Add doctormo's barcode extension. Patch 1681456. Still need to make it work with the make-chinery for installation and distribution.

(bzr r2958)

1 files changed, 127 insertions, 0 deletions

diff --git a/share/extensions/Barcode/Base.py b/share/extensions/Barcode/Base.py
new file mode 100644
index 000000000..e8d5e5654
--- /dev/null
+++ b/share/extensions/Barcode/Base.py
@@ -0,0 +1,127 @@
+'''
+Copyright (C) 2007 Martin Owens
+
+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
+'''
+
+import itertools
+import sys
+
+class Barcode:
+	def __init__(self, param={}):
+		self.document = None
+		self.x = 0
+		self.y = 0
+
+		if param.has_key('document'):
+			self.document = param['document']
+		if param.has_key('x'):
+			self.x = param['x']
+		if param.has_key('y'):
+			self.y = param['y']
+
+		if param.has_key('height'):
+			self.height = param['height']
+		else:
+			self.height = 30
+
+		self.text   = param['text']
+		self.label  = self.text
+		self.string = self.encode( self.text )
+		if not self.string:
+			return
+		self.width  = len(self.string)
+		self.data   = self.graphicalArray(self.string)
+
+	def generate(self):
+		if not self.string or not self.data:
+			return
+
+		data = self.data;
+	
+		# create an SVG document if required
+#		if not self.document:
+#			self.document = UNKNOWN
+	
+		if not self.document:
+			sys.stderr.write("No document defined to add barcode to\n")
+			return
+
+		# We don't have svg documents so lets do something raw:
+		name  = 'barcode'
+
+		# Make sure that the id/name is inique
+		index = 0
+		while (self.document.getElementById(name)):
+			name = 'barcode' + str(index)
+			index = index + 1
+
+		# use an svg group element to contain the barcode
+		barcode = self.document.createElement('svg:g')
+		barcode.setAttribute('id', name)
+		barcode.setAttribute('style', 'fill: black;')
+
+		draw	= 1
+		wOffset = int(self.x)
+		id	  = 1
+
+		for datum in data:
+			# Datum 0 tells us what style of bar is to come next
+			style = self.getStyle(int(datum[0]))
+			# Datum 1 tells us what width in units,
+			# style tells us how wide a unit is
+			width = int(datum[1]) * int(style['width'])
+
+			if style['write']:
+				# Add height for styles such as EA8 where
+				# the barcode goes into the text
+				
+				rect = self.document.createElement('svg:rect')
+				rect.setAttribute('x',	  str(wOffset))
+				rect.setAttribute('y',	  str(style['top']))
+				rect.setAttribute('width',  str(width))
+				rect.setAttribute('height', str(style['height']))
+				rect.setAttribute('id', name + '_bar' + str(id))
+				barcode.appendChild(rect)
+			wOffset = int(wOffset) + int(width)
+			id	  = id + 1
+
+		barwidth = wOffset - int(self.x)
+		# Add text at the bottom of the barcode
+		text = self.document.createElement('svg:text')
+		text.setAttribute( 'x', str(int(self.x) + int(barwidth / 2)) )
+		text.setAttribute( 'y', str(int(self.height) + 10 + int(self.y)) )
+		text.setAttribute( 'style', 'font-size:' + self.fontSize() + 'px;text-align:center;text-anchor:middle;' )
+		text.setAttribute( 'xml:space', 'preserve' )
+		text.setAttribute( 'id', name + '_bottomtext' )
+
+		text.appendChild(self.document.createTextNode(str(self.label)))
+		barcode.appendChild(text)
+
+		return barcode
+
+	# Converts black and white markers into a space array
+	def graphicalArray(self, code):
+		return [(x,len(list(y))) for x, y in itertools.groupby(code)]
+
+	def getStyle(self, index):
+		result = { 'width' : 1, 'top' : int(self.y), 'write' : False }
+		if index==1: # Black Bar
+			result['height'] = int(self.height)
+			result['write']  = True
+		return result
+
+	def fontSize(self):
+		return '9'