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
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documentation/demo_pdf_system.py
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237
documentation/demo_pdf_system.py
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#!/usr/bin/env python3
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"""
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Demo: PDF Label Generation System
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Shows how to use the new PDF-based label printing system
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"""
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import os
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import sys
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# Add current directory to path
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sys.path.insert(0, os.path.dirname(__file__))
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from print_label_pdf import PDFLabelGenerator, create_label_pdf_file
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from print_label import print_label_standalone, create_label_pdf
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def demo_basic_pdf_generation():
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"""Demo 1: Basic PDF generation"""
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print("=" * 60)
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print("DEMO 1: Basic PDF Label Generation")
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print("=" * 60)
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# Create a simple label
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pdf_file = create_label_pdf_file(
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text="SAP-12345|Qty:100|LOT-ABC",
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filename="demo_label_basic.pdf"
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)
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print(f"✓ Generated: {pdf_file}")
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print(f"✓ File size: {os.path.getsize(pdf_file)} bytes")
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print()
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def demo_custom_dimensions():
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"""Demo 2: Custom label dimensions"""
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print("=" * 60)
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print("DEMO 2: Custom Label Dimensions")
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print("=" * 60)
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# Create generator with custom size (smaller label)
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generator = PDFLabelGenerator(label_width=6, label_height=4, dpi=300)
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pdf_file = generator.create_label_pdf(
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sap_nr="SAP-67890",
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cantitate="Qty:250",
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lot_number="LOT-XYZ",
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filename="demo_label_custom.pdf"
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)
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print(f"✓ Custom 6cm × 4cm label generated")
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print(f"✓ File: {pdf_file}")
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print(f"✓ File size: {os.path.getsize(pdf_file)} bytes")
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print()
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def demo_batch_generation():
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"""Demo 3: Batch label generation"""
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print("=" * 60)
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print("DEMO 3: Batch Label Generation")
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print("=" * 60)
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labels_data = [
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("SAP-001", "Qty:100", "LOT-A"),
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("SAP-002", "Qty:200", "LOT-B"),
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("SAP-003", "Qty:300", "LOT-C"),
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("SAP-004", "Qty:150", "LOT-D"),
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]
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generator = PDFLabelGenerator()
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generated_files = []
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for idx, (sap, qty, lot) in enumerate(labels_data, 1):
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pdf_file = generator.create_label_pdf(
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sap_nr=sap,
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cantitate=qty,
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lot_number=lot,
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filename=f"demo_batch_label_{idx:02d}.pdf"
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)
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generated_files.append(pdf_file)
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print(f" [{idx}] Generated {pdf_file}")
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total_size = sum(os.path.getsize(f) for f in generated_files)
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print(f"\n✓ Total: {len(generated_files)} labels generated")
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print(f"✓ Combined size: {total_size} bytes")
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print()
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def demo_high_dpi():
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"""Demo 4: High DPI for ultra-quality printing"""
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print("=" * 60)
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print("DEMO 4: High DPI Generation (600 DPI)")
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print("=" * 60)
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# Create generator with higher DPI for premium printing
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generator = PDFLabelGenerator(label_width=8.5, label_height=6, dpi=600)
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pdf_file = generator.create_label_pdf(
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sap_nr="SAP-PREMIUM",
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cantitate="Qty:500",
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lot_number="LOT-PREMIUM",
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filename="demo_label_600dpi.pdf"
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)
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print(f"✓ 600 DPI Ultra-quality label generated")
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print(f"✓ File: {pdf_file}")
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print(f"✓ File size: {os.path.getsize(pdf_file)} bytes")
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print(f"✓ Use this for color-critical or high-volume production")
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print()
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def demo_api_usage():
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"""Demo 5: Using the convenience API"""
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print("=" * 60)
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print("DEMO 5: Convenience API Usage")
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print("=" * 60)
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# Method 1: Simple function
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print("Method 1: Using print_label_standalone()")
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print(" Usage: print_label_standalone(text, printer, preview=0, use_pdf=True)")
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print()
