Alex Stapleton wrote:
> Not sure if this is the right place to send this, can't seem to find a
> dedicated bugs list or issue tracker. Or much discussion regarding the
> basemap toolkit at all really.
>
> Trying to savefig some Basemap instances causes the following
> exception in the Cairo backend. Seems to work alright using the Agg
> backend but the fill doesn't seem to come out properly. The sea gets
> colored as well as the continents.
>
> Traceback (most recent call last):
> File "map.py", line 48, in <module>
> plt.savefig("map.png", dpi=100)
> File "/usr/lib/python2.5/site-packages/matplotlib/pyplot.py", line
> 286, in savefig
> return fig.savefig(*args, **kwargs)
> File "/usr/lib/python2.5/site-packages/matplotlib/figure.py", line
> 1033, in savefig
> self.canvas.print_figure(*args, **kwargs)
> File "/usr/lib/python2.5/site-packages/matplotlib/backend_bases.py",
> line 1301, in print_figure
> **kwargs)
> File
> "/usr/lib/python2.5/site-packages/matplotlib/backends/backend_cairo.py",
> line 406, in print_png
> self.figure.draw (renderer)
> File "/usr/lib/python2.5/site-packages/matplotlib/figure.py", line
> 833, in draw
> for a in self.axes: a.draw(renderer)
> File "/usr/lib/python2.5/site-packages/matplotlib/axes.py", line 1539, in
> draw
> a.draw(renderer)
> File "/usr/lib/python2.5/site-packages/matplotlib/patches.py", line
> 285, in draw
> renderer.draw_path(gc, tpath, affine, rgbFace)
> File
> "/usr/lib/python2.5/site-packages/matplotlib/backends/backend_cairo.py",
> line 140, in draw_path
> raise ValueError("The Cairo backend can not draw paths longer than
> 18980 points.")
> ValueError: The Cairo backend can not draw paths longer than 18980 points.
>
> Here's a short reduction
>
> import matplotlib
> matplotlib.use("Cairo")
> from mpl_toolkits.basemap import Basemap
> import matplotlib.pyplot as plt
>
> map = Basemap(projection='ortho',
> llcrnrlon=-12.7, llcrnrlat=49,
> urcrnrlon=4.7, urcrnrlat=61,
> lat_0 = 50, lon_0 = 0,
> lat_ts=50,
> resolution='i')
> map.drawcoastlines(linewidth=0.5)
> map.drawcountries(linewidth=0.5)
> map.drawstates(linewidth=0.5)
> map.drawmapboundary()
> plt.savefig("map.png", dpi=100)
>
>
Alex: I don't have the Cairo backend installed, but I bet it would work
if you changed resolution='i' to resolution='l'. Seems like a pretty
severe limitation of the backend though.
-Jeff
--
Jeffrey S. Whitaker Phone : (303)497-6313
NOAA/OAR/CDC R/PSD1 FAX : (303)497-6449
325 Broadway Boulder, CO, USA 80305-3328
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