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#
# Copyright (c) 1996-2000 Tyler C. Sarna <tsarna@sarna.org>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
# must display the following acknowledgement:
# This product includes software developed by Tyler C. Sarna.
# 4. Neither the name of the author nor the names of contributors
# may be used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
__version__ = '0.9'
def getCodes():
"""Returns a dict mapping code names to widgets"""
from widgets import (BarcodeI2of5,
BarcodeCode128,
BarcodeStandard93,
BarcodeExtended93,
BarcodeStandard39,
BarcodeExtended39,
BarcodeMSI,
BarcodeCodabar,
BarcodeCode11,
BarcodeFIM,
BarcodePOSTNET)
#newer codes will typically get their own module
from eanbc import Ean13BarcodeWidget, Ean8BarcodeWidget
#the module exports a dictionary of names to widgets, to make it easy for
#apps and doc tools to display information about them.
codes = {}
for widget in (
BarcodeI2of5,
BarcodeCode128,
BarcodeStandard93,
BarcodeExtended93,
BarcodeStandard39,
BarcodeExtended39,
BarcodeMSI,
BarcodeCodabar,
BarcodeCode11,
BarcodeFIM,
BarcodePOSTNET,
Ean13BarcodeWidget,
Ean8BarcodeWidget,
):
codeName = widget.codeName
codes[codeName] = widget
return codes
def getCodeNames():
"""Returns sorted list of supported bar code names"""
return sorted(getCodes().keys())
def createBarcodeDrawing(codeName, **options):
"""This creates and returns a drawing with a barcode.
"""
from reportlab.graphics.shapes import Drawing, Group
codes = getCodes()
bcc = codes[codeName]
width = options.pop('width',None)
height = options.pop('height',None)
isoScale = options.pop('isoScale',0)
kw = {}
for k,v in options.iteritems():
if k.startswith('_') or k in bcc._attrMap: kw[k] = v
bc = bcc(**kw)
#size it after setting the data
x1, y1, x2, y2 = bc.getBounds()
w = float(x2 - x1)
h = float(y2 - y1)
sx = width not in ('auto',None)
sy = height not in ('auto',None)
if sx or sy:
sx = sx and width/w or 1.0
sy = sy and height/h or 1.0
if isoScale:
if sx<1.0 and sy<1.0:
sx = sy = max(sx,sy)
else:
sx = sy = min(sx,sy)
w *= sx
h *= sy
else:
sx = sy = 1
#bc.x = -sx*x1
#bc.y = -sy*y1
d = Drawing(width=w,height=h,transform=[sx,0,0,sy,-sx*x1,-sy*y1])
d.add(bc, "_bc")
return d
def createBarcodeImageInMemory(codeName, **options):
"""This creates and returns barcode as an image in memory.
"""
d = createBarcodeDrawing(codeName, **options)
return d.asString(format)
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