wxPython/wx/lib/fancytext.py

   1 # 12/02/2003 - Jeff Grimmett (grimmtooth@softhome.net)
   2 #
   3 # o Updated for 2.5 compatability.
   4 #
   5
   6 """<font weight="bold" size="16">FancyText</font> -- <font style="italic" size="16">methods for rendering XML specified text</font>
   7 <font family="swiss" size="12">
   8 This module exports four main methods::
   9 <font family="fixed" style="slant">
  10     def GetExtent(str, dc=None, enclose=True)
  11     def GetFullExtent(str, dc=None, enclose=True)
  12     def RenderToBitmap(str, background=None, enclose=True)
  13     def RenderToDC(str, dc, x, y, enclose=True)
  14 </font>
  15 In all cases, 'str' is an XML string. Note that start and end tags
  16 are only required if *enclose* is set to False. In this case the
  17 text should be wrapped in FancyText tags.
  18
  19 In addition, the module exports one class::
  20 <font family="fixed" style="slant">
  21     class StaticFancyText(self, window, id, text, background, ...)
  22 </font>
  23 This class works similar to StaticText except it interprets its text
  24 as FancyText.
  25
  26 The text can support<sup>superscripts</sup> and <sub>subscripts</sub>, text
  27 in different <font size="20">sizes</font>, <font color="blue">colors</font>, <font style="italic">styles</font>, <font weight="bold">weights</font> and
  28 <font family="script">families</font>. It also supports a limited set of symbols,
  29 currently <times/>, <infinity/>, <angle/> as well as greek letters in both
  30 upper case (<Alpha/><Beta/>...<Omega/>) and lower case (<alpha/><beta/>...<omega/>).
  31
  32 We can use doctest/guitest to display this string in all its marked up glory.
  33 <font family="fixed">
  34 >>> frame = wx.Frame(wx.NULL, -1, "FancyText demo", wx.DefaultPosition)
  35 >>> sft = StaticFancyText(frame, -1, __doc__, wx.Brush("light grey", wx.SOLID))
  36 >>> frame.SetClientSize(sft.GetSize())
  37 >>> didit = frame.Show()
  38 >>> from guitest import PauseTests; PauseTests()
  39
  40 </font></font>
  41 The End"""
  42
  43 # Copyright 2001-2003 Timothy Hochberg
  44 # Use as you see fit. No warantees, I cannot be held responsible, etc.
  45
  46 import copy
  47 import math
  48 import sys
  49
  50 import wx
  51 import xml.parsers.expat
  52
  53 __all__ = "GetExtent", "GetFullExtent", "RenderToBitmap", "RenderToDC", "StaticFancyText"
  54
  55 if sys.platform == "win32":
  56     _greekEncoding = str(wx.FONTENCODING_CP1253)
  57 else:
  58     _greekEncoding = str(wx.FONTENCODING_ISO8859_7)
  59
  60 _families = {"fixed" : wx.FIXED, "default" : wx.DEFAULT, "decorative" : wx.DECORATIVE, "roman" : wx.ROMAN,
  61                 "script" : wx.SCRIPT, "swiss" : wx.SWISS, "modern" : wx.MODERN}
  62 _styles = {"normal" : wx.NORMAL, "slant" : wx.SLANT, "italic" : wx.ITALIC}
  63 _weights = {"normal" : wx.NORMAL, "light" : wx.LIGHT, "bold" : wx.BOLD}
  64
  65 # The next three classes: Renderer, SizeRenderer and DCRenderer are
  66 # what you will need to override to extend the XML language. All of
  67 # the font stuff as well as the subscript and superscript stuff are in
  68 # Renderer.
  69
  70 _greek_letters = ("alpha", "beta", "gamma", "delta", "epsilon",  "zeta",
  71                  "eta", "theta", "iota", "kappa", "lambda", "mu", "nu",
  72                  "xi", "omnikron", "pi", "rho", "altsigma", "sigma", "tau", "upsilon",
  73                  "phi", "chi", "psi", "omega")
  74
  75 def iround(number):
  76     return int(round(number))
  77
  78 def iceil(number):
  79     return int(math.ceil(number))
  80
  81 class Renderer:
  82     """Class for rendering XML marked up text.
  83
  84     See the module docstring for a description of the markup.
  85
  86     This class must be subclassed and the methods the methods that do
  87     the drawing overridden for a particular output device.
