Baptiste,
Thank you so much for this tutorial. It was very easy to follow. I have a
couple of comments sprinkled through the instructions
On Wednesday 20 April 2005 7:13 pm, Baptiste Carvello wrote:
> Hello,
>
> I've been playing with the unicode rendering code that got added in
> matplotlib 0.74. All tests have been done on Linux with the 0.74-1
> debian package, lazy me... They should work on any platform, but you
> will have to find out the gory details (!).
>
> [ Most of these are examples, but there are a few remarks for the ps
> backend maintainers mostly, enclosed in square brackets in the text. No
> patches yet, but if you find the ideas useful, I can give it a try later. ]
>
> To try this out, you may also need the rather complete FreeFont unicode
> font: 1) download the ttf from
> http://savannah.nongnu.org/download/freefont/freefont-ttf.tar.gz
> 2) put the .ttf files in your prefered Truetype fonts directory
> 3) remove ~/.ttffont.cache
> 4) restart matplotlib
>
> Part I: Guess what I do for a living
>
> Get your favorite interactive backend and display pretty plots
>
> >>> plot([0.3,0.01,-0.01,-0.01,-0.1,-0.1,-0.3,-0.01,0.01,0.01,0.1,0.1,0.3]
> >>>,\
>
> ... [105,100,98,90,92,101,105,100,98,90,92,101,105],'kD-')
>
> >>> ylim(85,110)
> >>> xlabel(u'\u03bc\u2080H(T)', name='FreeSans')
> >>> ylabel(u'R(\u03a9)', name='FreeSans')
> >>> ^D
>
> or weird formulas
>
> >>> figtext(0.5,0.5,u'\u0127\u03c9 \u226a k\u0432T',name='FreeSerif',\
>
> ... size=30, ha='center', va='center', color='r')
>
> >>> ^D
>
> You can also save to svg, and even to postscript (or eps) provided you set
> the ps.useafm preference to False for now.
>
> Part II: All work and no play...
>
> >>> plot([0.3,0.01,-0.01,-0.01,-0.1,-0.1,-0.3,-0.01,0.01,0.01,0.1,0.1,0.3]
> >>>,\
>
> ... [105,100,107,90,92,101,105,100,98,90,92,101,105],'kD-')
>
> >>> ylim(85,110)
> >>> text(-0.01,107,u' \u261c booh! the ugly
> >>> artifact!',name='FreeSerif',\
>
> ... size=20, va='top', ha='left')
>
> >>> ^D
>
> ;-)
>
> Part III: Ugly, dirty and mean
>
> Now it's time to produce a PDF. Run ps2pdf on one of the plots above,
> at look at the ugly Type 3 fonts in your prefered PDF viewer.
> The only way to get decent PDF is to set ps.useafm to True again.
I copied my ttf fonts to matplotlib/fonts/ttf/, and reinstalled MPL from CVS.
At this point, with ps.useafm=False, I was able to generate a pdf with really
nice looking fonts. How were your fonts ugly?
>
> For this to work, we have to provide the AFM files for FreeFont:
> 1) download the source of the font from:
> http://savannah.nongnu.org/download/freefont/freefont-sfd.tar.gz
> 2) download fontforge from fontforge.sourceforge.net
> 3) open each .sfd file in freefont, and run File\Generate Fonts;
> choose type 'PS Type 0'; this should produce a corresponding
> .afm and .ps file; save the .ps file for later.
This was a little confusing, I think it should read 'open each .sfd file in
fontforge, and run ...' I was able to generate afm and ps files, but I think
something went wrong (see below). Did you have any trouble with this step?
> 4) move the afm file to a directory which is searched by matplotlib.
> Any subdirectory of /usr/share/fonts/ will do, provided said
> subdirectory is not a symlink
> [ is this a bug ? the implementation is in lib/font_manager.py,
> function x11FontDirectory(); os.path.walk() ignores symlinks ]
> 5) remove ~/.afmfont.cache
> 6) restart matplotlib
> 7) when you save the first .ps figure, the cache is rebuilt
At this point, I was not able to save a ps figure with ps.useafm=True. I get
the following error, maybe fontforge had trouble generating the afm files?
