Happy New Year to you as well!
I see now where part of the confusion lies -- even though you have
specified the WxAgg backend, the Wx backend is being used for the
printing. Though I didn't write this code, I assume this is by design
-- WxAgg can only generate bitmaps, and we don't want to use those for
printing. Unfortunately, Wx (non-Agg) has some limitations, as you've
discovered. (For a list of the limitations, see
http://matplotlib.sourceforge.net/backends.html). Given all those
shortcomings, you may be better off generating a Postscript file and
then send that to lpr. That should work on most modern Linux
distributions even without a Postscript printer. You can do:
savefig("foo.ps")
to use the matplotlib built-in Postscript backend.
As for your other questions -->
1. You cannot set orientation to LANDSCAPE, it seems "SetOrientation"
does not work.
2. When you set LANDSCAPE manually, only lower half part will be
printed.
I can't reproduce this. Your included example seems to produce correct
LANDSCAPE pages for me. These are my relevant versions -- what are yours?
wxPython: 2.8.6.1
gtk+: 2.10.9
RHEL4
3. Printing quality is far much worse than Windows's printing.
I can confirm that the Postscript generated by Wx is storing a bitmap,
and not vector data. This is probably the source of the quality loss.
I can't quite figure out why this is happening, but I have experienced
similar problems with another Wx project. Perhaps that's an inherent
limitation of Wx printing? In any case, it's a little bit below the
level of matplotlib, so perhaps a question on the wxPython mailing list
would help...
But my suggested workaround -- generating a Postscript file using
matplotlib's built-in Postscript support, instead of the Wx printing
framework -- and then printing that may be a better option for you.
Cheers,
Mike
Johann Cohen-Tanugi wrote:
> hi Mike,
> no it is WxAgg, the code is here:
> -----
> import wx
> import os
> import matplotlib
> matplotlib.use('WxAgg')
> from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as
> FigCanvas
> from matplotlib.figure import Figure
> import matplotlib.numerix as numpy
>
> class PlotFrame(wx.Frame):
> def __init__(self):
> wx.Frame.__init__(self, None, -1, "Test Printing with WX Backend")
> self.fig = Figure(None, 100)
> self.canvas= FigCanvas(self, -1, self.fig)
> self.axes = self.fig.add_axes([0.15,0.15,0.75,0.75])
> sizer = wx.BoxSizer(wx.VERTICAL)
> sizer.Add(self.canvas, 1, wx.LEFT|wx.TOP|wx.GROW)
> self.Fit()
> self.Plot_Data()
>
> def Print_Data(self):
> self.canvas.printerData.SetPaperId(wx.PAPER_A4)
> self.canvas.printerData.SetOrientation(wx.LANDSCAPE)
> dpi = self.canvas.figure.dpi.get()
> self.canvas.figure.dpi.set(200)
> self.canvas.Printer_Print()
> self.canvas.figure.dpi.set(dpi)
> self.canvas.draw()
>
> def Plot_Data(self):
> t = numpy.arange(0.0,5.0,0.01)
> s = numpy.sin(2.0*numpy.pi*t)
> c = numpy.cos(0.4*numpy.pi*t)
> self.axes.plot(t,s)
> self.axes.plot(t,c)
>
> if __name__ == '__main__':
> app = wx.PySimpleApp()
> fig = PlotFrame()
> fig.Show(True)
> fig.Print_Data()
> app.MainLoop()
> ---------------------
>
> But you got a point with usetex : I set it to False and then no more
> traceback, though the preview indicates that LANDSCAPE mode was not
> applied.
> So : WxAgg seems to have issues with usetex=True, and LANDSCAPE request
> does not seem to be honored... I am using svn revision 4797.
>
> best, and happy New Year!
> Johann
>
> Michael Droettboom wrote:
>> From the traceback, it looks as if you are using the Wx backend, not
>> the WxAgg backend, and you are using "usetex" (text rendering using
>> (La)TeX). The Wx backend does not support usetex -- the WxAgg backend
>> does. Check your matplotlibrc or your matplotlib.use command and make
>> sure you're selecting the WxAgg backend.
>>
>> Cheers,
>> Mike
>>
--
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA
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