  88
  89     """
  90     defaultSize = None
  91     defaultFamily = wx.DEFAULT
  92     defaultStyle = wx.NORMAL
  93     defaultWeight = wx.NORMAL
  94     defaultEncoding = None
  95     defaultColor = "black"
  96
  97     def __init__(self, dc=None, x=0, y=None):
  98         if dc == None:
  99             dc = wx.MemoryDC()
 100         self.dc = dc
 101         self.offsets = [0]
 102         self.fonts = [{}]
 103         self.width = self.height = 0
 104         self.x = x
 105         self.minY = self.maxY = self._y = y
 106         if Renderer.defaultSize is None:
 107             Renderer.defaultSize = wx.NORMAL_FONT.GetPointSize()
 108         if Renderer.defaultEncoding is None:
 109             Renderer.defaultEncoding = wx.Font_GetDefaultEncoding()
 110
 111     def getY(self):
 112         if self._y is None:
 113             self.minY = self.maxY = self._y = self.dc.GetTextExtent("M")[1]
 114         return self._y
 115     def setY(self, value):
 116         self._y = y
 117     y = property(getY, setY)
 118
 119     def startElement(self, name, attrs):
 120         method = "start_" + name
 121         if not hasattr(self, method):
 122             raise ValueError("XML tag '%s' not supported" % name)
 123         getattr(self, method)(attrs)
 124
 125     def endElement(self, name):
 126         methname = "end_" + name
 127         if hasattr(self, methname):
 128             getattr(self, methname)()
 129         elif hasattr(self, "start_" + name):
 130             pass
 131         else:
 132             raise ValueError("XML tag '%s' not supported" % methname)
 133
 134     def characterData(self, data):
 135         self.dc.SetFont(self.getCurrentFont())
 136         for i, chunk in enumerate(data.split('\n')):
 137             if i:
 138                 self.x = 0
 139                 self.y = self.mayY = self.maxY + self.dc.GetTextExtent("M")[1]
 140             if chunk:
 141                 width, height, descent, extl = self.dc.GetFullTextExtent(chunk)
 142                 self.renderCharacterData(data, iround(self.x), iround(self.y + self.offsets[-1] - height + descent))
 143             else:
 144                 width = height = descent = extl = 0
 145             self.updateDims(width, height, descent, extl)
 146
 147     def updateDims(self, width, height, descent, externalLeading):
 148         self.x += width
 149         self.width = max(self.x, self.width)
 150         self.minY = min(self.minY, self.y+self.offsets[-1]-height+descent)
 151         self.maxY = max(self.maxY, self.y+self.offsets[-1]+descent)
 152         self.height = self.maxY - self.minY
 153
 154     def start_FancyText(self, attrs):
 155         pass
 156     start_wxFancyText = start_FancyText # For backward compatibility
 157
 158     def start_font(self, attrs):
 159         for key, value in attrs.items():
 160             if key == "size":
 161                 value = int(value)
 162             elif key == "family":
 163                 value = _families[value]
 164             elif key == "style":
 165                 value = _styles[value]
 166             elif key == "weight":
 167                 value = _weights[value]
 168             elif key == "encoding":
 169                 value = int(value)
 170             elif key == "color":
 171                 pass
 172             else:
 173                 raise ValueError("unknown font attribute '%s'" % key)
 174             attrs[key] = value
 175         font = copy.copy(self.fonts[-1])
 176         font.update(attrs)
 177         self.fonts.append(font)
 178
 179     def end_font(self):
 180         self.fonts.pop()
 181
 182     def start_sub(self, attrs):
 183         if attrs.keys():
 184             raise ValueError("<sub> does not take attributes")
 185         font = self.getCurrentFont()
 186         self.offsets.append(self.offsets[-1] + self.dc.GetFullTextExtent("M", font)[1]*0.5)
 187         self.start_font({"size" : font.GetPointSize() * 0.8})
 188
 189     def end_sub(self):
 190         self.fonts.pop()
 191         self.offsets.pop()
 192
 193     def start_sup(self, attrs):
 194         if attrs.keys():
 195             raise ValueError("<sup> does not take attributes")
 196         font = self.getCurrentFont()
