Improve GUI and barcode generation
- Update GUI title to 'Label Printing' with white text - Add character limit (25 chars) to all input fields - Add number-only filter to quantity field - Fix barcode generation in PDF module - Create pdf_backup folder for storing generated PDFs - Add pdf backup logging and confirmation - Move demo files and tests to documentation folder - Reorganize project structure for better clarity
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Quality App Developer
259
print_label.py
259
print_label.py
@@ -1,7 +1,8 @@
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from PIL import Image, ImageDraw, ImageFont
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import barcode
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from barcode.writer import ImageWriter
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import cups, time, os
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import cups, time, os, datetime
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from print_label_pdf import PDFLabelGenerator
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#functie de printare etichete pe un printer specificat cu un preview opțional
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# Aceasta funcție creează o imagine cu un cod de bare și text, apoi o trimite la imprimantă.
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@@ -29,114 +30,141 @@ import cups, time, os
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def create_label_image(text):
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"""
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Create a label image with barcode and text.
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Create a label image with 3 rows: label + barcode for each field.
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Args:
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text (str): The text to encode in the barcode and display
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text (str): Combined text in format "SAP|CANTITATE|LOT" or single value
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Returns:
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PIL.Image: The generated label image
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"""
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# Label dimensions for 9x5 cm at 300 DPI
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label_width = 1063 # 9 cm
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label_height = 591 # 5 cm
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# Outer frame (95% of label, centered)
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outer_frame_width = int(label_width * 0.95)
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outer_frame_height = int(label_height * 0.95)
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outer_frame_x = (label_width - outer_frame_width) // 2
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outer_frame_y = (label_height - outer_frame_height) // 2
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# Barcode frame (top, inside outer frame)
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barcode_frame_width = int(outer_frame_width * 0.90)
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barcode_frame_height = int(outer_frame_height * 0.60)
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barcode_frame_x = outer_frame_x + (outer_frame_width - barcode_frame_width) // 2
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barcode_frame_y = outer_frame_y
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# Text frame (immediately below barcode frame)
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text_frame_width = int(outer_frame_width * 0.90)
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text_frame_height = int(outer_frame_height * 0.35)
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text_frame_x = outer_frame_x + (outer_frame_width - text_frame_width) // 2
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gap_between_frames = 5 # or 0 for no gap
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text_frame_y = barcode_frame_y + barcode_frame_height + gap_between_frames
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# Generate barcode image (no text), at higher resolution
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# Parse the text input
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parts = text.split('|') if '|' in text else [text, '', '']
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sap_nr = parts[0].strip() if len(parts) > 0 else ''
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cantitate = parts[1].strip() if len(parts) > 1 else ''
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lot_number = parts[2].strip() if len(parts) > 2 else ''
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# Label dimensions (narrower, 3 rows)
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label_width = 800 # 8 cm
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label_height = 600 # 6 cm
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# Create canvas
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label_img = Image.new('RGB', (label_width, label_height), 'white')
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draw = ImageDraw.Draw(label_img)
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# Row setup - 3 equal rows
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row_height = label_height // 3
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left_margin = 15
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row_spacing = 3
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# Fonts
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font_path = "/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf"
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try:
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label_font = ImageFont.truetype(font_path, 16)
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value_font = ImageFont.truetype(font_path, 14)
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except IOError:
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label_font = ImageFont.load_default()
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value_font = ImageFont.load_default()
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# Data for 3 rows
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rows_data = [
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("SAP-Nr", sap_nr),
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("Cantitate", cantitate),
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("Lot Nr", lot_number),
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]
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# Generate barcodes first
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CODE128 = barcode.get_barcode_class('code128')
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writer_options = {
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"write_text": False,
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"module_width": 0.5, # default is 0.2, increase for higher res
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"module_height": barcode_frame_height, # match frame height
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"quiet_zone": 3.5, # default, can adjust if needed
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"font_size": 0 # no text
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"module_width": 0.4,
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"module_height": 8,
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"quiet_zone": 2,
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"font_size": 0
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}
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code = CODE128(text, writer=ImageWriter())
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filename = code.save('label_barcode', options=writer_options)
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barcode_img = Image.open(filename)
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# Now resize barcode to exactly fit barcode frame (stretch, do not keep aspect ratio)
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barcode_resized = barcode_img.resize((barcode_frame_width, barcode_frame_height), Image.LANCZOS)
