/* GNUPLOT - context.trm */

/*[

* Copyright (c) 2006-2011, Mojca Miklavec

* All rights reserved.

*

* Redistribution and use in source and binary forms, with or without

* modification, are permitted provided that the following conditions are met:

*

* - Redistributions of source code must retain the above copyright notice,

* this list of conditions and the following disclaimer.

* - Redistributions in binary form must reproduce the above copyright notice,

* this list of conditions and the following disclaimer in the documentation

* and/or other materials provided with the distribution.

*

* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

* POSSIBILITY OF SUCH DAMAGE.

]*/

/*

* AUTHORS:

* Mojca Miklavec

* <mojca.miklavec.lists at gmail.com>

* - author of this file

* - improvements to m-gnuplot.tex

* - mp-gnuplot.mp - metapost macros to support gnuplot-specifics

* inside ConTeXt

*

* Hans Hagen (author of ConTeXt)

* <pragma at wxs.nl>

* - a lot of functionality added to ConTeXt to enable better support

* of Gnuplot module, many bugs fixed

* - author of the module m-gnuplot.tex to support inclusion of Gnuplot

* graphics into ConTeXt

* - constant support on the most tricky issues

* Taco Hoekwater (developer of MetaPost, pdfTeX & LuaTeX)

* <taco at elvenkind.com>

* - some code of this file, many tricks, lots of bug fixes,

* suggestions and testing

* - Hans's right hand in ConTeXt development:

* constant support on even more tricky issues

*

* For questions, suggestions, comments, improvements please contact:

* - Mojca Miklavec <mojca.miklavec.lists at gmail.com> or

* - <gnuplot-context at googlegroups.com>

* - http://wiki.contextgarden.net/Gnuplot

*

* With special thanks to:

* - Peter Münster (ctx) for the initiative

* - Renaud Aubin (ctx) for maintaining the first source code repository

* - Aditya Mahajan (ctx) for some tricky parts in m-gnuplot.tex

* - Timothée Lecomte & Ethan A Merritt (gnuplot) for many suggestion about improving this terminal

* - Bastian Märkisch (gnuplot) for code improvements

*

*/

/*

* GNUPLOT -- context.trm

*

* This driver creates a ConTeXt document with embded metapost (metafun)

* commands and is consequently used for creation of PDF documents.

*

* It is in a way similar to pslatex, but specialized for ConTeXt,

* where it can also be used in the following way:

*

* \usemodule[gnuplot]

*

* \starttext

* \title{Drawing nice graphs with \sc gnuplot}

* \startGNUPLOTscript{sin}

* plot sin(x) t '$\sin(x)$'

* \stopGNUPLOTscript

* \useGNUPLOTgraphic[sin]

* \stoptext

*

* For more information see http://wiki.contextgarden.net/Gnuplot

*

* Mostly based on:

* - default settings copied from LaTeX terminal (because I liked it)

* - path construction & drawing routines from MetaPost terminal

* - advanced functionality with reference to PostScript terminal

*

* Future plans:

* - most important

* - different syntax for font switching

* - improve support for (transparent) binary images

* - add missing functionality:

* - improved support for palettes

* - smooth shading in color bars

* - gouraud shading (if it will be implemented in gnuplot)

* - other color spaces

* - derive a better metapost terminal out of this one (to replace the old one)

*/

#include "driver.h"

#include "pm3d.h"

#ifdef TERM_REGISTER

register_term(context)

#endif

#ifdef TERM_PROTO

TERM_PUBLIC void CONTEXT_options(void);

TERM_PUBLIC void CONTEXT_init(void);

TERM_PUBLIC void CONTEXT_reset(void);

TERM_PUBLIC void CONTEXT_text(void);

TERM_PUBLIC void CONTEXT_graphics(void);

TERM_PUBLIC void CONTEXT_move(unsigned int x, unsigned int y);

TERM_PUBLIC void CONTEXT_vector(unsigned int x, unsigned int y);

TERM_PUBLIC void CONTEXT_linetype(int lt);

TERM_PUBLIC void CONTEXT_put_text(unsigned int x, unsigned int y, const char *str);

TERM_PUBLIC int CONTEXT_text_angle(float ang);

TERM_PUBLIC int CONTEXT_justify_text(enum JUSTIFY mode);

TERM_PUBLIC void CONTEXT_point(unsigned int x, unsigned int y, int number);

TERM_PUBLIC void CONTEXT_arrow(unsigned int sx, unsigned int sy, unsigned int ex, unsigned int ey, int head);

TERM_PUBLIC int CONTEXT_set_font(const char *font); /* "font,size" */

TERM_PUBLIC void CONTEXT_pointsize(double pointsize);

TERM_PUBLIC void CONTEXT_fillbox(int style, unsigned int x1, unsigned int y1, unsigned int width, unsigned int height); /* clear part of multiplot */

TERM_PUBLIC void CONTEXT_fill(int style);

TERM_PUBLIC void CONTEXT_linewidth(double linewidth);

TERM_PUBLIC int CONTEXT_make_palette(t_sm_palette *palette);

/* TERM_PUBLIC void CONTEXT_previous_palette(void); do we need it? */

TERM_PUBLIC void CONTEXT_set_color(t_colorspec *colorspec);

TERM_PUBLIC void CONTEXT_filled_polygon(int points, gpiPoint *corners);

TERM_PUBLIC void CONTEXT_image(unsigned, unsigned, coordval *, gpiPoint *, t_imagecolor);

