* lgl-barcode-render-to-cairo.c
* Copyright (C) 2010 Jim Evins <evins@snaught.com>.
*
- * This file is part of gLabels.
+ * This file is part of libglbarcode.
*
- * gLabels is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
+ * libglbarcode is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
- * gLabels is distributed in the hope that it will be useful,
+ * libglbarcode 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.
+ * GNU Lesser General Public License for more details.
*
- * You should have received a copy of the GNU General Public License
- * along with gLabels. If not, see <http://www.gnu.org/licenses/>.
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with libglbarcode. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
/****************************************************************************/
-/* Render barcode to cairo context. */
-/****************************************************************************/
+/**
+ * lgl_barcode_render_to_cairo:
+ * @bc: An #lglBarcode structure
+ * @cr: A #cairo_t context
+ *
+ * Render barcode to cairo context. Context should be prepared with desired
+ * translation and appropriate scale. Context should be translated such that
+ * the origin is at the desired location of the upper left hand corner of the
+ * barcode bounding box. Context should be scaled such that all dimensions
+ * are in points ( 1 point = 1/72 inch ) and that positive y coordinates
+ * go down the surface.
+ */
void
lgl_barcode_render_to_cairo (const lglBarcode *bc,
cairo_t *cr)
case LGL_BARCODE_SHAPE_RING:
ring = (lglBarcodeShapeRing *) shape;
- cairo_arc (cr, ring->x, ring->y, ring->radius, 0.0, 2 * M_PI);
+ cairo_arc (cr, ring->x, ring->y, ring->radius, 0.0, 2 * G_PI);
cairo_set_line_width (cr, ring->line_width);
cairo_stroke (cr);
}
+/****************************************************************************/
+/**
+ * lgl_barcode_render_to_cairo_path:
+ * @bc: An #lglBarcode structure
+ * @cr: A #cairo_t context
+ *
+ * Render barcode to cairo context, but only create a path to be filled or
+ * tested against. Context should be prepared with desired
+ * translation and appropriate scale. Context should be translated such that
+ * the origin is at the desired location of the upper left hand corner of the
+ * barcode bounding box. Context should be scaled such that all dimensions
+ * are in points ( 1 point = 1/72 inch ) and that positive y coordinates
+ * go down the surface.
+ */
+void
+lgl_barcode_render_to_cairo_path (const lglBarcode *bc,
+ cairo_t *cr)
+{
+ GList *p;
+
+ lglBarcodeShape *shape;
+ lglBarcodeShapeLine *line;
+ lglBarcodeShapeBox *box;
+ lglBarcodeShapeChar *bchar;
+ lglBarcodeShapeString *bstring;
+ lglBarcodeShapeRing *ring;
+ lglBarcodeShapeHexagon *hexagon;
+
+ PangoLayout *layout;
+ PangoFontDescription *desc;
+ gchar *cstring;
+ gdouble x_offset, y_offset;
+ gint iw, ih;
+ gdouble layout_width;
+
+
+ for (p = bc->shapes; p != NULL; p = p->next) {
+
+ shape = (lglBarcodeShape *)p->data;
+
+ switch (shape->type)
+ {
+
+ case LGL_BARCODE_SHAPE_LINE:
+ line = (lglBarcodeShapeLine *) shape;
+
+ cairo_rectangle (cr, line->x - line->width/2, line->y, line->width, line->length);
+
+ break;
+
+ case LGL_BARCODE_SHAPE_BOX:
+ box = (lglBarcodeShapeBox *) shape;
+
+ cairo_rectangle (cr, box->x, box->y, box->width, box->height);
+
+ break;
+
+ case LGL_BARCODE_SHAPE_CHAR:
+ bchar = (lglBarcodeShapeChar *) shape;
+
+ layout = pango_cairo_create_layout (cr);
+
+ desc = pango_font_description_new ();
+ pango_font_description_set_family (desc, BARCODE_FONT_FAMILY);
+ pango_font_description_set_size (desc, bchar->fsize * PANGO_SCALE * FONT_SCALE);
+ pango_layout_set_font_description (layout, desc);
+ pango_font_description_free (desc);
+
+ cstring = g_strdup_printf ("%c", bchar->c);
+ pango_layout_set_text (layout, cstring, -1);
+ g_free (cstring);
+
+ y_offset = 0.2 * bchar->fsize;
+
+ cairo_move_to (cr, bchar->x, bchar->y-y_offset);
+ pango_cairo_layout_path (cr, layout);
+
+ g_object_unref (layout);
+
+ break;
+
+ case LGL_BARCODE_SHAPE_STRING:
+ bstring = (lglBarcodeShapeString *) shape;
+
+ layout = pango_cairo_create_layout (cr);
+
+ desc = pango_font_description_new ();
+ pango_font_description_set_family (desc, BARCODE_FONT_FAMILY);
+ pango_font_description_set_size (desc, bstring->fsize * PANGO_SCALE * FONT_SCALE);
+ pango_layout_set_font_description (layout, desc);
+ pango_font_description_free (desc);
+
+ pango_layout_set_text (layout, bstring->string, -1);
+
+ pango_layout_get_size (layout, &iw, &ih);
+ layout_width = (gdouble)iw / (gdouble)PANGO_SCALE;
+
+ x_offset = layout_width / 2.0;
+ y_offset = 0.2 * bstring->fsize;
+
+ cairo_move_to (cr, (bstring->x - x_offset), (bstring->y - y_offset));
+ pango_cairo_layout_path (cr, layout);
+
+ g_object_unref (layout);
+
+ break;
+
+ case LGL_BARCODE_SHAPE_RING:
+ ring = (lglBarcodeShapeRing *) shape;
+
+ cairo_new_sub_path (cr);
+ cairo_arc (cr, ring->x, ring->y, ring->radius + ring->line_width/2, 0.0, 2 * G_PI);
+ cairo_close_path (cr);
+ cairo_new_sub_path (cr);
+ cairo_arc (cr, ring->x, ring->y, ring->radius - ring->line_width/2, 0.0, 2 * G_PI);
+ cairo_close_path (cr);
+ break;
+
+ case LGL_BARCODE_SHAPE_HEXAGON:
+ hexagon = (lglBarcodeShapeHexagon *) shape;
+
+ cairo_move_to (cr, hexagon->x, hexagon->y);
+ cairo_line_to (cr, hexagon->x + 0.433*hexagon->height, hexagon->y + 0.25*hexagon->height);
+ cairo_line_to (cr, hexagon->x + 0.433*hexagon->height, hexagon->y + 0.75*hexagon->height);
+ cairo_line_to (cr, hexagon->x, hexagon->y + hexagon->height);
+ cairo_line_to (cr, hexagon->x - 0.433*hexagon->height, hexagon->y + 0.75*hexagon->height);
+ cairo_line_to (cr, hexagon->x - 0.433*hexagon->height, hexagon->y + 0.25*hexagon->height);
+ cairo_close_path (cr);
+ break;
+
+ default:
+ g_assert_not_reached ();
+ break;
+
+ }
+
+ }
+
+}
+
+
/*
* Local Variables: -- emacs
projects / glabels / blobdiff