pattern.py

   1 # -*- encoding: utf-8 -*-
   2 #
   3 #
   4 # Copyright (C) 2002-2011 Jörg Lehmann <joergl@users.sourceforge.net>
   5 # Copyright (C) 2002-2011 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 io, math, warnings
  24 from . import attr, canvas, path, pdfwriter, pswriter, style, unit, trafo
  25 from . import writer as writermodule
  26 from . import bbox as bboxmodule
  27
  28 class _marker: pass
  29
  30 # TODO: pattern should not derive from canvas but wrap a canvas
  31
  32 class pattern(canvas.canvas, attr.exclusiveattr, style.fillstyle):
  33
  34     def __init__(self, painttype=1, tilingtype=1, xstep=None, ystep=None,
  35                  bbox=None, trafo=None, bboxenlarge=5*unit.t_pt, **kwargs):
  36         canvas.canvas.__init__(self, **kwargs)
  37         attr.exclusiveattr.__init__(self, pattern)
  38         self.id = "pattern%d" % id(self)
  39         self.patterntype = 1
  40         if painttype not in (1, 2):
  41             raise ValueError("painttype must be 1 or 2")
  42         self.painttype = painttype
  43         if tilingtype not in (1, 2, 3):
  44             raise ValueError("tilingtype must be 1, 2, or 3")
  45         self.tilingtype = tilingtype
  46         self.xstep = xstep
  47         self.ystep = ystep
  48         self.patternbbox = bbox
  49         self.patterntrafo = trafo
  50         self.bboxenlarge = bboxenlarge
  51
  52     def __call__(self, painttype=_marker, tilingtype=_marker, xstep=_marker, ystep=_marker,
  53                  bbox=_marker, trafo=_marker, bboxenlarge=_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         if bboxenlarge is _marker:
  67             bboxenlarge = self.bboxenlarge
  68         return pattern(painttype, tilingtype, xstep, ystep, bbox, trafo, bboxenlarge)
  69
  70     def processPS(self, file, writer, context, registry):
  71         # process pattern, letting it register its resources and calculate the bbox of the pattern
  72         patternfile = writermodule.writer(io.BytesIO())
  73         realpatternbbox = bboxmodule.empty()
  74         canvas.canvas.processPS(self, patternfile, writer, pswriter.context(), registry, realpatternbbox)
  75         patternproc = patternfile.file.getvalue()
  76         patternfile.close()
  77
  78         if self.xstep is None:
  79             xstep = unit.topt(realpatternbbox.width())
  80         else:
  81             xstep = unit.topt(self.xstep)
  82         if self.ystep is None:
  83             ystep = unit.topt(realpatternbbox.height())
  84         else:
  85             ystep = unit.topt(self.ystep)
  86         if not xstep:
  87             raise ValueError("xstep in pattern cannot be zero")
  88         if not ystep:
  89             raise ValueError("ystep in pattern cannot be zero")
  90         patternbbox = self.patternbbox or realpatternbbox.enlarged(self.bboxenlarge)
  91
  92         patternprefix = "\n".join(("<<",
  93                                    "/PatternType %d" % self.patterntype,
  94                                    "/PaintType %d" % self.painttype,
  95                                    "/TilingType %d" % self.tilingtype,
  96                                    "/BBox [%g %g %g %g]" % patternbbox.highrestuple_pt(),
  97                                    "/XStep %g" % xstep,
  98                                    "/YStep %g" % ystep,
  99                                    "/PaintProc {\nbegin\n"))
 100         patterntrafostring = self.patterntrafo is None and "matrix" or str(self.patterntrafo)
