Hi All,
I’m new to the list, and have hit a snag that I can’t find an answer for in the Cookbook or Gallery. Basically, I would like to define a color bar that is valid for a range of 0 - 10, but only display the range that is being mapped, say 5 - 7.
Is this possible?
Below is the code that I’m using.
Thanks,
Roger
···
#! /usr/bin/python
‘’’
Make a colorbar as a separate figure.
‘’’
import matplotlib
from matplotlib import pyplot, mpl
Make a figure and axes with dimensions as desired.
fig = pyplot.figure(figsize=(5,2))
ax1 = fig.add_axes([0.05, 0.65, 0.9, 0.15])
SETUP A CUSTOM COLOR RAMP
HYDRO SAMPLE COLOR RAMP
cdict = {‘blue’: [[0.0, 0.25098039215686274, 0.25098039215686274],
[0.10000000000000001, 1.0, 1.0],
[0.20000000000000001, 1.0, 1.0],
[0.29999999999999999, 1.0, 1.0],
[0.40000000000000002, 0.75294117647058822, 0.75294117647058822],
[0.5, 0.25098039215686274, 0.25098039215686274],
[0.59999999999999998, 0.25098039215686274, 0.25098039215686274],
[0.69999999999999996, 0.25098039215686274, 0.25098039215686274],
[0.80000000000000004, 0.25098039215686274, 0.25098039215686274],
[0.90000000000000002, 1.0, 1.0],
[1.0, 0.88235294117647056, 0.88235294117647056]],
‘green’: [[0.0, 0.0, 0.0],
[0.10000000000000001, 0.25098039215686274, 0.25098039215686274],
[0.20000000000000001, 0.62745098039215685, 0.62745098039215685],
[0.29999999999999999, 0.8784313725490196, 0.8784313725490196],
[0.40000000000000002, 1.0, 1.0],
[0.5, 1.0, 1.0],
[0.59999999999999998, 1.0, 1.0],
[0.69999999999999996, 0.62745098039215685, 0.62745098039215685],
[0.80000000000000004, 0.12549019607843137, 0.12549019607843137],
[0.90000000000000002, 0.62745098039215685, 0.62745098039215685],
[1.0, 0.8784313725490196, 0.8784313725490196]],
‘red’: [[0.0, 0.25098039215686274, 0.25098039215686274],
[0.10000000000000001, 0.0, 0.0],
[0.20000000000000001, 0.0, 0.0],
[0.29999999999999999, 0.25098039215686274, 0.25098039215686274],
[0.40000000000000002, 0.25098039215686274, 0.25098039215686274],
[0.5, 0.50196078431372548, 0.50196078431372548],
[0.59999999999999998, 1.0, 1.0],
[0.69999999999999996, 1.0, 1.0],
[0.80000000000000004, 1.0, 1.0],
[0.90000000000000002, 1.0, 1.0], [1.0, 1.0, 1.0]]}
cmap = matplotlib.colors.LinearSegmentedColormap(‘my_colormap’,cdict,256)
Set the colormap and norm to correspond to the data for which
the colorbar will be used.
#cmap = mpl.cm.cool
norm = mpl.colors.Normalize(vmin=5, vmax=10)
cb1 = mpl.colorbar.ColorbarBase(ax1,
cmap=cmap,
norm=norm,
orientation=‘horizontal’)
cb1.set_label(‘Some Units’)
pyplot.show()