/* Metapost < 1.750 can only deal with numbers between 2^{-16} and 2^12=4069 */

/* scale is 1cm = 1000 units */

#define CONTEXT_DPCM 1000

#define CONTEXT_DPI (2.54 * CONTEXT_DPCM)

/* default plot size will be 5in x 3in */

#define CONTEXT_XSIZE_VALUE 5

#define CONTEXT_YSIZE_VALUE 3

#define CONTEXT_SIZE_UNIT INCHES

#define CONTEXT_XMAX (CONTEXT_XSIZE_VALUE * CONTEXT_DPI)

#define CONTEXT_YMAX (CONTEXT_YSIZE_VALUE * CONTEXT_DPI)

/* default fontsize: 12pt */

#define CONTEXT_FONTSIZE 12.0

/* default height of char: 12pt by default */

#define CONTEXT_VCHAR (CONTEXT_DPI * CONTEXT_FONTSIZE / 72.27)

/* in ConTeXt 12pt LM font is the default;

* at that size digits are 5.8749847pt wide

* in LaTeX, which assumes 11pt, the ratio is 5.3/11, which is similar */

#define CONTEXT_LM_H_TO_V_RATIO 0.4895

#define CONTEXT_HCHAR (CONTEXT_LM_H_TO_V_RATIO * CONTEXT_VCHAR)

/* default tic size: 3.5bp (chosen to suit the size of plot approximately)

* - in LaTeX it is 5bp

* - in TikZ it is 0.18cm (approximately 5.1bp)

* - in PostScript it is 3.15pt

* - MetaPost uses 5pt or 5bp

*/

#define CONTEXT_HTIC (3.5 * CONTEXT_DPI / 72)

#define CONTEXT_VTIC CONTEXT_HTIC

#endif /* TERM_PROTO */

#ifndef TERM_PROTO_ONLY

#ifdef TERM_BODY

/*

* started counting when the code was included into CVS

*

* major number should change only in case of a complete rewrite or major incompatibility

* minor number should change for every new functionality

* patch number & date should change in every commit

*/

static const char CONTEXT_term_version[] = "1.0";

static const char CONTEXT_term_patch[] = "0";

static const char CONTEXT_term_date[] = "2011-11-05";

static void CONTEXT_params_reset(void);

static void CONTEXT_adjust_dimensions(void);

static void CONTEXT_fontstring_parse(char *from_string, char *to_string, int to_size, double *fontsize);

static void CONTEXT_startpath(void);

static void CONTEXT_endpath(void);

static void CONTEXT_write_palette(t_sm_palette *palette);

static void CONTEXT_write_palette_gradient(gradient_struct *gradient, int cnt);

/* Each number is divided by 100 (1/100th of a point is drawn) */

static int CONTEXT_posx;

static int CONTEXT_posy;

/* remembers where we started the path:

* if we finish it in the same point, the path is closed with --cycle

*

* After I implemented this, the functionality has been added to gnuplot core

* and PostScript terminal uses it, but to be on the safe side,

* I prefer not to add last-minute patches which could potentially break something.

* (the code written here proved to be rather safe & working so far)

* In the next version the core functionality should be integrated & tested.

*/

static int CONTEXT_path_start_x;

static int CONTEXT_path_start_y;

/* fontname, fontsize */

static char CONTEXT_font[MAX_ID_LEN+1] = "";

static double CONTEXT_fontsize = CONTEXT_FONTSIZE;

/* fontname,fontsize to be put next to font labels if needed */

static char CONTEXT_font_explicit[2*MAX_ID_LEN+1] = "";

/* this is only set to >0 if asked for explicitly (for example with set_font(",15")) */

static double CONTEXT_fontsize_explicit = 0.0;

/* the last pointsize used (it will only be changed if it becomes different) */

static double CONTEXT_old_pointsize = 1.0;

/* the last linewidth used (it will only be changed if it becomes different) */

static double CONTEXT_old_linewidth = 1.0;

/* the last linetype used (it will only be changed if it becomes different) */

static int CONTEXT_old_linetype = -3;

/* was the color changed explicitly? */

static TBOOLEAN CONTEXT_color_changed = FALSE;

/* the number of path nodes before a newline (doesn't really matter,

* could be set to 1000; check if any editors have problems with that) */

#define CONTEXT_LINEMAX 4

/* if we're inside a path (unfinished line) then path_count > 0

* (PDF has PDF_pathIsOpen) */

static unsigned int CONTEXT_path_count = 0;

/* this true/false switch is used to help distinguish dots from paths */

static unsigned int CONTEXT_path_is_dot = 0;

/* angle of text rotation */

static int CONTEXT_ang = 0;

/* left/middle/right text justification */

static enum JUSTIFY CONTEXT_justify = LEFT;

#ifdef OS2 /* same constants are defined in os2emx.h */

enum LINEJOIN { LINEJOIN_MITER=LINEJOIN_MITRE, _LINEJOIN_ROUND=LINEJOIN_ROUND, _LINEJOIN_BEVEL=LINEJOIN_BEVEL };

#else

enum LINEJOIN { LINEJOIN_MITER, LINEJOIN_ROUND, LINEJOIN_BEVEL };

#endif

enum LINECAP { LINECAP_BUTT, LINECAP_ROUND, LINECAP_SQUARE };

