SF.net SVN: matplotlib:[6419] trunk/toolkits/basemap

[<js...@us...>]

Revision: 6419
          http://matplotlib.svn.sourceforge.net/matplotlib/?rev=6419&view=rev
Author:   jswhit
Date:     2008-11-20 13:08:44 +0000 (Thu, 20 Nov 2008)

Log Message:
-----------
example showing how to re-use a map background.

Modified Paths:
--------------
    trunk/toolkits/basemap/MANIFEST.in
    trunk/toolkits/basemap/examples/README

Added Paths:
-----------
    trunk/toolkits/basemap/examples/save_background.py

Modified: trunk/toolkits/basemap/MANIFEST.in
===================================================================
--- trunk/toolkits/basemap/MANIFEST.in	2008-11-20 12:27:42 UTC (rev 6418)
+++ trunk/toolkits/basemap/MANIFEST.in	2008-11-20 13:08:44 UTC (rev 6419)
@@ -11,6 +11,7 @@
 include setup.cfg
 include setupegg.py
 include src/*
+include examples/save_background.py
 include examples/embedding_map_in_wx.py
 include examples/cubed_sphere.py
 include examples/simpletest.py

Modified: trunk/toolkits/basemap/examples/README
===================================================================
--- trunk/toolkits/basemap/examples/README	2008-11-20 12:27:42 UTC (rev 6418)
+++ trunk/toolkits/basemap/examples/README	2008-11-20 13:08:44 UTC (rev 6419)
@@ -120,3 +120,6 @@
 
 embedding_map_in_wx.py is an example of how to embed Basemap using wx or wxagg
 in a GUI application.
+
+save_background.py shows how to save a map background and reuse it in another
+figure (without having to redraw coastlines).

Added: trunk/toolkits/basemap/examples/save_background.py
===================================================================
--- trunk/toolkits/basemap/examples/save_background.py	                        (rev 0)
+++ trunk/toolkits/basemap/examples/save_background.py	2008-11-20 13:08:44 UTC (rev 6419)
@@ -0,0 +1,36 @@
+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)
+
+print 'images saved in figure1.png and figure2.png'


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