 101         patternsuffix = "end\n} bind\n>>\n%s\nmakepattern" % patterntrafostring
 102
 103         registry.add(pswriter.PSdefinition(self.id, patternprefix.encode("ascii") + patternproc + patternsuffix.encode("ascii")))
 104
 105         # activate pattern
 106         file.write("%s setpattern\n" % self.id)
 107
 108     def processPDF(self, file, writer, context, registry):
 109         # we need to keep track of the resources used by the pattern, hence
 110         # we create our own registry, which we merge immediately in the main registry
 111         patternregistry = pdfwriter.PDFregistry()
 112
 113         patternfile = writermodule.writer(io.BytesIO())
 114         realpatternbbox = bboxmodule.empty()
 115         canvas.canvas.processPDF(self, patternfile, writer, pdfwriter.context(), patternregistry, realpatternbbox)
 116         patternproc = patternfile.file.getvalue()
 117         patternfile.close()
 118
 119         registry.mergeregistry(patternregistry)
 120
 121         if self.xstep is None:
 122            xstep = unit.topt(realpatternbbox.width())
 123         else:
 124            xstep = unit.topt(self.xstep)
 125         if self.ystep is None:
 126             ystep = unit.topt(realpatternbbox.height())
 127         else:
 128            ystep = unit.topt(self.ystep)
 129         if not xstep:
 130             raise ValueError("xstep in pattern cannot be zero")
 131         if not ystep:
 132             raise ValueError("ystep in pattern cannot be zero")
 133         patternbbox = self.patternbbox or realpatternbbox.enlarged(5*unit.pt)
 134         patterntrafo = self.patterntrafo or trafo.trafo()
 135
 136         registry.add(PDFpattern(self.id, self.patterntype, self.painttype, self.tilingtype,
 137                                 patternbbox, xstep, ystep, patterntrafo, patternproc, writer, registry, patternregistry))
 138
 139         # activate pattern
 140         if context.colorspace != "Pattern":
 141             # we only set the fill color space (see next comment)
 142             file.write("/Pattern cs\n")
 143             context.colorspace = "Pattern"
 144         if context.strokeattr:
 145             # using patterns as stroke colors doesn't seem to work, so
 146             # we just don't do this...
 147             warnings.warn("ignoring stroke color for patterns in PDF")
 148         if context.fillattr:
 149             file.write("/%s scn\n"% self.id)
 150
 151
 152 pattern.clear = attr.clearclass(pattern)
 153
 154
 155 _base = 0.1 * unit.v_cm
 156
 157 class hatched(pattern):
 158     def __init__(self, dist, angle, strokestyles=[]):
 159         pattern.__init__(self, painttype=1, tilingtype=1, xstep=dist, ystep=100*unit.t_pt, bbox=None, trafo=trafo.rotate(angle))
 160         self.strokestyles = attr.mergeattrs([style.linewidth.THIN] + strokestyles)
 161         attr.checkattrs(self.strokestyles, [style.strokestyle])
 162         self.dist = dist
 163         self.angle = angle
 164         self.stroke(path.line_pt(0, -50, 0, 50), self.strokestyles)
 165
 166     def __call__(self, dist=None, angle=None, strokestyles=None):
 167         if dist is None:
 168             dist = self.dist
 169         if angle is None:
 170             angle = self.angle
 171         if strokestyles is None:
 172             strokestyles = self.strokestyles
 173         return hatched(dist, angle, strokestyles)
 174
 175 hatched0 = hatched(_base, 0)
 176 hatched0.SMALL = hatched0(_base/math.sqrt(64))
 177 hatched0.SMALL = hatched0(_base/math.sqrt(64))
