SF.net SVN: matplotlib:[5827] trunk/matplotlib/examples/pylab_examples/ barb_demo.py

[<ry...@us...>]

Revision: 5827
          http://matplotlib.svn.sourceforge.net/matplotlib/?rev=5827&view=rev
Author:   ryanmay
Date:     2008-07-24 02:28:20 +0000 (Thu, 24 Jul 2008)

Log Message:
-----------
Update barb_demo.py to exercise more of the possible parameters for wind barb plots. Replace some confusing code for passing in the data with more explicit arrays.  Also, make the data array for the arbitrary grid non-square so that proper dimensioning can be seen.  Remove mysterious windows-styles line endings.

Modified Paths:
--------------
    trunk/matplotlib/examples/pylab_examples/barb_demo.py

Modified: trunk/matplotlib/examples/pylab_examples/barb_demo.py
===================================================================
--- trunk/matplotlib/examples/pylab_examples/barb_demo.py	2008-07-24 02:02:01 UTC (rev 5826)
+++ trunk/matplotlib/examples/pylab_examples/barb_demo.py	2008-07-24 02:28:20 UTC (rev 5827)
@@ -3,31 +3,39 @@
 '''
 import matplotlib.pyplot as plt
 import numpy as np
-
-x = np.linspace(-5, 5, 5)
-X,Y = np.meshgrid(x, x)
-U, V = 12*X, 12*Y
-
-data = [(-1.5,.5,-6,-6),
-        (1,-1,-46,46),
-        (-3,-1,11,-11),
-        (1,1.5,80,80)]
-
-#Default parameters for arbitrary set of vectors
-ax = plt.subplot(2,2,1)
-ax.barbs(*zip(*data))
-
-#Default parameters, uniform grid
-ax = plt.subplot(2,2,2)
-ax.barbs(X, Y, U, V)
-
-#Change parameters for arbitrary set of vectors
-ax = plt.subplot(2,2,3)
-ax.barbs(flagcolor='r', barbcolor=['b','g'], barb_increments=dict(half=10,
-    full=20, flag=100), *zip(*data))
-
-#Showing colormapping with uniform grid. 
-ax = plt.subplot(2,2,4)
-ax.barbs(X, Y, U, V, np.sqrt(U*U + V*V), fill_empty=True, rounding=False)
 
+x = np.linspace(-5, 5, 5)
+X,Y = np.meshgrid(x, x)
+U, V = 12*X, 12*Y
+
+data = [(-1.5, .5, -6, -6),
+        (1, -1, -46, 46),
+        (-3, -1, 11, -11),
+        (1, 1.5, 80, 80),
+        (0.5, 0.25, 25, 15),
+        (-1.5, -0.5, -5, 40)]
+
+data = np.array(data, dtype=[('x', np.float32), ('y', np.float32),
+    ('u', np.float32), ('v', np.float32)])
+
+#Default parameters, uniform grid
+ax = plt.subplot(2,2,1)
+ax.barbs(X, Y, U, V)
+
+#Arbitrary set of vectors, make them longer and change the pivot point
+#(point around which they're rotated) to be the middle
+ax = plt.subplot(2,2,2)
+ax.barbs(data['x'], data['y'], data['u'], data['v'], length=8, pivot='middle')
+
+#Showing colormapping with uniform grid.  Fill the circle for an empty barb,
+#don't round the values, and change some of the size parameters 
+ax = plt.subplot(2,2,3)
+ax.barbs(X, Y, U, V, np.sqrt(U*U + V*V), fill_empty=True, rounding=False,
+    sizes=dict(emptybarb=0.25, spacing=0.2, height=0.3))
+
+#Change colors as well as the increments for parts of the barbs
+ax = plt.subplot(2,2,4)
+ax.barbs(data['x'], data['y'], data['u'], data['v'], flagcolor='r',
+    barbcolor=['b','g'], barb_increments=dict(half=10, full=20, flag=100))
+
 plt.show()


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