setop/python-escpos
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REFACTOR style and PEP8, fixes #66

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Patrick Kanzler
2015-11-27 21:20:12 +01:00
parent 096445631f
commit 07d8e073ae
5 changed files with 128 additions and 152 deletions
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88
escpos/escpos.py
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@@ -12,41 +12,40 @@ except ImportError:
from PIL import Image
import qrcode
import time
from constants import *
from exceptions import *
class Escpos(object):
""" ESC/POS Printer object """
device = None
device = None
def _check_image_size(self, size):
@staticmethod
def _check_image_size(size):
""" Check and fix the size of the image to 32 bits """
if size % 32 == 0:
return (0, 0)
return 0, 0
else:
image_border = 32 - (size % 32)
if (image_border % 2) == 0:
return (image_border / 2, image_border / 2)
return image_border / 2, image_border / 2
else:
return (image_border / 2, (image_border / 2) + 1)
return image_border / 2, (image_border / 2) + 1
def _print_image(self, line, size):
""" Print formatted image """
i = 0
cont = 0
buffer = ""
self._raw(S_RASTER_N)
buffer = "%02X%02X%02X%02X" % (((size[0]/size[1])/8), 0, size[1]&0xff, size[1]>>8)
buffer = "%02X%02X%02X%02X" % (((size[0]/size[1])/8), 0, size[1] & 0xff, size[1] >> 8)
self._raw(buffer.decode('hex'))
buffer = ""
while i < len(line):
hex_string = int(line[i:i+8],2)
hex_string = int(line[i:i+8], 2)
buffer += "%02X" % hex_string
i += 8
cont += 1
@@ -55,19 +54,17 @@ class Escpos(object):
buffer = ""
cont = 0
def _convert_image(self, im):
""" Parse image and prepare it to a printable format """
pixels = []
pixels = []
pix_line = ""
im_left = ""
im_left = ""
im_right = ""
switch = 0
img_size = [ 0, 0 ]
switch = 0
img_size = [0, 0]
if im.size[0] > 512:
print ("WARNING: Image is wider than 512 and could be truncated at print time ")
print ("WARNING: Image is wider than 512 and could be truncated at print time ")
if im.size[1] > 0xffff:
raise ImageSizeError()
@@ -87,7 +84,7 @@ class Escpos(object):
im_color = (RGB[0] + RGB[1] + RGB[2])
im_pattern = "1X0"
pattern_len = len(im_pattern)
switch = (switch - 1 ) * (-1)
switch = (switch - 1) * (-1)
for x in range(pattern_len):
if im_color <= (255 * 3 / pattern_len * (x+1)):
if im_pattern[x] == "X":
@@ -97,30 +94,28 @@ class Escpos(object):
break
elif (255 * 3 / pattern_len * pattern_len) < im_color <= (255 * 3):
pix_line += im_pattern[-1]
break
break
pix_line += im_right
img_size[0] += im_border[1]
self._print_image(pix_line, img_size)
def image(self,path_img):
def image(self, path_img):
""" Open image file """
im_open = Image.open(path_img)
# Remove the alpha channel on transparent images
if im_open.mode == 'RGBA':
im_open.load()
im = Image.new("RGB", im_open.size, (255, 255, 255))
im.paste(im_open, mask=im_open.split()[3])
else:
im = im_open.convert("RGB")
# Remove the alpha channel on transparent images
if im_open.mode == 'RGBA':
im_open.load()
im = Image.new("RGB", im_open.size, (255, 255, 255))
im.paste(im_open, mask=im_open.split()[3])
else:
im = im_open.convert("RGB")
# Convert the RGB image in printable image
self._convert_image(im)
def qr(self,text):
def qr(self, text):
""" Print QR Code for the provided string """
qr_code = qrcode.QRCode(version=4, box_size=4, border=1)
qr_code.add_data(text)
@@ -131,8 +126,7 @@ class Escpos(object):
# Convert the RGB image in printable image
self._convert_image(im)
def charcode(self,code):
def charcode(self, code):
""" Set Character Code Table """
if code.upper() == "USA":
self._raw(CHARCODE_PC437)
@@ -184,19 +178,19 @@ class Escpos(object):
# Align Bar Code()
self._raw(TXT_ALIGN_CT)
# Height
if height >=2 or height <=6:
if height >= 2 or height <= 6:
self._raw(BARCODE_HEIGHT)
else:
raise BarcodeSizeError()
# Width
if width >= 1 or width <=255:
if width >= 1 or width <= 255:
self._raw(BARCODE_WIDTH)
else:
raise BarcodeSizeError()
# Font
if font.upper() == "B":
self._raw(BARCODE_FONT_B)
else: # DEFAULT FONT: A
else: # DEFAULT FONT: A
self._raw(BARCODE_FONT_A)
# Position
if pos.upper() == "OFF":
@@ -205,9 +199,9 @@ class Escpos(object):
self._raw(BARCODE_TXT_BTH)
elif pos.upper() == "ABOVE":
self._raw(BARCODE_TXT_ABV)
else: # DEFAULT POSITION: BELOW
else: # DEFAULT POSITION: BELOW
self._raw(BARCODE_TXT_BLW)
# Type
# Type
if bc.upper() == "UPC-A":
self._raw(BARCODE_UPC_A)
elif bc.upper() == "UPC-E":
@@ -228,9 +222,8 @@ class Escpos(object):
if code:
self._raw(code)
else:
raise exception.BarcodeCodeError()
raise BarcodeCodeError()
def text(self, txt):
""" Print alpha-numeric text """
if txt:
@@ -238,7 +231,6 @@ class Escpos(object):
else:
raise TextError()
def set(self, align='left', font='a', type='normal', width=1, height=1, density=9):
""" Set text properties """
# Width
@@ -251,7 +243,7 @@ class Escpos(object):
elif width == 2 and height != 2:
self._raw(TXT_NORMAL)
self._raw(TXT_2WIDTH)
else: # DEFAULT SIZE: NORMAL
else: # DEFAULT SIZE: NORMAL
self._raw(TXT_NORMAL)
# Type
if type.upper() == "B":
@@ -303,10 +295,9 @@ class Escpos(object):
self._raw(PD_P37)
elif density == 8:
self._raw(PD_P50)
else:# DEFAULT: DOES NOTHING
else: # DEFAULT: DOES NOTHING
pass
def cut(self, mode=''):
""" Cut paper """
# Fix the size between last line and cut
@@ -314,10 +305,9 @@ class Escpos(object):
self._raw("\n\n\n\n\n\n")
if mode.upper() == "PART":
self._raw(PAPER_PART_CUT)
else: # DEFAULT MODE: FULL CUT
else: # DEFAULT MODE: FULL CUT
self._raw(PAPER_FULL_CUT)
def cashdraw(self, pin):
""" Send pulse to kick the cash drawer """
if pin == 2:
@@ -327,7 +317,6 @@ class Escpos(object):
else:
raise CashDrawerError()
def hw(self, hw):
""" Hardware operations """
if hw.upper() == "INIT":
@@ -336,17 +325,16 @@ class Escpos(object):
self._raw(HW_SELECT)
elif hw.upper() == "RESET":
self._raw(HW_RESET)
else: # DEFAULT: DOES NOTHING
else: # DEFAULT: DOES NOTHING
pass
def control(self, ctl, pos=4):
""" Feed control sequences """
# Set tab positions
if pos < 1 or pos > 16:
raise TabError()
else:
self._raw("".join([CTL_SET_HT,hex(pos)]))
self._raw("".join([CTL_SET_HT, hex(pos)]))
# Set position
if ctl.upper() == "LF":
self._raw(CTL_LF)