pyx/pswriter.py

   1 # -*- coding: ISO-8859-1 -*-
   2 #
   3 #
   4 # Copyright (C) 2005-2006 Jörg Lehmann <joergl@users.sourceforge.net>
   5 # Copyright (C) 2005-2006 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, copy, time, math
  24 import bbox, style, version, unit, trafo
  25
  26 try:
  27     enumerate([])
  28 except NameError:
  29     # fallback implementation for Python 2.2 and below
  30     def enumerate(list):
  31         return zip(xrange(len(list)), list)
  32
  33 try:
  34     dict([])
  35 except NameError:
  36     # fallback implementation for Python 2.1
  37     def dict(list):
  38         result = {}
  39         for key, value in list:
  40             result[key] = value
  41         return result
  42
  43
  44 class PSregistry:
  45
  46     def __init__(self):
  47         # in order to keep a consistent order of the registered resources we
  48         # not only store them in a hash but also keep an ordered list (up to a
  49         # possible merging of resources, in which case the first instance is
  50         # kept)
  51         self.resourceshash = {}
  52         self.resourceslist = []
  53
  54     def add(self, resource):
  55         rkey = (resource.type, resource.id)
  56         if self.resourceshash.has_key(rkey):
  57            self.resourceshash[rkey].merge(resource)
  58         else:
  59            self.resourceshash[rkey] = resource
  60            self.resourceslist.append(resource)
  61
  62     def mergeregistry(self, registry):
  63         for resource in registry.resources:
  64             self.add(resource)
  65
  66     def output(self, file, writer):
  67         """ write all PostScript code of the prolog resources """
  68         for resource in self.resourceslist:
  69             resource.output(file, writer, self)
  70
  71 #
  72 # Abstract base class
  73 #
  74
  75 class PSresource:
  76
  77     """ a PostScript resource """
  78
  79     def __init__(self, type, id):
  80         # Every PSresource has to have a type and a unique id.
  81         # Resources with the same type and id will be merged
  82         # when they are registered in the PSregistry
  83         self.type = type
  84         self.id = id
  85
  86     def merge(self, other):
  87         """ merge self with other, which has to be a resource of the same type and with
  88         the same id"""
  89         pass
  90
  91     def output(self, file, writer, registry):
  92         raise NotImplementedError("output not implemented for %s" % repr(self))
  93
  94 #
  95 # Different variants of prolog items
  96 #
  97
  98 class PSdefinition(PSresource):
  99
 100     """ PostScript function definition included in the prolog """
 101
 102     def __init__(self, id, body):
 103         self.type = "definition"
 104         self.id = id
 105         self.body = body
 106
 107     def output(self, file, writer, registry):
 108         file.write("%%%%BeginRessource: %s\n" % self.id)
 109         file.write("%(body)s /%(id)s exch def\n" % self.__dict__)
 110         file.write("%%EndRessource\n")
 111
 112
 113 class epswriter:
 114
 115     def __init__(self, document, file, title=None):
 116         self._fontmap = None
 117
 118         if len(document.pages) != 1:
 119             raise ValueError("EPS file can be constructed out of a single page document only")
 120         page = document.pages[0]
 121         canvas = page.canvas
 122
 123         pagefile = cStringIO.StringIO()
 124         registry = PSregistry()
 125         acontext = context()
 126         pagebbox = bbox.empty()
 127
 128         page.processPS(pagefile, self, acontext, registry, pagebbox)
 129
 130         file.write("%!PS-Adobe-3.0 EPSF-3.0\n")
 131         if pagebbox:
 132             file.write("%%%%BoundingBox: %d %d %d %d\n" % pagebbox.lowrestuple_pt())
 133             file.write("%%%%HiResBoundingBox: %g %g %g %g\n" % pagebbox.highrestuple_pt())
 134         file.write("%%%%Creator: PyX %s\n" % version.version)
 135         if title is not None:
 136             file.write("%%%%Title: %s\n" % title)
 137         file.write("%%%%CreationDate: %s\n" %
 138                    time.asctime(time.localtime(time.time())))
 139         file.write("%%EndComments\n")
 140
 141         file.write("%%BeginProlog\n")
 142         registry.output(file, self)
 143         file.write("%%EndProlog\n")
 144
 145         file.write(pagefile.getvalue())
 146         pagefile.close()
 147
 148         file.write("showpage\n")
 149         file.write("%%Trailer\n")
 150         file.write("%%EOF\n")
 151
 152     def getfontmap(self):
 153         if self._fontmap is None:
 154             # late import due to cyclic dependency
 155             from pyx.dvi import mapfile
