I can't make much sense of this. You don't plot anything and don't use
canvas.
This code works:
import matplotlib
matplotlib.use('GTKAgg')
from matplotlib import pyplot
pyplot.plot([0, 1, 2, 3], [0, 1, 2, 3])
fig = pyplot.gcf()
fig.savefig('test.jpg')
But I don't know how to set the dpi value this way. I tried to use the
OO API but no success.
Goyo
El dom, 12-10-2008 a las 23:45 +0200, Jesper Larsen escribió:
> Hi matplotlib-users,
>
> I decided to try to make some plots that I have previously made in png
> format using the Agg backend in jpeg format using the GTKAgg backend
> (which I guess is the one I should use for this). Unfortunately my
> script exits with an error. I have therefore created a simple test
> script (test.py) that illustrates the problem (at least on my
> computer):
>
> import matplotlib
> from matplotlib.backends.backend_gtkagg import FigureCanvasGTKAgg as
> FigureCanvas
>
> fig = matplotlib.figure.Figure(dpi=100)
> canvas = FigureCanvas(fig)
> fig.savefig('test.jpg')
>
> When I run it I get:
>
> $ python test.py
> /usr/lib/python2.5/site-packages/matplotlib/backends/backend_gtk.py:357:
> GtkWarning: gtk_widget_realize: assertion `GTK_WIDGET_ANCHORED
> (widget) || GTK_IS_INVISIBLE (widget)' failed
> gtk.DrawingArea.realize(self)
> /usr/lib/python2.5/site-packages/matplotlib/backends/backend_gtk.py:360:
> GtkWarning: gdk_pixmap_new: assertion `(drawable != NULL) || (depth !=
> -1)' failed
> pixmap = gdk.Pixmap (self.window, width, height)
> Traceback (most recent call last):
> File "test.py", line 6, in <module>
> fig.savefig('test.jpg')
> File "/usr/lib/python2.5/site-packages/matplotlib/figure.py", line
> 964, in savefig
> self.canvas.print_figure(*args, **kwargs)
> File "/usr/lib/python2.5/site-packages/matplotlib/backend_bases.py",
> line 1310, in print_figure
> **kwargs)
> File "/usr/lib/python2.5/site-packages/matplotlib/backends/backend_gtk.py",
> line 347, in print_jpeg
> return self._print_image(filename, 'jpeg')
> File "/usr/lib/python2.5/site-packages/matplotlib/backends/backend_gtk.py",
> line 360, in _print_image
> pixmap = gdk.Pixmap (self.window, width, height)
> RuntimeError: could not create GdkPixmap object
>
> I am using matplotlib 0.98.3, pygtk 2.14.0. My system is a Linux Ubuntu:
>
> $ uname -a
> Linux <blanket out> #1 SMP Wed Aug 20 18:39:13 UTC 2008 i686 GNU/Linux
>
> Does anyone know what is wrong?
>
> Best regards,
> Jesper
>
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