pyx/document.py

   1 # -*- encoding: utf-8 -*-
   2 #
   3 #
   4 # Copyright (C) 2005-2011 Jörg Lehmann <joergl@users.sourceforge.net>
   5 # Copyright (C) 2005-2011 André Wobst <wobsta@users.sourceforge.net>
   6 #
   7 # This file is part of PyX (http://pyx.sourceforge.net/).
   8 #
   9 # PyX is free software; you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation; either version 2 of the License, or
  12 # (at your option) any later version.
  13 #
  14 # PyX is distributed in the hope that it will be useful,
  15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 # GNU General Public License for more details.
  18 #
  19 # You should have received a copy of the GNU General Public License
  20 # along with PyX; if not, write to the Free Software
  21 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  22
  23 import cStringIO, sys, warnings
  24 import bbox, pswriter, pdfwriter, trafo, style, unit
  25 import canvas as canvasmodule
  26
  27
  28 class paperformat:
  29
  30     def __init__(self, width, height, name=None):
  31         self.width = width
  32         self.height = height
  33         self.name = name
  34
  35 paperformat.A5 = paperformat(148.5 * unit.t_mm, 210  * unit.t_mm, "A5")
  36 paperformat.A4 = paperformat(210 * unit.t_mm, 297  * unit.t_mm, "A4")
  37 paperformat.A3 = paperformat(297 * unit.t_mm, 420  * unit.t_mm, "A3")
  38 paperformat.A2 = paperformat(420 * unit.t_mm, 594  * unit.t_mm, "A2")
  39 paperformat.A1 = paperformat(594 * unit.t_mm, 840  * unit.t_mm, "A1")
  40 paperformat.A0 = paperformat(840 * unit.t_mm, 1188 * unit.t_mm, "A0")
  41 paperformat.A0b = paperformat(910 * unit.t_mm, 1370 * unit.t_mm, None) # dedicated to our friends in Augsburg
  42 paperformat.Letter = paperformat(8.5 * unit.t_inch, 11 * unit.t_inch, "Letter")
  43 paperformat.Legal = paperformat(8.5 * unit.t_inch, 14 * unit.t_inch, "Legal")
  44
  45 def _paperformatfromstring(name):
  46     return getattr(paperformat, name.capitalize())
  47
  48
  49 class page:
  50
  51     def __init__(self, canvas, pagename=None, paperformat=None, rotated=0, centered=1, fittosize=0,
  52                  margin=1*unit.t_cm, bboxenlarge=1*unit.t_pt, bbox=None):
  53         self.canvas = canvas
  54         self.pagename = pagename
  55         # support for deprecated string specification of paper formats
  56         try:
  57             paperformat + ""
  58         except:
  59             self.paperformat = paperformat
  60         else:
  61             self.paperformat = _paperformatfromstring(paperformat)
  62             warnings.warn("specification of paperformat by string is deprecated, use document.paperformat.%s instead" % paperformat.capitalize(), DeprecationWarning)
  63
  64         self.rotated = rotated
  65         self.centered = centered
  66         self.fittosize = fittosize
  67         self.margin = margin
  68         self.bboxenlarge = bboxenlarge
  69         self.pagebbox = bbox
  70
  71     def _process(self, processMethod, contentfile, writer, context, registry, bbox):
  72
  73         # check whether we expect a page trafo and use a temporary canvas to insert the
  74         # page canvas
  75         expectpagetrafo = self.paperformat and (self.rotated or self.centered or self.fittosize)
  76
  77         # usually, it is the bbox of the canvas enlarged by self.bboxenlarge, but
  78         # it might be a different bbox as specified in the page constructor
  79         assert not bbox
  80         if self.pagebbox:
  81             bbox.set(self.pagebbox)
  82         elif bbox:
  83             bbox.enlarge(self.bboxenlarge)
  84         else:
  85             bbox.set(self.canvas.bbox()) # this bbox is not accurate
  86             bbox.enlarge(self.bboxenlarge)
  87
  88         cc = self.canvas
  89         if expectpagetrafo:
  90
  91             # calculate the pagetrafo
  92             paperwidth, paperheight = self.paperformat.width, self.paperformat.height
  93
  94             # center (optionally rotated) output on page
  95             if self.rotated:
  96                 pagetrafo = trafo.rotate(90).translated(paperwidth, 0)
  97                 if self.centered or self.fittosize:
  98                     if not self.fittosize and (bbox.height() > paperwidth or bbox.width() > paperheight):
  99                         warnings.warn("content exceeds the papersize")
 100                     pagetrafo = pagetrafo.translated(-0.5*(paperwidth - bbox.height()) + bbox.bottom(),
 101                                                       0.5*(paperheight - bbox.width()) - bbox.left())
 102             else:
 103                 if not self.fittosize and (bbox.width() > paperwidth or bbox.height() > paperheight):
 104                     warnings.warn("content exceeds the papersize")
 105                 pagetrafo = trafo.translate(0.5*(paperwidth - bbox.width())  - bbox.left(),
 106                                             0.5*(paperheight - bbox.height()) - bbox.bottom())
 107
 108             if self.fittosize:
 109
 110                 if 2*self.margin > paperwidth or 2*self.margin > paperheight:
 111                     raise ValueError("Margins too broad for selected paperformat. Aborting.")
