Question

我希望更改stackplot的调色板，使大区域的颜色浅，较小的区域颜色鲜艳。

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()

这是代码的结果。我希望将红色变成浅色，但我不知道如何更改默认颜色托盘。

Answer 1

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

Answer 2

对于像我这样的人，创建线程的时间要晚于创建时间。

可以通过十六进制颜色代码设置自定义颜色。

例如

#include <stdio.h>
#include <stdlib.h>
typedef unsigned char uint8_t;
typedef unsigned short uint16_t;

static const uint16_t crcTable1021[256u] = {
  0x0000u, 0x17CEu, 0x0FDFu, 0x1811u, 0x1FBEu, 0x0870u, 0x1061u, 0x07AFu,
  0x1F3Fu, 0x08F1u, 0x10E0u, 0x072Eu, 0x0081u, 0x174Fu, 0x0F5Eu, 0x1890u,
  0x1E3Du, 0x09F3u, 0x11E2u, 0x062Cu, 0x0183u, 0x164Du, 0x0E5Cu, 0x1992u,
  0x0102u, 0x16CCu, 0x0EDDu, 0x1913u, 0x1EBCu, 0x0972u, 0x1163u, 0x06ADu,
  0x1C39u, 0x0BF7u, 0x13E6u, 0x0428u, 0x0387u, 0x1449u, 0x0C58u, 0x1B96u,
  0x0306u, 0x14C8u, 0x0CD9u, 0x1B17u, 0x1CB8u, 0x0B76u, 0x1367u, 0x04A9u,
  0x0204u, 0x15CAu, 0x0DDBu, 0x1A15u, 0x1DBAu, 0x0A74u, 0x1265u, 0x05ABu,
  0x1D3Bu, 0x0AF5u, 0x12E4u, 0x052Au, 0x0285u, 0x154Bu, 0x0D5Au, 0x1A94u,
  0x1831u, 0x0FFFu, 0x17EEu, 0x0020u, 0x078Fu, 0x1041u, 0x0850u, 0x1F9Eu,
  0x070Eu, 0x10C0u, 0x08D1u, 0x1F1Fu, 0x18B0u, 0x0F7Eu, 0x176Fu, 0x00A1u,
  0x060Cu, 0x11C2u, 0x09D3u, 0x1E1Du, 0x19B2u, 0x0E7Cu, 0x166Du, 0x01A3u,
  0x1933u, 0x0EFDu, 0x16ECu, 0x0122u, 0x068Du, 0x1143u, 0x0952u, 0x1E9Cu,
  0x0408u, 0x13C6u, 0x0BD7u, 0x1C19u, 0x1BB6u, 0x0C78u, 0x1469u, 0x03A7u,
  0x1B37u, 0x0CF9u, 0x14E8u, 0x0326u, 0x0489u, 0x1347u, 0x0B56u, 0x1C98u,
  0x1A35u, 0x0DFBu, 0x15EAu, 0x0224u, 0x058Bu, 0x1245u, 0x0A54u, 0x1D9Au,
  0x050Au, 0x12C4u, 0x0AD5u, 0x1D1Bu, 0x1AB4u, 0x0D7Au, 0x156Bu, 0x02A5u,
  0x1021u, 0x07EFu, 0x1FFEu, 0x0830u, 0x0F9Fu, 0x1851u, 0x0040u, 0x178Eu,
  0x0F1Eu, 0x18D0u, 0x00C1u, 0x170Fu, 0x10A0u, 0x076Eu, 0x1F7Fu, 0x08B1u,
  0x0E1Cu, 0x19D2u, 0x01C3u, 0x160Du, 0x11A2u, 0x066Cu, 0x1E7Du, 0x09B3u,
  0x1123u, 0x06EDu, 0x1EFCu, 0x0932u, 0x0E9Du, 0x1953u, 0x0142u, 0x168Cu,
  0x0C18u, 0x1BD6u, 0x03C7u, 0x1409u, 0x13A6u, 0x0468u, 0x1C79u, 0x0BB7u,
  0x1327u, 0x04E9u, 0x1CF8u, 0x0B36u, 0x0C99u, 0x1B57u, 0x0346u, 0x1488u,
  0x1225u, 0x05EBu, 0x1DFAu, 0x0A34u, 0x0D9Bu, 0x1A55u, 0x0244u, 0x158Au,
  0x0D1Au, 0x1AD4u, 0x02C5u, 0x150Bu, 0x12A4u, 0x056Au, 0x1D7Bu, 0x0AB5u,
  0x0810u, 0x1FDEu, 0x07CFu, 0x1001u, 0x17AEu, 0x0060u, 0x1871u, 0x0FBFu,
  0x172Fu, 0x00E1u, 0x18F0u, 0x0F3Eu, 0x0891u, 0x1F5Fu, 0x074Eu, 0x1080u,
  0x162Du, 0x01E3u, 0x19F2u, 0x0E3Cu, 0x0993u, 0x1E5Du, 0x064Cu, 0x1182u,
  0x0912u, 0x1EDCu, 0x06CDu, 0x1103u, 0x16ACu, 0x0162u, 0x1973u, 0x0EBDu,
  0x1429u, 0x03E7u, 0x1BF6u, 0x0C38u, 0x0B97u, 0x1C59u, 0x0448u, 0x1386u,
  0x0B16u, 0x1CD8u, 0x04C9u, 0x1307u, 0x14A8u, 0x0366u, 0x1B77u, 0x0CB9u,
  0x0A14u, 0x1DDAu, 0x05CBu, 0x1205u, 0x15AAu, 0x0264u, 0x1A75u, 0x0DBBu,
  0x152Bu, 0x02E5u, 0x1AF4u, 0x0D3Au, 0x0A95u, 0x1D5Bu, 0x054Au, 0x1284u,
};

