plscmap0(PLINT *r, PLINT *g, PLINT *b, PLINT ncol0);

/* Set number of colors in cmap 0 */

void
c_plscmap0n(PLINT ncol0);

/* Set color map 1 colors by 8 bit RGB values */

void
c_plscmap1(PLINT *r, PLINT *g, PLINT *b, PLINT ncol1);

/* Set color map 1 colors using a piece-wise linear relationship between */
/* intensity [0,1] (cmap 1 index) and position in HLS or RGB color space. */

void
c_plscmap1l(PLINT itype, PLINT npts, PLFLT *intensity,
	    PLFLT *coord1, PLFLT *coord2, PLFLT *coord3, PLINT *rev);

/* Set number of colors in cmap 1 */

void
c_plscmap1n(PLINT ncol1);

/* Set a given color from color map 0 by 8 bit RGB value */

void
c_plscol0(PLINT icol0, PLINT r, PLINT g, PLINT b);

/* Set the background color by 8 bit RGB value */

void
c_plscolbg(PLINT r, PLINT g, PLINT b);

/* Used to globally turn color output on/off */

void
c_plscolor(PLINT color);

/* Set the compression level */

void
c_plscompression(PLINT compression);

/* Set the device (keyword) name */

void
c_plsdev(const char *devname);

/* Set window into device space using margin, aspect ratio, and */
/* justification */

void
c_plsdidev(PLFLT mar, PLFLT aspect, PLFLT jx, PLFLT jy);

/* Set up transformation from metafile coordinates. */

void
c_plsdimap(PLINT dimxmin, PLINT dimxmax, PLINT dimymin, PLINT dimymax,
	   PLFLT dimxpmm, PLFLT dimypmm);

/* Set plot orientation, specifying rotation in units of pi/2. */

void
c_plsdiori(PLFLT rot);

/* Set window into plot space */

void
c_plsdiplt(PLFLT xmin, PLFLT ymin, PLFLT xmax, PLFLT ymax);

/* Set window into plot space incrementally (zoom) */

void
c_plsdiplz(PLFLT xmin, PLFLT ymin, PLFLT xmax, PLFLT ymax);

/* Set the escape character for text strings. */

void
c_plsesc(char esc);

/* Set family file parameters */

void
c_plsfam(PLINT fam, PLINT num, PLINT bmax);

/* Set the output file name. */

void
c_plsfnam(const char *fnam);

/* Shade region. */

void
c_plshade(PLFLT **a, PLINT nx, PLINT ny, PLINT (*defined) (PLFLT, PLFLT),
	  PLFLT left, PLFLT right, PLFLT bottom, PLFLT top,
	  PLFLT shade_min, PLFLT shade_max,
	  PLINT sh_cmap, PLFLT sh_color, PLINT sh_width,
	  PLINT min_color, PLINT min_width,
	  PLINT max_color, PLINT max_width,
	  void (*fill) (PLINT, PLFLT *, PLFLT *), PLINT rectangular,
	  void (*pltr) (PLFLT, PLFLT, PLFLT *, PLFLT *, PLPointer),
	  PLPointer pltr_data);

void
c_plshade1(PLFLT *a, PLINT nx, PLINT ny, PLINT (*defined) (PLFLT, PLFLT),
	 PLFLT left, PLFLT right, PLFLT bottom, PLFLT top,
	 PLFLT shade_min, PLFLT shade_max,
	 PLINT sh_cmap, PLFLT sh_color, PLINT sh_width,
	 PLINT min_color, PLINT min_width,
	 PLINT max_color, PLINT max_width,
	 void (*fill) (PLINT, PLFLT *, PLFLT *), PLINT rectangular,
	 void (*pltr) (PLFLT, PLFLT, PLFLT *, PLFLT *, PLPointer),
	 PLPointer pltr_data);

void
c_plshades( PLFLT **a, PLINT nx, PLINT ny, PLINT (*defined) (PLFLT, PLFLT),
	  PLFLT xmin, PLFLT xmax, PLFLT ymin, PLFLT ymax,
	  PLFLT *clevel, PLINT nlevel, PLINT fill_width,
	  PLINT cont_color, PLINT cont_width,
	  void (*fill) (PLINT, PLFLT *, PLFLT *), PLINT rectangular,
	  void (*pltr) (PLFLT, PLFLT, PLFLT *, PLFLT *, PLPointer),
	  PLPointer pltr_data);