 197         self.offsets.append(self.offsets[-1] - self.dc.GetFullTextExtent("M", font)[1]*0.3)
 198         self.start_font({"size" : font.GetPointSize() * 0.8})
 199
 200     def end_sup(self):
 201         self.fonts.pop()
 202         self.offsets.pop()
 203
 204     def getCurrentFont(self):
 205         font = self.fonts[-1]
 206         return wx.TheFontList.FindOrCreateFont(font.get("size", self.defaultSize),
 207                              font.get("family", self.defaultFamily),
 208                              font.get("style", self.defaultStyle),
 209                              font.get("weight", self.defaultWeight),
 210                              encoding = font.get("encoding", self.defaultEncoding))
 211
 212     def getCurrentColor(self):
 213         font = self.fonts[-1]
 214         return wx.TheColourDatabase.FindColour(font.get("color", self.defaultColor))
 215
 216     def getCurrentPen(self):
 217         return wx.ThePenList.FindOrCreatePen(self.getCurrentColor(), 1, wx.SOLID)
 218
 219     def renderCharacterData(self, data, x, y):
 220         raise NotImplementedError()
 221
 222
 223 def _addGreek():
 224     alpha = 0xE1
 225     Alpha = 0xC1
 226     def end(self):
 227         pass
 228     for i, name in enumerate(_greek_letters):
 229         def start(self, attrs, code=chr(alpha+i)):
 230             self.start_font({"encoding" : _greekEncoding})
 231             self.characterData(code)
 232             self.end_font()
 233         setattr(Renderer, "start_%s" % name, start)
 234         setattr(Renderer, "end_%s" % name, end)
 235         if name == "altsigma":
 236             continue # There is no capital for altsigma
 237         def start(self, attrs, code=chr(Alpha+i)):
 238             self.start_font({"encoding" : _greekEncoding})
 239             self.characterData(code)
 240             self.end_font()
 241         setattr(Renderer, "start_%s" % name.capitalize(), start)
 242         setattr(Renderer, "end_%s" % name.capitalize(), end)
 243 _addGreek()
 244
 245
 246
 247 class SizeRenderer(Renderer):
 248     """Processes text as if rendering it, but just computes the size."""
 249
 250     def __init__(self, dc=None):
 251         Renderer.__init__(self, dc, 0, 0)
 252
 253     def renderCharacterData(self, data, x, y):
 254         pass
 255
 256     def start_angle(self, attrs):
 257         self.characterData("M")
 258
 259     def start_infinity(self, attrs):
 260         width, height = self.dc.GetTextExtent("M")
 261         width = max(width, 10)
 262         height = max(height, width / 2)
 263         self.updateDims(width, height, 0, 0)
 264
 265     def start_times(self, attrs):
 266         self.characterData("M")
 267
 268     def start_in(self, attrs):
 269         self.characterData("M")
 270
 271     def start_times(self, attrs):
 272         self.characterData("M")
 273
 274
 275 class DCRenderer(Renderer):
 276     """Renders text to a wxPython device context DC."""
 277
 278     def renderCharacterData(self, data, x, y):
 279         self.dc.SetTextForeground(self.getCurrentColor())
 280         self.dc.DrawText(data, x, y)
 281
 282     def start_angle(self, attrs):
 283         self.dc.SetFont(self.getCurrentFont())
 284         self.dc.SetPen(self.getCurrentPen())
 285         width, height, descent, leading = self.dc.GetFullTextExtent("M")
 286         y = self.y + self.offsets[-1]
 287         self.dc.DrawLine(iround(self.x), iround(y), iround( self.x+width), iround(y))
 288         self.dc.DrawLine(iround(self.x), iround(y), iround(self.x+width), iround(y-width))
 289         self.updateDims(width, height, descent, leading)
 290
 291
 292     def start_infinity(self, attrs):
 293         self.dc.SetFont(self.getCurrentFont())
 294         self.dc.SetPen(self.getCurrentPen())
 295         width, height, descent, leading = self.dc.GetFullTextExtent("M")
 296         width = max(width, 10)
 297         height = max(height, width / 2)
 298         self.dc.SetPen(wx.Pen(self.getCurrentColor(), max(1, width/10)))
 299         self.dc.SetBrush(wx.TRANSPARENT_BRUSH)
 300         y = self.y + self.offsets[-1]
 301         r = iround( 0.95 * width / 4)
 302         xc = (2*self.x + width) / 2
 303         yc = iround(y-1.5*r)
 304         self.dc.DrawCircle(xc - r, yc, r)