 178 hatched0.SMALl = hatched0(_base/math.sqrt(32))
 179 hatched0.SMAll = hatched0(_base/math.sqrt(16))
 180 hatched0.SMall = hatched0(_base/math.sqrt(8))
 181 hatched0.Small = hatched0(_base/math.sqrt(4))
 182 hatched0.small = hatched0(_base/math.sqrt(2))
 183 hatched0.normal = hatched0(_base)
 184 hatched0.large = hatched0(_base*math.sqrt(2))
 185 hatched0.Large = hatched0(_base*math.sqrt(4))
 186 hatched0.LArge = hatched0(_base*math.sqrt(8))
 187 hatched0.LARge = hatched0(_base*math.sqrt(16))
 188 hatched0.LARGe = hatched0(_base*math.sqrt(32))
 189 hatched0.LARGE = hatched0(_base*math.sqrt(64))
 190
 191 hatched45 = hatched(_base, 45)
 192 hatched45.SMALL = hatched45(_base/math.sqrt(64))
 193 hatched45.SMALl = hatched45(_base/math.sqrt(32))
 194 hatched45.SMAll = hatched45(_base/math.sqrt(16))
 195 hatched45.SMall = hatched45(_base/math.sqrt(8))
 196 hatched45.Small = hatched45(_base/math.sqrt(4))
 197 hatched45.small = hatched45(_base/math.sqrt(2))
 198 hatched45.normal = hatched45(_base)
 199 hatched45.large = hatched45(_base*math.sqrt(2))
 200 hatched45.Large = hatched45(_base*math.sqrt(4))
 201 hatched45.LArge = hatched45(_base*math.sqrt(8))
 202 hatched45.LARge = hatched45(_base*math.sqrt(16))
 203 hatched45.LARGe = hatched45(_base*math.sqrt(32))
 204 hatched45.LARGE = hatched45(_base*math.sqrt(64))
 205
 206 hatched90 = hatched(_base, 90)
 207 hatched90.SMALL = hatched90(_base/math.sqrt(64))
 208 hatched90.SMALl = hatched90(_base/math.sqrt(32))
 209 hatched90.SMAll = hatched90(_base/math.sqrt(16))
 210 hatched90.SMall = hatched90(_base/math.sqrt(8))
 211 hatched90.Small = hatched90(_base/math.sqrt(4))
 212 hatched90.small = hatched90(_base/math.sqrt(2))
 213 hatched90.normal = hatched90(_base)
 214 hatched90.large = hatched90(_base*math.sqrt(2))
 215 hatched90.Large = hatched90(_base*math.sqrt(4))
 216 hatched90.LArge = hatched90(_base*math.sqrt(8))
 217 hatched90.LARge = hatched90(_base*math.sqrt(16))
 218 hatched90.LARGe = hatched90(_base*math.sqrt(32))
 219 hatched90.LARGE = hatched90(_base*math.sqrt(64))
 220
 221 hatched135 = hatched(_base, 135)
 222 hatched135.SMALL = hatched135(_base/math.sqrt(64))
 223 hatched135.SMALl = hatched135(_base/math.sqrt(32))
 224 hatched135.SMAll = hatched135(_base/math.sqrt(16))
 225 hatched135.SMall = hatched135(_base/math.sqrt(8))
 226 hatched135.Small = hatched135(_base/math.sqrt(4))
 227 hatched135.small = hatched135(_base/math.sqrt(2))
 228 hatched135.normal = hatched135(_base)
 229 hatched135.large = hatched135(_base*math.sqrt(2))
 230 hatched135.Large = hatched135(_base*math.sqrt(4))
 231 hatched135.LArge = hatched135(_base*math.sqrt(8))
 232 hatched135.LARge = hatched135(_base*math.sqrt(16))
 233 hatched135.LARGe = hatched135(_base*math.sqrt(32))
 234 hatched135.LARGE = hatched135(_base*math.sqrt(64))
 235
 236
 237 class crosshatched(pattern):
 238     def __init__(self, dist, angle, strokestyles=[]):
 239         pattern.__init__(self, painttype=1, tilingtype=1, xstep=dist, ystep=dist, bbox=None, trafo=trafo.rotate(angle))
 240         self.strokestyles = attr.mergeattrs([style.linewidth.THIN] + strokestyles)
 241         attr.checkattrs(self.strokestyles, [style.strokestyle])
 242         self.dist = dist
 243         self.angle = angle
 244         self.stroke(path.line_pt(0, 0, 0, unit.topt(dist)), self.strokestyles)
 245         self.stroke(path.line_pt(0, 0, unit.topt(dist), 0), self.strokestyles)
 246
 247     def __call__(self, dist=None, angle=None, strokestyles=None):
 248         if dist is None:
 249             dist = self.dist