/* whether points are drawn with metapost or typeset with TeX (easy configurable) */

enum CONTEXT_POINTS { CONTEXT_POINTS_WITH_METAPOST, CONTEXT_POINTS_WITH_TEX };

/* whether images are inline or written out as PNGs and included (in MKII only external work) */

enum CONTEXT_IMAGES { CONTEXT_IMAGES_INLINE, CONTEXT_IMAGES_EXTERNAL };

/* counts the number of graphics */

static int CONTEXT_counter = 0;

/* counts the number of external PNG images */

static int CONTEXT_image_counter = 0;

/* length of basename for storing image name (including path, excluding extension) */

static int CONTEXT_image_filename_length = 0;

/* if name is a path, remember at which index basename starts */

static int CONTEXT_image_filename_start = 0;

static char *CONTEXT_image_filename = NULL;

/* whether images will be external or not */

enum CONTEXT_IMAGES CONTEXT_images = CONTEXT_IMAGES_INLINE;

/* Palette has to be stored for the usage in later plots */

static t_sm_palette *CONTEXT_old_palette;

/*********************/

/* global parameters */

/*********************/

typedef struct CONTEXT_params_t {

double xsize; /* 5in */

double ysize; /* 3in */

size_units unit; /* INCHES */

TBOOLEAN standalone; /* false */

TBOOLEAN timestamp; /* true */

char *header; /* "" */

TBOOLEAN color; /* true */

TBOOLEAN dashed; /* true */

enum LINEJOIN linejoin; /* MITER */

enum LINECAP linecap; /* BUTT */

double scale_dashlength; /* 1.0 */

double scale_linewidth; /* 1.0 */

double scale_text; /* 1.0 */

enum CONTEXT_POINTS points; /* CONTEXT_POINTS_WITH_METAPOST */

enum CONTEXT_IMAGES images; /* CONTEXT_IMAGES_INLINE */

char font[MAX_ID_LEN+1]; /* "" */

double fontsize; /* 12pt */

} CONTEXT_params_t;

#define CONTEXT_PARAMS_DEFAULT { \

CONTEXT_XSIZE_VALUE,\

CONTEXT_YSIZE_VALUE,\

INCHES,\

FALSE,\

TRUE,\

NULL,\

TRUE,\

TRUE,\

LINEJOIN_MITER,\

LINECAP_BUTT,\

1.0,\

1.0,\

1.0,\

CONTEXT_POINTS_WITH_METAPOST,\

CONTEXT_IMAGES_INLINE,\

"",\

CONTEXT_FONTSIZE\

}

static CONTEXT_params_t CONTEXT_params = CONTEXT_PARAMS_DEFAULT;

enum CONTEXT_id {

CONTEXT_OPT_DEFAULT,

CONTEXT_OPT_SIZE,

CONTEXT_OPT_SIZE_DEFAULT,

CONTEXT_OPT_INPUT, CONTEXT_OPT_STANDALONE,

CONTEXT_OPT_TIMESTAMP, CONTEXT_OPT_NOTIMESTAMP,

CONTEXT_OPT_HEADER, CONTEXT_OPT_NOHEADER,

CONTEXT_OPT_COLOR, CONTEXT_OPT_MONOCHROME,

CONTEXT_OPT_DASHED, CONTEXT_OPT_SOLID,

CONTEXT_OPT_LINEJOIN_MITERED, CONTEXT_OPT_LINEJOIN_ROUNDED, CONTEXT_OPT_LINEJOIN_BEVELED,

CONTEXT_OPT_LINECAP_BUTT, CONTEXT_OPT_LINECAP_ROUNDED, CONTEXT_OPT_LINECAP_SQUARED,

CONTEXT_OPT_SCALE_DASHLENGTH, CONTEXT_OPT_SCALE_LINEWIDTH, CONTEXT_OPT_SCALE_TEXT,

CONTEXT_OPT_POINTS_WITH_METAPOST, CONTEXT_OPT_POINTS_WITH_TEX,

CONTEXT_OPT_IMAGES_INLINE, CONTEXT_OPT_IMAGES_EXTERNAL,

CONTEXT_OPT_DEFAULTFONT,

CONTEXT_OPT_FONT,

CONTEXT_OPT_OTHER

};

