shimatta_kenkyushu_label_gen/shimatta_label/label_image.py

import sys
import os
from PIL import Image, ImageDraw, ImageFont
import tempfile

class Label():
    pixels_x = 155
    pixels_y = 106
    bg_color = (255, 255, 255)

    def __init__(self, skip_create = False):
        me_path = os.path.dirname(__file__)
        self.bold_font_fname = os.path.join(me_path, 'OpenSans-Bold.ttf')
        self.regular_font_fname = os.path.join(me_path, 'OpenSans-Regular.ttf')

        if not skip_create:
            self.create()

    def create(self):
        self.img = Image.new('RGB', (self.pixels_x, self.pixels_y), color=self.bg_color)

    def draw_text(self, text : str, pos_x, pos_y, color=(0,0,0), size=10, font_file=None, centered=False, scale_to_fit=False):
        d = ImageDraw.Draw(self.img)
        if font_file is None or font_file == 'regular':
            font_file = self.regular_font_fname
        elif font_file == 'bold':
            font_file = self.bold_font_fname

        font_fits = False
        orig_size = size
        orig_pos_x = pos_x
        orig_pos_y = pos_y
        while not font_fits:
            fnt = ImageFont.truetype(font_file, size)
            w, h = d.textsize(text, font=fnt)

            if centered:
                pos_x = orig_pos_x - w / 2
                pos_y = orig_pos_y - h / 2
            else:
                pos_x = orig_pos_x
                pos_y = orig_pos_y

            if not scale_to_fit:
                font_fits = True
                break

            if pos_x >= 0 and pos_x + w <= self.pixels_x:
                font_fits = True
            else:
                size = size - 1
        if size != orig_size:
            print('Rescaled font to size:', size)

        d.text((pos_x, pos_y), text, font=fnt, fill=color)

    def save(self, fname = None):
        """
        Save Label to file. If no fname is supplied, a tempfile is created and its filename is returend
        """
        if self.img is None:
            raise Exception('Must create image first')

        if fname is None or fname == '':
            fobj = tempfile.mkstemp(suffix='.png', prefix='label_', text=False)
            with os.fdopen(fobj[0], mode="w+b") as file:
                self.img.save(file, format='PNG')
            fname = fobj[1]
        else:
            self.img.save(fname)

        return fname    
        

class MiceToiletLabel(Label):
    
    pixels_x = 155
    pixels_y = 106

    def __init__(self):
        super().__init__(skip_create=True)
        self.create()

    def put_text(self, heading, line1=None, line2=None):
        self.draw_text(heading, self.pixels_x/2, 20, size=25, font_file='bold', centered=True, scale_to_fit=True)
        if line1:
            self.draw_text(line1, self.pixels_x/2, 55, size=20, centered=True, scale_to_fit=True)
        if line2:
            self.draw_text(line2, self.pixels_x/2, 85, size=20, centered=True, scale_to_fit=True)