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# pydmtx - Python wrapper for libdmtx
#
# Copyright (C) 2006 Dan Watson
# Copyright (C) 2007, 2008, 2009 Mike Laughton
# Copyright (C) 2008 Jonathan Lung
# Copyright (C) 2009 Simon Wood
#
# This library 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 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
# $Id: pydmtx.py 836 2009-04-27 22:48:44Z mblaughton $
import _pydmtx
try:
from PIL import Image, ImageDraw
_hasPIL = True
except ImportError:
_hasPIL = False
class DataMatrix (object):
DmtxUndefined = -1
# Scheme: values must be consistent with enum DmtxScheme
DmtxSchemeAutoFast = -2
DmtxSchemeAutoBest = -1
DmtxSchemeAscii = 0
DmtxSchemeC40 = 1
DmtxSchemeText = 2
DmtxSchemeX12 = 3
DmtxSchemeEdifact = 4
DmtxSchemeBase256 = 5
# Shape: values must be consistent with DmtxSymbol[Square|Rect]Auto
DmtxSymbolRectAuto = -3
DmtxSymbolSquareAuto = -2
DmtxSymbolShapeAuto = -1
DmtxSymbol10x10 = 0
DmtxSymbol12x12 = 1
DmtxSymbol14x14 = 2
DmtxSymbol16x16 = 3
DmtxSymbol18x18 = 4
DmtxSymbol20x20 = 5
DmtxSymbol22x22 = 6
DmtxSymbol24x24 = 7
DmtxSymbol26x26 = 8
DmtxSymbol32x32 = 9
DmtxSymbol36x36 = 10
DmtxSymbol40x40 = 11
DmtxSymbol44x44 = 12
DmtxSymbol48x48 = 13
DmtxSymbol52x52 = 14
DmtxSymbol64x64 = 15
DmtxSymbol72x72 = 16
DmtxSymbol80x80 = 17
DmtxSymbol88x88 = 18
DmtxSymbol96x96 = 19
DmtxSymbol104x104 = 20
DmtxSymbol120x120 = 21
DmtxSymbol132x132 = 22
DmtxSymbol144x144 = 23
DmtxSymbol8x18 = 24
DmtxSymbol8x32 = 25
DmtxSymbol12x26 = 26
DmtxSymbol12x36 = 27
DmtxSymbol16x36 = 28
DmtxSymbol16x48 = 29
def __init__( self, **kwargs ):
self._data = None
self._image = None
self._draw = None
self.width, self.height = 0, 0
self.results = ""
# defaults (only set mandatory values)
self.options = {
'module_size' : self.DmtxUndefined,
'margin_size' : self.DmtxUndefined,
'gap_size' : self.DmtxUndefined,
'scheme' : self.DmtxUndefined,
'shape' : self.DmtxUndefined
}
self.options.update(kwargs)
# make these read-only
data = property( lambda self: self._data )
image = property( lambda self: self._image )
# encoding methods
def encode( self, data, **kwargs ):
all_kwargs = self.options
all_kwargs.update(kwargs)
self._data = str(data)
_pydmtx.encode( self._data, len(self._data),
plotter=self._plot, start=self._start,
finish=self._finish,
**all_kwargs );
def save( self, path, fmt ):
if self._image is not None:
self._image.save( path, fmt )
def _start( self, width, height, context ):
self.width, self.height = width, height
self._image = Image.new( 'RGB', (width,height), (255,255,255) )
self._draw = ImageDraw.Draw( self._image )
def _plot( self, x, y, color, context ):
self._draw.point( (x,self.height-y-1), fill=color )
def _finish( self, context ):
del self._draw
self._draw = None
def decode( self, width, height, data, **kwargs):
all_kwargs = self.options
all_kwargs.update(kwargs)
self.results = _pydmtx.decode( width, height, data, **all_kwargs)
# return only the first message
return self.message(1)
def count( self ):
return len(self.results)
def message( self, ref ):
if (ref <= self.count() and ref > 0):
barcode = self.results[ref-1]
return barcode[0]
else:
return
def stats( self, ref ):
if (ref <= self.count() and ref > 0):
return self.results[ref-1]
else:
return
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