thermatext/thermatext.py

#!/usr/bin/env python3
import os
import sys
from PIL import Image, ImageDraw, ImageFont
import textwrap

MAX_FONT_SIZE = 15  # Maximum font size
WORD_SPACING = 10  # Word spacing in pixels
SIDE_SPACING = 3  # Space from image sides in pixels
TOP_BOTTOM_SPACING = 10  # Space from top and bottom of image in pixels

def calculate_font_size(text, image_size, font_path):
    # Create a dummy image to get the text size
    dummy_img = Image.new('RGB', (1, 1))
    draw = ImageDraw.Draw(dummy_img)
    # Start from a large font size
    font_size = 200
    font = ImageFont.truetype(font_path, font_size)
    # Decrease the font size until the text fits the image width
    while draw.textbbox((0, 0), text, font)[2] > image_size[0] - 2 * SIDE_SPACING:
        font_size -= 1
        font = ImageFont.truetype(font_path, font_size)
    return font_size

def split_text(text, max_font_size, image_size, font_path):
    # Wrap the text based on word spacing and /n
    wrapper = WordSpacingTextWrapper(width=image_size[0], word_spacing=WORD_SPACING)
    wrapped_text = []
    for line in text.split('\n'):
        lines = wrapper.wrap(line)
        wrapped_text.extend(lines)
    return wrapped_text

class WordSpacingTextWrapper(textwrap.TextWrapper):
    def __init__(self, word_spacing=0, **kwargs):
        super().__init__(**kwargs)
        self.word_spacing = word_spacing

    def _wrap_chunks(self, chunks):
        # Add word spacing between chunks
        chunks = super()._wrap_chunks(chunks)
        lines = []
        for i, line in enumerate(chunks):
            if i < len(chunks) - 1:
                line += ' ' * self.word_spacing
            lines.append(line)
        return lines

def main(text, debug=False):
    image_width = 200
    image_height = image_width // 4
    image_size = (image_width, image_height)
    font_path = "/home/devdesk/.local/share/fonts/5x5_pixel.ttf"

    text_for_filename = text.replace(' ', '_').replace('/', '_').replace('\n', '')
    filename = f"labels/{text_for_filename}.png"


    font_size = calculate_font_size(text, image_size, font_path)

    # Split the text into multiple lines if the font size is less than 20
    if font_size < 20:
        lines = split_text(text, 20, image_size, font_path)
        # Recalculate the font size and image height with the split text
        font_size = calculate_font_size('\n'.join(lines), image_size, font_path)
        num_lines = len(lines)
        line_height = font_size
        line_spacing = line_height // 2  # Adjust line spacing as needed
        image_height = line_height * num_lines + 2 * TOP_BOTTOM_SPACING + (num_lines - 1) * line_spacing
        image_size = (image_width, image_height)

    else:
        lines = [text]
        num_lines = 1
        line_height = font_size
        line_spacing = line_height // 2  # Adjust line spacing as needed
        image_height = line_height + 2 * TOP_BOTTOM_SPACING

    # Create the image
    img = Image.new('RGB', image_size, color='white')
    d = ImageDraw.Draw(img)
    font = ImageFont.truetype(font_path, font_size)

    # Draw the text for each line
    y = TOP_BOTTOM_SPACING
    for line in lines:
        words = line.split(' ')
        word_widths = [d.textbbox((0, 0), word, font)[2] - d.textbbox((0, 0), word, font)[0] for word in words]
        total_width = sum(word_widths) + (WORD_SPACING * (len(words) - 1))
        x = (image_width - total_width) // 2 + SIDE_SPACING
        for i, word in enumerate(words):
            d.text((x, y), word, fill='black', font=font)
            x += word_widths[i] + WORD_SPACING
        y += line_height + line_spacing

    img.save(filename)

    print(f"PNG file created: {filename}")

    if not debug:
        os.system(
            f'sudo brother_ql -b pyusb --model QL-570 -p usb://0x04f9:0x2028/000M6Z401370 --debug  print -l 62 {filename}'
        )

if __name__ == "__main__":
    if len(sys.argv) < 2:
        print("Usage: ./text_to_image.py <text_string> [debug]")
        sys.exit(1)

    text = sys.argv[1].replace('\\n', '\n')  # Add this line
    debug = sys.argv[2] == 'debug' if len(sys.argv) > 2 else False

    main(text, debug)