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, type1font, unit, trafo
  25 from pyx.dvi import mapfile
  26
  27 try:
  28     enumerate([])
  29 except NameError:
  30     # fallback implementation for Python 2.2 and below
  31     def enumerate(list):
  32         return zip(xrange(len(list)), list)
  33
  34 try:
  35     dict([])
  36 except NameError:
  37     # fallback implementation for Python 2.1
  38     def dict(list):
  39         result = {}
  40         for key, value in list:
  41             result[key] = value
  42         return result
  43
  44
  45 class PSregistry:
  46
  47     def __init__(self):
  48         # in order to keep a consistent order of the registered resources we
  49         # not only store them in a hash but also keep an ordered list (up to a
  50         # possible merging of resources, in which case the first instance is
  51         # kept)
  52         self.resourceshash = {}
  53         self.resourceslist = []
  54
  55     def add(self, resource):
  56         rkey = (resource.type, resource.id)
  57         if self.resourceshash.has_key(rkey):
  58            self.resourceshash[rkey].merge(resource)
  59         else:
  60            self.resourceshash[rkey] = resource
  61            self.resourceslist.append(resource)
  62
  63     def mergeregistry(self, registry):
  64         for resource in registry.resources:
  65             self.add(resource)
  66
  67     def output(self, file, writer):
  68         """ write all PostScript code of the prolog resources """
  69         for resource in self.resourceslist:
  70             resource.output(file, writer, self)
  71
  72 #
  73 # Abstract base class
  74 #
  75
  76 class PSresource:
  77
  78     """ a PostScript resource """
  79
  80     def __init__(self, type, id):
  81         # Every PSresource has to have a type and a unique id.
  82         # Resources with the same type and id will be merged
  83         # when they are registered in the PSregistry
  84         self.type = type
  85         self.id = id
  86
  87     def merge(self, other):
  88         """ merge self with other, which has to be a resource of the same type and with
  89         the same id"""
  90         pass
  91
  92     def output(self, file, writer, registry):
  93         raise NotImplementedError("output not implemented for %s" % repr(self))
  94
  95 #
  96 # Different variants of prolog items
  97 #
  98
  99 class PSdefinition(PSresource):
 100
 101     """ PostScript function definition included in the prolog """
 102
 103     def __init__(self, id, body):
 104         self.type = "definition"
 105         self.id = id
 106         self.body = body
 107
 108     def output(self, file, writer, registry):
 109         file.write("%%%%BeginRessource: %s\n" % self.id)
 110         file.write("%(body)s /%(id)s exch def\n" % self.__dict__)
 111         file.write("%%EndRessource\n")
 112
 113
 114 class epswriter:
 115
 116     def __init__(self, document, file, title=None):
 117         self._fontmap = None
 118
 119         if len(document.pages) != 1:
 120             raise ValueError("EPS file can be constructed out of a single page document only")
 121         page = document.pages[0]
 122         canvas = page.canvas
 123
 124         pagefile = cStringIO.StringIO()
 125         registry = PSregistry()
 126         acontext = context()
 127         pagebbox = bbox.empty()
 128
 129         page.processPS(pagefile, self, acontext, registry, pagebbox)
 130
 131         file.write("%!PS-Adobe-3.0 EPSF-3.0\n")
 132         if pagebbox:
 133             file.write("%%%%BoundingBox: %d %d %d %d\n" % pagebbox.lowrestuple_pt())
 134             file.write("%%%%HiResBoundingBox: %g %g %g %g\n" % pagebbox.highrestuple_pt())
 135         file.write("%%%%Creator: PyX %s\n" % version.version)
 136         if title is not None:
 137             file.write("%%%%Title: %s\n" % title)
 138         file.write("%%%%CreationDate: %s\n" %
 139                    time.asctime(time.localtime(time.time())))
 140         file.write("%%EndComments\n")
 141
 142         file.write("%%BeginProlog\n")
 143         registry.output(file, self)
 144         file.write("%%EndProlog\n")
 145
 146         file.write(pagefile.getvalue())
 147         pagefile.close()
 148
 149         file.write("showpage\n")
 150         file.write("%%Trailer\n")
 151         file.write("%%EOF\n")
 152
 153     def getfontmap(self):
 154         if self._fontmap is None:
 155             self._fontmap = mapfile.readfontmap(["psfonts.map"])
 156         return self._fontmap