 305         self.dc.DrawCircle(xc + r, yc, r)
 306         self.updateDims(width, height, 0, 0)
 307
 308     def start_times(self, attrs):
 309         self.dc.SetFont(self.getCurrentFont())
 310         self.dc.SetPen(self.getCurrentPen())
 311         width, height, descent, leading = self.dc.GetFullTextExtent("M")
 312         y = self.y + self.offsets[-1]
 313         width *= 0.8
 314         width = iround(width+.5)
 315         self.dc.SetPen(wx.Pen(self.getCurrentColor(), 1))
 316         self.dc.DrawLine(iround(self.x), iround(y-width), iround(self.x+width-1), iround(y-1))
 317         self.dc.DrawLine(iround(self.x), iround(y-2), iround(self.x+width-1), iround(y-width-1))
 318         self.updateDims(width, height, 0, 0)
 319
 320
 321 def RenderToRenderer(str, renderer, enclose=True):
 322     try:
 323         if enclose:
 324             str = '<?xml version="1.0"?><FancyText>%s</FancyText>' % str
 325         p = xml.parsers.expat.ParserCreate()
 326         p.returns_unicode = 0
 327         p.StartElementHandler = renderer.startElement
 328         p.EndElementHandler = renderer.endElement
 329         p.CharacterDataHandler = renderer.characterData
 330         p.Parse(str, 1)
 331     except xml.parsers.expat.error, err:
 332         raise ValueError('error parsing text text "%s": %s' % (str, err))
 333
 334
 335 # Public interface
 336
 337
 338 def GetExtent(str, dc=None, enclose=True):
 339     "Return the extent of str"
 340     renderer = SizeRenderer(dc)
 341     RenderToRenderer(str, renderer, enclose)
 342     return iceil(renderer.width), iceil(renderer.height) # XXX round up
 343
 344
 345 def GetFullExtent(str, dc=None, enclose=True):
 346     renderer = SizeRenderer(dc)
 347     RenderToRenderer(str, renderer, enclose)
 348     return iceil(renderer.width), iceil(renderer.height), -iceil(renderer.minY) # XXX round up
 349
 350
 351 def RenderToBitmap(str, background=None, enclose=1):
 352     "Return str rendered on a minumum size bitmap"
 353     dc = wx.MemoryDC()
 354     width, height, dy = GetFullExtent(str, dc, enclose)
 355     bmp = wx.EmptyBitmap(width, height)
 356     dc.SelectObject(bmp)
 357     if background is None:
 358         dc.SetBackground(wx.WHITE_BRUSH)
 359     else:
 360         dc.SetBackground(background)
 361     dc.Clear()
 362     renderer = DCRenderer(dc, y=dy)
 363     dc.BeginDrawing()
 364     RenderToRenderer(str, renderer, enclose)
 365     dc.EndDrawing()
 366     dc.SelectObject(wx.NullBitmap)
 367     if background is None:
 368         img = wx.ImageFromBitmap(bmp)
 369         bg = dc.GetBackground().GetColour()
 370         img.SetMaskColour(bg.Red(), bg.Green(), bg.Blue())
 371         bmp = img.ConvertToBitmap()
 372     return bmp
 373
 374
 375 def RenderToDC(str, dc, x, y, enclose=1):
 376     "Render str onto a wxDC at (x,y)"
 377     width, height, dy = GetFullExtent(str, dc)
 378     renderer = DCRenderer(dc, x, y+dy)
 379     RenderToRenderer(str, renderer, enclose)
 380
 381
 382 class StaticFancyText(wx.StaticBitmap):
 383     def __init__(self, window, id, text, *args, **kargs):
 384         args = list(args)
 385         kargs.setdefault('name', 'staticFancyText')
 386         if 'background' in kargs:
 387             background = kargs.pop('background')
 388         elif args:
 389             background = args.pop(0)
 390         else:
 391             background = wx.Brush(window.GetBackgroundColour(), wx.SOLID)
 392
 393         bmp = RenderToBitmap(text, background)
 394         wx.StaticBitmap.__init__(self, window, id, bmp, *args, **kargs)
 395
 396
 397 # Old names for backward compatibiliry
 398 getExtent = GetExtent
 399 renderToBitmap = RenderToBitmap
 400 renderToDC = RenderToDC
 401
 402
 403 # Test Driver
 404
 405 def test():
 406     app = wx.PySimpleApp()
 407     box = wx.BoxSizer(wx.VERTICAL)
 408     frame = wx.Frame(None, -1, "FancyText demo", wx.DefaultPosition)
 409     frame.SetBackgroundColour("light grey")
 410     sft = StaticFancyText(frame, -1, __doc__)
 411     box.Add(sft, 1, wx.EXPAND)
 412     frame.SetSizer(box)
 413     frame.SetAutoLayout(True)
 414     box.Fit(frame)
 415     box.SetSizeHints(frame)
 416     frame.Show()
 417     app.MainLoop()
 418
 419 if __name__ == "__main__":
 420     test()
 421
 422