void
plfshade(PLFLT (*f2eval) (PLINT, PLINT, PLPointer),
	 PLPointer f2eval_data,
	 PLFLT (*c2eval) (PLINT, PLINT, PLPointer),
	 PLPointer c2eval_data,
	 PLINT nx, PLINT ny,
	 PLFLT left, PLFLT right, PLFLT bottom, PLFLT top,
	 PLFLT shade_min, PLFLT shade_max,
	 PLINT sh_cmap, PLFLT sh_color, PLINT sh_width,
	 PLINT min_color, PLINT min_width,
	 PLINT max_color, PLINT max_width,
	 void (*fill) (PLINT, PLFLT *, PLFLT *), PLINT rectangular,
	 void (*pltr) (PLFLT, PLFLT, PLFLT *, PLFLT *, PLPointer),
	 PLPointer pltr_data);

/* Set up lengths of major tick marks. */

void
c_plsmaj(PLFLT def, PLFLT scale);

/* Set the memory area to be plotted (with the 'mem' driver) */

void
c_plsmem(PLINT maxx, PLINT maxy, void *plotmem);

/* Set up lengths of minor tick marks. */

void
c_plsmin(PLFLT def, PLFLT scale);

/* Set orientation.  Must be done before calling plinit. */

void
c_plsori(PLINT ori);

/* Set output device parameters.  Usually ignored by the driver. */

void
c_plspage(PLFLT xp, PLFLT yp, PLINT xleng, PLINT yleng,
	  PLINT xoff, PLINT yoff);

/* Set the pause (on end-of-page) status */

void
c_plspause(PLINT pause);

/* Set stream number.  */

void
c_plsstrm(PLINT strm);

/* Set the number of subwindows in x and y */

void
c_plssub(PLINT nx, PLINT ny);

/* Set symbol height. */

void
c_plssym(PLFLT def, PLFLT scale);

/* Initialize PLplot, passing in the windows/page settings. */

void
c_plstar(PLINT nx, PLINT ny);

/* Initialize PLplot, passing the device name and windows/page settings. */

void
c_plstart(const char *devname, PLINT nx, PLINT ny);

/* Add a point to a stripchart.  */

void
c_plstripa(PLINT id, PLINT pen, PLFLT x, PLFLT y);

/* Create 1d stripchart */

void
c_plstripc(PLINT *id, char *xspec, char *yspec,
	PLFLT xmin, PLFLT xmax, PLFLT xjump, PLFLT ymin, PLFLT ymax,
	PLFLT xlpos, PLFLT ylpos,
	PLINT y_ascl, PLINT acc,
	PLINT colbox, PLINT collab,
	PLINT colline[], PLINT styline[], char *legline[],
	char *labx, char *laby, char *labtop);

/* Deletes and releases memory used by a stripchart.  */

void
c_plstripd(PLINT id);

  /* plots a 2d image (or a matrix too large for plshade() ) */

void
plimage( PLFLT **data, PLINT nx, PLINT ny,
	 PLFLT xmin, PLFLT xmax, PLFLT ymin, PLFLT ymax, PLFLT zmin, PLFLT zmax,
	 PLFLT Dxmin, PLFLT Dxmax, PLFLT Dymin, PLFLT Dymax);

/* Set up a new line style */

void
c_plstyl(PLINT nms, PLINT *mark, PLINT *space);

/* Plots the 3d surface representation of the function z[x][y]. */

void
c_plsurf3d(PLFLT *x, PLFLT *y, PLFLT **z, PLINT nx, PLINT ny,
	   PLINT opt, PLFLT *clevel, PLINT nlevel);

/* Plots the 3d surface representation of the function z[x][y] with y
 * index limits. */

void
c_plsurf3dl(PLFLT *x, PLFLT *y, PLFLT **z, PLINT nx, PLINT ny,
	   PLINT opt, PLFLT *clevel, PLINT nlevel,
	   PLINT ixstart, PLINT ixn, PLINT *indexymin, PLINT*indexymax);

/* Sets the edges of the viewport to the specified absolute coordinates */

void
c_plsvpa(PLFLT xmin, PLFLT xmax, PLFLT ymin, PLFLT ymax);

