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Added printing requirements
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Tom Price
196
reportlab/graphics/barcode/lto.py
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196
reportlab/graphics/barcode/lto.py
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# (c) 2008 Jerome Alet - <alet@librelogiciel.com>
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# Licensing terms : ReportLab's license.
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from reportlab.graphics.barcode.code39 import Standard39
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from reportlab.lib import colors
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from reportlab.lib.units import cm
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from string import digits as string_digits
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from reportlab.lib.utils import ascii_uppercase
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class BaseLTOLabel(Standard39) :
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"""
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Base class for LTO labels.
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Specification taken from "IBM LTO Ultrium Cartridge Label Specification, Revision 3"
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available on May 14th 2008 from :
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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
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"""
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LABELWIDTH = 7.9 * cm
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LABELHEIGHT = 1.7 * cm
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LABELROUND = 0.15 * cm
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CODERATIO = 2.75
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CODENOMINALWIDTH = 7.4088 * cm
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CODEBARHEIGHT = 1.11 * cm
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CODEBARWIDTH = 0.0432 * cm
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CODEGAP = CODEBARWIDTH
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CODELQUIET = 10 * CODEBARWIDTH
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CODERQUIET = 10 * CODEBARWIDTH
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def __init__(self, prefix="",
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number=None,
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subtype="1",
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border=None,
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checksum=False,
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availheight=None) :
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"""
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Initializes an LTO label.
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prefix : Up to six characters from [A-Z][0-9]. Defaults to "".
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number : Label's number or None. Defaults to None.
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subtype : LTO subtype string , e.g. "1" for LTO1. Defaults to "1".
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border : None, or the width of the label's border. Defaults to None.
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checksum : Boolean indicates if checksum char has to be printed. Defaults to False.
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availheight : Available height on the label, or None for automatic. Defaults to None.
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"""
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self.height = max(availheight, self.CODEBARHEIGHT)
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self.border = border
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if (len(subtype) != 1) \
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or (subtype not in ascii_uppercase + string_digits) :
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raise ValueError("Invalid subtype '%s'" % subtype)
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if ((not number) and (len(prefix) > 6)) \
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or not prefix.isalnum() :
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raise ValueError("Invalid prefix '%s'" % prefix)
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label = "%sL%s" % ((prefix + str(number or 0).zfill(6 - len(prefix)))[:6],
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subtype)
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if len(label) != 8 :
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raise ValueError("Invalid set of parameters (%s, %s, %s)" \
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% (prefix, number, subtype))
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self.label = label
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Standard39.__init__(self,
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label,
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ratio=self.CODERATIO,
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barHeight=self.height,
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barWidth=self.CODEBARWIDTH,
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gap=self.CODEGAP,
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lquiet=self.CODELQUIET,
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rquiet=self.CODERQUIET,
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quiet=True,
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checksum=checksum)
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def drawOn(self, canvas, x, y) :
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"""Draws the LTO label onto the canvas."""
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canvas.saveState()
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canvas.translate(x, y)
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if self.border :
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canvas.setLineWidth(self.border)
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canvas.roundRect(0, 0,
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self.LABELWIDTH,
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self.LABELHEIGHT,
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self.LABELROUND)
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Standard39.drawOn(self,
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canvas,
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(self.LABELWIDTH-self.CODENOMINALWIDTH)/2.0,
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self.LABELHEIGHT-self.height)
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canvas.restoreState()
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class VerticalLTOLabel(BaseLTOLabel) :
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"""
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A class for LTO labels with rectangular blocks around the tape identifier.
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"""
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LABELFONT = ("Helvetica-Bold", 14)
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BLOCKWIDTH = 1*cm
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BLOCKHEIGHT = 0.45*cm
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LINEWIDTH = 0.0125
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NBBLOCKS = 7
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COLORSCHEME = ("red",
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"yellow",
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"lightgreen",
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"lightblue",
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"grey",
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"orangered",
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"pink",
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"darkgreen",
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"orange",
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"purple")
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def __init__(self, *args, **kwargs) :
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"""
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Initializes the label.
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colored : boolean to determine if blocks have to be colorized.
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"""
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if "colored" in kwargs:
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self.colored = kwargs["colored"]
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del kwargs["colored"]
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else :
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self.colored = False
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kwargs["availheight"] = self.LABELHEIGHT-self.BLOCKHEIGHT
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BaseLTOLabel.__init__(self, *args, **kwargs)
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def drawOn(self, canvas, x, y) :
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"""Draws some blocks around the identifier's characters."""
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BaseLTOLabel.drawOn(self,
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canvas,
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x,
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y)
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canvas.saveState()
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canvas.setLineWidth(self.LINEWIDTH)
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canvas.setStrokeColorRGB(0, 0, 0)
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canvas.translate(x, y)
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xblocks = (self.LABELWIDTH-(self.NBBLOCKS*self.BLOCKWIDTH))/2.0
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for i in range(self.NBBLOCKS) :
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(font, size) = self.LABELFONT
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newfont = self.LABELFONT
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if i == (self.NBBLOCKS - 1) :
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part = self.label[i:]
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(font, size) = newfont
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size /= 2.0
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newfont = (font, size)
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else :
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part = self.label[i]
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canvas.saveState()
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canvas.translate(xblocks+(i*self.BLOCKWIDTH), 0)
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if self.colored and part.isdigit() :
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canvas.setFillColorRGB(*getattr(colors,
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self.COLORSCHEME[int(part)],
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colors.Color(1, 1, 1)).rgb())
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else:
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canvas.setFillColorRGB(1, 1, 1)
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canvas.rect(0, 0, self.BLOCKWIDTH, self.BLOCKHEIGHT, fill=True)
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canvas.translate((self.BLOCKWIDTH+canvas.stringWidth(part, *newfont))/2.0,
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(self.BLOCKHEIGHT/2.0))
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canvas.rotate(90.0)
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canvas.setFont(*newfont)
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canvas.setFillColorRGB(0, 0, 0)
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canvas.drawCentredString(0, 0, part)
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canvas.restoreState()
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canvas.restoreState()
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def test() :
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"""Test this."""
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from reportlab.pdfgen.canvas import Canvas
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from reportlab.lib import pagesizes
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canvas = Canvas("labels.pdf", pagesize=pagesizes.A4)
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canvas.setFont("Helvetica", 30)
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(width, height) = pagesizes.A4
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canvas.drawCentredString(width/2.0, height-4*cm, "Sample LTO labels")
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xpos = xorig = 2 * cm
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ypos = yorig = 2 * cm
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colwidth = 10 * cm
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lineheight = 3.9 * cm
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count = 1234
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BaseLTOLabel("RL", count, "3").drawOn(canvas, xpos, ypos)
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ypos += lineheight
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count += 1
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BaseLTOLabel("RL", count, "3",
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border=0.0125).drawOn(canvas, xpos, ypos)
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ypos += lineheight
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count += 1
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VerticalLTOLabel("RL", count, "3").drawOn(canvas, xpos, ypos)
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ypos += lineheight
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count += 1
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VerticalLTOLabel("RL", count, "3",
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border=0.0125).drawOn(canvas, xpos, ypos)
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ypos += lineheight
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count += 1
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VerticalLTOLabel("RL", count, "3",
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colored=True).drawOn(canvas, xpos, ypos)
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ypos += lineheight
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count += 1
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VerticalLTOLabel("RL", count, "3",
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border=0.0125, colored=True).drawOn(canvas, xpos, ypos)
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canvas.showPage()
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canvas.save()
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if __name__ == "__main__" :
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test()
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