 157
 158
 159 class pswriter:
 160
 161     def __init__(self, document, file, writebbox=0, title=None):
 162         # We first have to process the content of the pages, writing them into the stream pagesfile
 163         # Doing so, we fill the registry and also calculate the page bounding boxes, which are
 164         # stored in page._bbox for every page
 165         pagesfile = cStringIO.StringIO()
 166         registry = PSregistry()
 167
 168         # calculated bounding boxes of the whole document
 169         documentbbox = bbox.empty()
 170
 171         for nr, page in enumerate(document.pages):
 172             # process contents of page
 173             pagefile = cStringIO.StringIO()
 174             acontext = context()
 175             pagebbox = bbox.empty()
 176             page.processPS(pagefile, self, acontext, registry, pagebbox)
 177
 178             documentbbox += pagebbox
 179
 180             pagesfile.write("%%%%Page: %s %d\n" % (page.pagename is None and str(nr+1) or page.pagename, nr+1))
 181             if page.paperformat:
 182                 pagesfile.write("%%%%PageMedia: %s\n" % page.paperformat.name)
 183             pagesfile.write("%%%%PageOrientation: %s\n" % (page.rotated and "Landscape" or "Portrait"))
 184             if pagebbox and writebbox:
 185                 pagesfile.write("%%%%PageBoundingBox: %d %d %d %d\n" % pagebbox.lowrestuple_pt())
 186
 187             # page setup section
 188             pagesfile.write("%%BeginPageSetup\n")
 189             pagesfile.write("/pgsave save def\n")
 190
 191             pagesfile.write("%%EndPageSetup\n")
 192             pagesfile.write(pagefile.getvalue())
 193             pagefile.close()
 194             pagesfile.write("pgsave restore\n")
 195             pagesfile.write("showpage\n")
 196             pagesfile.write("%%PageTrailer\n")
 197
 198         file.write("%!PS-Adobe-3.0\n")
 199         if documentbbox and writebbox:
 200             file.write("%%%%BoundingBox: %d %d %d %d\n" % documentbbox.lowrestuple_pt())
 201             file.write("%%%%HiResBoundingBox: %g %g %g %g\n" % documentbbox.highrestuple_pt())
 202         file.write("%%%%Creator: PyX %s\n" % version.version)
 203         if title is not None:
 204             file.write("%%%%Title: %s\n" % title)
 205         file.write("%%%%CreationDate: %s\n" %
 206                    time.asctime(time.localtime(time.time())))
 207
 208         # required paper formats
 209         paperformats = {}
 210         for page in document.pages:
 211             if page.paperformat:
 212                 paperformats[page.paperformat] = page.paperformat
 213
 214         first = 1
 215         for paperformat in paperformats.values():
 216             if first:
 217                 file.write("%%DocumentMedia: ")
 218                 first = 0
 219             else:
 220                 file.write("%%+ ")
 221             file.write("%s %d %d 75 white ()\n" % (paperformat.name,
 222                                                    unit.topt(paperformat.width),
 223                                                    unit.topt(paperformat.height)))
 224
 225         # file.write(%%DocumentNeededResources: ") # register not downloaded fonts here
 226
 227         file.write("%%%%Pages: %d\n" % len(document.pages))
 228         file.write("%%PageOrder: Ascend\n")
 229         file.write("%%EndComments\n")
 230
 231         # document defaults section
 232         #file.write("%%BeginDefaults\n")
 233         #file.write("%%EndDefaults\n")
 234
 235         # document prolog section
 236         file.write("%%BeginProlog\n")
 237         registry.output(file, self)
 238         file.write("%%EndProlog\n")
 239
 240         # document setup section
 241         #file.write("%%BeginSetup\n")
 242         #file.write("%%EndSetup\n")
 243
 244         file.write(pagesfile.getvalue())
 245         pagesfile.close()
 246
 247         file.write("%%Trailer\n")
 248         file.write("%%EOF\n")
 249
 250 class context:
 251
 252     def __init__(self):
 253         self.linewidth_pt = None
 254         self.colorspace = None
 255         self.selectedfont = None
 256         # dictionary mapping font names to dictionaries mapping encoding names to encodings
 257         # encodings themselves are mappings from glyphnames to codepoints
 258         self.encodings = {}
 259
 260     def __call__(self, **kwargs):
 261         newcontext = copy.copy(self)
 262         for key, value in kwargs.items():
 263             setattr(newcontext, key, value)
 264         return newcontext