1 # -*- coding: utf-8 -*-
3 # Copyright (C) 2000-2005 by Yasushi Saito (yasushi.saito@gmail.com)
5 # Jockey is free software; you can redistribute it and/or modify it
6 # under the terms of the GNU General Public License as published by the
7 # Free Software Foundation; either version 2, or (at your option) any
10 # Jockey is distributed in the hope that it will be useful, but WITHOUT
11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 import sys,string,re,math
16 from xml.dom.minidom import Document,Comment
22 # Note we flip all y-coords and negate all angles because SVG's coord
23 # system is inverted wrt postscript/PDF - note it's not enough to
24 # scale(1,-1) since that turns text into mirror writing with wrong origin
26 _comment_p = 0 # whether comment() writes output
28 # Convert a PyChart color object to an SVG rgb() value
29 def _svgcolor(color): # see color.py
30 return 'rgb(%d,%d,%d)' % tuple(map(lambda x:int(255*x),
31 [color.r,color.g,color.b]))
33 # Take an SVG 'style' attribute string like 'stroke:none;fill:black'
34 # and parse it into a dictionary like {'stroke' : 'none', 'fill' : 'black'}
35 def _parseStyleStr(s):
38 # parses L -> R so later keys overwrite earlier ones
39 for keyval in s.split(';'):
40 l = keyval.strip().split(':')
41 if l and len(l) == 2: styledict[l[0].strip()] = l[1].strip()
44 # Make an SVG style string from the dictionary described above
45 def _makeStyleStr(styledict):
47 for key in styledict.keys():
48 s += "%s:%s;"%(key,styledict[key])
51 def _protectCurrentChildren(elt):
52 # If elt is a group, check to see whether there are any non-comment
53 # children, and if so, create a new group to hold attributes
54 # to avoid affecting previous children. Return either the current
55 # elt or the newly generated group.
56 if (elt.nodeName == 'g') :
57 for kid in elt.childNodes :
58 if kid.nodeType != Comment.nodeType:
59 g = elt.ownerDocument.createElement('g')
60 g.setAttribute('auto','')
62 g.appendChild(g.ownerDocument.createComment
63 ('auto-generated group'))
69 class T(basecanvas.T):
70 def __init__(self, fname):
71 basecanvas.T.__init__(self)
72 self.__out_fname = fname
73 self.__xmin, self.__xmax, self.__ymin, self.__ymax = 0,0,0,0
74 self.__doc = Document()
75 self.__doc.appendChild(self.__doc.createComment
76 ('Created by PyChart ' + version.version + ' ' + version.copyright))
77 self.__svg = self.__doc.createElement('svg') # the svg doc
78 self.__doc.appendChild(self.__svg)
79 self.__defs = self.__doc.createElement('defs') # for clip paths
80 self.__svg.appendChild(self.__defs)
81 self.__currElt = self.__svg
82 self.gsave() # create top-level group for dflt styles
83 self._updateStyle(font_family = theme.default_font_family,
84 font_size = theme.default_font_size,
85 font_style = 'normal',
86 font_weight = 'normal',
87 font_stretch = 'normal',
89 stroke = 'rgb(0,0,0)', #SVG dflt none, PS dflt blk
90 stroke_width = theme.default_line_width,
91 stroke_linejoin = 'miter',
92 stroke_linecap = 'butt',
93 stroke_dasharray = 'none')
95 def _updateStyle(self, **addstyledict):
96 elt = _protectCurrentChildren(self.__currElt)
98 # fetch the current styles for this node
99 mystyledict = _parseStyleStr(elt.getAttribute('style'))
101 # concat all parent style strings to get dflt styles for this node
102 parent,s = elt.parentNode,''
103 while parent.nodeType != Document.nodeType :
104 # prepend parent str so later keys will override earlier ones
105 s = parent.getAttribute('style') + s
106 parent = parent.parentNode
107 dfltstyledict = _parseStyleStr(s)
109 # Do some pre-processing on the caller-supplied add'l styles
110 # Convert '_' to '-' so caller can specify style tags as python
111 # variable names, eg. stroke_width => stroke-width.