/* Set x axis labeling parameters */

void
c_plsxax(PLINT digmax, PLINT digits);

/* Set inferior X window */

void
plsxwin(PLINT window_id);

/* Set y axis labeling parameters */

void
c_plsyax(PLINT digmax, PLINT digits);

/* Plots array y against x for n points using Hershey symbol "code" */

void
c_plsym(PLINT n, PLFLT *x, PLFLT *y, PLINT code);

/* Set z axis labeling parameters */

void
c_plszax(PLINT digmax, PLINT digits);

/* Switches to text screen. */

void
c_pltext(void);

/* Sets the edges of the viewport with the given aspect ratio, leaving */
/* room for labels. */

void
c_plvasp(PLFLT aspect);

/* Creates the largest viewport of the specified aspect ratio that fits */
/* within the specified normalized subpage coordinates. */

void
c_plvpas(PLFLT xmin, PLFLT xmax, PLFLT ymin, PLFLT ymax, PLFLT aspect);

/* Creates a viewport with the specified normalized subpage coordinates. */

void
c_plvpor(PLFLT xmin, PLFLT xmax, PLFLT ymin, PLFLT ymax);

/* Defines a "standard" viewport with seven character heights for */
/* the left margin and four character heights everywhere else. */

void
c_plvsta(void);

/* Set up a window for three-dimensional plotting. */

void
c_plw3d(PLFLT basex, PLFLT basey, PLFLT height, PLFLT xmin0,
	PLFLT xmax0, PLFLT ymin0, PLFLT ymax0, PLFLT zmin0,
	PLFLT zmax0, PLFLT alt, PLFLT az);

/* Set pen width. */

void
c_plwid(PLINT width);

/* Set up world coordinates of the viewport boundaries (2d plots). */

void
c_plwind(PLFLT xmin, PLFLT xmax, PLFLT ymin, PLFLT ymax);

/*  set xor mode; mode = 1-enter, 0-leave, status = 0 if not interactive device  */

void
c_plxormod(PLINT mode, PLINT *status);

/*--------------------------------------------------------------------------*\
 *		Functions for use from C or C++ only
\*--------------------------------------------------------------------------*/

/* Returns a list of file-oriented device names and their menu strings */

void
plgFileDevs(char ***p_menustr, char ***p_devname, int *p_ndev);

/* Returns a list of all device names and their menu strings */

void
plgDevs(char ***p_menustr, char ***p_devname, int *p_ndev);

/* Set the function pointer for the keyboard event handler */

void
plsKeyEH(void (*KeyEH) (PLGraphicsIn *, void *, int *), void *KeyEH_data);

/* Set the function pointer for the (mouse) button event handler */

void
plsButtonEH(void (*ButtonEH) (PLGraphicsIn *, void *, int *),
	    void *ButtonEH_data);

/* Sets an optional user bop handler */

void
plsbopH(void (*handler) (void *, int *), void *handler_data);

/* Sets an optional user eop handler */

void
plseopH(void (*handler) (void *, int *), void *handler_data);

/* Set the variables to be used for storing error info */

void
plsError(PLINT *errcode, char *errmsg);

/* Sets an optional user exit handler. */

void
plsexit(int (*handler) (char *));

/* Sets an optional user abort handler. */

void
plsabort(void (*handler) (char *));

	/* Transformation routines */

/* Identity transformation. */

void
pltr0(PLFLT x, PLFLT y, PLFLT *tx, PLFLT *ty, PLPointer pltr_data);

/* Does linear interpolation from singly dimensioned coord arrays. */

void
pltr1(PLFLT x, PLFLT y, PLFLT *tx, PLFLT *ty, PLPointer pltr_data);

/* Does linear interpolation from doubly dimensioned coord arrays */
/* (column dominant, as per normal C 2d arrays). */

void
pltr2(PLFLT x, PLFLT y, PLFLT *tx, PLFLT *ty, PLPointer pltr_data);

/* Just like pltr2() but uses pointer arithmetic to get coordinates from */
/* 2d grid tables.  */

void
pltr2p(PLFLT x, PLFLT y, PLFLT *tx, PLFLT *ty, PLPointer pltr_data);

