Hrafnkell Pálsson wrote:
>
>
>> This will turn off the rendering of both the background rectangle as
>> well as all the ticks and their associated labels, ticklines and
>> gridlines. Perhaps Jeff can advise you vis-a-vis the basemap api what
>> the equivalent is
>>
>>
>
> Ok, I tested your example and see what you mean.
> But if I understood you correctly this won't allow me to retain the
> watermark and the dots I've used for marking cities.
> It would be nice if I could retain the whole background, if it wouldn't
> matter whether I retrieved the background or actually plotted it.
> But even just avoiding plotting the coastline every time would save a lot of
> time.
>
>
>
>
>> Perhaps Jeff can advise you vis-a-vis the basemap api what
>> the equivalent is
>>
>>
>
> Could you, Jeff, give me a nudge in the right direction? I've read through
> the basemap documentation but didn't notice anything that might help.
>
> Hrafnkell
>
Hrafnkell:
Had some time this morning, so I used John's method to create a working Basemap
example:
import matplotlib
matplotlib.use('Agg')
from mpl_toolkits.basemap import Basemap
import matplotlib.pyplot as plt
# this example shows how to save a map background and
# reuse it in another figure.
# make sure we have all the same properties on all figs
figprops = dict(figsize=(8,6), dpi=100, facecolor='white')
# generate the first figure.
fig1 = plt.figure(1,**figprops)
ax1 = fig1.add_subplot(111)
# create basemap instance, plot coastlines.
map = Basemap(projection='moll',lon_0=0)
map.drawcoastlines()
map.drawmapboundary(fill_color='aqua')
map.fillcontinents(color='coral',lake_color='aqua')
fig1.canvas.draw()
background = fig1.canvas.copy_from_bbox(fig1.bbox)
fig1.savefig('figure1.png', dpi=100)
# generate the second figure, re-using the background
# from figure 1.
fig2 = plt.figure(2,frameon=False,**figprops)
ax2 = fig2.add_subplot(111, frameon=False, xticks=[], yticks=[])
# restore previous background.
fig2.canvas.restore_region(background)
# draw parallels and meridians on existing background.
map.drawparallels(range(-90,90,30))
map.drawmeridians(range(-180,180,60))
fig2.savefig('figure2.png', dpi=100)
I've added this to the basemap examples directory as save_background.py
HTH,
-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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