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Diffstat (limited to 'glabels2/src/bc-iec16022.c')
| -rw-r--r-- | glabels2/src/bc-iec16022.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/glabels2/src/bc-iec16022.c b/glabels2/src/bc-iec16022.c new file mode 100644 index 0000000..8fb87fc --- /dev/null +++ b/glabels2/src/bc-iec16022.c @@ -0,0 +1,151 @@ +/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- */ + +/* + * (GLABELS) Label and Business Card Creation program for GNOME + * + * bc-iec16022.c: front-end to iec16022-library module + * + * Copyright (C) 2001-2006 Jim Evins <evins@snaught.com>. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <config.h> + +#include "bc-iec16022.h" + +#include <ctype.h> +#include <string.h> +#include <stdlib.h> +#include <glib/gmessages.h> + +#include "iec16022ecc200.h" + +#include "debug.h" + +/*========================================================*/ +/* Private macros and constants. */ +/*========================================================*/ +#define MIN_PIXEL_SIZE 1.0 + +/*===========================================*/ +/* Local function prototypes */ +/*===========================================*/ +static glBarcode *render_iec16022 (const gchar *grid, + gint i_width, + gint i_height, + gdouble w, + gdouble h); + +/*****************************************************************************/ +/* Generate intermediate representation of barcode. */ +/*****************************************************************************/ +glBarcode * +gl_barcode_iec16022_new (const gchar *id, + gboolean text_flag, + gboolean checksum_flag, + gdouble w, + gdouble h, + const gchar *digits) +{ + gchar *grid; + gint i_width, i_height; + glBarcode *gbc; + + if ( strlen (digits) == 0 ) + { + return NULL; + } + + i_width = 0; + i_height = 0; + + grid = (gchar *)iec16022ecc200 (&i_width, &i_height, NULL, + strlen (digits), (unsigned char *)digits, + NULL, NULL, NULL); + + /* now render with our custom back-end, + to create appropriate intermdediate format */ + gbc = render_iec16022 (grid, i_width, i_height, w, h); + + free (grid); + return gbc; +} + +/*-------------------------------------------------------------------------- + * PRIVATE. Render to glBarcode intermediate representation of barcode. + *--------------------------------------------------------------------------*/ +static glBarcode * +render_iec16022 (const gchar *grid, + gint i_width, + gint i_height, + gdouble w, + gdouble h) +{ + glBarcode *gbc; + glBarcodeLine *line; + gint x, y; + gdouble aspect_ratio, pixel_size; + + /* Treat requested size as a bounding box, scale to maintain aspect + * ratio while fitting it in this bounding box. */ + aspect_ratio = (gdouble)i_height / (gdouble)i_width; + if ( h > w*aspect_ratio ) { + h = w * aspect_ratio; + } else { + w = h / aspect_ratio; + } + + /* Now determine pixel size. */ + pixel_size = w / i_width; + if ( pixel_size < MIN_PIXEL_SIZE ) + { + pixel_size = MIN_PIXEL_SIZE; + } + + gbc = g_new0 (glBarcode, 1); + + /* Now traverse the code string and create a list of boxes */ + for ( y = i_height-1; y >= 0; y-- ) + { + + for ( x = 0; x < i_width; x++ ) + { + + if (*grid++) + { + line = g_new0 (glBarcodeLine, 1); + line->x = x*pixel_size + pixel_size/2.0; + line->y = y*pixel_size; + line->length = pixel_size; + line->width = pixel_size; + gbc->lines = g_list_append (gbc->lines, line); + } + + } + + } + + /* Fill in other info */ + gbc->height = i_height * pixel_size; + gbc->width = i_width * pixel_size; + +#if 0 + g_print ("w=%f, h=%f\n", gbc->width, gbc->height); +#endif + + return gbc; +} + |