analyze_dxf.py.template

#!/usr/bin/env python3
"""
Analyze DXF files to find coordinate ranges and geometry characteristics

USAGE:
    1. Copy this file to analyze_dxf.py
    2. Edit the 'files' list at the bottom with your DXF file paths
    3. Run: python analyze_dxf.py
"""

import sys
import os
import re

def analyze_dxf(filename):
    """Parse DXF file and extract coordinate statistics"""
    print(f"\n{'='*70}")
    print(f"Analyzing: {os.path.basename(filename)}")
    print(f"{'='*70}\n")
    
    if not os.path.exists(filename):
        print(f"ERROR: File not found: {filename}")
        return
    
    x_coords = []
    y_coords = []
    
    with open(filename, 'r') as f:
        lines = f.readlines()
    
    # Parse DXF format
    i = 0
    while i < len(lines):
        line = lines[i].strip()
        
        # Group code 10 = X coordinate of start point
        if line == '10':
            i += 1
            try:
                x = float(lines[i].strip())
                x_coords.append(x)
            except ValueError:
                pass
        
        # Group code 20 = Y coordinate of start point
        elif line == '20':
            i += 1
            try:
                y = float(lines[i].strip())
                y_coords.append(y)
            except ValueError:
                pass
        
        # Group code 11 = X coordinate of end point
        elif line == '11':
            i += 1
            try:
                x = float(lines[i].strip())
                x_coords.append(x)
            except ValueError:
                pass
        
        # Group code 21 = Y coordinate of end point
        elif line == '21':
            i += 1
            try:
                y = float(lines[i].strip())
                y_coords.append(y)
            except ValueError:
                pass
        
        i += 1
    
    if not x_coords or not y_coords:
        print("No coordinates found in file!")
        return
    
    # Calculate statistics
    min_x, max_x = min(x_coords), max(x_coords)
    min_y, max_y = min(y_coords), max(y_coords)
    width = max_x - min_x
    height = max_y - min_y
    
    print(f"Total coordinate points: {len(x_coords)} X, {len(y_coords)} Y")
    print(f"\nX-axis range:")
    print(f"  Min: {min_x:.4f} mm")
    print(f"  Max: {max_x:.4f} mm")
    print(f"  Width: {width:.4f} mm")
    
    print(f"\nY-axis range:")
    print(f"  Min: {min_y:.4f} mm")
    print(f"  Max: {max_y:.4f} mm")
    print(f"  Height: {height:.4f} mm")
    
    print(f"\nBounding box: {width:.2f} mm × {height:.2f} mm")
    print(f"Origin offset: ({min_x:.2f}, {min_y:.2f})")
    
    # Check coordinate system
    if min_y < 0 and max_y <= 0:
        print(f"\n⚠️  WARNING: All Y coordinates are NEGATIVE!")
        print(f"   This suggests Y-axis inversion in coordinate system")
    elif min_y < 0:
        print(f"\n⚠️  WARNING: Y coordinates span negative values!")
        print(f"   Range: {min_y:.2f} to {max_y:.2f}")
    
    if min_x < 0 and max_x <= 0:
        print(f"\n⚠️  WARNING: All X coordinates are NEGATIVE!")
    
    # Check if geometry starts at origin
    if abs(min_x) > 1.0 or abs(min_y) > 1.0:
        print(f"\n⚠️  Geometry does NOT start at origin (0,0)")
        print(f"   Offset required: [{-min_x:.2f}, {-min_y:.2f}] mm")
    else:
        print(f"\n✓ Geometry starts near origin")
    
    return {
        'min_x': min_x,
        'max_x': max_x,
        'min_y': min_y,
        'max_y': max_y,
        'width': width,
        'height': height
    }

if __name__ == "__main__":
    # CONFIGURATION: Edit these paths to point to your DXF files
    # Example paths - replace with your actual file locations
    files = [
        "./fixture-rev_01/example_board-fixture.dxf",
        "./fixture-rev_01/example_board-outline.dxf",
        "./fixture-rev_01/example_board-track.dxf",
        "./fixture-rev_01/example_board-test.dxf",
    ]
    
    # Alternative: Analyze files passed as command-line arguments
    if len(sys.argv) > 1:
        files = sys.argv[1:]
    
    results = {}
    for filename in files:
        if os.path.exists(filename):
            results[os.path.basename(filename)] = analyze_dxf(filename)
        else:
            print(f"\nSkipping {os.path.basename(filename)} - file not found")
    
    print(f"\n{'='*70}")
    print("SUMMARY")
    print(f"{'='*70}\n")
    
    for name, data in results.items():
        if data:
            print(f"{name:40s} {data['width']:7.2f} x {data['height']:7.2f} mm")
            print(f"{'':40s} Origin: ({data['min_x']:7.2f}, {data['min_y']:7.2f})")
            print()