static const uint16_t crcTable8408[256u] = {
  0x0000u, 0x1189u, 0x2312u, 0x329Bu, 0x4624u, 0x57ADu, 0x6536u, 0x74BFu,
  0x8C48u, 0x9DC1u, 0xAF5Au, 0xBED3u, 0xCA6Cu, 0xDBE5u, 0xE97Eu, 0xF8F7u,
  0x1081u, 0x0108u, 0x3393u, 0x221Au, 0x56A5u, 0x472Cu, 0x75B7u, 0x643Eu,
  0x9CC9u, 0x8D40u, 0xBFDBu, 0xAE52u, 0xDAEDu, 0xCB64u, 0xF9FFu, 0xE876u,
  0x2102u, 0x308Bu, 0x0210u, 0x1399u, 0x6726u, 0x76AFu, 0x4434u, 0x55BDu,
  0xAD4Au, 0xBCC3u, 0x8E58u, 0x9FD1u, 0xEB6Eu, 0xFAE7u, 0xC87Cu, 0xD9F5u,
  0x3183u, 0x200Au, 0x1291u, 0x0318u, 0x77A7u, 0x662Eu, 0x54B5u, 0x453Cu,
  0xBDCBu, 0xAC42u, 0x9ED9u, 0x8F50u, 0xFBEFu, 0xEA66u, 0xD8FDu, 0xC974u,
  0x4204u, 0x538Du, 0x6116u, 0x709Fu, 0x0420u, 0x15A9u, 0x2732u, 0x36BBu,
  0xCE4Cu, 0xDFC5u, 0xED5Eu, 0xFCD7u, 0x8868u, 0x99E1u, 0xAB7Au, 0xBAF3u,
  0x5285u, 0x430Cu, 0x7197u, 0x601Eu, 0x14A1u, 0x0528u, 0x37B3u, 0x263Au,
  0xDECDu, 0xCF44u, 0xFDDFu, 0xEC56u, 0x98E9u, 0x8960u, 0xBBFBu, 0xAA72u,
  0x6306u, 0x728Fu, 0x4014u, 0x519Du, 0x2522u, 0x34ABu, 0x0630u, 0x17B9u,
  0xEF4Eu, 0xFEC7u, 0xCC5Cu, 0xDDD5u, 0xA96Au, 0xB8E3u, 0x8A78u, 0x9BF1u,
  0x7387u, 0x620Eu, 0x5095u, 0x411Cu, 0x35A3u, 0x242Au, 0x16B1u, 0x0738u,
  0xFFCFu, 0xEE46u, 0xDCDDu, 0xCD54u, 0xB9EBu, 0xA862u, 0x9AF9u, 0x8B70u,
  0x8408u, 0x9581u, 0xA71Au, 0xB693u, 0xC22Cu, 0xD3A5u, 0xE13Eu, 0xF0B7u,
  0x0840u, 0x19C9u, 0x2B52u, 0x3ADBu, 0x4E64u, 0x5FEDu, 0x6D76u, 0x7CFFu,
  0x9489u, 0x8500u, 0xB79Bu, 0xA612u, 0xD2ADu, 0xC324u, 0xF1BFu, 0xE036u,
  0x18C1u, 0x0948u, 0x3BD3u, 0x2A5Au, 0x5EE5u, 0x4F6Cu, 0x7DF7u, 0x6C7Eu,
  0xA50Au, 0xB483u, 0x8618u, 0x9791u, 0xE32Eu, 0xF2A7u, 0xC03Cu, 0xD1B5u,
  0x2942u, 0x38CBu, 0x0A50u, 0x1BD9u, 0x6F66u, 0x7EEFu, 0x4C74u, 0x5DFDu,
  0xB58Bu, 0xA402u, 0x9699u, 0x8710u, 0xF3AFu, 0xE226u, 0xD0BDu, 0xC134u,
  0x39C3u, 0x284Au, 0x1AD1u, 0x0B58u, 0x7FE7u, 0x6E6Eu, 0x5CF5u, 0x4D7Cu,
  0xC60Cu, 0xD785u, 0xE51Eu, 0xF497u, 0x8028u, 0x91A1u, 0xA33Au, 0xB2B3u,
  0x4A44u, 0x5BCDu, 0x6956u, 0x78DFu, 0x0C60u, 0x1DE9u, 0x2F72u, 0x3EFBu,
  0xD68Du, 0xC704u, 0xF59Fu, 0xE416u, 0x90A9u, 0x8120u, 0xB3BBu, 0xA232u,
  0x5AC5u, 0x4B4Cu, 0x79D7u, 0x685Eu, 0x1CE1u, 0x0D68u, 0x3FF3u, 0x2E7Au,
  0xE70Eu, 0xF687u, 0xC41Cu, 0xD595u, 0xA12Au, 0xB0A3u, 0x8238u, 0x93B1u,
  0x6B46u, 0x7ACFu, 0x4854u, 0x59DDu, 0x2D62u, 0x3CEBu, 0x0E70u, 0x1FF9u,
  0xF78Fu, 0xE606u, 0xD49Du, 0xC514u, 0xB1ABu, 0xA022u, 0x92B9u, 0x8330u,
  0x7BC7u, 0x6A4Eu, 0x58D5u, 0x495Cu, 0x3DE3u, 0x2C6Au, 0x1EF1u, 0x0F78u,
};