static struct gen_table CONTEXT_opts[] = {

{ "d$efault", CONTEXT_OPT_DEFAULT },

{ "size", CONTEXT_OPT_SIZE },

{ "defaultsize", CONTEXT_OPT_SIZE_DEFAULT },

{ "inp$ut", CONTEXT_OPT_INPUT },

{ "stand$alone", CONTEXT_OPT_STANDALONE },

{ "time$stamp", CONTEXT_OPT_TIMESTAMP },

{ "notime$stamp", CONTEXT_OPT_NOTIMESTAMP },

{ "header", CONTEXT_OPT_HEADER },

{ "noheader", CONTEXT_OPT_NOHEADER },

{ "col$or", CONTEXT_OPT_COLOR },

{ "col$our", CONTEXT_OPT_COLOR },

{ "mono$chrome", CONTEXT_OPT_MONOCHROME },

{ "da$shed", CONTEXT_OPT_DASHED },

{ "so$lid", CONTEXT_OPT_SOLID },

{ "miter$ed", CONTEXT_OPT_LINEJOIN_MITERED },

{ "rounded", CONTEXT_OPT_LINEJOIN_ROUNDED },

{ "bevel$ed", CONTEXT_OPT_LINEJOIN_BEVELED },

{ "butt", CONTEXT_OPT_LINECAP_BUTT },

{ "round", CONTEXT_OPT_LINECAP_ROUNDED },

{ "square$d", CONTEXT_OPT_LINECAP_SQUARED },

{ "dashl$ength", CONTEXT_OPT_SCALE_DASHLENGTH },

{ "dl", CONTEXT_OPT_SCALE_DASHLENGTH },

{ "linew$idth", CONTEXT_OPT_SCALE_LINEWIDTH },

{ "lw", CONTEXT_OPT_SCALE_LINEWIDTH },

{ "fontscale", CONTEXT_OPT_SCALE_TEXT },

{ "textscale", CONTEXT_OPT_SCALE_TEXT }, /* backward compatibility */

{ "mp$points", CONTEXT_OPT_POINTS_WITH_METAPOST},

{ "tex$points", CONTEXT_OPT_POINTS_WITH_TEX},

{ "pointswithmp", CONTEXT_OPT_POINTS_WITH_METAPOST}, /* (removable) backward compatibility */

{ "pointswithmetapost", CONTEXT_OPT_POINTS_WITH_METAPOST}, /* (removable) backward compatibility */

{ "pointswithtex", CONTEXT_OPT_POINTS_WITH_TEX}, /* (removable) backward compatibility */

{ "inline$images", CONTEXT_OPT_IMAGES_INLINE},

{ "external$images", CONTEXT_OPT_IMAGES_EXTERNAL},

{ "font", CONTEXT_OPT_FONT },

{ "defaultfont", CONTEXT_OPT_DEFAULTFONT },

{ NULL, CONTEXT_OPT_OTHER }

};

/* **********************

* CONTEXT_params_reset *

* **********************

*

* Resets all parameters of the terminal to their default value.

*/

static void

CONTEXT_params_reset()

{

static const CONTEXT_params_t CONTEXT_params_default = CONTEXT_PARAMS_DEFAULT;

/* free the memory with header first */

if (CONTEXT_params.header) {

free(CONTEXT_params.header);

CONTEXT_params.header = NULL;

}

memcpy(&CONTEXT_params, &CONTEXT_params_default, sizeof(CONTEXT_params_t));

}

/* *****************

* CONTEXT_options *

* *****************

*

* Parses "set term context [options]".

*/

TERM_PUBLIC void

CONTEXT_options()

{

char *tmp_string;

char tmp_term_options[MAX_LINE_LEN+1] = "";

while (!END_OF_COMMAND) {

switch (lookup_table(&CONTEXT_opts[0], c_token)) {

case CONTEXT_OPT_DEFAULT:

c_token++;

/* there should be a better way to do it, but I don't know how */

CONTEXT_params_reset();

break;

case CONTEXT_OPT_SIZE: {

float xmax_t, ymax_t;

size_units unit;

c_token++;

/* size <xsize> {cm|in}, <ysize> {cm|in} */

unit = parse_term_size(&xmax_t, &ymax_t, CM);

CONTEXT_params.xsize = (double)xmax_t / gp_resolution;

CONTEXT_params.ysize = (double)ymax_t / gp_resolution;

CONTEXT_params.unit = unit;

if (unit == CM) {

CONTEXT_params.xsize *= 2.54;

CONTEXT_params.ysize *= 2.54;

}

break;

}

case CONTEXT_OPT_SIZE_DEFAULT:

c_token++;

CONTEXT_params.xsize = CONTEXT_XSIZE_VALUE;

CONTEXT_params.ysize = CONTEXT_YSIZE_VALUE;

CONTEXT_params.unit = CONTEXT_SIZE_UNIT;

break;

case CONTEXT_OPT_INPUT:

c_token++;

CONTEXT_params.standalone = FALSE;

break;

case CONTEXT_OPT_STANDALONE:

c_token++;

CONTEXT_params.standalone = TRUE;

break;

case CONTEXT_OPT_TIMESTAMP:

c_token++;

CONTEXT_params.timestamp = TRUE;

break;

case CONTEXT_OPT_NOTIMESTAMP:

c_token++;

CONTEXT_params.timestamp = FALSE;

break;

case CONTEXT_OPT_HEADER:

c_token++;

/* parse the string */

tmp_string = try_to_get_string();

if (!tmp_string) {

int_error(c_token,"String containing header information expected");

/* only touch the options if the string is OK */

} else {

/* remove the old header if any */

if (CONTEXT_params.header) {

free(CONTEXT_params.header);

CONTEXT_params.header = NULL;

}

/* and set the new one if nonempty;

* empty header will be treated as 'noheader' */

if (strlen(tmp_string) > 0) {

CONTEXT_params.header = tmp_string;

} else {

free(tmp_string);

}

}

break;

case CONTEXT_OPT_NOHEADER:

c_token++;

/* delete the header if it exists */

if (CONTEXT_params.header) {

free(CONTEXT_params.header);

CONTEXT_params.header = NULL;

}

break;

case CONTEXT_OPT_COLOR:

c_token++;

CONTEXT_params.color = TRUE;

/* just mimic other terminals; no idea what it does;

at the moment monochrome is not fully implemented either */

term->flags &= ~TERM_MONOCHROME;

break;

case CONTEXT_OPT_MONOCHROME:

c_token++;

CONTEXT_params.color = FALSE;

term->flags |= TERM_MONOCHROME;

break;

case CONTEXT_OPT_DASHED:

c_token++;

