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# (c) 2008 Jerome Alet - <alet@librelogiciel.com> # Licensing terms : ReportLab's license. from reportlab.graphics.barcode.code39 import Standard39 from reportlab.lib import colors from reportlab.lib.units import cm from string import digits as string_digits from reportlab.lib.utils import ascii_uppercase class BaseLTOLabel(Standard39) : """ Base class for LTO labels. Specification taken from "IBM LTO Ultrium Cartridge Label Specification, Revision 3" available on May 14th 2008 from : http://www-1.ibm.com/support/docview.wss?rs=543&context=STCVQ6R&q1=ssg1*&uid=ssg1S7000429&loc=en_US&cs=utf-8&lang=en+en """ LABELWIDTH = 7.9 * cm LABELHEIGHT = 1.7 * cm LABELROUND = 0.15 * cm CODERATIO = 2.75 CODENOMINALWIDTH = 7.4088 * cm CODEBARHEIGHT = 1.11 * cm CODEBARWIDTH = 0.0432 * cm CODEGAP = CODEBARWIDTH CODELQUIET = 10 * CODEBARWIDTH CODERQUIET = 10 * CODEBARWIDTH def __init__(self, prefix="", number=None, subtype="1", border=None, checksum=False, availheight=None) : """ Initializes an LTO label. prefix : Up to six characters from [A-Z][0-9]. Defaults to "". number : Label's number or None. Defaults to None. subtype : LTO subtype string , e.g. "1" for LTO1. Defaults to "1". border : None, or the width of the label's border. Defaults to None. checksum : Boolean indicates if checksum char has to be printed. Defaults to False. availheight : Available height on the label, or None for automatic. Defaults to None. """ self.height = max(availheight, self.CODEBARHEIGHT) self.border = border if (len(subtype) != 1) \ or (subtype not in ascii_uppercase + string_digits) : raise ValueError("Invalid subtype '%s'" % subtype) if ((not number) and (len(prefix) > 6)) \ or not prefix.isalnum() : raise ValueError("Invalid prefix '%s'" % prefix) label = "%sL%s" % ((prefix + str(number or 0).zfill(6 - len(prefix)))[:6], subtype) if len(label) != 8 : raise ValueError("Invalid set of parameters (%s, %s, %s)" \ % (prefix, number, subtype)) self.label = label Standard39.__init__(self, label, ratio=self.CODERATIO, barHeight=self.height, barWidth=self.CODEBARWIDTH, gap=self.CODEGAP, lquiet=self.CODELQUIET, rquiet=self.CODERQUIET, quiet=True, checksum=checksum) def drawOn(self, canvas, x, y) : """Draws the LTO label onto the canvas.""" canvas.saveState() canvas.translate(x, y) if self.border : canvas.setLineWidth(self.border) canvas.roundRect(0, 0, self.LABELWIDTH, self.LABELHEIGHT, self.LABELROUND) Standard39.drawOn(self, canvas, (self.LABELWIDTH-self.CODENOMINALWIDTH)/2.0, self.LABELHEIGHT-self.height) canvas.restoreState() class VerticalLTOLabel(BaseLTOLabel) : """ A class for LTO labels with rectangular blocks around the tape identifier. """ LABELFONT = ("Helvetica-Bold", 14) BLOCKWIDTH = 1*cm BLOCKHEIGHT = 0.45*cm LINEWIDTH = 0.0125 NBBLOCKS = 7 COLORSCHEME = ("red", "yellow", "lightgreen", "lightblue", "grey", "orangered", "pink", "darkgreen", "orange", "purple") def __init__(self, *args, **kwargs) : """ Initializes the label. colored : boolean to determine if blocks have to be colorized. """ if "colored" in kwargs: self.colored = kwargs["colored"] del kwargs["colored"] else : self.colored = False kwargs["availheight"] = self.LABELHEIGHT-self.BLOCKHEIGHT BaseLTOLabel.__init__(self, *args, **kwargs) def drawOn(self, canvas, x, y) : """Draws some blocks around the identifier's characters.""" BaseLTOLabel.drawOn(self, canvas, x, y) canvas.saveState() canvas.setLineWidth(self.LINEWIDTH) canvas.setStrokeColorRGB(0, 0, 0) canvas.translate(x, y) xblocks = (self.LABELWIDTH-(self.NBBLOCKS*self.BLOCKWIDTH))/2.0 for i in range(self.NBBLOCKS) : (font, size) = self.LABELFONT newfont = self.LABELFONT if i == (self.NBBLOCKS - 1) : part = self.label[i:] (font, size) = newfont size /= 2.0 newfont = (font, size) else : part = self.label[i] canvas.saveState() canvas.translate(xblocks+(i*self.BLOCKWIDTH), 0) if self.colored and part.isdigit() : canvas.setFillColorRGB(*getattr(colors, self.COLORSCHEME[int(part)], colors.Color(1, 1, 1)).rgb()) else: canvas.setFillColorRGB(1, 1, 1) canvas.rect(0, 0, self.BLOCKWIDTH, self.BLOCKHEIGHT, fill=True) canvas.translate((self.BLOCKWIDTH+canvas.stringWidth(part, *newfont))/2.0, (self.BLOCKHEIGHT/2.0)) canvas.rotate(90.0) canvas.setFont(*newfont) canvas.setFillColorRGB(0, 0, 0) canvas.drawCentredString(0, 0, part) canvas.restoreState() canvas.restoreState() def test() : """Test this.""" from reportlab.pdfgen.canvas import Canvas from reportlab.lib import pagesizes canvas = Canvas("labels.pdf", pagesize=pagesizes.A4) canvas.setFont("Helvetica", 30) (width, height) = pagesizes.A4 canvas.drawCentredString(width/2.0, height-4*cm, "Sample LTO labels") xpos = xorig = 2 * cm ypos = yorig = 2 * cm colwidth = 10 * cm lineheight = 3.9 * cm count = 1234 BaseLTOLabel("RL", count, "3").drawOn(canvas, xpos, ypos) ypos += lineheight count += 1 BaseLTOLabel("RL", count, "3", border=0.0125).drawOn(canvas, xpos, ypos) ypos += lineheight count += 1 VerticalLTOLabel("RL", count, "3").drawOn(canvas, xpos, ypos) ypos += lineheight count += 1 VerticalLTOLabel("RL", count, "3", border=0.0125).drawOn(canvas, xpos, ypos) ypos += lineheight count += 1 VerticalLTOLabel("RL", count, "3", colored=True).drawOn(canvas, xpos, ypos) ypos += lineheight count += 1 VerticalLTOLabel("RL", count, "3", border=0.0125, colored=True).drawOn(canvas, xpos, ypos) canvas.showPage() canvas.save() if __name__ == "__main__" : test()