At any rate, these fonts look really great. I'm going to start working on the
unicode mappings so you can do '$\hbar$' instead of u'\u0127'. Again, thanks
for the tutorial! Can we commit the freefont ttf's to CVS?
Darren
/usr/lib/python2.4/site-packages/matplotlib/pylab.py in savefig(*args,
**kwargs)
738 def savefig(*args, **kwargs):
739 fig = gcf()
--> 740 return fig.savefig(*args, **kwargs)
741 if Figure.savefig.__doc__ is not None:
742 savefig.__doc__ = Figure.savefig.__doc__
/usr/lib/python2.4/site-packages/matplotlib/figure.py in savefig(self, *args,
**kwargs)
515 kwargs[key] = rcParams['savefig.%s'%key]
516
--> 517 self.canvas.print_figure(*args, **kwargs)
518
519
/usr/lib/python2.4/site-packages/matplotlib/backends/backend_gtkagg.py in
print_figure(self, filename, dpi, facecolor, edgecolor, orientation)
89 else:
90 agg = self.switch_backends(FigureCanvasAgg)
---> 91 try: agg.print_figure(filename, dpi, facecolor, edgecolor,
orientation)
92 except IOError, msg:
93 error_msg_gtk('Failed to save\nError message:
%s'%(msg,), self)
/usr/lib/python2.4/site-packages/matplotlib/backends/backend_agg.py in
print_figure(self, filename, dpi, facecolor, edgecolor, orientation)
403 from backend_ps import FigureCanvasPS # lazy import
404 ps = self.switch_backends(FigureCanvasPS)
--> 405 ps.print_figure(filename, dpi, facecolor, edgecolor,
orientation)
406 else:
407 raise IOError('Do not know know to handle extension
*%s' % ext)
/usr/lib/python2.4/site-packages/matplotlib/backends/backend_ps.py in
print_figure(self, outfile, dpi, facecolor, edgecolor, orientation)
909 self._pswriter = StringIO()
910 renderer = RendererPS(width, height, self._pswriter)
--> 911 self.figure.draw(renderer)
912
913 self.figure.set_facecolor(origfacecolor)
/usr/lib/python2.4/site-packages/matplotlib/figure.py in draw(self, renderer)
393
394 # render the axes
--> 395 for a in self.axes: a.draw(renderer)
396
397 # render the figure text
/usr/lib/python2.4/site-packages/matplotlib/axes.py in draw(self, renderer)
1358
1359 for zorder, i, a in dsu:
-> 1360 a.draw(renderer)
1361
1362 self.title.draw(renderer)
/usr/lib/python2.4/site-packages/matplotlib/text.py in draw(self, renderer)
315
316 return
--> 317 bbox, info = self._get_layout(renderer)
318
319 for line, wh, x, y in info:
/usr/lib/python2.4/site-packages/matplotlib/text.py in _get_layout(self,
renderer)
162 whs = []
163 for line in lines:
--> 164 w,h = renderer.get_text_width_height(
165 line, self._fontproperties,
ismath=self.is_math_text())
166 if not len(line) and not self.is_math_text():
/usr/lib/python2.4/site-packages/matplotlib/backends/backend_ps.py in
get_text_width_height(self, s, prop, ismath)
191 if ismath: s = s[1:-1]
192 font = self._get_font_afm(prop)
--> 193 l,b,w,h = font.get_str_bbox(s)
194
195 fontsize = prop.get_size_in_points()
/usr/lib/python2.4/site-packages/matplotlib/afm.py in get_str_bbox(self, s)
315 for c in s:
316 if c == '\n': continue
--> 317 wx, name, bbox = self._metrics[ord(c)]
318 l,b,w,h = bbox
319 if l<left: left = l
KeyError: 295
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