Add first draft of label generation

.vscode/launch.json

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+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Python: Current File",
+            "type": "python",
+            "request": "launch",
+            "program": "${workspaceFolder}/generate_label_example.py",
+            "console": "integratedTerminal",
+            "args": []
+        }
+    ]
+}

generate_label_example.py

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+import shimatta_label.label_image as li
+import shimatta_label.brother_ql_wrapper as ql_wrapper
+import os
+
+label = li.MiceToiletLabel()
+label.put_text('100n 10%% biggggg', 'X7R 50V', 'AVX')
+ff = label.save()
+print('Created Tempfile: ', ff)
+try:
+    printer = ql_wrapper.BrotherQlPrinter()
+    printer.print_image(ff, cut=False)
+    printer.print_image(ff, cut=False)
+    printer.print_image(ff, cut=True)
+finally:
+    os.remove(ff)

shimatta_label/brother_ql_wrapper.py

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+import subprocess, os
+
+class BrotherQlPrinter():
+    def __init__(self, model='QL-800', printer_connection='usb://0x04f9:0x209b'):
+        self.model = model
+        self.printer = printer_connection
+
+    def print_image(self, image, label='12', rotation=90, cut=True):
+        env_vars = os.environ
+        env_vars['BROTHER_QL_MODEL'] = self.model
+        env_vars['BROTHER_QL_PRINTER'] = self.printer
+        cutstr = ''
+
+        
+        cmdline = ['brother_ql', 'print', '-l', f'{label}', '-r', f'{rotation}']
+        if not cut:
+            cmdline.append('--no-cut')
+        cmdline.append(f'{image}')
+        print(cmdline)
+
+        res = subprocess.run(cmdline, env=env_vars)
+        return res.returncode

shimatta_label/label_image.py

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+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)