def makeTag(serialNum, assetTag, outputfile):
""" create a single image with two barcodes in it
sized for individual labels, 62mmx28mm
"""
if (serialNum is None) and (assetTag is None):
raise Exception("must provide at least one value for label")
code39 = barcode.get_barcode_class('code39')
twoBarcodes = (serialNum is not None) and (assetTag is not None)
wrt = ImageWriter()
label = (696, 271) #pixels for a 62mmx28mm label
margin = 3 #mm
width = px2mm(label[0]) - 2 * margin #showable width in mm
if twoBarcodes:
modHeight = 7 # bardcode height
else:
modHeight = 14
#code39 5 bars, 4 spaces per symbol. 3 wide, 6 narrow, 3:1 ratio
#settings for the Serial number
#resize the width of a line to make them fit in the printable width
#16 modules per symbol
if serialNum is not None:
a = code39(serialNum, add_checksum=False)
wrt.set_options({
'text':
'SN: ' + a.code,
'text_distance':
0.5,
'quiet_zone':
0,
'module_height':
modHeight,
'module_width':
width / ((2 + len(a.get_fullcode())) * 16)
})
apil = wrt.render(a.build())
else:
apil = fake()
apil.size = (0, 0)
if assetTag is not None:
b = code39(assetTag, add_checksum=False)
#settings for the Asset Tag
wrt.set_options({
'text':
'TAG: ' + b.code,
'text_distance':
0.5,
'quiet_zone':
0,
'module_height':
modHeight,
'module_width':
width / ((2 + len(b.get_fullcode())) * 16)
})
bpil = wrt.render(b.build())
else:
bpil = fake()
bpil.size = (0, 0)
#print (apil.size)
#print (bpil.size)
if (apil.size[1] + bpil.size[1]) > label[1]:
raise Exception("images dont fit")
#create a custom canvas of the correct size
#paste both barcodes into it, aproximately centered
im = Image.new('RGB', label, 'white')
top = int((label[1] - (apil.size[1] + bpil.size[1])) / 2)
left = int((label[0] - apil.size[0]) / 2)
if serialNum is not None:
im.paste(apil,
(0 + left, top, apil.size[0] + left, top + apil.size[1]))
left = int((label[0] - bpil.size[0]) / 2)
if assetTag is not None:
im.paste(bpil, (0 + left, top + apil.size[1], bpil.size[0] + left,
top + apil.size[1] + bpil.size[1]))
im.save(outputfile, 'PNG')
