pyx/pattern.py

   1 #!/usr/bin/env python
   2 # -*- coding: ISO-8859-1 -*-
   3 #
   4 #
   5 # Copyright (C) 2002-2006 Jörg Lehmann <joergl@users.sourceforge.net>
   6 # Copyright (C) 2002-2005 André Wobst <wobsta@users.sourceforge.net>
   7 #
   8 # This file is part of PyX (http://pyx.sourceforge.net/).
   9 #
  10 # PyX is free software; you can redistribute it and/or modify
  11 # it under the terms of the GNU General Public License as published by
  12 # the Free Software Foundation; either version 2 of the License, or
  13 # (at your option) any later version.
  14 #
  15 # PyX is distributed in the hope that it will be useful,
  16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 # GNU General Public License for more details.
  19 #
  20 # You should have received a copy of the GNU General Public License
  21 # along with PyX; if not, write to the Free Software
  22 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  23
  24 from __future__ import nested_scopes
  25
  26 import cStringIO, math, warnings
  27 import attr, canvas, path, pdfwriter, pswriter, style, unit, trafo
  28 import bbox as bboxmodule
  29
  30 class _marker: pass
  31
  32 # TODO: pattern should not derive from canvas but wrap a canvas
  33
  34 class pattern(canvas._canvas, attr.exclusiveattr, style.fillstyle):
  35
  36     def __init__(self, painttype=1, tilingtype=1, xstep=None, ystep=None, bbox=None, trafo=None, **kwargs):
  37         canvas._canvas.__init__(self, **kwargs)
  38         attr.exclusiveattr.__init__(self, pattern)
  39         self.id = "pattern%d" % id(self)
  40         self.patterntype = 1
  41         if painttype not in (1,2):
  42             raise ValueError("painttype must be 1 or 2")
  43         self.painttype = painttype
  44         if tilingtype not in (1,2,3):
  45             raise ValueError("tilingtype must be 1, 2 or 3")
  46         self.tilingtype = tilingtype
  47         self.xstep = xstep
  48         self.ystep = ystep
  49         self.patternbbox = bbox
  50         self.patterntrafo = trafo
  51
  52     def __call__(self, painttype=_marker, tilingtype=_marker, xstep=_marker, ystep=_marker,
  53                  bbox=_marker, trafo=_marker):
  54         if painttype is _marker:
  55             painttype = self.painttype
  56         if tilingtype is _marker:
  57             tilingtype = self.tilingtype
  58         if xstep is _marker:
  59             xstep = self.xstep
  60         if ystep is _marker:
  61             ystep = self.ystep
  62         if bbox is _marker:
  63             bbox = self.bbox
  64         if trafo is _marker:
  65             trafo = self.trafo
  66         return pattern(painttype, tilingtype, xstep, ystep, bbox, trafo)
  67
  68     def bbox(self):
  69         return bboxmodule.empty()
  70
  71     def processPS(self, file, writer, context, registry, bbox):
  72         # process pattern, letting it register its resources and calculate the bbox of the pattern
  73         patternfile = cStringIO.StringIO()
  74         realpatternbbox = bboxmodule.empty()
  75         canvas._canvas.processPS(self, patternfile, writer, pswriter.context(), registry, realpatternbbox)
  76         patternproc = patternfile.getvalue()
  77         patternfile.close()
  78
  79         if self.xstep is None:
  80            xstep = unit.topt(realpatternbbox.width())
  81         else:
  82            xstep = unit.topt(self.xstep)
  83         if self.ystep is None:
  84             ystep = unit.topt(realpatternbbox.height())
  85         else:
  86            ystep = unit.topt(self.ystep)
  87         if not xstep:
  88             raise ValueError("xstep in pattern cannot be zero")
  89         if not ystep:
  90             raise ValueError("ystep in pattern cannot be zero")
