Get image of a certain glyph from the given font

get_glyph_img.py

#!/usr/bin/env python3
# -*- encoding: utf8 -*-
import os
import numpy as np
from PIL import Image, ImageDraw, ImageFont

dirname = os.path.dirname(__file__)
shs_cn_filename = os.path.join(dirname,
    '../../data/fonts/SourceHanSansSC-ExtraLight.otf')

def get_glyph_img(character,
    pt = 1024, binarize = True, fontname = shs_cn_filename):
    """Get image of a certain glyph from the given font

    Parameters
    ----------
    character: str
        The character to draw
    pt: int
        Number of pixels horizontally and vertically
    binarize: boolean
        Return a binary image or not
    fontname: str
        The font file name
    
    Returns
    ----------
    glyph_img: numpy.ndarray
        A greyscale image of the glyph, with its foreground in white (255) and
        background in black (0). 
    """
    font = ImageFont.truetype(fontname, pt)
    descent = abs(font.getmetrics()[-1])
    img = Image.new('L', (pt, pt), 0)
    draw = ImageDraw.Draw(img)
    draw.text((0, -descent), character, 255, font = font)
    img_array = np.array(img, dtype = np.uint8)
    if not binarize: return img_array
    else: return (img_array > 128).astype(np.uint8)

# visualization
import matplotlib.pyplot as plt
fig = plt.figure()
fig.add_axes([0, 0, 1, 1])
ax = fig.axes[0]
ax.imshow(get_glyph_img('棒'), cmap = plt.cm.get_cmap('gray'))
plt.show()