combine-tiles.py

from PIL import Image
import os

# Define the directory where tiles are stored and the output file
tiles_dir = 'tiles_zoom_16'  # Replace with your directory
output_file = 'combined_image_16.png'

# Define the tile size (standard is 256x256 pixels)
tile_size = 256

# Get all tile files and extract their coordinates
tile_files = [f for f in os.listdir(tiles_dir) if f.endswith('.png')]
tile_coords = [tuple(map(int, os.path.splitext(f)[0].split('_'))) for f in tile_files]

if not tile_coords:
    raise ValueError("No tile files found in the specified directory.")

# Determine the range of x and y coordinates
x_coords, y_coords = zip(*tile_coords)
min_x, max_x = min(x_coords), max(x_coords)
min_y, max_y = min(y_coords), max(y_coords)

# Calculate the size of the final image based on the range of coordinates
image_width = (max_x - min_x + 1) * tile_size
image_height = (max_y - min_y + 1) * tile_size

# Create a new blank image with the calculated size
combined_image = Image.new('RGBA', (image_width, image_height))

# Paste each tile onto the combined image
for (x, y) in tile_coords:
    tile_file = f"{x}_{y}.png"
    tile_path = os.path.join(tiles_dir, tile_file)
    
    if os.path.exists(tile_path):
        # Load the tile image
        tile_image = Image.open(tile_path)
        
        # Compute the position where the tile should be placed
        x_pos = (x - min_x) * tile_size
        y_pos = (y - min_y) * tile_size
        
        # Paste the tile onto the combined image
        combined_image.paste(tile_image, (x_pos, y_pos))
    else:
        print(f"Tile {tile_file} not found.")

# Save the combined image
combined_image.save(output_file)

print(f'Combined image saved as {output_file}')