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# Method 2: Direct PDF creation
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print("Method 2: Using create_label_pdf()")
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pdf_file = create_label_pdf("SAP-TEST|Qty:999|LOT-TEST")
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print(f" ✓ Generated: {pdf_file}")
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print()
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# Method 3: Generator class
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print("Method 3: Using PDFLabelGenerator class")
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print(" Usage:")
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print(" generator = PDFLabelGenerator()")
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print(" pdf = generator.create_label_pdf(sap_nr, qty, lot, filename)")
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print()
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def demo_comparison():
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"""Demo 6: PNG vs PDF comparison"""
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print("=" * 60)
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print("DEMO 6: PNG vs PDF Comparison")
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print("=" * 60)
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from print_label import create_label_image
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# Generate PNG
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png_img = create_label_image("SAP-CMP|Qty:100|LOT-CMP")
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png_file = "demo_comparison_png.png"
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png_img.save(png_file)
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png_size = os.path.getsize(png_file)
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# Generate PDF
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pdf_file = create_label_pdf_file("SAP-CMP|Qty:100|LOT-CMP", "demo_comparison_pdf.pdf")
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pdf_size = os.path.getsize(pdf_file)
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print("File Size Comparison:")
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print(f" PNG: {png_size:,} bytes")
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print(f" PDF: {pdf_size:,} bytes")
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print(f" Savings: {png_size - pdf_size:,} bytes ({((png_size-pdf_size)/png_size)*100:.1f}%)")
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print()
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print("Quality Comparison:")
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print(" PNG: Rasterized, fixed resolution")
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print(" PDF: Vector-based, infinite scalability")
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print()
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print("Recommended Use:")
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print(" ✓ Use PDF for production printing (recommended)")
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print(" ✓ Use PNG for legacy systems or special cases")
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print()
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def cleanup_demo_files():
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"""Clean up generated demo files"""
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print("=" * 60)
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print("Cleaning up demo files...")
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print("=" * 60)
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demo_files = [
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"demo_label_basic.pdf",
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"demo_label_custom.pdf",
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"demo_batch_label_01.pdf",
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"demo_batch_label_02.pdf",
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"demo_batch_label_03.pdf",
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"demo_batch_label_04.pdf",
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"demo_label_600dpi.pdf",
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"demo_comparison_png.png",
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"demo_comparison_pdf.pdf",
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]
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for filename in demo_files:
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if os.path.exists(filename):
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os.remove(filename)
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print(f" ✓ Removed {filename}")
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print("\n✓ Cleanup complete")
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print()
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if __name__ == "__main__":
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print("\n")
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print("╔" + "═" * 58 + "╗")
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print("║" + " " * 58 + "║")
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print("║" + " PDF Label Generation System - Comprehensive Demo".center(58) + "║")
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print("║" + " " * 58 + "║")
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print("╚" + "═" * 58 + "╝")
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print("\n")
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try:
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# Run all demos
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demo_basic_pdf_generation()
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demo_custom_dimensions()
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demo_batch_generation()
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demo_high_dpi()
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demo_api_usage()
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demo_comparison()
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# Ask about cleanup
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print("\nDo you want to clean up demo files? (y/n): ", end="")
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# For automated testing, auto-cleanup
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cleanup_demo_files()
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print("\n" + "=" * 60)
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print("✓ All demos completed successfully!")
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print("=" * 60)
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print("\nKey Takeaways:")
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print(" 1. PDF generation is the recommended format for printing")
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print(" 2. Supports custom dimensions and DPI settings")
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print(" 3. File sizes are comparable to PNG with better quality")
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print(" 4. Batch processing is simple and efficient")
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print(" 5. Full backward compatibility with PNG option")
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print("\nFor more information, see PDF_UPGRADE_GUIDE.md")
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print()
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except Exception as e:
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print(f"\n❌ Error during demo: {e}")
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import traceback
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traceback.print_exc()
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sys.exit(1)
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