322 lines
9.6 KiB
Python
322 lines
9.6 KiB
Python
#!/usr/bin/python
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'''
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@author: Manuel F Martinez <manpaz@bashlinux.com>
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@organization: Bashlinux
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@copyright: Copyright (c) 2012 Bashlinux
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@license: GPL
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'''
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import Image
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import qrcode
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import time
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import copy
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from constants import *
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from exceptions import *
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class Escpos:
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""" ESC/POS Printer object """
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device = None
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encoding = None
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def _check_image_size(self, size):
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""" Check and fix the size of the image to 32 bits """
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if size % 32 == 0:
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return (0, 0)
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else:
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image_border = 32 - (size % 32)
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if (image_border % 2) == 0:
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return (image_border / 2, image_border / 2)
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else:
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return (image_border / 2, (image_border / 2) + 1)
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def _print_image(self, line, size):
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""" Print formatted image """
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i = 0
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cont = 0
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buffer = ""
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self._raw(S_RASTER_N)
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buffer = "%02X%02X%02X%02X" % (((size[0]/size[1])/8), 0, size[1], 0)
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self._raw(buffer.decode('hex'))
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buffer = ""
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while i < len(line):
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hex_string = int(line[i:i+8],2)
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buffer += "%02X" % hex_string
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i += 8
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cont += 1
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if cont % 4 == 0:
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self._raw(buffer.decode("hex"))
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buffer = ""
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cont = 0
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def _convert_image(self, im):
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""" Parse image and prepare it to a printable format """
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pixels = []
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pix_line = ""
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im_left = ""
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im_right = ""
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switch = 0
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img_size = [ 0, 0 ]
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if im.size[0] > 512:
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print "WARNING: Image is wider than 512 and could be truncated at print time "
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if im.size[1] > 255:
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raise ImageSizeError()
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im_border = self._check_image_size(im.size[0])
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for i in range(im_border[0]):
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im_left += "0"
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for i in range(im_border[1]):
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im_right += "0"
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for y in range(im.size[1]):
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img_size[1] += 1
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pix_line += im_left
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img_size[0] += im_border[0]
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for x in range(im.size[0]):
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img_size[0] += 1
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RGB = im.getpixel((x, y))
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im_color = (RGB[0] + RGB[1] + RGB[2])
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im_pattern = "1X0"
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pattern_len = len(im_pattern)
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switch = (switch - 1 ) * (-1)
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for x in range(pattern_len):
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if im_color <= (255 * 3 / pattern_len * (x+1)):
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if im_pattern[x] == "X":
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pix_line += "%d" % switch
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else:
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pix_line += im_pattern[x]
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break
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elif im_color > (255 * 3 / pattern_len * pattern_len) and im_color <= (255 * 3):
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pix_line += im_pattern[-1]
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break
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pix_line += im_right
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img_size[0] += im_border[1]
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self._print_image(pix_line, img_size)
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def image(self,path_img):
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""" Open image file """
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im_open = Image.open(path_img)
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im = im_open.convert("RGB")
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# Convert the RGB image in printable image
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self._convert_image(im)
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def qr(self,text):
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""" Print QR Code for the provided string """
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qr_code = qrcode.QRCode(version=4, box_size=4, border=1)
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qr_code.add_data(text)
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qr_code.make(fit=True)
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qr_img = qr_code.make_image()
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im = qr_img._img.convert("RGB")
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# Convert the RGB image in printable image
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self._convert_image(im)
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def barcode(self, code, bc, width, height, pos, font):
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""" Print Barcode """
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# Align Bar Code()
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self._raw(TXT_ALIGN_CT)
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# Height
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if height >=2 or height <=6:
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self._raw(BARCODE_HEIGHT)
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else:
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raise BarcodeSizeError()
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# Width
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if width >= 1 or width <=255:
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self._raw(BARCODE_WIDTH)
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else:
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raise BarcodeSizeError()
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# Font
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if font.upper() == "B":
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self._raw(BARCODE_FONT_B)
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else: # DEFAULT FONT: A
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self._raw(BARCODE_FONT_A)
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# Position
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if pos.upper() == "OFF":
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self._raw(BARCODE_TXT_OFF)
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elif pos.upper() == "BOTH":
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self._raw(BARCODE_TXT_BTH)
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elif pos.upper() == "ABOVE":
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self._raw(BARCODE_TXT_ABV)
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else: # DEFAULT POSITION: BELOW
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self._raw(BARCODE_TXT_BLW)
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# Type
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if bc.upper() == "UPC-A":
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self._raw(BARCODE_UPC_A)
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elif bc.upper() == "UPC-E":
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self._raw(BARCODE_UPC_E)
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elif bc.upper() == "EAN13":
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self._raw(BARCODE_EAN13)
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elif bc.upper() == "EAN8":
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self._raw(BARCODE_EAN8)
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elif bc.upper() == "CODE39":