  91         patternbbox = self.patternbbox or realpatternbbox.enlarged(5*unit.pt)
  92
  93         patternprefix = "\n".join(("<<",
  94                                    "/PatternType %d" % self.patterntype,
  95                                    "/PaintType %d" % self.painttype,
  96                                    "/TilingType %d" % self.tilingtype,
  97                                    "/BBox[%d %d %d %d]" % patternbbox.lowrestuple_pt(),
  98                                    "/XStep %g" % xstep,
  99                                    "/YStep %g" % ystep,
 100                                    "/PaintProc {\nbegin\n"))
 101         patterntrafostring = self.patterntrafo is None and "matrix" or str(self.patterntrafo)
 102         patternsuffix = "end\n} bind\n>>\n%s\nmakepattern" % patterntrafostring
 103
 104         registry.add(pswriter.PSdefinition(self.id, "".join((patternprefix, patternproc, patternsuffix))))
 105
 106         # activate pattern
 107         file.write("%s setpattern\n" % self.id)
 108
 109     def processPDF(self, file, writer, context, registry, bbox):
 110         # we need to keep track of the resources used by the pattern, hence
 111         # we create our own registry, which we merge immediately in the main registry
 112         patternregistry = pdfwriter.PDFregistry()
 113
 114         patternfile = cStringIO.StringIO()
 115         realpatternbbox = bboxmodule.empty()
 116         canvas._canvas.processPDF(self, patternfile, writer, pdfwriter.context(), patternregistry, realpatternbbox)
 117         patternproc = patternfile.getvalue()
 118         patternfile.close()
 119
 120         registry.mergeregistry(patternregistry)
 121
 122         if self.xstep is None:
 123            xstep = unit.topt(realpatternbbox.width())
 124         else:
 125            xstep = unit.topt(self.xstep)
 126         if self.ystep is None:
 127             ystep = unit.topt(realpatternbbox.height())
 128         else:
 129            ystep = unit.topt(self.ystep)
 130         if not xstep:
 131             raise ValueError("xstep in pattern cannot be zero")
 132         if not ystep:
 133             raise ValueError("ystep in pattern cannot be zero")
 134         patternbbox = self.patternbbox or realpatternbbox.enlarged(5*unit.pt)
 135         patterntrafo = self.patterntrafo or trafo.trafo()
 136
 137         registry.add(PDFpattern(self.id, self.patterntype, self.painttype, self.tilingtype,
 138                                 patternbbox, xstep, ystep, patterntrafo, patternproc, writer, registry, patternregistry))
 139
 140         # activate pattern
 141         if context.colorspace != "Pattern":
 142             # we only set the fill color space (see next comment)
 143             file.write("/Pattern cs\n")
 144             context.colorspace = "Pattern"
 145         if context.strokeattr:
 146             # using patterns as stroke colors doesn't seem to work, so
 147             # we just don't do this...
 148             warnings.warn("ignoring stroke color for patterns in PDF")
 149         if context.fillattr:
 150             file.write("/%s scn\n"% self.id)
 151
 152
 153 pattern.clear = attr.clearclass(pattern)
 154
 155
 156 _base = 0.1 * unit.v_cm
 157
 158 class hatched(pattern):
 159     def __init__(self, dist, angle, strokestyles=[]):
 160         pattern.__init__(self, painttype=1, tilingtype=1, xstep=dist, ystep=100*unit.t_pt, bbox=None, trafo=trafo.rotate(angle))
 161         self.strokestyles = attr.mergeattrs([style.linewidth.THIN] + strokestyles)
 162         attr.checkattrs(self.strokestyles, [style.strokestyle])
 163         self.dist = dist
 164         self.angle = angle
 165         self.stroke(path.line_pt(0, -50, 0, 50), self.strokestyles)
 166
 167     def __call__(self, dist=None, angle=None, strokestyles=None):
 168         if dist is None:
