added gradient bar example

jdh2358 · jdh2358 · commit e3708582328c · 2007-09-20T13:50:27.000Z
svn path=/trunk/matplotlib/; revision=3863
diff --git a/examples/gradient_bar.py b/examples/gradient_bar.py
@@ -0,0 +1,26 @@
+from pylab import figure, show, nx, cm
+
+def gbar(ax, x, y, width=0.5, bottom=0):
+   X = [[.6, .6],[.7,.7]]
+   for left,top in zip(x, y):
+       right = left+width
+       ax.imshow(X, interpolation='bicubic', cmap=cm.Blues,
+                 extent=(left, right, bottom, top), alpha=1)
+
+fig = figure()
+
+xmin, xmax = xlim = 0,10
+ymin, ymax = ylim = 0,1
+ax = fig.add_subplot(111, xlim=xlim, ylim=ylim,
+                    autoscale_on=False)
+X = [[.6, .6],[.7,.7]]
+
+ax.imshow(X, interpolation='bicubic', cmap=cm.copper,
+         extent=(xmin, xmax, ymin, ymax), alpha=1)
+
+N = 10
+x = nx.arange(N)+0.25
+y = nx.mlab.rand(N)
+gbar(ax, x, y, width=0.7)
+ax.set_aspect('normal')
+show()
