Matplotlib-在"colorbar"中拾取与一种值相关的一种颜色 [英] Matplotlib - Pick up one color associated to one value in a `colorbar`

问题描述

我想绘制与某些值(X_i)相关的矩形.每个矩形都将具有填充颜色，具体取决于其值 X_i .

I would like to draw rectangles associated to some values (X_i). Each of this rectangles will have a fill color depending to its value value X_i.

是否可以使用一个 colorbar 并知道哪种颜色与一个值相关联?

Is-it possible to use one colorbar and also to know which color is associated to one value ?

推荐答案

from matplotlib.pylab import *
import matplotlib.cm as cm
import matplotlib.patches as patches

min_val = 0
max_val = 50

my_cmap = cm.get_cmap('jet') # or any other one
norm = matplotlib.colors.Normalize(min_val, max_val) # the color maps work for [0, 1]

x_i = 15
color_i = my_cmap(norm(x_i)) # returns an rgba value

rect = patches.Rectangle((.5, .5), .25, .25, color=color_i) # make your rectangle

cmmapable = cm.ScalarMappable(norm, my_cmap)
cmmapable.set_array(range(min_val, max_val))

figure()
ax = gca()
ax.add_patch(rect)
colorbar(cmmapable)
show()

还会在图形上显示一个颜色条.

Will also get you a color bar on your graph.

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