CONTEXT_params.dashed = TRUE;

break;

case CONTEXT_OPT_SOLID:

c_token++;

CONTEXT_params.dashed = FALSE;

break;

case CONTEXT_OPT_LINEJOIN_MITERED:

c_token++;

CONTEXT_params.linejoin = LINEJOIN_MITER;

break;

case CONTEXT_OPT_LINEJOIN_ROUNDED:

c_token++;

CONTEXT_params.linejoin = LINEJOIN_ROUND;

break;

case CONTEXT_OPT_LINEJOIN_BEVELED:

c_token++;

CONTEXT_params.linejoin = LINEJOIN_BEVEL;

break;

case CONTEXT_OPT_LINECAP_BUTT:

c_token++;

CONTEXT_params.linecap = LINECAP_BUTT;

break;

case CONTEXT_OPT_LINECAP_ROUNDED:

c_token++;

CONTEXT_params.linecap = LINECAP_ROUND;

break;

case CONTEXT_OPT_LINECAP_SQUARED:

c_token++;

CONTEXT_params.linecap = LINECAP_SQUARE;

break;

case CONTEXT_OPT_SCALE_DASHLENGTH:

c_token++;

CONTEXT_params.scale_dashlength = real_expression();

break;

case CONTEXT_OPT_SCALE_LINEWIDTH:

c_token++;

CONTEXT_params.scale_linewidth = real_expression();

break;

case CONTEXT_OPT_SCALE_TEXT:

c_token++;

CONTEXT_params.scale_text = real_expression();

break;

case CONTEXT_OPT_DEFAULTFONT:

c_token++;

/* CONTEXT_params.font should be an empty string */

CONTEXT_params.font[0] = 0;

/* default fontsize is 12pt */

CONTEXT_params.fontsize = CONTEXT_FONTSIZE;

break;

case CONTEXT_OPT_POINTS_WITH_METAPOST:

c_token++;

CONTEXT_params.points = CONTEXT_POINTS_WITH_METAPOST;

break;

case CONTEXT_OPT_POINTS_WITH_TEX:

c_token++;

CONTEXT_params.points = CONTEXT_POINTS_WITH_TEX;

break;

case CONTEXT_OPT_IMAGES_INLINE:

c_token++;

CONTEXT_params.images = CONTEXT_IMAGES_INLINE;

break;

case CONTEXT_OPT_IMAGES_EXTERNAL:

#ifdef WRITE_PNG_IMAGE

c_token++;

CONTEXT_params.images = CONTEXT_IMAGES_EXTERNAL;

#else

int_warn(c_token, "Gnuplot was built without support for PNG images. You cannot use this option unless you rebuild gnuplot.");

#endif

break;

/*

* The preferred way to set the font is to set it in a document itself,

* labels in gnuplot in graphs will then inherit that font.

*

* However, it is important to tell gnuplot which size is going to be used,

* so that it can estimate size of text labels.

*

* Whenever you specify

* set term context font "fontname,14"

*

* there are two possibilities:

* - if STANDALONE mode is on, then the whole string will be used as

* \setupbodyfont[fontname,14pt]

* somewhere on top of the document (you still have to make sure that you

* included the proper typescript, so that "fontname" will be recognised

* - in the other case (INPUT mode) only the font size will be used

* internally to estimate sizes of labels, but the font name

* won't be written anywhere

*/

case CONTEXT_OPT_FONT: {

double tmp_fontsize;

char tmp_font[MAX_ID_LEN+1] = "";

c_token++;

if ((tmp_string = try_to_get_string()) && (tmp_string != NULL)) {

CONTEXT_fontstring_parse(tmp_string, tmp_font, MAX_ID_LEN+1, &tmp_fontsize);

/* copies font name to parameters */

safe_strncpy(CONTEXT_params.font, tmp_font, sizeof(CONTEXT_params.font));

tmp_font[MAX_ID_LEN] = NUL;

free(tmp_string);

/* save font size:

*

* - if size > 0, copy

* - if size < 0, fix the size to default value (12pt)

* - if size = 0, ignore

*/

if (tmp_fontsize > 0)

CONTEXT_params.fontsize = tmp_fontsize;

else if (tmp_fontsize < 0)

CONTEXT_params.fontsize = CONTEXT_FONTSIZE;

}

break;

}

case CONTEXT_OPT_OTHER:

default:

/* error */

int_error(c_token, "extraneous argument in set terminal %s",term->name);

break;

}

}

/* current font size in pt (to be used in CONTEXT_adjust_dimensions) */

CONTEXT_fontsize = CONTEXT_params.fontsize;

/* sets term->xmax, ymax, vchar, hchar */

CONTEXT_adjust_dimensions();

snprintf(term_options, sizeof(term_options),

"size %g%s,%g%s %s %s %s",

CONTEXT_params.xsize,

(CONTEXT_params.unit == INCHES) ? "in" : "cm",

CONTEXT_params.ysize,

(CONTEXT_params.unit == INCHES) ? "in" : "cm",

CONTEXT_params.standalone ? "standalone" : "input",

CONTEXT_params.timestamp ? "timestamp" : "notimestamp",

CONTEXT_params.header == NULL ? "noheader \\\n " : "\\\n header ");

if (CONTEXT_params.header != NULL) {

strncat(term_options,"\"", sizeof(term_options)-strlen(term_options)-1);

strncat(term_options,CONTEXT_params.header, sizeof(term_options)-strlen(term_options)-1);

strncat(term_options,"\" \\\n ", sizeof(term_options)-strlen(term_options)-1);