/* Identity transformation for plots from Fortran. */

void
pltr0f(PLFLT x, PLFLT y, PLFLT *tx, PLFLT *ty, void *pltr_data);

/* Does linear interpolation from doubly dimensioned coord arrays */
/* (row dominant, i.e. Fortran ordering). */

void
pltr2f(PLFLT x, PLFLT y, PLFLT *tx, PLFLT *ty, void *pltr_data);

/* Example linear transformation function for contour plotter. */

void
xform(PLFLT x, PLFLT y, PLFLT * tx, PLFLT * ty);

	/* Function evaluators */

/* Does a lookup from a 2d function array.  Array is of type (PLFLT **), */
/* and is column dominant (normal C ordering). */

PLFLT
plf2eval2(PLINT ix, PLINT iy, PLPointer plf2eval_data);

/* Does a lookup from a 2d function array.  Array is of type (PLFLT *), */
/* and is column dominant (normal C ordering). */

PLFLT
plf2eval(PLINT ix, PLINT iy, PLPointer plf2eval_data);

/* Does a lookup from a 2d function array.  Array is of type (PLFLT *), */
/* and is row dominant (Fortran ordering). */

PLFLT
plf2evalr(PLINT ix, PLINT iy, PLPointer plf2eval_data);

	/* Command line parsing utilities */

/* Clear internal option table info structure. */

void
plClearOpts(void);

/* Reset internal option table info structure. */

void
plResetOpts(void);

/* Merge user option table into internal info structure. */

int
plMergeOpts(PLOptionTable *options, char *name, char **notes);

/* Set the strings used in usage and syntax messages. */

void
plSetUsage(char *program_string, char *usage_string);

/* Process input strings, treating them as an option and argument pair. */
/* The first is for the external API, the second the work routine declared
   here for backward compatibilty. */

int
c_plsetopt(char *opt, char *optarg);

int
plSetOpt(char *opt, char *optarg);

/* Process options list using current options info. */

int
plParseOpts(int *p_argc, char **argv, PLINT mode);

/* Print usage & syntax message. */

void
plOptUsage(void);

	/* Miscellaneous */

/* Set the output file pointer */

void
plgfile(FILE **p_file);

/* Get the output file pointer */

void
plsfile(FILE *file);

/* Get the escape character for text strings. */

void
plgesc(char *p_esc);

/* Front-end to driver escape function. */

void
pl_cmd(PLINT op, void *ptr);

/* Return full pathname for given file if executable */

int
plFindName(char *p);

/* Looks for the specified executable file according to usual search path. */

char *
plFindCommand(char *fn);

/* Gets search name for file by concatenating the dir, subdir, and file */
/* name, allocating memory as needed.  */

void
plGetName(char *dir, char *subdir, char *filename, char **filespec);

/* Prompts human to input an integer in response to given message. */

PLINT
plGetInt(char *s);

/* Prompts human to input a float in response to given message. */

PLFLT
plGetFlt(char *s);

	/* Nice way to allocate space for a vectored 2d grid */

/* Allocates a block of memory for use as a 2-d grid of PLFLT's.  */

void
plAlloc2dGrid(PLFLT ***f, PLINT nx, PLINT ny);

/* Frees a block of memory allocated with plAlloc2dGrid(). */

void
plFree2dGrid(PLFLT **f, PLINT nx, PLINT ny);

/* Find the maximum and minimum of a 2d matrix allocated with plAllc2dGrid(). */

void
plMinMax2dGrid(PLFLT **f, PLINT nx, PLINT ny, PLFLT *fmax, PLFLT *fmin);

/* Functions for converting between HLS and RGB color space */

void
plHLS_RGB(PLFLT h, PLFLT l, PLFLT s, PLFLT *p_r, PLFLT *p_g, PLFLT *p_b);

void
plRGB_HLS(PLFLT r, PLFLT g, PLFLT b, PLFLT *p_h, PLFLT *p_l, PLFLT *p_s);

/* Wait for graphics input event and translate to world coordinates */

int
plGetCursor(PLGraphicsIn *gin);

/* Translates relative device coordinates to world coordinates.  */

int
plTranslateCursor(PLGraphicsIn *gin);

#ifdef __cplusplus
}
#endif

#endif	/* __PLPLOT_H__ */