 169             dist = self.dist
 170         if angle is None:
 171             angle = self.angle
 172         if strokestyles is None:
 173             strokestyles = self.strokestyles
 174         return hatched(dist, angle, strokestyles)
 175
 176 hatched0 = hatched(_base, 0)
 177 hatched0.SMALL = hatched0(_base/math.sqrt(64))
 178 hatched0.SMALL = hatched0(_base/math.sqrt(64))
 179 hatched0.SMALl = hatched0(_base/math.sqrt(32))
 180 hatched0.SMAll = hatched0(_base/math.sqrt(16))
 181 hatched0.SMall = hatched0(_base/math.sqrt(8))
 182 hatched0.Small = hatched0(_base/math.sqrt(4))
 183 hatched0.small = hatched0(_base/math.sqrt(2))
 184 hatched0.normal = hatched0(_base)
 185 hatched0.large = hatched0(_base*math.sqrt(2))
 186 hatched0.Large = hatched0(_base*math.sqrt(4))
 187 hatched0.LArge = hatched0(_base*math.sqrt(8))
 188 hatched0.LARge = hatched0(_base*math.sqrt(16))
 189 hatched0.LARGe = hatched0(_base*math.sqrt(32))
 190 hatched0.LARGE = hatched0(_base*math.sqrt(64))
 191
 192 hatched45 = hatched(_base, 45)
 193 hatched45.SMALL = hatched45(_base/math.sqrt(64))
 194 hatched45.SMALl = hatched45(_base/math.sqrt(32))
 195 hatched45.SMAll = hatched45(_base/math.sqrt(16))
 196 hatched45.SMall = hatched45(_base/math.sqrt(8))
 197 hatched45.Small = hatched45(_base/math.sqrt(4))
 198 hatched45.small = hatched45(_base/math.sqrt(2))
 199 hatched45.normal = hatched45(_base)
 200 hatched45.large = hatched45(_base*math.sqrt(2))
 201 hatched45.Large = hatched45(_base*math.sqrt(4))
 202 hatched45.LArge = hatched45(_base*math.sqrt(8))
 203 hatched45.LARge = hatched45(_base*math.sqrt(16))
 204 hatched45.LARGe = hatched45(_base*math.sqrt(32))
 205 hatched45.LARGE = hatched45(_base*math.sqrt(64))
 206
 207 hatched90 = hatched(_base, 90)
 208 hatched90.SMALL = hatched90(_base/math.sqrt(64))
 209 hatched90.SMALl = hatched90(_base/math.sqrt(32))
 210 hatched90.SMAll = hatched90(_base/math.sqrt(16))
 211 hatched90.SMall = hatched90(_base/math.sqrt(8))
 212 hatched90.Small = hatched90(_base/math.sqrt(4))
 213 hatched90.small = hatched90(_base/math.sqrt(2))
 214 hatched90.normal = hatched90(_base)
 215 hatched90.large = hatched90(_base*math.sqrt(2))
 216 hatched90.Large = hatched90(_base*math.sqrt(4))
 217 hatched90.LArge = hatched90(_base*math.sqrt(8))
 218 hatched90.LARge = hatched90(_base*math.sqrt(16))
 219 hatched90.LARGe = hatched90(_base*math.sqrt(32))
 220 hatched90.LARGE = hatched90(_base*math.sqrt(64))
 221
 222 hatched135 = hatched(_base, 135)
 223 hatched135.SMALL = hatched135(_base/math.sqrt(64))
 224 hatched135.SMALl = hatched135(_base/math.sqrt(32))
 225 hatched135.SMAll = hatched135(_base/math.sqrt(16))
 226 hatched135.SMall = hatched135(_base/math.sqrt(8))
 227 hatched135.Small = hatched135(_base/math.sqrt(4))
 228 hatched135.small = hatched135(_base/math.sqrt(2))
 229 hatched135.normal = hatched135(_base)
 230 hatched135.large = hatched135(_base*math.sqrt(2))
 231 hatched135.Large = hatched135(_base*math.sqrt(4))
 232 hatched135.LArge = hatched135(_base*math.sqrt(8))
 233 hatched135.LARge = hatched135(_base*math.sqrt(16))
 234 hatched135.LARGe = hatched135(_base*math.sqrt(32))
 235 hatched135.LARGE = hatched135(_base*math.sqrt(64))
 236
 237
 238 class crosshatched(pattern):
 239     def __init__(self, dist, angle, strokestyles=[]):
 240         pattern.__init__(self, painttype=1, tilingtype=1, xstep=dist, ystep=dist, bbox=None, trafo=trafo.rotate(angle))
 241         self.strokestyles = attr.mergeattrs([style.linewidth.THIN] + strokestyles)
 242         attr.checkattrs(self.strokestyles, [style.strokestyle])
 243         self.dist = dist
 244         self.angle = angle
 245         self.stroke(path.line_pt(0, 0, 0, unit.topt(dist)), self.strokestyles)
 246         self.stroke(path.line_pt(0, 0, unit.topt(dist), 0), self.strokestyles)
 247
