Function gmt_contlabel_save_begin

src/gmt_plot.c:7916–7947

}

int gmt_contlabel_save_begin (struct GMT_CTRL *GMT, struct GMT_CONTOUR *G) {
	int kind;
	uint64_t k, seg, dim[4] = {1, 1, GMT_SMALL_CHUNK, 3};	/* Single table with 1 segment and unknown rows, each with 3 columns and trailing text */
	char record[GMT_BUFSIZ] = {""};
	char *xname[2] = {"x", "lon"}, *yname[2] = {"y", "lat"};
	double angle = 0.0;
	struct GMT_CONTOUR_LINE *L = NULL;

	/* Save the lon, lat, angle, text for each annotation to specified file */

	kind = gmt_M_is_geographic (GMT, GMT_IN);
	if ((G->Out = GMT_Create_Data (GMT->parent, GMT_IS_DATASET, GMT_IS_POINT, GMT_WITH_STRINGS, dim, NULL, NULL, 0, 0, NULL)) == NULL) {
		GMT_Report (GMT->parent, GMT_MSG_ERROR, "Unable to create a dataset\n");
		return (GMT_MEMORY_ERROR);	/* Establishes data output */
	}
	/* Write lon, lat, angle, label record */
	snprintf (record, GMT_BUFSIZ, "# %s%s%s%sangle%slabel", xname[kind], GMT->current.setting.io_col_separator, yname[kind],
		GMT->current.setting.io_col_separator, GMT->current.setting.io_col_separator);
	GMT_Set_Comment (GMT->parent, GMT_IS_DATASET, GMT_COMMENT_IS_TEXT | GMT_COMMENT_IS_COMMAND, record, G->Out);
	G->Out->table[0]->segment[0]->n_rows = 0;
	for (seg = 0; seg < G->n_segments; seg++) {
		L = G->segment[seg];	/* Pointer to current segment */
		if (!L->annot || L->n_labels == 0) continue;
		for (k = 0; k < L->n_labels; k++) {
			angle = fmod (2.0 * (L->L[k].angle + 360.0), 360.0) / 2.0;		/* Get text line in 0-180 range */
			gmt_add_label_record (GMT, G->Out, L->L[k].x, L->L[k].y, angle, L->L[k].label);	/* Store text record */
		}
	}
	gmtlib_finalize_dataset (GMT, G->Out);
	return (GMT_NOERROR);
	/* To finish and close the file, call gmt_contlabel_save_end */
}

int gmt_contlabel_save_end (struct GMT_CTRL *GMT, struct GMT_CONTOUR *G) {
	/* Finalize this dataset and write it out */