split png

import img2pdf
from PIL import Image
from io import BytesIO

def convert_png_to_pdf_multiple_pages(png_path, output_pdf_path, num_pages):
    """Converts a PNG image (of SVG) to a PDF with multiple A4 pages in landscape.

    Args:
        png_path (str): Path to the PNG image file.
        output_pdf_path (str): Path to save the generated PDF file.
        num_pages (int): Number of A4 pages to create in the PDF.
    """

    with open(png_path, "rb") as f:
        png_image = Image.open(f)
        png_image.load()
        png_width, png_height = png_image.size

    # Calculate A4 page dimensions (in pixels) with a small margin
    a4_width = 3508  # Standard A4 width in pixels (without margins) for landscape
    a4_height = 2480  # Standard A4 height in pixels (without margins) for landscape
    margin = 20  # Adjust margin as needed

    # Check if image dimensions fit within an A4 page with margins
    if png_width > a4_width - 2 * margin or png_height > a4_height - 2 * margin:
        print("Warning: Image dimensions exceed A4 page size with margins. Consider resizing or adjusting margins.")

    # Create a list to hold the BytesIO objects
    image_pages = []

    # Calculate the width of each slice
    slice_width = png_width // num_pages

    for page_num in range(num_pages):
        # Slice the image
        start_x = page_num * slice_width
        end_x = start_x + slice_width if page_num < num_pages - 1 else png_width
        slice_image = png_image.crop((start_x, 0, end_x, png_height))

        # Save the slice to a BytesIO object
        byte_data = BytesIO()
        slice_image.save(byte_data, format='PNG')
        byte_data.seek(0)
        image_pages.append(byte_data)

    # Convert the list of BytesIO objects to PDF and save the output
    with open(output_pdf_path, "wb") as f:
        f.write(img2pdf.convert(image_pages, dpi=350, x=None, y=None))

    print(f"Converted PNG to PDF with {num_pages} pages: {output_pdf_path}")

# Example usage
png_path = "C:\\Temp\\SVGEditing\\new3.png"
output_pdf_path = "c:\\Temp\\new3__.pdf"
num_pages = 4  # Adjust number of pages as needed
convert_png_to_pdf_multiple_pages(png_path, output_pdf_path, num_pages)