}

strncat(term_options,

CONTEXT_params.color ? "color " : "monochrome ",

sizeof(term_options)-strlen(term_options)-1);

switch (CONTEXT_params.linejoin) {

case LINEJOIN_MITER:

strncat(term_options, "mitered ",

sizeof(term_options)-strlen(term_options)-1);

break;

case LINEJOIN_ROUND:

strncat(term_options, "rounded ",

sizeof(term_options)-strlen(term_options)-1);

break;

case LINEJOIN_BEVEL:

strncat(term_options, "beveled ",

sizeof(term_options)-strlen(term_options)-1);

break;

}

switch (CONTEXT_params.linecap) {

case LINECAP_BUTT :

strncat(term_options, "butt",

sizeof(term_options)-strlen(term_options)-1);

break;

case LINECAP_ROUND :

strncat(term_options, "round",

sizeof(term_options)-strlen(term_options)-1);

break;

case LINECAP_SQUARE:

strncat(term_options, "squared",

sizeof(term_options)-strlen(term_options)-1);

break;

}

snprintf(tmp_term_options, sizeof(tmp_term_options),

" %s dashlength %g linewidth %g fontscale %g \\\n ",

CONTEXT_params.dashed ? "dashed" : "solid",

CONTEXT_params.scale_dashlength,

CONTEXT_params.scale_linewidth,

CONTEXT_params.scale_text

);

strncat(term_options, tmp_term_options, sizeof(term_options)-strlen(term_options)-1);

switch (CONTEXT_params.points) {

case CONTEXT_POINTS_WITH_TEX :

strncat(term_options, "texpoints ",

sizeof(term_options)-strlen(term_options)-1);

break;

case CONTEXT_POINTS_WITH_METAPOST :

strncat(term_options, "mppoints ",

sizeof(term_options)-strlen(term_options)-1);

break;

}

#ifdef WRITE_PNG_IMAGE

switch (CONTEXT_params.images) {

case CONTEXT_IMAGES_INLINE :

strncat(term_options, "inlineimages ",

sizeof(term_options)-strlen(term_options)-1);

break;

case CONTEXT_IMAGES_EXTERNAL :

strncat(term_options, "externalimages ",

sizeof(term_options)-strlen(term_options)-1);

break;

}

#endif

snprintf(tmp_term_options, sizeof(tmp_term_options), "font \"%s,%g\"",

CONTEXT_params.font, CONTEXT_params.fontsize);

strncat(term_options, tmp_term_options, sizeof(term_options) - strlen(term_options)-1);

}

/* **************

* CONTEXT_init *

* **************

*

* Starts a new file.

*

* XXX: "set term context" multiple times will only include those graphics

* that were create before issuing a new "set term context options"

* this should be fixed in the core by reopening the file

* (removing previously written content).

* - PDF & binary terminals start a new file

* - PS & TeX-based terminals continue

*/

TERM_PUBLIC void

CONTEXT_init()

{

time_t now;

char timebuffer[100];

#ifdef WRITE_PNG_IMAGE

int i;

#endif

time(&now);

CONTEXT_posx = CONTEXT_posy = 0;

CONTEXT_path_count = 0;

CONTEXT_path_is_dot = 0;

CONTEXT_counter = 0;

/* setup bitmap images */

CONTEXT_image_counter = 0;

/* the default is to use inline images */

CONTEXT_images = CONTEXT_IMAGES_INLINE;

/* only if external images are both requested and supported, we switch to them (double paranoia) */

/* delete the stored filename first */

if (CONTEXT_image_filename) {

free(CONTEXT_image_filename);

CONTEXT_image_filename = NULL;

CONTEXT_image_filename_length = 0;

CONTEXT_image_filename_start = 0;

};

#ifdef WRITE_PNG_IMAGE

if (CONTEXT_params.images == CONTEXT_IMAGES_EXTERNAL) {

CONTEXT_images = CONTEXT_IMAGES_EXTERNAL;

/* but only if 'set output' was set because we use that string as base for image names */

if (outstr) {

CONTEXT_image_filename_length = strlen(outstr);

CONTEXT_image_filename_start = strlen(outstr) - strlen(gp_basename(outstr));

/* we will cut off the last .tex ending if present */

/* find the last dot if present */

for (i = CONTEXT_image_filename_length - 1; i >= 0 && outstr[i] != '.'; i--);

if (outstr[i] == '.')

CONTEXT_image_filename_length = i;

/* it would also be very nice to do some sanity checks on filenames */

/* <name>.xx.png; must be at least 7 characters long */

CONTEXT_image_filename = (char *)gp_alloc(CONTEXT_image_filename_length + 10, "ConTeXt image filename");

strncpy(CONTEXT_image_filename, outstr, CONTEXT_image_filename_length);

CONTEXT_image_filename[CONTEXT_image_filename_length] = 0;

} else {

CONTEXT_image_filename_length = strlen("gp_image");

CONTEXT_image_filename_start = 0;

/* <name>.xx.png; must be at least 7 characters long */

CONTEXT_image_filename = (char *)gp_alloc(CONTEXT_image_filename_length + 10, "ConTeXt image filename");

strncpy(CONTEXT_image_filename, "gp_image", CONTEXT_image_filename_length);