 156             self._fontmap = mapfile.readfontmap(["psfonts.map"])
 157             # config.get("text", "fontmaps", "psfonts.map")
 158             # self.fontmap = dvifile.readfontmap(self.fontmaps.split())
 159         return self._fontmap
 160
 161
 162 class pswriter:
 163
 164     def __init__(self, document, file, writebbox=0, title=None):
 165         # We first have to process the content of the pages, writing them into the stream pagesfile
 166         # Doing so, we fill the registry and also calculate the page bounding boxes, which are
 167         # stored in page._bbox for every page
 168         pagesfile = cStringIO.StringIO()
 169         registry = PSregistry()
 170
 171         # calculated bounding boxes of the whole document
 172         documentbbox = bbox.empty()
 173
 174         for nr, page in enumerate(document.pages):
 175             # process contents of page
 176             pagefile = cStringIO.StringIO()
 177             acontext = context()
 178             pagebbox = bbox.empty()
 179             page.processPS(pagefile, self, acontext, registry, pagebbox)
 180
 181             documentbbox += pagebbox
 182
 183             pagesfile.write("%%%%Page: %s %d\n" % (page.pagename is None and str(nr+1) or page.pagename, nr+1))
 184             if page.paperformat:
 185                 pagesfile.write("%%%%PageMedia: %s\n" % page.paperformat.name)
 186             pagesfile.write("%%%%PageOrientation: %s\n" % (page.rotated and "Landscape" or "Portrait"))
 187             if pagebbox and writebbox:
 188                 pagesfile.write("%%%%PageBoundingBox: %d %d %d %d\n" % pagebbox.lowrestuple_pt())
 189
 190             # page setup section
 191             pagesfile.write("%%BeginPageSetup\n")
 192             pagesfile.write("/pgsave save def\n")
 193
 194             pagesfile.write("%%EndPageSetup\n")
 195             pagesfile.write(pagefile.getvalue())
 196             pagefile.close()
 197             pagesfile.write("pgsave restore\n")
 198             pagesfile.write("showpage\n")
 199             pagesfile.write("%%PageTrailer\n")
 200
 201         file.write("%!PS-Adobe-3.0\n")
 202         if documentbbox and writebbox:
 203             file.write("%%%%BoundingBox: %d %d %d %d\n" % documentbbox.lowrestuple_pt())
 204             file.write("%%%%HiResBoundingBox: %g %g %g %g\n" % documentbbox.highrestuple_pt())
 205         file.write("%%%%Creator: PyX %s\n" % version.version)
 206         if title is not None:
 207             file.write("%%%%Title: %s\n" % title)
 208         file.write("%%%%CreationDate: %s\n" %
 209                    time.asctime(time.localtime(time.time())))
 210
 211         # required paper formats
 212         paperformats = {}
 213         for page in document.pages:
 214             if page.paperformat:
 215                 paperformats[page.paperformat] = page.paperformat
 216
 217         first = 1
 218         for paperformat in paperformats.values():
 219             if first:
 220                 file.write("%%DocumentMedia: ")
 221                 first = 0
 222             else:
 223                 file.write("%%+ ")
 224             file.write("%s %d %d 75 white ()\n" % (paperformat.name,
 225                                                    unit.topt(paperformat.width),
 226                                                    unit.topt(paperformat.height)))
 227
 228         # file.write(%%DocumentNeededResources: ") # register not downloaded fonts here
 229
 230         file.write("%%%%Pages: %d\n" % len(document.pages))
 231         file.write("%%PageOrder: Ascend\n")
 232         file.write("%%EndComments\n")
 233
 234         # document defaults section
 235         #file.write("%%BeginDefaults\n")
 236         #file.write("%%EndDefaults\n")
 237
 238         # document prolog section
 239         file.write("%%BeginProlog\n")
 240         registry.output(file, self)
 241         file.write("%%EndProlog\n")
 242
 243         # document setup section
 244         #file.write("%%BeginSetup\n")
 245         #file.write("%%EndSetup\n")
 246
 247         file.write(pagesfile.getvalue())
 248         pagesfile.close()
 249
 250         file.write("%%Trailer\n")
 251         file.write("%%EOF\n")
 252
 253 class context:
 254
 255     def __init__(self):
 256         self.linewidth_pt = None
 257         self.colorspace = None
 258         self.selectedfont = None
 259         # dictionary mapping font names to dictionaries mapping encoding names to encodings
 260         # encodings themselves are mappings from glyphnames to codepoints
 261         self.encodings = {}
 262
 263     def __call__(self, **kwargs):
 264         newcontext = copy.copy(self)
 265         for key, value in kwargs.items():
 266             setattr(newcontext, key, value)
 267         return newcontext