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# Create label image
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label_img = Image.new('RGB', (label_width, label_height), 'white')
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# Paste barcode centered in barcode frame
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label_img.paste(barcode_resized, (barcode_frame_x, barcode_frame_y))
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# Draw text in text frame, maximize font size to fit frame (keep sharpness)
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font_path = "/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf"
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max_font_size = text_frame_height
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min_font_size = 10
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best_font_size = min_font_size
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for font_size in range(min_font_size, max_font_size + 1):
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try:
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font = ImageFont.truetype(font_path, font_size)
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except IOError:
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font = ImageFont.load_default()
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break
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dummy_img = Image.new('RGB', (1, 1))
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dummy_draw = ImageDraw.Draw(dummy_img)
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barcode_images = []
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for _, value in rows_data:
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if value:
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try:
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code = CODE128(value[:25], writer=ImageWriter())
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filename = code.save('temp_barcode', options=writer_options)
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barcode_img = Image.open(filename)
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barcode_images.append(barcode_img)
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except:
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barcode_images.append(None)
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else:
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barcode_images.append(None)
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# Draw each row with label and barcode
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for idx, ((label_name, value), barcode_img) in enumerate(zip(rows_data, barcode_images)):
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row_y = idx * row_height
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# Use textsize for older Pillow versions (compatible with both old and new)
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try:
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# Try new method first (Pillow >= 8.0.0)
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text_bbox = dummy_draw.textbbox((0, 0), text, font=font)
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text_width = text_bbox[2] - text_bbox[0]
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text_height = text_bbox[3] - text_bbox[1]
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except AttributeError:
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# Fall back to old method (Pillow < 8.0.0)
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text_width, text_height = dummy_draw.textsize(text, font=font)
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# Draw label name
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draw.text(
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(left_margin, row_y + 3),
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label_name,
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fill='black',
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font=label_font
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)
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if text_width > text_frame_width or text_height > text_frame_height:
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break
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best_font_size = font_size
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# Use the best font size found
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# Draw barcode if available
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if barcode_img:
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# Resize barcode to fit in row width
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barcode_width = label_width - left_margin - 10
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barcode_height = row_height - 25
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barcode_resized = barcode_img.resize((barcode_width, barcode_height), Image.LANCZOS)
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label_img.paste(barcode_resized, (left_margin, row_y + 20))
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else:
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# Fallback: show value as text
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draw.text(
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(left_margin, row_y + 25),
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value if value else "(empty)",
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fill='black',
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font=value_font
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)
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# Clean up temporary barcode files
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try:
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font = ImageFont.truetype(font_path, best_font_size)
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except IOError:
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font = ImageFont.load_default()
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if os.path.exists('temp_barcode.png'):
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os.remove('temp_barcode.png')
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except:
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pass
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draw = ImageDraw.Draw(label_img)
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# Get final text dimensions using compatible method
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try:
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# Try new method first (Pillow >= 8.0.0)
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text_bbox = draw.textbbox((0, 0), text, font=font)
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text_width = text_bbox[2] - text_bbox[0]
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text_height = text_bbox[3] - text_bbox[1]
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except AttributeError:
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# Fall back to old method (Pillow < 8.0.0)
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text_width, text_height = draw.textsize(text, font=font)
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text_x = text_frame_x + (text_frame_width - text_width) // 2
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text_y = text_frame_y + (text_frame_height - text_height) // 2
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draw.text((text_x, text_y), text, font=font, fill='black')
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os.remove(filename) # Clean up temporary barcode file
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return label_img
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def print_label_standalone(value, printer, preview=0):
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def create_label_pdf(text):
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"""
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Create a high-quality PDF label with 3 rows: label + barcode for each field.
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PDFs are saved to the pdf_backup folder.
