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IMPROVE barcode printing 

* adds default values to the auxiliary parameters
* allows to suppress the centered alignment
This commit is contained in:
Patrick Kanzler 2016-01-14 14:51:26 +01:00
parent 713380baf9
commit 248ddf8456
1 changed files with 12 additions and 6 deletions
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18
escpos/escpos.py
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@ -314,12 +314,11 @@ class Escpos(object):
else: else:
raise CharCodeError() raise CharCodeError()
def barcode(self, code, bc, height, width, pos, font): def barcode(self, code, bc, height=64, width=3, pos="BELOW", font="A", align_ct=True):
""" Print Barcode """ Print Barcode
.. todo:: Documentation tells about default values. In fact no default values exist and supplying a default .. todo:: Add a method to check barcode codes. Alternatively or as an addition write explanations about each
value does not work. barcode-type.
.. todo:: Add a method to check barcode codes.
.. todo:: On TM-T88II width from 1 to 6 is accepted. Try to acquire command reference and correct the code. .. todo:: On TM-T88II width from 1 to 6 is accepted. Try to acquire command reference and correct the code.
.. todo:: Supplying pos does not have an effect for every barcode type. Check and document for which types this .. todo:: Supplying pos does not have an effect for every barcode type. Check and document for which types this
is true. is true.
@ -338,9 +337,11 @@ class Escpos(object):
If none is specified, the method raises :py:exc:`~escpos.exceptions.BarcodeTypeError`. If none is specified, the method raises :py:exc:`~escpos.exceptions.BarcodeTypeError`.
:param height: barcode height, has to be between 1 and 255 :param height: barcode height, has to be between 1 and 255
*default*: 64 *default*: 64
:type height: int
:param width: barcode width, has to be between 2 and 6 :param width: barcode width, has to be between 2 and 6
*default*: 3 *default*: 3
:param pos: where to place the text relative to the barcode, *default*: below :type width: int
:param pos: where to place the text relative to the barcode, *default*: BELOW
* ABOVE * ABOVE
* BELOW * BELOW
@ -352,12 +353,17 @@ class Escpos(object):
* A * A
* B * B
:param align_ct: If this parameter is True the barcode will be centered. Otherwise no alignment command will be
issued.
:type align_ct: bool
:raises: :py:exc:`~escpos.exceptions.BarcodeSizeError`, :raises: :py:exc:`~escpos.exceptions.BarcodeSizeError`,
:py:exc:`~escpos.exceptions.BarcodeTypeError`, :py:exc:`~escpos.exceptions.BarcodeTypeError`,
:py:exc:`~escpos.exceptions.BarcodeCodeError` :py:exc:`~escpos.exceptions.BarcodeCodeError`
""" """
# Align Bar Code() # Align Bar Code()
self._raw(TXT_ALIGN_CT) if align_ct:
self._raw(TXT_ALIGN_CT)
# Height # Height
if 1 <= height <= 255: if 1 <= height <= 255:
self._raw(BARCODE_HEIGHT + chr(height)) self._raw(BARCODE_HEIGHT + chr(height))