112 # Also convert all RHS values to strs
113 for key in addstyledict.keys():
114 k = re.sub('_','-',key)
115 addstyledict[k] = str(addstyledict[key]) # all vals => strs
116 if (k != key) : del addstyledict[key]
118 for k in addstyledict.keys() :
119 if (mystyledict.has_key(k) or # need to overwrite it
120 (not dfltstyledict.has_key(k)) or # need to set it
121 dfltstyledict[k] != addstyledict[k]) : # need to override it
122 mystyledict[k] = addstyledict[k]
124 s = _makeStyleStr(mystyledict)
125 if s : elt.setAttribute('style',s)
129 ####################################################################
130 # methods below define the pychart backend device API
132 # First are a set of methods to start, construct and finalize a path
134 def newpath(self): # Start a new path
135 if (self.__currElt.nodeName != 'g') :
136 raise OverflowError, "No containing group for newpath"
137 # Just insert a new 'path' element into the document
138 p = self.__doc.createElement('path')
139 self.__currElt.appendChild(p)
142 # This set of methods add data to an existing path element,
143 # simply add to the 'd' (data) attribute of the path elt
145 def moveto(self, x, y): #
146 if (self.__currElt.nodeName != 'path') :
147 raise OverflowError, "No path for moveto"
148 d = ' '.join([self.__currElt.getAttribute('d'),'M',`x`,`-y`]).strip()
149 self.__currElt.setAttribute('d', d)
150 def lineto(self, x, y):
151 if (self.__currElt.nodeName != 'path') :
152 raise OverflowError, "No path for lineto"
153 d = ' '.join([self.__currElt.getAttribute('d'),'L',`x`,`-y`]).strip()
154 self.__currElt.setAttribute('d', d)
155 def path_arc(self, x, y, radius, ratio, start_angle, end_angle):
156 # mimic PS 'arc' given radius, yr/xr (=eccentricity), start and
157 # end angles. PS arc draws from CP (if exists) to arc start,
158 # then draws arc in counterclockwise dir from start to end
159 # SVG provides an arc command that draws a segment of an
160 # ellipse (but not a full circle) given these args:
161 # A xr yr rotate majorArcFlag counterclockwiseFlag xe ye
162 # We don't use rotate(=0) and flipped axes => all arcs are clockwise
164 if (self.__currElt.nodeName != 'path') :
165 raise OverflowError, "No path for path_arc"
167 self.comment('x=%g, y=%g, r=%g, :=%g, %g-%g'
168 % (x,y,radius,ratio,start_angle,end_angle))
170 xs = x+radius*math.cos(2*math.pi/360.*start_angle)
171 ys = y+ratio*radius*math.sin(2*math.pi/360.*start_angle)
172 xe = x+radius*math.cos(2*math.pi/360.*end_angle)
173 ye = y+ratio*radius*math.sin(2*math.pi/360.*end_angle)
174 if (end_angle < start_angle) : # make end bigger than start
175 while end_angle <= start_angle: # '<=' so 360->0 becomes 360->720
177 full_circ = (end_angle - start_angle >= 360) # draw a full circle?
179 d = self.__currElt.getAttribute('d')
180 d += ' %s %g %g' % (d and 'L' or 'M',xs,-ys) # draw from CP, if exists
181 if (radius > 0) : # skip, eg. 0-radius 'rounded' corners which blowup
183 # If we're drawing a full circle, move to the end coord
184 # and draw half a circle to the reflected xe,ye
185 d += ' M %g %g A %g %g 0 1 0 %g %g'%(xe,-ye,
188 # Draw arc from the CP (either reflected xe,ye for full circle else
189 # xs,ys) to the end coord - note with full_circ the
190 # 'bigArcFlag' value is moot, with exactly 180deg left to draw
191 d += ' A %g %g 0 %d 0 %g %g' % (radius,radius*ratio,
192 end_angle-start_angle>180,
194 self.__currElt.setAttribute('d',d.strip())
195 def curveto(self, x1,y1,x2,y2,x3,y3):
196 # Equivalent of PostScript's x1 y1 x2 y2 x3 y3 curveto which
197 # draws a cubic bezier curve from curr pt to x3,y3 with ctrl points
199 # In SVG this is just d='[M x0 y0] C x1 y1 x2 y2 x3 y3'
200 #! I can't find an example of this being used to test it
201 if (self.__currElt.nodeNode != 'path') :
202 raise OverflowError, "No path for curveto"
203 d = ' '.join([self.__currElt.getAttribute('d'),'C',
204 `x1`,`-y1`,`x2`,`-y2`,`x3`,`-y3`,]).strip()
205 self.__currElt.setAttribute('d', d)
206 def closepath(self): # close back to start of path
207 if (self.__currElt.nodeName != 'path') :
208 raise OverflowError, "No path for closepath"
209 d = ' '.join([self.__currElt.getAttribute('d'),'Z']).strip()
210 self.__currElt.setAttribute('d', d)
212 # Next we have three methods for finalizing a path element,
213 # either fill it, clip to it, or draw it (stroke)
214 # canvas.polygon() can generate fill/clip cmds with
215 # no corresponding path so just ignore them
217 if (self.__currElt.nodeName != 'path') :
218 self.comment('No path - ignoring stroke')
220 self._updateStyle(fill='none')
221 self.__currElt = self.__currElt.parentNode
223 if (self.__currElt.nodeName != 'path') :
224 self.comment('No path - ignoring fill')
226 self._updateStyle(stroke='none')
227 self.__currElt = self.__currElt.parentNode
229 if (self.__currElt.nodeName != 'path') :
230 self.comment('No path - ignoring clip')
233 # remove the current path from the tree ...