CONTEXT_image_filename[CONTEXT_image_filename_length] = 0;

}

}

#endif

fprintf(gpoutfile, "%% Written by ConTeXt terminal for GNUPLOT");

if (CONTEXT_params.timestamp) {

if (strftime(timebuffer, 100, "%Y-%m-%d %H:%M %Z", localtime(&now)) != 0)

fprintf(gpoutfile, " on: %s", timebuffer);

}

fprintf(gpoutfile, "\n");

fprintf(gpoutfile, "%% GNUPLOT version: %s.%s, terminal version: %s.%s (%s)\n",

gnuplot_version, gnuplot_patchlevel, CONTEXT_term_version, CONTEXT_term_patch, CONTEXT_term_date);

fprintf(gpoutfile, "%% See also http://wiki.contextgarden.net/Gnuplot\n%%\n");

/* place the header first if this is a standalone graphic */

if (CONTEXT_params.standalone) {

/* If encoding is explicitly set to UTF-8 by gnuplot, use that setting.

* \enableregime only makes a difference for pdfTeX; in LuaTeX and XeTeX UTF-8 is already default,

* so this line will be ignored.

*

* There is no extra support for other encodings on purpose:

* - ConTeXt doesn't support all encodings supported by Gnuplot.

* - In LuaTeX and XeTeX one should not use any other encoding anyway.

* - pdfTeX users are free to use "header '\enableregime[...]'" */

switch (encoding) {

case S_ENC_UTF8:

fputs("\\enableregime\n [utf-8]\n", gpoutfile);

break;

default:

/* do nothing */

break;

}

/* load the gnuplot module */

fputs("\\usemodule\n [gnuplot]\n", gpoutfile);

/* enable or disable color (the only place where "color" is indeed used so far) */

fprintf(gpoutfile, "\\setupcolors\n [state=%s]\n", CONTEXT_params.color ? "start" : "stop");

/* additional user-provided header information (if available) */

if (CONTEXT_params.header)

fprintf(gpoutfile, "%s\n", CONTEXT_params.header);

/* for some reason setting \bodyfontenvironment is needed,

* otherwise \switchtobodyfont[name] doesn't work OK */

if (!(CONTEXT_params.fontsize == CONTEXT_FONTSIZE))

fprintf(gpoutfile, "\\definebodyfontenvironment\n [%gpt]\n",

CONTEXT_params.fontsize);

/* set the proper font: \setupbodyfont[{fontname,}fontsize sizeunit] */

fprintf(gpoutfile, "\\setupbodyfont\n [%s%s%gpt]\n",

CONTEXT_params.font,

/* write a comma only if the last string was non-empty */

((strlen(CONTEXT_params.font)>0) ? "," : ""),

CONTEXT_params.fontsize);

/*---------*

* options *

*---------*/

fprintf(gpoutfile, "\\setupGNUPLOTterminal\n [context]\n [");

/* color (gp_use_color): yes/no (true/false)

* default: yes

* - doesn't do anything useful yet;

* and besides that, it's already set in \setupcolors[state=start] */

/* fprintf(gpoutfile, " color=%s, %% *yes* | no\n", CONTEXT_params.color ? "yes" : "no"); */

/* linejoin: mitered/rounded/beveled

* default: mitered */

fprintf(gpoutfile, "linejoin=");

switch (CONTEXT_params.linejoin) {

case LINEJOIN_MITER: fprintf(gpoutfile, "mitered"); break;

case LINEJOIN_ROUND: fprintf(gpoutfile, "rounded"); break;

case LINEJOIN_BEVEL: fprintf(gpoutfile, "beveled"); break;

}

fprintf(gpoutfile, ", %% *mitered* | rounded | beveled\n");

/* linecap: butt/rounded/squared

* default: butt */

fprintf(gpoutfile, " linecap=");

switch (CONTEXT_params.linecap) {

case LINECAP_BUTT : fprintf(gpoutfile, "butt"); break;

case LINECAP_ROUND : fprintf(gpoutfile, "rounded"); break;

case LINECAP_SQUARE: fprintf(gpoutfile, "squared"); break;

}

fprintf(gpoutfile, ", %% *butt* | rounded | squared\n");

/* dashed (gp_use_dashed): yes/no (true/false)

* default: yes */

fprintf(gpoutfile, " dashed=%s, %% *yes* | no\n", CONTEXT_params.dashed ? "yes" : "no");

/* dashlength (gp_scale_dashlength): 1.0 */

fprintf(gpoutfile, " dashlength=%g, %% scaling factor for dash lengths\n", CONTEXT_params.scale_dashlength);

/* linewidth (gp_scale_linewidth): 1.0 */

fprintf(gpoutfile, " linewidth=%g, %% scaling factor for line widths (1.0 means 0.5bp)\n", CONTEXT_params.scale_linewidth);

/* fontscale (gp_scale_text): 1.0 */

/* written out just for reference - it's commented out since it needs to be part of graphic

and affects estimation of label sizes */

fprintf(gpoutfile, " %%fontscale=%g, %% scaling factor for text labels\n", CONTEXT_params.scale_text);

/* points (gp_points_with): metapost/tex (gp_points_with_metapost/gp_points_with_tex)

* default: metapost */

fprintf(gpoutfile, " points=%s, %% *metapost* | tex (Should points be drawn with MetaPost or TeX?)\n",

CONTEXT_params.points == CONTEXT_POINTS_WITH_METAPOST ? "metapost" : "tex");

/* images

* default: inline */

fprintf(gpoutfile, " images=%s] %% *inline* | external (inline only works in MKIV, external requires png support in gnuplot)\n",

CONTEXT_images == CONTEXT_IMAGES_INLINE ? "inline" : "external");

/*----------------*

* end of options *

*----------------*/

fputs("\n\\starttext\n\n", gpoutfile);

} else {

/* Sorry, nothing! In non-standalone graphic, parameters make no sense.