 112
 113                 paperwidth -= 2 * self.margin
 114                 paperheight -= 2 * self.margin
 115
 116                 # scale output to pagesize - margins
 117                 if self.rotated:
 118                     sfactor = min(unit.topt(paperheight)/bbox.width_pt(), unit.topt(paperwidth)/bbox.height_pt())
 119                 else:
 120                     sfactor = min(unit.topt(paperwidth)/bbox.width_pt(), unit.topt(paperheight)/bbox.height_pt())
 121
 122                 pagetrafo = pagetrafo.scaled(sfactor, sfactor, self.margin + 0.5*paperwidth, self.margin + 0.5*paperheight)
 123
 124             bbox.transform(pagetrafo)
 125             cc = canvasmodule.canvas()
 126             cc.insert(self.canvas, [pagetrafo])
 127
 128         getattr(style.linewidth.normal, processMethod)(contentfile, writer, context, registry, bbox)
 129         if self.pagebbox:
 130             bbox = bbox.copy() # don't alter the bbox provided to the constructor -> use a copy
 131         getattr(cc, processMethod)(contentfile, writer, context, registry, bbox)
 132
 133     def processPS(self, *args):
 134         self._process("processPS", *args)
 135
 136     def processPDF(self, *args):
 137         self._process("processPDF", *args)
 138
 139
 140 def _outputstream(file, suffix):
 141     if file is None:
 142         if not sys.argv[0].endswith(".py"):
 143             raise RuntimeError("could not auto-guess filename")
 144         return open("%s.%s" % (sys.argv[0][:-3], suffix), "wb")
 145     try:
 146         file.write("")
 147         return file
 148     except:
 149         if not file.endswith(".%s" % suffix):
 150             return open("%s.%s" % (file, suffix), "wb")
 151         return open(file, "wb")
 152
 153
 154 class document:
 155
 156     """holds a collection of page instances which are output as pages of a document"""
 157
 158     def __init__(self, pages=None):
 159         if pages is None:
 160             self.pages = []
 161         else:
 162             self.pages = pages
 163
 164     def append(self, page):
 165         self.pages.append(page)
 166
 167     def writeEPSfile(self, file=None, **kwargs):
 168         pswriter.EPSwriter(self, _outputstream(file, "eps"), **kwargs)
 169
 170     def writePSfile(self, file=None, **kwargs):
 171         pswriter.PSwriter(self, _outputstream(file, "ps"), **kwargs)
 172
 173     def writePDFfile(self, file=None, **kwargs):
 174         pdfwriter.PDFwriter(self, _outputstream(file, "pdf"), **kwargs)
 175
 176     def writetofile(self, filename, **kwargs):
 177         if filename.endswith(".eps"):
 178             self.writeEPSfile(open(filename, "wb"), **kwargs)
 179         elif filename.endswith(".ps"):
 180             self.writePSfile(open(filename, "wb"), **kwargs)
 181         elif filename.endswith(".pdf"):
 182             self.writePDFfile(open(filename, "wb"), **kwargs)
 183         else:
 184             raise ValueError("unknown file extension")
 185