2008/7/16 Jeff Whitaker <[EMAIL PROTECTED]>:
> 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
>
I suppose it's not up to matplotlib to work around silly limits in
Cairo :) What about the fill issue with the Agg backend when doing
zoomed in ortho maps? Am I doing something wrong?
(actually hit reply all this time)
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