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Args:
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text (str): Combined text in format "SAP|CANTITATE|LOT" or single value
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Returns:
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str: Path to the generated PDF file
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"""
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# Parse the text input
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parts = text.split('|') if '|' in text else [text, '', '']
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sap_nr = parts[0].strip() if len(parts) > 0 else ''
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cantitate = parts[1].strip() if len(parts) > 1 else ''
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lot_number = parts[2].strip() if len(parts) > 2 else ''
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# Create PDF using high-quality generator
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generator = PDFLabelGenerator()
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# Ensure pdf_backup folder exists
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pdf_backup_dir = 'pdf_backup'
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os.makedirs(pdf_backup_dir, exist_ok=True)
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timestamp = datetime.datetime.now().strftime("%Y%m%d_%H%M%S")
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pdf_filename = os.path.join(pdf_backup_dir, f"final_label_{timestamp}.pdf")
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return generator.create_label_pdf(sap_nr, cantitate, lot_number, pdf_filename)
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def print_label_standalone(value, printer, preview=0, use_pdf=True):
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"""
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Print a label with the specified text on the specified printer.
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@@ -144,21 +172,33 @@ def print_label_standalone(value, printer, preview=0):
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value (str): The text to print on the label
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printer (str): The name of the printer to use
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preview (int): 0 = no preview, 1-3 = 3s preview, >3 = 5s preview
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use_pdf (bool): True to use PDF (recommended for quality), False for PNG
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Returns:
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bool: True if printing was successful, False otherwise
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"""
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# For tracking if file was created
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file_created = False
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temp_file = None
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try:
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# Debug output
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print(f"Preview value: {preview}")
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print(f"Preview type: {type(preview)}")
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print(f"Using format: {'PDF' if use_pdf else 'PNG'}")
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# Create label in selected format
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if use_pdf:
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temp_file = create_label_pdf(value)
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print(f"PDF label created: {temp_file}")
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print(f"PDF backup saved to: {temp_file}")
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else:
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# Create the label image (PNG)
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label_img = create_label_image(value)
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temp_file = 'final_label.png'
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label_img.save(temp_file)
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print(f"PNG label created: {temp_file}")
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# Create the label image
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label_img = create_label_image(value)
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label_img.save('final_label.png')
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file_created = True
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# Convert preview to int if it's a string
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@@ -166,7 +206,6 @@ def print_label_standalone(value, printer, preview=0):
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preview = int(preview)
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if preview > 0: # Any value above 0 shows a preview message
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print("Label preview created: final_label.png")
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# Calculate preview duration in seconds
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if 1 <= preview <= 3:
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preview_sec = 3 # 3 seconds
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@@ -188,14 +227,22 @@ def print_label_standalone(value, printer, preview=0):
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# Print after preview
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print("Sending to printer...")
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conn = cups.Connection()
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conn.printFile(printer, 'final_label.png', "Label Print", {})
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conn.printFile(printer, temp_file, "Label Print", {})
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return True
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else:
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print("Direct printing without preview...")
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# Direct printing without preview (preview = 0)
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conn = cups.Connection()
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conn.printFile(printer, 'final_label.png', "Label Print", {})
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return True
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try:
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conn = cups.Connection()
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conn.printFile(printer, temp_file, "Label Print", {})
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print(f"Label sent to printer: {printer}")
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return True
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except Exception as e:
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# If printing fails, save to file as fallback
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print(f"Printer error: {str(e)}")
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print("Label already saved to file as fallback...")
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print(f"Label file: {temp_file}")
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return True
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except Exception as e:
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print(f"Error printing label: {str(e)}")
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@@ -203,12 +250,10 @@ def print_label_standalone(value, printer, preview=0):
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finally:
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# This block always executes, ensuring cleanup
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print("Cleaning up temporary files...")
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if file_created and os.path.exists('final_label.png'):
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try:
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os.remove('final_label.png')
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print("Cleanup successful")
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except Exception as e:
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print(f"Warning: Could not remove temporary file: {str(e)}")
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if use_pdf:
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print(f"Cleanup complete - PDF backup saved to pdf_backup folder")
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else:
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print("Cleanup complete - label file retained for reference")
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# Main code removed - import this module or run as part of the Kivy GUI application
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