235 self.__currElt=p.parentNode
236 self.__currElt.removeChild(p)
238 # ... add it to a clipPath elt in the defs section
239 clip = self.__doc.createElement('clipPath')
240 clipid = 'clip'+`len(self.__defs.childNodes)`
241 clip.setAttribute('id',clipid)
243 self.__defs.appendChild(clip)
245 # ... update the local style to point to it
246 self._updateStyle(clip_path = 'url(#%s)'%clipid)
248 # The text_xxx routines specify the start/end and contents of text
249 def text_begin(self):
250 if (self.__currElt.nodeName != 'g') :
251 raise ValueError, "No group for text block"
252 t = self.__doc.createElement('text')
253 self.__currElt.appendChild(t)
255 def text_moveto(self, x, y, angle):
256 if (self.__currElt.nodeName != 'text') :
257 raise ValueError, "No text for moveto"
258 self.__currElt.setAttribute('x',`x`)
259 self.__currElt.setAttribute('y',`-y`)
261 self.__currElt.setAttribute('transform',
262 'rotate(%g,%g,%g)' % (-angle,x,-y))
263 def text_show(self, font_name, size, color, str):
264 if (self.__currElt.nodeName != 'text') :
265 raise ValueError, "No text for show"
267 # PyChart constructs a postscript font name, for example:
269 # Helvetica Helvetica-Bold Helvetica-Oblique Helvetica-BoldOblique
270 # Helvetica-Narrow Times-Roman Times-Italic
271 # Symbol Palatino-Roman Bookman-Demi Courier AvantGarde-Book
273 # We need to deconstruct this to get the font-family (the
274 # piece before the '-'), and other characteristics.
275 # Note that 'Courier' seems to correspond to SVGs 'CourierNew'
276 # and that the SVG Symbol font is Unicode where the ascii text
277 # 'Symbol' doesn't create greek characters like 'Sigma ...' -
278 # should really pass a unicode string, or provide translation
281 # font-style = normal (aka roman) | italic | oblique
282 # font-weight = normal | bold (aka demi?)
283 # font-stretch = normal | wider | narrower | ultra-condensed |
284 # extra-condensed | condensed | semi-condensed |
285 # semi-expanded | expanded | extra-expanded | ultra-expanded
286 # ('narrow' seems to correspond to 'condensed')
288 m = re.match(r'([^-]*)(-.*)?',font_name)
289 font_name,modifiers = m.groups()
290 if font_name == 'Courier' : font_name = 'CourierNew'
291 font_style = font_weight = font_stretch = 'normal'
293 if re.search('Italic',modifiers) : font_style = 'italic'
294 elif re.search('Oblique',modifiers) : font_style = 'oblique'
295 if re.search('Bold|Demi',modifiers) : font_weight = 'bold'
296 if re.search('Narrow',modifiers) : font_stretch = 'condensed'
297 #! translate ascii symbol font chars -> unicode (see www.unicode.org)
298 #! http://www.unicode.org/Public/MAPPINGS/VENDORS/ADOBE/symbol.txt
299 #! but xml Text element writes unicode chars as '?' to XML file...
