def datamatrix(data, cellsize=2, with_border=False):
"""Return a datamatrix's image data.
Powered by the Python library ``qrcode``. See this library's documentation
for more details.
Parameters
----------
data
Data to be encoded in the datamatrix
cellsize
size of the picture in inches (?)
with_border
If false, there will be no border or margin to the datamatrix image.
Returns
-------
image_base64_data
A string ``data:image/png;base64,xxxxxxxxx`` which you can provide as a
"src" parameter to a ``<img/>`` tag.
Examples:
---------
>>> data = datamatrix('EGF')
>>> html_data = '<img src="%s"/>' % data
"""
encoder = DataMatrixEncoder(data)
img_data = encoder.get_imagedata(cellsize=cellsize)
img = Image.open(BytesIO(img_data))
if not with_border:
img = img.crop(ImageOps.invert(img).getbbox())
return pil_to_html_imgdata(img)
def draw_datamatrix(self, text, x, y, size, anchor="C"):
e_datamatrix = DataMatrixEncoder(text)
img = ImageReader(io.BytesIO(e_datamatrix.get_imagedata()))
_x, _y = x - size / 2, y - size / 2
if "N" in str(anchor).upper(): _y = y - size
if "S" in str(anchor).upper(): _y = y
if "E" in str(anchor).upper(): _x = x - size
if "W" in str(anchor).upper(): _x = x
self.c.drawImage(img, _x, _y, *[size] * 2)
def barcode(self,
barcode_type,
value,
width=600,
height=100,
humanreadable=0):
if barcode_type != 'datamatrix':
return super(ReportAction,
self).barcode(barcode_type,
value,
width=width,
height=height,
humanreadable=humanreadable)
else:
try:
barcode = DataMatrixEncoder(value)
return barcode.get_imagedata(min(75, int(height)))
except (ValueError, AttributeError):
raise ValueError("Cannot convert into barcode.")