 248     def __call__(self, dist=None, angle=None, strokestyles=None):
 249         if dist is None:
 250             dist = self.dist
 251         if angle is None:
 252             angle = self.angle
 253         if strokestyles is None:
 254             strokestyles = self.strokestyles
 255         return crosshatched(dist, angle, strokestyles)
 256
 257 crosshatched0 = crosshatched(_base, 0)
 258 crosshatched0.SMALL = crosshatched0(_base/math.sqrt(64))
 259 crosshatched0.SMALl = crosshatched0(_base/math.sqrt(32))
 260 crosshatched0.SMAll = crosshatched0(_base/math.sqrt(16))
 261 crosshatched0.SMall = crosshatched0(_base/math.sqrt(8))
 262 crosshatched0.Small = crosshatched0(_base/math.sqrt(4))
 263 crosshatched0.small = crosshatched0(_base/math.sqrt(2))
 264 crosshatched0.normal = crosshatched0
 265 crosshatched0.large = crosshatched0(_base*math.sqrt(2))
 266 crosshatched0.Large = crosshatched0(_base*math.sqrt(4))
 267 crosshatched0.LArge = crosshatched0(_base*math.sqrt(8))
 268 crosshatched0.LARge = crosshatched0(_base*math.sqrt(16))
 269 crosshatched0.LARGe = crosshatched0(_base*math.sqrt(32))
 270 crosshatched0.LARGE = crosshatched0(_base*math.sqrt(64))
 271
 272 crosshatched45 = crosshatched(_base, 45)
 273 crosshatched45.SMALL = crosshatched45(_base/math.sqrt(64))
 274 crosshatched45.SMALl = crosshatched45(_base/math.sqrt(32))
 275 crosshatched45.SMAll = crosshatched45(_base/math.sqrt(16))
 276 crosshatched45.SMall = crosshatched45(_base/math.sqrt(8))
 277 crosshatched45.Small = crosshatched45(_base/math.sqrt(4))
 278 crosshatched45.small = crosshatched45(_base/math.sqrt(2))
 279 crosshatched45.normal = crosshatched45
 280 crosshatched45.large = crosshatched45(_base*math.sqrt(2))
 281 crosshatched45.Large = crosshatched45(_base*math.sqrt(4))
 282 crosshatched45.LArge = crosshatched45(_base*math.sqrt(8))
 283 crosshatched45.LARge = crosshatched45(_base*math.sqrt(16))
 284 crosshatched45.LARGe = crosshatched45(_base*math.sqrt(32))
 285 crosshatched45.LARGE = crosshatched45(_base*math.sqrt(64))
 286
 287
 288 class PDFpattern(pdfwriter.PDFobject):
 289
 290     def __init__(self, name, patterntype, painttype, tilingtype, bbox, xstep, ystep, trafo,
 291                  patternproc, writer, registry, patternregistry):
 292         self.patternregistry = patternregistry
 293         pdfwriter.PDFobject.__init__(self, "pattern", name)
 294         registry.addresource("Pattern", name, self)
 295
 296         self.name = name
 297         self.patterntype = patterntype
 298         self.painttype = painttype
 299         self.tilingtype = tilingtype
 300         self.bbox = bbox
 301         self.xstep = xstep
 302         self.ystep = ystep
 303         self.trafo = trafo
 304         self.patternproc = patternproc
 305
 306     def write(self, file, writer, registry):
 307         file.write("<<\n"
 308                    "/Type /Pattern\n"
 309                    "/PatternType %d\n" % self.patterntype)
 310         file.write("/PaintType %d\n" % self.painttype)
 311         file.write("/TilingType %d\n" % self.tilingtype)
 312         file.write("/BBox [%d %d %d %d]\n" % self.bbox.lowrestuple_pt())
 313         file.write("/XStep %f\n" % self.xstep)
 314         file.write("/YStep %f\n" % self.ystep)
 315         file.write("/Matrix %s\n" % str(self.trafo))
 316         self.patternregistry.writeresources(file)
 317         if writer.compress:
 318             import zlib
 319             content = zlib.compress(self.patternproc)
 320         else:
 321             content = self.patterproc
 322
 323         file.write("/Length %i\n" % len(content))
 324         if writer.compress:
 325             file.write("/Filter /FlateDecode\n")
 326         file.write(">>\n"
 327                    "stream\n")
 328         file.write(content)
 329         file.write("endstream\n")