* Setup everything in the file which includes such a graphic instead.

*/

}

}

/* ***************

* CONTEXT_reset *

* ***************

*

* finish writing the file

*/

TERM_PUBLIC void

CONTEXT_reset()

{

/* we only have to end the document if this is a stand-alone graphic */

if (CONTEXT_params.standalone) {

fputs("\\stoptext\n", gpoutfile);

} else {

/* This means that any subsequent plots to the same file will be ignored.

* I don't like that - gnuplot should delete the old contents instead,

* just as it does in case of PNG or PDF -

* but it will be at least consistent with standalone graphics that way

*/

fputs("\\endinput\n", gpoutfile);

}

/* deallocate image name if present */

if (CONTEXT_image_filename) {

free(CONTEXT_image_filename);

CONTEXT_image_filename = NULL;

CONTEXT_image_filename_length = 0;

CONTEXT_image_filename_start = 0;

};

}

/* **************

* CONTEXT_text *

* **************

*

* Ends the current graphic.

*/

TERM_PUBLIC void

CONTEXT_text()

{

/* close and draw the current path first */

if (CONTEXT_path_count > 0)

CONTEXT_endpath();

fprintf(gpoutfile, "setbounds currentpicture to unitsquare xyscaled (w,h);\n");

/* standalone graphic is a whole-page graphic */

if (CONTEXT_params.standalone) {

fputs("\\stopGNUPLOTpage\n", gpoutfile);

/* otherwise we define a MPgraphic to be included later */

} else {

fputs("\\stopGNUPLOTgraphic\n", gpoutfile);

}

}

/* ******************

* CONTEXT_graphics *

* ******************

*

* Starts a new graphic.

*/

TERM_PUBLIC void

CONTEXT_graphics()

{

/* standalone graphic is a whole-page graphic */

if (CONTEXT_params.standalone) {

fprintf(gpoutfile, "\\startGNUPLOTpage %% Graphic Nr. %d\n", ++CONTEXT_counter);

/* otherwise we define a MPgraphic to be included later */

} else {

/* the first parameter holds the graphic number */

fprintf(gpoutfile, "\\startGNUPLOTgraphic[%d]\n", ++CONTEXT_counter);

}

fprintf(gpoutfile, "string gnuplotversion; gnuplotversion := \"%s\";\n", gnuplot_version);

fprintf(gpoutfile, "string termversion; termversion := \"%s\";\n", CONTEXT_term_version);

/*

* MetaPost can only handle numbers up to 4096. Too high resolution

* would thus result in number overflow, that's why we scale down all the

* integers from gnuplot by 1000 and multiply those numbers later by

* appropriate scaling factor 'a' to get the proper dimensions.

*/

fprintf(gpoutfile, "%% scaling factor, width and height of the figure\na := 1cm; w := %.3fa; h := %.3fa; %% (%g%s, %g%s)\n",

CONTEXT_params.xsize * ((CONTEXT_params.unit == INCHES) ? 2.54 : 1), /* cm */

CONTEXT_params.ysize * ((CONTEXT_params.unit == INCHES) ? 2.54 : 1), /* cm */

CONTEXT_params.xsize, (CONTEXT_params.unit == INCHES) ? "in" : "cm",

CONTEXT_params.ysize, (CONTEXT_params.unit == INCHES) ? "in" : "cm");

/* TODO: the following if-else could be slightly nicer */

if (CONTEXT_images == CONTEXT_IMAGES_INLINE) {

fprintf(gpoutfile, "%% temporary variable for storing the path and images\nsave p, img, ima; path p; string img, ima;\n");

} else {

fprintf(gpoutfile, "%% temporary variable for storing the path\nsave p; path p;\n");

}

fprintf(gpoutfile, "%% -------------------------\n");

fprintf(gpoutfile, "%% Different initialisations\n");

fprintf(gpoutfile, "%% -------------------------\n");

fprintf(gpoutfile, "%% for additional user-defined settings\ngp_setup_before;\n");

/* needed (depends on terminal settings & needs to be passed) */

fprintf(gpoutfile, "%% text scaling factor for the whole figure\n");

fprintf(gpoutfile, "gp_scale_text := %g;\n", CONTEXT_params.scale_text);

fprintf(gpoutfile, "%% pointsize scaling factor\n");

fprintf(gpoutfile, "gp_set_pointsize(%g);\n", CONTEXT_old_pointsize);

/* needed (provided by terminal) */

fprintf(gpoutfile, "%% linewidth scaling factor for individual lines\n");

fprintf(gpoutfile, "gp_set_linewidth(%g);\n", CONTEXT_old_linewidth);

fprintf(gpoutfile, "%% for additional user-defined settings\ngp_setup_after;\n");

fprintf(gpoutfile, "%% -------------------------\n");

/* since palette is initialized only once, subsequent plots wouldn't see it

* unless we write it on the top of relevant plots explicitly */

if (is_plot_with_palette()) {