Revision: 6790
http://matplotlib.svn.sourceforge.net/matplotlib/?rev=6790&view=rev
Author: jdh2358
Date: 2009-01-16 17:06:38 +0000 (Fri, 16 Jan 2009)
Log Message:
-----------
added custom colormap from list func
Modified Paths:
--------------
trunk/matplotlib/CHANGELOG
trunk/matplotlib/lib/matplotlib/colors.py
Modified: trunk/matplotlib/CHANGELOG
===================================================================
--- trunk/matplotlib/CHANGELOG 2009-01-16 16:25:28 UTC (rev 6789)
+++ trunk/matplotlib/CHANGELOG 2009-01-16 17:06:38 UTC (rev 6790)
@@ -1,3 +1,7 @@
+2009-11-16 Added helper function LinearSegmentedColormap.from_list to
+ facilitate building simple custom colomaps. See
+ examples/pylab_examples/custom_cmap_fromlist.py - JDH
+
2009-01-16 Applied Michiel's patch for macosx backend to fix rounding
bug. Closed sf bug 2508440 - JSW
Modified: trunk/matplotlib/lib/matplotlib/colors.py
===================================================================
--- trunk/matplotlib/lib/matplotlib/colors.py 2009-01-16 16:25:28 UTC (rev
6789)
+++ trunk/matplotlib/lib/matplotlib/colors.py 2009-01-16 17:06:38 UTC (rev
6790)
@@ -611,7 +611,27 @@
self._isinit = True
self._set_extremes()
+ @staticmethod
+ def from_list(name, colors, N=256):
+ """
+ Make a linear segmented colormap with *name* from a sequence
+ of *colors* which evenly transitions from colors[0] at val=1
+ to colors[-1] at val=1. N is the number of rgb quantization
+ levels.
+ """
+ ncolors = len(colors)
+ vals = np.linspace(0., 1., ncolors)
+
+ cdict = dict(red=[], green=[], blue=[])
+ for val, color in zip(vals, colors):
+ r,g,b = colorConverter.to_rgb(color)
+ cdict['red'].append((val, r, r))
+ cdict['green'].append((val, g, g))
+ cdict['blue'].append((val, b, b))
+
+ return LinearSegmentedColormap(name, cdict, N)
+
class ListedColormap(Colormap):
"""Colormap object generated from a list of colors.
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