f1-circuits/models/track_layout.py

import json
import os
from dataclasses import dataclass
from pathlib import Path
from typing import Optional
from models.geo_json.geo_json import GeoJSON

from typing import TYPE_CHECKING

if TYPE_CHECKING:
    from models.circuit import Circuit

@dataclass
class TrackLayout:
    slug: str
    description: str
    imageUrl: Optional[str]
    circuit: 'Circuit'
    _geo_data: Optional[GeoJSON] = None

    @classmethod
    def from_dict(cls, circuit: 'Circuit', slug: str, data: dict) -> 'TrackLayout':
        return cls(
            slug=slug,
            description=data["description"],
            imageUrl=data["imageUrl"],
            circuit=circuit
        )

    @property
    def coordinates(self) -> list[tuple[float, float]]:
        return self._geo_data.features[0].geometry.coordinates

    def _relative_filepath(self, extension: str) -> Path:
        return Path(f"{self.circuit.locality.country.slug}/"
                    f"{self.circuit.locality.slug}/"
                    f"{self.circuit.slug}/"
                    f"{self.slug}.{extension}")

    @property
    def relative_geojson_filepath(self) -> Optional[Path]:
        return self._relative_filepath("geo.json")

    @property
    def relative_svg_filepath(self) -> Optional[Path]:
        return self._relative_filepath("svg")

    @property
    def relative_png_filepath(self) -> Optional[Path]:
        return self._relative_filepath("png")

    def load_geo_json_data(self):
        """Load GeoJSON data for this layout"""
        file_path = Path(f"./circuits").joinpath(self.relative_geojson_filepath)

        if not file_path.exists():
            return None

        try:
            with open(file_path, 'r') as f:
                data = json.load(f)

            self._geo_data = GeoJSON.from_dict(self.circuit, data)

        except Exception as e:
            print(f"Error loading GeoJSON data: {e}")
            return None

    def save_svg(self, path: Path, default_width: int=150, aspect_ratio: float=1.6):
        if not self.coordinates:
            print(f"No coordinates available for {self.circuit.name}")
            return

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

        # Calculate canvas dimensions based on provided parameters
        svg_width = default_width
        svg_height = int(svg_width / aspect_ratio)  # Higher aspect ratio = wider rectangle

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

        # Add 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

        # Calculate scaling factors for both dimensions
        lon_scale = svg_width / (max_lon - min_lon)
        lat_scale = svg_height / (max_lat - min_lat)

        # Use the smaller scaling factor to ensure the track fits within bounds
        scale = min(lon_scale, lat_scale)

        # Calculate centering offsets
        lon_offset = (svg_width - (max_lon - min_lon) * scale) / 2
        lat_offset = (svg_height - (max_lat - min_lat) * scale) / 2

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

        # Create path data
        path_data = []
        for i, (lon, lat) in enumerate(self.coordinates):
            # Scale and center the coordinates
            x = ((lon - min_lon) * scale) + lon_offset
            y = svg_height - ((lat - min_lat) * scale) - lat_offset

            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
        svg_path = path.joinpath(self.relative_svg_filepath)
        os.makedirs(os.path.dirname(svg_path), exist_ok=True)
        with open(svg_path, 'w', encoding='utf-8') as f:
            f.write('\n'.join(svg))

        print(f"SVG saved to: {self.relative_svg_filepath}")