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`
本文介绍了Matplotlib-在"colorbar"中拾取与一种值相关的一种颜色的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
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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