Extensions. Barcode extension refactoring (see https://code.launchpad.net/~doctormo...

[inkscape.git] / share / extensions / Barcode / Code25i.py

diff --git a/share/extensions/Barcode/Code25i.py b/share/extensions/Barcode/Code25i.py
new file mode 100644 (file)
index 0000000..518a306
--- /dev/null
+++ b/share/extensions/Barcode/Code25i.py
@@ -0,0 +1,78 @@
+#
+# Copyright (C) 2010 Geoffrey Mosini
+#
+# 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
+#
+"""
+Generate barcodes for Code25-interleaved 2 of 5, for Inkscape.
+"""
+
+from Base import Barcode
+import sys
+
+# 1 means thick, 0 means thin
+encoding = {
+    '0' : '00110',
+    '1' : '10001',
+    '2' : '01001',
+    '3' : '11000', 
+    '4' : '00101',
+    '5' : '10100',
+    '6' : '01100',
+    '7' : '00011',
+    '8' : '10010',
+    '9' : '01010',
+    
+}
+
+# Start and stop code are already encoded into white (0) and black(1) bars
+start_code = '1010'
+stop_code = '1101'
+
+class Object(Barcode):
+    # Convert a text into string binary of black and white markers
+    def encode(self, number):
+        self.label = number
+
+        if not number.isdigit():
+            sys.stderr.write("CODE25 can only encode numbers.\n")
+            return
+
+        # Number of figures to encode must be even, a 0 is added to the left in case it's odd.
+        if len(number) % 2 > 0 :
+            number = '0' + number
+
+        # Number is encoded by pairs of 2 figures
+        size = len(number) / 2;
+        encoded = start_code;
+        for i in range(size):
+            # First in the pair is encoded in black (1), second in white (0)
+            black =  encoding[number[i*2]]
+            white = encoding[number[i*2+1]]
+            for j in range(5):
+                if black[j] == '1':
+                    encoded += '11'
+                else:
+                    encoded += '1'
+                if white[j] == '1':
+                    encoded += '00'
+                else:
+                    encoded += '0'
+
+        encoded += stop_code
+
+        self.inclabel = number
+        return encoded;
+