f1-circuits/circuits/svg-generator.py

import os
import json
import matplotlib.pyplot as plt
from dataclasses import dataclass
from typing import List, Dict, Any, Optional, Tuple
from pathlib import Path

@dataclass
class Circuit:
    """Model class representing an F1 circuit."""
    id: str
    name: str
    location: str
    opened: Optional[int] = None
    first_gp: Optional[int] = None
    length: Optional[int] = None  # in meters
    altitude: Optional[int] = None
    coordinates: List[Tuple[float, float]] = None
    bbox: Optional[List[float]] = None

    def __post_init__(self):
        if self.coordinates is None:
            self.coordinates = []

    def plot(self):
        """Generate a simple plot of the circuit with transparent background and no grid/axes."""
        if not self.coordinates:
            print(f"No coordinates available for {self.name}")
            return

        # Extract longitude and latitude from coordinates
        lons, lats = zip(*self.coordinates)

        # Create figure with transparent background
        fig = plt.figure(figsize=(10, 8), facecolor="none")
        ax = fig.add_subplot(111)

        # Plot the circuit with black line
        ax.plot(lons, lats, 'k-', linewidth=2)

        # Remove grid, axes, and title
        ax.grid(False)
        ax.set_xticks([])
        ax.set_yticks([])
        ax.spines['top'].set_visible(False)
        ax.spines['right'].set_visible(False)
        ax.spines['bottom'].set_visible(False)
        ax.spines['left'].set_visible(False)

        # Keep aspect ratio equal
        ax.set_aspect('equal')

        # Add padding around the circuit
        ax.margins(0.1)

        # Tight layout
        plt.tight_layout()

        return fig

def create_empty_geojson(circuit_name: str, location: str, file_path: Path):
    """Create an empty GeoJSON template file"""
    template = {
        "type": "FeatureCollection",
        "features": [{
            "type": "Feature",
            "properties": {
                "Name": circuit_name,
                "Location": location,
                "opened": None,
                "firstgp": None,
                "length": None,
                "altitude": None
            },
            "geometry": {
                "type": "LineString",
                "coordinates": []
            }
        }]
    }

    file_path.parent.mkdir(parents=True, exist_ok=True)
    with open(file_path, 'w', encoding='utf-8') as f:
        json.dump(template, f, indent=2)
    print(f"Created empty GeoJSON template: {file_path}")

def load_circuits_json() -> dict:
    """Load the circuits.json file"""
    with open("circuits.json", 'r', encoding='utf-8') as f:
        return json.load(f)

def process_circuit_files():
    """Process all circuit files based on circuits.json data"""
    data = load_circuits_json()

    for country, country_data in data.items():
        country_slug = country_data['slug']

        for city, city_data in country_data['cities'].items():
            city_slug = city_data['slug']

            for circuit_name, circuit_data in city_data['circuits'].items():
                circuit_slug = circuit_data['slug']

                if 'layouts' in circuit_data:
                    for layout_years, layout_data in circuit_data['layouts'].items():
                        layout_slug = layout_data['slug']

                        # Construct file paths
                        base_path = Path(f"{country_slug}/{city_slug}/{circuit_slug}")
                        geo_path = base_path / f"{layout_slug}.geo.json"
                        svg_path = base_path / f"{layout_slug}.svg"
                        png_path = base_path / f"{layout_slug}.png"

                        # Create empty GeoJSON if missing
                        if not geo_path.exists():
                            create_empty_geojson(circuit_name, f"{city}, {country}", geo_path)
                            continue  # Skip SVG/PNG generation as we have no coordinates

                        # Parse existing GeoJSON and generate SVG/PNG if needed
                        circuit = parse_geojson(geo_path)
                        if circuit:
                            if not svg_path.exists():
                                print(f"Generating SVG: {svg_path}")
                                save_svg(circuit, svg_path)

                            if not png_path.exists():
                                print(f"Generating PNG: {png_path}")
                                fig = circuit.plot()
                                if fig:
                                    fig.savefig(png_path, transparent=True, bbox_inches='tight', pad_inches=0.1)
                                    plt.close(fig)


def save_svg(circuit: Circuit, output_path: str):
    """Generate and save an SVG representation of the circuit."""
    if not circuit.coordinates:
        print(f"No coordinates available for {circuit.name}")
        return

    # Extract coordinates
    lons, lats = zip(*circuit.coordinates)

    # Normalize coordinates to fit in SVG
    min_lon, max_lon = min(lons), max(lons)
    min_lat, max_lat = min(lats), max(lats)

    # Add some padding
    lon_padding = (max_lon - min_lon) * 0.05
    lat_padding = (max_lat - min_lat) * 0.05

    min_lon -= lon_padding
    max_lon += lon_padding
    min_lat -= lat_padding
    max_lat += lat_padding

    # SVG dimensions
    svg_width = 800
    svg_height = int(svg_width * (max_lat - min_lat) / (max_lon - min_lon))

    # Create SVG header
    svg = [
        f'<?xml version="1.0" encoding="UTF-8" standalone="no"?>',
        f'<svg width="{svg_width}" height="{svg_height}" viewBox="0 0 {svg_width} {svg_height}" xmlns="http://www.w3.org/2000/svg">',
        f'  <title>{circuit.name} - {circuit.location}</title>'
    ]

    # Create path data
    path_data = []
    for i, (lon, lat) in enumerate(circuit.coordinates):
        # Convert geo coordinates to SVG coordinates
        x = svg_width * (lon - min_lon) / (max_lon - min_lon)
        # Flip y-axis because SVG has origin at top-left
        y = svg_height * (1 - (lat - min_lat) / (max_lat - min_lat))

        if i == 0:
            path_data.append(f"M{x:.2f},{y:.2f}")
        else:
            path_data.append(f"L{x:.2f},{y:.2f}")

    # Add path to SVG
    svg.append(f'  <path d="{" ".join(path_data)}" fill="none" stroke="black" stroke-width="2"/>')
    svg.append('</svg>')

    # Write SVG to file
    os.makedirs(os.path.dirname(output_path), exist_ok=True)
    with open(output_path, 'w', encoding='utf-8') as f:
        f.write('\n'.join(svg))

    print(f"SVG saved to: {output_path}")

def main():
    print("Processing circuit files...")
    process_circuit_files()
    print("Done!")

if __name__ == "__main__":
    main()