static uint8_t reverse(uint8_t n) {
   static uint8_t lookup[16] = {
            0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
            0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf, };
   uint8_t result;
   result = lookup[n & 0xF] << 4 | lookup[n>>4];
   return result;
}

static uint16_t reverse16(uint16_t n) {
   return reverse(n & 0xFF) << 8 | reverse(n >> 8);
}

uint16_t Calculate(const uint8_t *message, int nBytes, uint16_t wOldCRC) {
    uint8_t data;
    uint16_t remainder = wOldCRC;
    for (int byte = 0; byte < nBytes; ++byte) {
        data = message[byte] ^ remainder;
        remainder = crcTable8408[data] ^ (remainder >> 8);
    }
    return remainder;
}

uint16_t CalculateInv(const uint8_t *message, int nBytes, uint16_t wOldCRC) {
    uint8_t data;
    uint16_t remainder = wOldCRC; //already reversed in function call
    for (int byte = nBytes; byte > 0; --byte) {
        data = reverse(message[byte-1]) ^ remainder;
        remainder = crcTable1021[data] ^ (remainder << 8);
    }
    return reverse16(remainder);
}

int main(void) {
   uint16_t expected = 0x4167;
   uint8_t pattern[] = "Hello World!";

   uint16_t result = Calculate(pattern, 12, 0x6363);
   printf("CRC option 1: 0x%04x, expected 0x%04x\n", result, expected);

   result = CalculateInv(pattern, 12, 0xC6C6);
   printf("CRC option 2: 0x%04X, expected 0x%04X\n", result, expected);

   return EXIT_SUCCESS;
}

然后情节：

CRC option 1: 0x4167, expected 0x4167
CRC option 2: 0x62FD, expected 0x4167

最后一点是，也可以将RGB颜色转换为十六进制颜色（在我的情况下，我必须这样做）。如下：

uint16_t  crcTable[256];
void Init(uint16_t polynomial) {
    uint16_t  remainder;
    for (int dividend = 0; dividend < 256; ++dividend) {
        remainder = dividend;
        for (uint8_t bit = 8; bit > 0; --bit) {
            if (remainder & 1)
                remainder = (remainder >> 1) ^ polynomial;
            else
                remainder = (remainder >> 1);
        }
        crcTable[dividend] = remainder;
    }

    printf("static const uint_t crcTable[256u] = {");
    for (int i = 0; i<32; ++i) {
       printf("\n  ");
       for (int j=0; j<8; ++j) {
          printf("0x%04Xu, ",crcTable[i*8+j]);
       }
    }
    printf("\n};\n");
}

Answer 3

如果想要更渐变的外观，还可以从色带中按比例设置

# 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)

然后

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

如何更改stackplot，matplotlib的调色板？

3 个答案: