Vector Tile Rendering

/**
 * Layer for rendering Mapbox Vector Tiles (MVT) with automatic GeoJSON conversion
 * Extends TileLayer with MVT-specific functionality and optimizations
 */
class MVTLayer<FeaturePropertiesT = unknown> extends TileLayer<ParsedMvtTile> {
  constructor(props: MVTLayerProps<FeaturePropertiesT>);
}

interface MVTLayerProps<FeaturePropertiesT = unknown> extends 
  Omit<TileLayerProps<ParsedMvtTile>, 'data'>,
  Omit<GeoJsonLayerProps<FeaturePropertiesT>, 'data'> {
    
  /** TileJSON specification or URL template for MVT tiles */
  data: TileJson | URLTemplate;
  
  /** Called if data is a TileJSON URL when it is successfully fetched */
  onDataLoad?: ((tilejson: TileJson | null) => void) | null;
  
  /** Needed for highlighting a feature split across two or more tiles */
  uniqueIdProperty?: string;
  
  /** A feature with ID corresponding to the supplied value will be highlighted */
  highlightedFeatureId?: string | number | null;
  
  /** Use tile data in binary format for better performance */
  binary?: boolean;
  
  /** Loaders for processing MVT data */
  loaders?: any[];
}

interface MVTLayerPickingInfo<FeaturePropertiesT = {}> extends 
  TileLayerPickingInfo<ParsedMvtTile, PickingInfo<Feature<Geometry, FeaturePropertiesT>>> {
  /** Additional MVT-specific picking information */
}

type ParsedMvtTile = Feature[] | BinaryFeatureCollection;

import { MVTLayer } from "@deck.gl/geo-layers";

// Basic MVT layer with Mapbox tiles
const mvtLayer = new MVTLayer({
  id: 'mvt-layer',
  data: 'https://api.tiles.mapbox.com/v4/mapbox.mapbox-streets-v6/{z}/{x}/{y}.vector.pbf?access_token={token}',
  
  // GeoJSON styling props
  getFillColor: [140, 170, 180, 200],
  getLineColor: [255, 255, 255],
  getLineWidth: 1,
  lineWidthMinPixels: 1,
  
  pickable: true
});

// MVT layer with TileJSON specification
const tileJsonLayer = new MVTLayer({
  id: 'tilejson-layer',
  data: 'https://api.example.com/tiles.json',
  onDataLoad: (tilejson) => {
    console.log('TileJSON loaded:', tilejson);
  },
  getFillColor: [160, 180, 200],
  pickable: true
});

// MVT layer with feature highlighting
const highlightLayer = new MVTLayer({
  id: 'highlight-layer',
  data: 'https://tiles.example.com/data/{z}/{x}/{y}.mvt',
  uniqueIdProperty: 'id',
  highlightedFeatureId: 12345,
  
  getFillColor: f => f.properties.id === 12345 ? [255, 0, 0] : [140, 170, 180],
  getLineColor: [255, 255, 255],
  pickable: true,
  
  onHover: info => {
    if (info.object) {
      // Update highlighting based on hover
      layer.setProps({
        highlightedFeatureId: info.object.properties.id
      });
    }
  }
});

// MVT layer with custom binary processing
const binaryMvtLayer = new MVTLayer({
  id: 'binary-mvt',
  data: 'https://tiles.example.com/{z}/{x}/{y}.mvt',
  binary: true, // Use binary format for better performance
  
  // Custom styling based on binary feature properties
  getFillColor: f => {
    const category = f.properties?.category;
    switch (category) {
      case 'residential': return [255, 255, 0, 100];
      case 'commercial': return [255, 0, 255, 100];
      case 'industrial': return [0, 255, 255, 100];
      default: return [200, 200, 200, 100];
    }
  },
  
  getLineColor: [255, 255, 255],
  lineWidthMinPixels: 1,
  pickable: true
});

interface TileJson {
  /** TileJSON specification version */
  tilejson: string;
  
  /** An array of tile endpoints */
  tiles: string[];
  
  /** Vector layer information */
  vector_layers: VectorLayer[];
  
  /** Attribution text for the tiles */
  attribution?: string;
  
  /** Tile scheme (xyz or tms) */
  scheme?: string;
  
  /** Maximum zoom level */
  maxzoom?: number;
  
  /** Minimum zoom level */
  minzoom?: number;
  
  /** TileJSON version */
  version?: string;
  
  /** Tile bounds */
  bounds?: [number, number, number, number];
  
  /** Tile center */
  center?: [number, number, number];
}

interface VectorLayer {
  /** Layer identifier */
  id: string;
  
  /** Layer description */
  description?: string;
  
  /** Minimum zoom level for this layer */
  minzoom?: number;
  
  /** Maximum zoom level for this layer */
  maxzoom?: number;
  
  /** Attribute fields for features in this layer */
  fields?: {[key: string]: string};
}

// Using TileJSON URL
const layer = new MVTLayer({
  id: 'tilejson-layer',
  data: 'https://api.example.com/tiles.json',
  onDataLoad: (tilejson) => {
    console.log('Available layers:', tilejson.vector_layers);
    console.log('Zoom range:', tilejson.minzoom, '-', tilejson.maxzoom);
  }
});

// Using TileJSON object directly
const tileJsonSpec: TileJson = {
  tilejson: '2.2.0',
  tiles: ['https://tiles.example.com/{z}/{x}/{y}.mvt'],
  vector_layers: [
    {
      id: 'buildings',
      fields: { height: 'Number', type: 'String' },
      minzoom: 10,
      maxzoom: 14
    }
  ],
  minzoom: 0,
  maxzoom: 14
};

const layer = new MVTLayer({
  id: 'direct-tilejson',
  data: tileJsonSpec,
  getFillColor: [140, 170, 180]
});

interface HighlightingProps {
  /** Property name to use as unique identifier across tiles */
  uniqueIdProperty?: string;
  
  /** Feature ID to highlight */
  highlightedFeatureId?: string | number | null;
}

// Enable cross-tile highlighting
const layer = new MVTLayer({
  id: 'highlighted-layer',
  data: 'https://tiles.example.com/{z}/{x}/{y}.mvt',
  uniqueIdProperty: 'osm_id', // Property that uniquely identifies features
  highlightedFeatureId: null, // Initially no highlight
  
  getFillColor: f => {
    // Highlight logic
    const isHighlighted = f.properties.osm_id === layer.props.highlightedFeatureId;
    return isHighlighted ? [255, 255, 0] : [140, 170, 180];
  },
  
  getLineColor: f => {
    const isHighlighted = f.properties.osm_id === layer.props.highlightedFeatureId;
    return isHighlighted ? [255, 0, 0] : [255, 255, 255];
  },
  
  pickable: true,
  onHover: info => {
    // Update highlight on hover
    if (info.object) {
      layer.setProps({
        highlightedFeatureId: info.object.properties.osm_id
      });
    } else {
      layer.setProps({
        highlightedFeatureId: null
      });
    }
  }
});

interface BinaryFeatureCollection {
  shape: 'binary-feature-collection';
  points?: BinaryPointFeatures;
  lines?: BinaryLineFeatures;  
  polygons?: BinaryPolygonFeatures;
}

interface BinaryPointFeatures {
  positions: Float64Array;
  properties: any[];
  numericProps?: {[key: string]: Float32Array};
}

interface BinaryLineFeatures {
  pathIndices: Uint16Array;
  positions: Float64Array;
  properties: any[];
  numericProps?: {[key: string]: Float32Array};
}

interface BinaryPolygonFeatures {
  polygonIndices: Uint16Array;
  positions: Float64Array;
  properties: any[];
  numericProps?: {[key: string]: Float32Array};
}

// Enable binary processing for better performance
const binaryLayer = new MVTLayer({
  id: 'binary-layer',
  data: 'https://tiles.example.com/{z}/{x}/{y}.mvt',
  binary: true,
  
  // Access binary data structures directly
  getFillColor: (f, {index, data}) => {
    if (data.binary) {
      // Access numeric properties from binary format
      const category = data.polygons?.numericProps?.category?.[index] || 0;
      return category === 1 ? [255, 0, 0] : [0, 255, 0];
    }
    return [140, 170, 180];
  },
  
  // Use binary data for performance-critical operations
  getElevation: (f, {index, data}) => {
    if (data.binary && data.polygons?.numericProps?.height) {
      return data.polygons.numericProps.height[index] * 10;
    }
    return 0;
  }
});