Initial import from Docker volume

tools/barcode.py

@@ -0,0 +1,67 @@
+# This file is part of Tryton.  The COPYRIGHT file at the top level of
+# this repository contains the full copyright notices and license terms.
+
+from io import BytesIO
+
+import barcode
+from barcode import PROVIDED_BARCODES as BARCODES
+from barcode.writer import ImageWriter, SVGWriter
+
+__all__ = ['BARCODES', 'generate_svg', 'generate_png']
+
+BARCODES = set(BARCODES) | {'ean', 'isbn'}
+
+
+def _generate(name, code, writer, **options):
+    output = BytesIO()
+    if name == 'ean':
+        name = {
+            14: 'ean14',
+            13: 'ean13',
+            12: 'upc',
+            8: 'ean8',
+            }[len(code)]
+    elif name == 'isbn':
+        name = {
+            13: 'isbn13',
+            10: 'isbn10',
+            }[len(code)]
+    Generator = barcode.get(name)
+    Generator(code, writer=writer).write(output, options=options)
+    return output
+
+
+def generate_svg(
+        name, code, width=0.2, height=15.0, border=6.5,
+        font_size=10, text_distance=5.0,
+        background='white', foreground='black'):
+    writer = SVGWriter()
+    options = dict(
+        module_width=width,
+        module_height=height,
+        quiet_zone=border,
+        font_size=font_size,
+        text_distance=text_distance,
+        background=background,
+        foreground=foreground)
+    return _generate(name, code, writer, **options)
+
+
+def generate_png(
+        name, code, width=2, height=150, border=6.5,
+        font_size=10, text_distance=5.0,
+        background='white', foreground='black'):
+    dpi = 300
+    width = width * 25.4 / dpi
+    height = height * 25.4 / dpi
+    writer = ImageWriter()
+    options = dict(
+        format='png',
+        module_with=width,
+        module_height=height,
+        quiet_zone=border,
+        font_size=font_size,
+        text_distance=text_distance,
+        background=background,
+        foreground=foreground)
+    return _generate(name, code, writer, **options)