Function gmtplot_latex_eps

src/gmt_plot.c:320–469

}

GMT_LOCAL unsigned char * gmtplot_latex_eps (struct GMT_CTRL *GMT, struct GMT_FONT *F, const char *string, struct imageinfo *h) {
	/* Convert a string containing LaTeX syntax to an EPS image */
	unsigned int i, o;
	int error = 0;
	char *text = NULL, *font, *code;
	char tmpdir[PATH_MAX] = {""}, here[PATH_MAX] = {""}, file[PATH_MAX] = {""}, cmd[PATH_MAX] = {""};
	unsigned char *picture = NULL;
	FILE *fp = NULL;
	struct GMTAPI_CTRL *API = GMT->parent;

	if (gmtplot_has_title_breaks (GMT, string)) {
		GMT_Report (API, GMT_MSG_ERROR, "LaTeX expressions are only allowed in single-line strings\n");
		return NULL;
	}

	if (gmt_check_executable (GMT, "latex", "--version", NULL, NULL)) {
		GMT_Report (API, GMT_MSG_DEBUG, "latex found.\n");
	}
	else {
		GMT_Report (API, GMT_MSG_ERROR, "latex is not installed or not in your executable path - cannot process LaTeX to DVI.\n");
		return NULL;
	}
	if (gmt_check_executable (GMT, "dvips", "--version", NULL, NULL)) {
		GMT_Report (API, GMT_MSG_DEBUG, "dvips found.\n");
	}
	else {
		GMT_Report (API, GMT_MSG_ERROR, "dvips is not installed or not in your executable path - cannot convert DVI to EPS.\n");
		return NULL;
	}

	/* Create unique directory for outputs, stored in tmpdir */

	if (gmt_create_tempdir (API, "gmt_latex", tmpdir))
		return NULL;

	/* Remember where we are */
	if (getcwd (here, PATH_MAX) == NULL) {
		GMT_Report (API, GMT_MSG_ERROR, "Unable to determine current working directory - exiting.\n");
		return NULL;
	}
	gmt_replace_backslash_in_path (here);
	/* Use tmpdir as the current directory */
	if (chdir (tmpdir)) {
		GMT_Report (API, GMT_MSG_ERROR, "Unable to change directory to %s - exiting.\n", tmpdir);
		return NULL;
	}
	/* Create LaTeX file */
	sprintf (file, "gmt_eq.tex");
	if ((fp = fopen (file, "w")) == NULL) {
		GMT_Report (API, GMT_MSG_ERROR, "gmtplot_latex_eps: Could not create LaTeX file %s.\n", file);
		return NULL;
	}

	/* Replace any @[ or <math> ... </math> with $ */
	text = strdup (string);
	for (i = o = 0; i < strlen (string); i++) {
		if (string[i] == '@' && string[i+1] == '[')
			text[o++] = '$', i++;