 250         if angle is None:
 251             angle = self.angle
 252         if strokestyles is None:
 253             strokestyles = self.strokestyles
 254         return crosshatched(dist, angle, strokestyles)
 255
 256 crosshatched0 = crosshatched(_base, 0)
 257 crosshatched0.SMALL = crosshatched0(_base/math.sqrt(64))
 258 crosshatched0.SMALl = crosshatched0(_base/math.sqrt(32))
 259 crosshatched0.SMAll = crosshatched0(_base/math.sqrt(16))
 260 crosshatched0.SMall = crosshatched0(_base/math.sqrt(8))
 261 crosshatched0.Small = crosshatched0(_base/math.sqrt(4))
 262 crosshatched0.small = crosshatched0(_base/math.sqrt(2))
 263 crosshatched0.normal = crosshatched0
 264 crosshatched0.large = crosshatched0(_base*math.sqrt(2))
 265 crosshatched0.Large = crosshatched0(_base*math.sqrt(4))
 266 crosshatched0.LArge = crosshatched0(_base*math.sqrt(8))
 267 crosshatched0.LARge = crosshatched0(_base*math.sqrt(16))
 268 crosshatched0.LARGe = crosshatched0(_base*math.sqrt(32))
 269 crosshatched0.LARGE = crosshatched0(_base*math.sqrt(64))
 270
 271 crosshatched45 = crosshatched(_base, 45)
 272 crosshatched45.SMALL = crosshatched45(_base/math.sqrt(64))
 273 crosshatched45.SMALl = crosshatched45(_base/math.sqrt(32))
 274 crosshatched45.SMAll = crosshatched45(_base/math.sqrt(16))
 275 crosshatched45.SMall = crosshatched45(_base/math.sqrt(8))
 276 crosshatched45.Small = crosshatched45(_base/math.sqrt(4))
 277 crosshatched45.small = crosshatched45(_base/math.sqrt(2))
 278 crosshatched45.normal = crosshatched45
 279 crosshatched45.large = crosshatched45(_base*math.sqrt(2))
 280 crosshatched45.Large = crosshatched45(_base*math.sqrt(4))
 281 crosshatched45.LArge = crosshatched45(_base*math.sqrt(8))
 282 crosshatched45.LARge = crosshatched45(_base*math.sqrt(16))
 283 crosshatched45.LARGe = crosshatched45(_base*math.sqrt(32))
 284 crosshatched45.LARGE = crosshatched45(_base*math.sqrt(64))
 285
 286
 287 class PDFpattern(pdfwriter.PDFobject):
 288
 289     def __init__(self, name, patterntype, painttype, tilingtype, bbox, xstep, ystep, trafo,
 290                  patternproc, writer, registry, patternregistry):
 291         self.patternregistry = patternregistry
 292         pdfwriter.PDFobject.__init__(self, "pattern", name)
 293         registry.addresource("Pattern", name, self)
 294
 295         self.name = name
 296         self.patterntype = patterntype
 297         self.painttype = painttype
 298         self.tilingtype = tilingtype
 299         self.bbox = bbox
 300         self.xstep = xstep
 301         self.ystep = ystep
 302         self.trafo = trafo
 303         self.patternproc = patternproc
 304
 305     def write(self, file, writer, registry):
 306         file.write("<<\n"
 307                    "/Type /Pattern\n"
 308                    "/PatternType %d\n" % self.patterntype)
 309         file.write("/PaintType %d\n" % self.painttype)
 310         file.write("/TilingType %d\n" % self.tilingtype)
 311         file.write("/BBox [%d %d %d %d]\n" % self.bbox.lowrestuple_pt())
 312         file.write("/XStep %f\n" % self.xstep)
 313         file.write("/YStep %f\n" % self.ystep)
 314         file.write("/Matrix %s\n" % str(self.trafo))
 315         file.write("/Resources ")
 316         self.patternregistry.writeresources(file)
 317         if writer.compress:
 318             import zlib
 319             content = zlib.compress(self.patternproc)
 320         else:
 321             content = self.patternproc
 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_bytes(content)
 329         file.write("endstream\n")