#!/usr/bin/python ''' @author: Manuel F Martinez @organization: Bashlinux @copyright: Copyright (c) 2012 Bashlinux @license: GPL ''' try: import Image except ImportError: from PIL import Image import qrcode import time from constants import * from exceptions import * class Escpos: """ ESC/POS Printer object """ device = None def _check_image_size(self, size): """ Check and fix the size of the image to 32 bits """ if size % 32 == 0: return (0, 0) else: image_border = 32 - (size % 32) if (image_border % 2) == 0: return (image_border / 2, image_border / 2) else: 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], 0) self._raw(buffer.decode('hex')) buffer = "" while i < len(line): hex_string = int(line[i:i+8],2) buffer += "%02X" % hex_string i += 8 cont += 1 if cont % 4 == 0: self._raw(buffer.decode("hex")) buffer = "" cont = 0 def _convert_image(self, im): """ Parse image and prepare it to a printable format """ pixels = [] pix_line = "" im_left = "" im_right = "" 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 ") if im.size[1] > 255: raise ImageSizeError() im_border = self._check_image_size(im.size[0]) for i in range(im_border[0]): im_left += "0" for i in range(im_border[1]): im_right += "0" for y in range(im.size[1]): img_size[1] += 1 pix_line += im_left img_size[0] += im_border[0] for x in range(im.size[0]): img_size[0] += 1 RGB = im.getpixel((x, y)) im_color = (RGB[0] + RGB[1] + RGB[2]) im_pattern = "1X0" pattern_len = len(im_pattern) switch = (switch - 1 ) * (-1) for x in range(pattern_len): if im_color <= (255 * 3 / pattern_len * (x+1)): if im_pattern[x] == "X": pix_line += "%d" % switch else: pix_line += im_pattern[x] break elif im_color > (255 * 3 / pattern_len * pattern_len) and im_color <= (255 * 3): pix_line += im_pattern[-1] break pix_line += im_right img_size[0] += im_border[1] self._print_image(pix_line, img_size) def image(self,path_img): """ Open image file """ im_open = Image.open(path_img) im = im_open.convert("RGB") # Convert the RGB image in printable image self._convert_image(im) 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) qr_code.make(fit=True) qr_img = qr_code.make_image() im = qr_img._img.convert("RGB") # Convert the RGB image in printable image self._convert_image(im) def barcode(self, code, bc, width, height, pos, font): """ Print Barcode """ # Align Bar Code() self._raw(TXT_ALIGN_CT) # Height if height >=2 or height <=6: self._raw(BARCODE_HEIGHT) else: raise BarcodeSizeError() # Width 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 self._raw(BARCODE_FONT_A) # Position if pos.upper() == "OFF": self._raw(BARCODE_TXT_OFF) elif pos.upper() == "BOTH": self._raw(BARCODE_TXT_BTH) elif pos.upper() == "ABOVE": self._raw(BARCODE_TXT_ABV) else: # DEFAULT POSITION: BELOW self._raw(BARCODE_TXT_BLW) # Type if bc.upper() == "UPC-A": self._raw(BARCODE_UPC_A) elif bc.upper() == "UPC-E": self._raw(BARCODE_UPC_E) elif bc.upper() == "EAN13": self._raw(BARCODE_EAN13) elif bc.upper() == "EAN8": self._raw(BARCODE_EAN8) elif bc.upper() == "CODE39": self._raw(BARCODE_CODE39) elif bc.upper() == "ITF": self._raw(BARCODE_ITF) elif bc.upper() == "NW7": self._raw(BARCODE_NW7) else: raise BarcodeTypeError() # Print Code if code: self._raw(code) else: raise exception.BarcodeCodeError() def text(self, txt): """ Print alpha-numeric text """ if txt: self._raw(txt) else: raise TextError() def set(self, align='left', font='a', type='normal', width=1, height=1): """ Set text properties """ # Width if height != 2 and width != 2: # DEFAULT SIZE: NORMAL self._raw(TXT_NORMAL) if height == 2: self._raw(TXT_2HEIGHT) if width == 2: self._raw(TXT_2WIDTH) if height == 2 and width == 2: self._raw(TXT_4SQUARE) # Type if type.upper() == "B": self._raw(TXT_BOLD_ON) self._raw(TXT_UNDERL_OFF) elif type.upper() == "U": self._raw(TXT_BOLD_OFF) self._raw(TXT_UNDERL_ON) elif type.upper() == "U2": self._raw(TXT_BOLD_OFF) self._raw(TXT_UNDERL2_ON) self._raw(TXT_ITALIC_OFF) elif type.upper() == "BU": self._raw(TXT_BOLD_ON) self._raw(TXT_UNDERL_ON) elif type.upper() == "BU2": self._raw(TXT_BOLD_ON) self._raw(TXT_UNDERL2_ON) elif type.upper == "NORMAL": self._raw(TXT_BOLD_OFF) self._raw(TXT_UNDERL_OFF) # Font if font.upper() == "B": self._raw(TXT_FONT_B) else: # DEFAULT FONT: A self._raw(TXT_FONT_A) # Align if align.upper() == "CENTER": self._raw(TXT_ALIGN_CT) elif align.upper() == "RIGHT": self._raw(TXT_ALIGN_RT) elif align.upper() == "LEFT": self._raw(TXT_ALIGN_LT) def cut(self, mode=''): """ Cut paper """ # Fix the size between last line and cut # TODO: handle this with a line feed self._raw("\n\n\n\n\n\n") if mode.upper() == "PART": self._raw(PAPER_PART_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: self._raw(CD_KICK_2) elif pin == 5: self._raw(CD_KICK_5) else: raise CashDrawerError() def hw(self, hw): """ Hardware operations """ if hw.upper() == "INIT": self._raw(HW_INIT) elif hw.upper() == "SELECT": self._raw(HW_SELECT) elif hw.upper() == "RESET": self._raw(HW_RESET) else: # DEFAULT: DOES NOTHING pass def control(self, ctl): """ Feed control sequences """ if ctl.upper() == "LF": self._raw(CTL_LF) elif ctl.upper() == "FF": self._raw(CTL_FF) elif ctl.upper() == "CR": self._raw(CTL_CR) elif ctl.upper() == "HT": self._raw(CTL_HT) elif ctl.upper() == "VT": self._raw(CTL_VT)