adjust order of legend using matplotlib.pyplot

draw.py

import pandas as pd
import numpy as np
import matplotlib.pyplot as plt

fig, ax = plt.subplots()

data_list = []
w_list = [3,4,2,1,5]
for i in w_list:
    x = [x for x in range(0,100,10)]
    y = [i*x for x in range(0, 100, 10)]
    data_list.append((x,y))


# plot results in a given order
mapping_order = {"w0":0, "w1":1, "w2":2, "w3":3, "w4":4, "w5":5, "w6":6}
marker = ['-,', '-o', '-^', '-v', '-s', '-p', '-*', '-h', '-+', '-x', '-1', '-2', '-3', '-4']
colors = ['b', 'g', 'r', 'c', 'orangered', 'rosybrown', 'black', 'crimson', 'navy', 'chocolate', 'maroon']


for i in range(len(data_list)):
    x,y = data_list[i]
    tmp = {mapping_order[x]:x for x in mapping_order}
    file_name = 'w'+str(w_list[i])
    order = -1
    '''
    注释处理根据读入数据的文件名排序画图顺序的情况
    '''
    for item in mapping_order:
        if item[1] == str(w_list[i]):
            order = mapping_order[item]
            break
   
    marker_control = marker[order]
    color_control = colors[order]
    ax.plot(x, y, marker_control,c=color_control, label=file_name, linewidth=1, ms=8)
    # plt.plot(range(1, 319, 10), X[i][0::10], c=colors[i], marker=marker[i], label=file_names[i], ls='--', lw=1, ms=5)

'''
调整legend中的顺序
下面是假设legend中的顺序是乱序的，需要调整为mapping order的顺序
'''
handles, labels = ax.get_legend_handles_labels()
sorted_handles, sorted_labels = [0]*len(mapping_order), [0]*len(mapping_order)
for i in range(len(labels)):
    order = -1
    for item in mapping_order:
        if item == labels[i][:len(item)]:
            order = mapping_order[item]
            break
    sorted_labels[order] = labels[i]
    sorted_handles[order] = handles[i]
'''
下面是假设mapping order比现有的data_list长
即有一些mapping order里的东西没有用到，所以需要删除一下0
'''
res_labels = []
for item in sorted_labels:
    if item != 0:
        res_labels.append(item)
res_handles = []
for item in sorted_handles:
    if item != 0:
        res_handles.append(item)
ax.legend(res_handles, res_labels)
# ax.legend()
plt.tight_layout()
plt.show()

In order to avoid font type "type 3", add this script.

import matplotlib
matplotlib.rcParams['pdf.fonttype'] = 42
matplotlib.rcParams['ps.fonttype'] = 42

In order to use font "Times New Roman", add this script.

import matplotlib.pyplot as plt
plt.rcParams["font.family"] = "Times New Roman"
import seaborn as sns
sns.set_style({'font.family': 'Times New Roman'})

import matplotlib.pyplot as plt
import seaborn as sns
import matplotlib
matplotlib.rcParams['pdf.fonttype'] = 42
matplotlib.rcParams['ps.fonttype'] = 42
plt.rcParams["font.family"] = "Times New Roman"
import pandas as pd
import numpy as np

num_bar = 6 #同种柱子的数量

Framework = ['IV4Rec+(UI)' if i%2==0 else 'IV4Rec+(I)'  for i in range(2*num_bar)]
Ablation_part = ['w/o causal','w/o non-causal','w/o user','w/o item','w/o adaptive fusion','IV4Rec+']
Models = []
for item in Ablation_part:
    Models.append(item)
    Models.append(item)


data_list = [
        {
        "AUC":[0.5988,0.6081,0.6178,0.6230,0.6212,0.6275],
        "MRR":[0.4848,0.4884,0.4932,0.5005,0.5014,0.5051],
        "N":[i for i in range(6)],
        'name':'IV4DIN+(UI)'
        },

        {
        "AUC":[0.6087,0.6203,0.6178,0.6266,0.6255,0.6269],
        "MRR":[0.4893,0.4999,0.4932,0.4995,0.4972,0.5092],
        "N":[i for i in range(6)],
        "name":"IV4DIN+(I)"
        }
    ]

AUC = []
for i in range(6):
    AUC.append(data_list[0]['AUC'][i])
    AUC.append(data_list[1]['AUC'][i])
print(AUC)
a = pd.DataFrame({"AUC":AUC,
    'Framework':Framework,
    "Models":Models
    }
)

bottom = 0.6163 #画图的起始点


sns.set_style({'font.family': 'Times New Roman'})
font_size = 17
sns.set(font_scale = 1.5)
sns.set_style('whitegrid')
plt.xticks(fontsize = font_size)

# hatches = ["/", "/", "o","o", "*", "*","\\","\\",'+','+']
hatches = ["/"]*num_bar + ['.']*num_bar
bar_plot = sns.barplot(x ='Framework',y='AUC',data=a, hue='Models', linewidth=3, palette='Paired')

start_y2 = 0.5950
end_y2 = 0.6290
bar_plot.set_ylim([start_y2, end_y2])
bar_plot.set_yticks(np.arange(start_y2, end_y2, 0.005))
bar_plot.set_ylabel("AUC")

bar_plot.axhline(y=bottom, color='cyan', linestyle= (0, (5, 1)),label='DIN')
bar_plot.set(xlabel=None) # turn off x label
for i, patch in enumerate(bar_plot.patches):
    patch.set_hatch(hatches[i])
    # if i < num_bar:
    #     patch.set_facecolor('#abdda4')
    # else:
    #     patch.set_facecolor('#2b83ba')  

# plt.legend(loc='best',title='Treatment')
plt.legend(loc='upper center',bbox_to_anchor=(0.5,1.9), borderaxespad=0.5)
plt.savefig('recombing.pdf',format='pdf',bbox_inches = 'tight')