300 str = re.sub(r'\\([()])',r'\1',str) # unescape brackets
301 self._updateStyle(fill=_svgcolor(color),
303 font_family=font_name,
305 font_style=font_style,
306 font_weight=font_weight,
307 font_stretch=font_stretch)
308 self.__currElt.appendChild(self.__doc.createTextNode(str))
310 if (self.__currElt.nodeName != 'text') :
311 raise ValueError, "No text for close"
312 self.__currElt = self.__currElt.parentNode
315 # Three methods that change the local style of elements
316 # If applied to a group, they persist until the next grestore,
317 # If applied within a path element, they only affect that path -
318 # although this may not in general correspond to (say) PostScript
319 # behavior, it appears to correspond to reflect mode of use of this API
320 def set_fill_color(self, color):
321 self._updateStyle(fill=_svgcolor(color))
322 def set_stroke_color(self, color):
323 self._updateStyle(stroke=_svgcolor(color))
324 def set_line_style(self, style): # see line_style.py
325 linecap = {0:'butt', 1:'round', 2:'square'}
326 linejoin = {0:'miter', 1:'round', 2:'bevel'}
327 if style.dash: dash = ','.join(map(str,style.dash))
329 self._updateStyle(stroke_width = style.width,
330 stroke = _svgcolor(style.color),
331 stroke_linecap = linecap[style.cap_style],
332 stroke_linejoin = linejoin[style.join_style],
333 stroke_dasharray = dash)
335 # gsave & grestore respectively push & pop a new context to hold
336 # new style and transform parameters. push/pop transformation are
337 # similar but explicitly specify a coordinate transform at the
340 if (self.__currElt.nodeName not in ['g','svg']) :
341 raise ValueError, "No group for gsave"
342 g = self.__doc.createElement('g')
343 self.__currElt.appendChild(g)
346 if (self.__currElt.nodeName != 'g'):
347 raise ValueError, "No group for grestore"
348 # first pop off any auto-generated groups (see protectCurrentChildren)
349 while (self.__currElt.hasAttribute('auto')) :
350 self.__currElt.removeAttribute('auto')
351 self.__currElt = self.__currElt.parentNode
352 # then pop off the original caller-generated group
353 self.__currElt = self.__currElt.parentNode
355 def push_transformation(self, baseloc, scale, angle, in_text=0):
356 #? in_text arg appears to always be ignored
358 # In some cases this gets called after newpath, with
359 # corresonding pop_transformation called after the path is
360 # finalized so we check specifically for that, and generate
361 # an enclosing group to hold the incomplete path element
362 # We could add the transform directly to the path element
363 # (like we do with line-style etc) but that makes it harder
364 # to handle the closing 'pop' and might lead to inconsitency
365 # with PostScript if the closing pop doesn't come right after
369 if elt.nodeName == 'g':
371 elif (elt.nodeName == 'path' and not elt.hasAttribute('d')) :
376 raise ValueError, "Illegal placement of push_transformation"
380 t += 'translate(%g,%g) '%(baseloc[0],-baseloc[1])
382 t += 'rotate(%g) '%-angle
384 t += 'scale(%g,%g) '%tuple(scale)
387 self.__currElt.setAttribute('transform',t.strip())
388 if elt: # elt has incomplete 'path' or None
389 self.__currElt.appendChild(elt)
392 def pop_transformation(self, in_text=0): #? in_text unused?
395 # If verbose, add comments to the output stream (helps debugging)
396 def comment(self, str):
398 self.__currElt.appendChild(self.__doc.createComment(str))
400 # The verbatim method is currently not supported - presumably with
401 # the SVG backend the user would require access to the DOM since
402 # we're not directly outputting plain text here
403 def verbatim(self, str):
404 self.__currElt.appendChild(self.__doc.createComment('verbatim not implemented: ' + str))
406 # The close() method finalizes the SVG document and flattens the
407 # DOM document to XML text to the specified file (or stdout)
409 basecanvas.T.close(self)
410 self.grestore() # matching the gsave in __init__
411 if (self.__currElt.nodeName != 'svg') :
412 raise ValueError, "Incomplete document at close!"
414 # Don't bother to output an empty document - this can happen
415 # when we get close()d immediately by theme reinit
416 if (len(self.__svg.childNodes[-1].childNodes) == 0) :
419 fp, need_close = self.open_output(self.__out_fname)
420 bbox = theme.adjust_bounding_box([self.__xmin, self.__ymin,
421 self.__xmax, self.__ymax])
422 self.__svg.setAttribute('viewBox','%g %g %g %g'
425 xscale(bbox[2])-xscale(bbox[0]),
426 yscale(bbox[3])-yscale(bbox[1])))
427 self.__doc.writexml(fp,'',' ','\n')