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