"typing" with emojis in discord

emoji_write.py

import os
import sys
import numpy as np
from PIL import Image, ImageFont, ImageDraw, ImageEnhance
import matplotlib.pyplot as plt

# parameters
font_size = 12
threshold = 0.9
emoji = ':a_:'
emoji_width = 6
show_rendered_text = False
gradient_emoji = ':a{}:'
gradient_image = True
gradient_levels = 10
gradient_range = (0.2, 1.0)
gradient_ticks = np.linspace(gradient_range[0], gradient_range[1], gradient_levels)

if sys.platform == 'win32':
    font_path = os.path.join('C:' + os.path.sep, 'Windows', 'Fonts', 'simsun.ttc')
elif sys.platform == 'linux':
    font_path = os.path.join('usr', 'share', 'fonts', 'opentype', 'NotoSerifCJK-Regular.ttc')
else:
    raise RuntimeError('unknown platform "{}"'.format(sys.platform))

print('try to load font "{}"'.format(font_path))

image_font = ImageFont.truetype(font_path, font_size)

def generate_gradient_image(input_filename, output_format):
    image = Image.open(input_filename)
    gradient_ticks = np.linspace(gradient_range[0], gradient_range[1], gradient_levels)
    brightness = ImageEnhance.Brightness(image)
    for ind, level in enumerate(gradient_ticks):
        new_img = brightness.enhance(level)
        new_img.save(output_format.format(ind))


def emoji_write(text):
    image_size = image_font.getsize(text)
    image = Image.new('L', image_size, 255)
    draw = ImageDraw.Draw(image)
    draw.text((0, 0), text, font=image_font)
    image = np.asarray(image).astype(np.float32) / 255.0
    if show_rendered_text:
        plt.imshow(image)
        plt.show()
    lines = []
    if gradient_image:
        # invert pixel intensity
        image = 1.0 - image
        for i in range(image.shape[0]):
            line = ''
            for j in range(image.shape[1]):
                if image[i,j] > gradient_range[0]:
                    index = np.searchsorted(gradient_ticks, image[i,j])
                    line += gradient_emoji.format(index)
                else:
                    line += ' ' * emoji_width
            lines.append(line.rstrip())
    else:
        fill_region = image < threshold
        for i in range(fill_region.shape[0]):
            line = ''
            for j in range(fill_region.shape[1]):
                if fill_region[i,j]:
                    line += emoji
                else:
                    line += ' ' * emoji_width
            lines.append(line.rstrip())

    start_index = 0
    for line in lines:
        if all(map(lambda x : x == ' ', line)):
            start_index += 1
        else:
            break
    for i in range(start_index, len(lines)):
        lines[i] = '|' + lines[i]
    return '\n'.join(lines[start_index:])

#generate_gradient_image('smile.png','a{}.png')

result = emoji_write('hi')
with open('emoji.txt', 'w') as outfile:
    outfile.write(result)