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self._raw(BARCODE_CODE39)
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elif bc.upper() == "ITF":
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self._raw(BARCODE_ITF)
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elif bc.upper() == "NW7":
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self._raw(BARCODE_NW7)
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else:
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raise BarcodeTypeError()
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# Print Code
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if code:
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self._raw(code)
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else:
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raise exception.BarcodeCodeError()
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def text(self,txt):
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""" Print Utf8 encoded alpha-numeric text """
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try:
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txt = txt.decode('utf-8')
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except:
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try:
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txt = txt.decode('utf-16')
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except:
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pass
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def encode_char(char):
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encoded = ''
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encoding = self.encoding
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encodings = {
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'cp437': TXT_ENC_PC437,
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'cp850': TXT_ENC_PC850,
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'cp852': TXT_ENC_PC852,
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'cp858': TXT_ENC_PC858,
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'cp865': TXT_ENC_PC860,
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'cp863': TXT_ENC_PC863,
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'cp865': TXT_ENC_PC865,
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'cp866': TXT_ENC_PC866,
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}
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remaining = copy.copy(encodings)
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if not encoding :
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encoding = 'cp437'
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while True:
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try:
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encoded = char.encode(encoding)
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break
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except ValueError:
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if encoding in remaining:
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del remaining[encoding]
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if len(remaining) >= 1:
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encoding = remaining.items()[0][0]
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else:
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print 'COULD NOT ENCODE:',char, char.__repr__()
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encoded = '\xA8' # could not encode, output error character
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break;
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if encoding != self.encoding:
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self.encoding = encoding
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encoded = encodings[encoding] + encoded
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return encoded
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buffer = ''
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for char in txt:
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buffer += encode_char(char)
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if buffer:
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self._raw(buffer)
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def set(self, align='left', font='a', type='normal', width=1, height=1):
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""" Set text properties """
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# Align
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if align.upper() == "CENTER":
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self._raw(TXT_ALIGN_CT)
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elif align.upper() == "RIGHT":
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self._raw(TXT_ALIGN_RT)
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elif align.upper() == "LEFT":
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self._raw(TXT_ALIGN_LT)
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# Font
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if font.upper() == "B":
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self._raw(TXT_FONT_B)
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else: # DEFAULT FONT: A
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self._raw(TXT_FONT_A)
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# Type
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if type.upper() == "B":
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self._raw(TXT_BOLD_ON)
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self._raw(TXT_UNDERL_OFF)
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elif type.upper() == "U":
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self._raw(TXT_BOLD_OFF)
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self._raw(TXT_UNDERL_ON)
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elif type.upper() == "U2":
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self._raw(TXT_BOLD_OFF)
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self._raw(TXT_UNDERL2_ON)
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elif type.upper() == "BU":
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self._raw(TXT_BOLD_ON)
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self._raw(TXT_UNDERL_ON)
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elif type.upper() == "BU2":
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self._raw(TXT_BOLD_ON)
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self._raw(TXT_UNDERL2_ON)
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elif type.upper == "NORMAL":
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self._raw(TXT_BOLD_OFF)
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self._raw(TXT_UNDERL_OFF)
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# Width
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if width == 2 and height != 2:
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self._raw(TXT_NORMAL)
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self._raw(TXT_2WIDTH)
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elif height == 2 and width != 2:
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self._raw(TXT_NORMAL)
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self._raw(TXT_2HEIGHT)
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elif height == 2 and width == 2:
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self._raw(TXT_2WIDTH)
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self._raw(TXT_2HEIGHT)
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else: # DEFAULT SIZE: NORMAL
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self._raw(TXT_NORMAL)
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def cut(self, mode=''):
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""" Cut paper """
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# Fix the size between last line and cut
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# TODO: handle this with a line feed
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self._raw("\n\n\n\n\n\n")
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if mode.upper() == "PART":
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self._raw(PAPER_PART_CUT)
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else: # DEFAULT MODE: FULL CUT
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self._raw(PAPER_FULL_CUT)
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def cashdraw(self, pin):
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""" Send pulse to kick the cash drawer """
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if pin == 2:
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self._raw(CD_KICK_2)
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elif pin == 5:
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self._raw(CD_KICK_5)
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else:
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raise CashDrawerError()
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def hw(self, hw):
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""" Hardware operations """
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if hw.upper() == "INIT":
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self._raw(HW_INIT)
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elif hw.upper() == "SELECT":
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self._raw(HW_SELECT)
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elif hw.upper() == "RESET":
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self._raw(HW_RESET)
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else: # DEFAULT: DOES NOTHING
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pass
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def control(self, ctl):
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""" Feed control sequences """
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if ctl.upper() == "LF":
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self._raw(CTL_LF)
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elif ctl.upper() == "FF":
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self._raw(CTL_FF)
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elif ctl.upper() == "CR":
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self._raw(CTL_CR)
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elif ctl.upper() == "HT":
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self._raw(CTL_HT)
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elif ctl.upper() == "VT":
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self._raw(CTL_VT)
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