How to change the color palette for stackplot, matplotlib?

Question

I hope to change the color palette for stackplot so that the large area has a light color, the smaller area has a bright color.

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
import seaborn as sns
from scipy.stats import norm
import matplotlib as mpl
import matplotlib.font_manager as font_manager

file = r'E:\FD\Barren_Mudflat\ChinaCoastal\Provinces\0ProvinceStat.csv'
#set font property of legend
font1 = {'family' : 'Times New Roman',  
'weight' : 'normal',  
'size'   : 16
} 

#read csv
dat1 = pd.read_csv(file)
dat2 = dat1.iloc[:,0:12]
Year = dat2.iloc[:,0]
Mud = dat2.iloc[:,1:12]
Mud = Mud/1000.0

#read columns of dataframe
vol = Mud.columns

#transpose mud
mud2 = Mud.T


%matplotlib qt5

#set size of figure
fig, ax = plt.subplots()
fig.set_size_inches(15, 7.5)

#read values of dataframe
value = mud2.values
#plot stack area
sp = ax.stackplot(Year, value)
#set legend
proxy = [mpl.patches.Rectangle((0,0), 0,0, facecolor=pol.get_facecolor()[0]) 
for pol in sp]
ax.legend(proxy, vol,prop = font1, loc='upper left', bbox_to_anchor= 
(0.01,1), ncol = 6)

plt.xlim(1986,2016)
plt.xticks([1986,1991,1996,2001,2006,2011,2016],fontproperties='Times New 
Roman', size = '16')
plt.xlabel('Year',fontproperties='Times New Roman', size = '18')
plt.ylim(0,1400)
plt.yticks(np.arange(0,1500,200),fontproperties='Times New Roman', size = 
'16')
plt.ylabel('Mudflat area (thousand ha)',fontproperties='Times New Roman', 
size = '18')

#save fig: run this code before show()
plt.savefig(r"E:\FD\Barren_Mudflat\ChinaCoastal\Provinces\stackplot.jpg", 
dpi = 600)
plt.show()

This is the result of the code. I hope to change the red into a light color, but I don't know how to change the default color pallete.

user1455613 · Accepted Answer · 2018-12-17 10:01:44Z

6

For anyone like me finding this thread somewhat later than creation.

It is possible to set custom colors by HEX color codes.

E.g.

color_map = ["#9b59b6", "#e74c3c", "#34495e", "#2ecc71"]

Then plot:

ax.stackplot(x, y, colors = color_map)

As a last note it is also possible to convert RGB colors to HEX colors (which I had to do in my case). As follows:

rgb_code = [128, 128, 128]
hex_color = '#%02x%02x%02x' % (rgb_code[0], rgb_code[1], rgb_code[2])

answered Dec 17, 2018 at 10:01

user1455613

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Comments

Xinxin · Accepted Answer · 2018-05-18 06:45:27Z

4

col = sns.color_palette("hls", 11)
sp = ax.stackplot(Year, value, colors = col)

answered May 18, 2018 at 6:45

Xinxin

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CreekGeek · Accepted Answer · 2019-09-15 19:53:45Z

2

If wanting a more graded look, can also set proportionately from a color ramp

# user to specify
source = stack_lst # list of units to be stacked
pct_max = 95 # for example, max percentile of color ramp
pct_min = 20 # for example, min percentile of color ramp
ramp = plt.cm.viridis # for example

# number of items in data source
n = len(source)

# list of values between 0.00 and 1.00; length equals length of data source
n_prop = list(i / 100.0 for i in (np.arange(pct_min, pct_max, (pct_max-pct_min)/n)))

# create list of colors
clr_lst = []
for i in n_prop:
    clr = ramp(i) 
    clr_lst.append(clr)

then,

ax.stackplot(x, y, colors = clr_lst)

edited Sep 15, 2019 at 19:53

answered Sep 14, 2019 at 23:44

CreekGeek

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Comments

Hunaphu · Accepted Answer · 2023-10-19 01:32:04Z

0

col = matplotlib.cm.Blues(np.linspace(0.5, 1, len(df.columns)))
plt.stackplot(df.index, *df.T.values, labels = df.columns, colors = col)

answered Oct 19, 2023 at 1:32

Hunaphu

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