I would like to add a title to pie chart with legend at right. Currently, the title not at the center!

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

def plot(df,xname,yname,pngname):
    title = "sample title"
    x = df[xname]
    y = df[yname]
    
    fig, ax = plt.subplots(figsize=(5, 5))
    patches, texts = ax.pie(x,#autopct='%.1f%%',
                            startangle=90, radius=1.2,
        wedgeprops={'linewidth': .1, 'edgecolor': 'white'},
        textprops={'size': 'x-large'})

    labels = ['{1:1.1f} {0}'.format(i,j) for i,j in zip(y,x)]
    patches, labels, dummy=zip(*sorted(zip(patches, labels, x),
                                          key=lambda x: x[2],
                                          reverse=True))
    plt.legend(patches, labels,
               frameon=False,
               loc='center left',
               bbox_to_anchor=(1, 0.5),
               labelspacing=0,
               #handletextpad=0.1,
           fontsize=12)

    ax.set_title(title)
    plt.tight_layout()
    fig.savefig(pngname, dpi=fig.dpi, bbox_inches="tight")
    print("[[./%s]]"%pngname)
    return

df = pd.DataFrame({
    'key':  ['AAAA', 'BBBB', 'CCCC', 'DDDD'],
    'value':[ 20  ,6,   6,   8]})

plot(df,"value","key","demo.png")

How can I put the title at the center?

CodePudding user response：

You can use matplotlib.axes.Axes.text

Try adding this to your function instead of the set_title line:

ax.text(0.5, 0.5, 'sample title', transform = ax.transAxes, va = 'center', ha = 'center', backgroundcolor = 'white')

You can play around with the parameters to get what you want