306 lines
10 KiB
TypeScript
306 lines
10 KiB
TypeScript
// Trail management module for APRS position history visualization
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import type { LayerGroup, Polyline, CircleMarker, PolylineOptions } from 'leaflet';
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// Declare Leaflet as a global
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declare const L: typeof import('leaflet');
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export interface PositionHistory {
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lat: number;
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lng: number;
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timestamp: number;
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}
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export interface TrailState {
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positions: PositionHistory[];
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trail?: Polyline;
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dots?: CircleMarker[];
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color?: string;
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}
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export class TrailManager {
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private trailLayer: LayerGroup;
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private trails: Map<string, TrailState>;
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private showTrails: boolean;
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private trailDuration: number; // in milliseconds
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private maxTrails: number = 500; // Maximum number of trails to keep in memory
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private maxPositionsPerTrail: number = 1000; // Maximum positions per trail
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private colorPalette: string[] = [
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'#1E90FF', // Dodger Blue
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'#00CED1', // Dark Turquoise
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'#32CD32', // Lime Green
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'#8B008B', // Dark Magenta
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'#9370DB', // Medium Purple
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'#FF8C00', // Dark Orange
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'#4682B4', // Steel Blue
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'#00FA9A', // Medium Spring Green
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'#DA70D6', // Orchid
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'#008B8B', // Dark Cyan
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'#48D1CC', // Medium Turquoise
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'#228B22', // Forest Green
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'#6495ED', // Cornflower Blue
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'#FF1493', // Deep Pink (distinct from highways)
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'#20B2AA', // Light Sea Green
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];
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private proximityThreshold: number = 0.05; // ~5.5km at equator
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constructor(trailLayer: LayerGroup, trailDuration: number = 60 * 60 * 1000) {
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this.trailLayer = trailLayer;
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this.trails = new Map();
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this.showTrails = true;
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this.trailDuration = trailDuration;
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// Ensure trail layer is added to the map and visible
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if (this.trailLayer && this.trailLayer.bringToFront) {
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setTimeout(() => this.trailLayer.bringToFront(), 100);
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}
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}
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setShowTrails(show: boolean) {
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this.showTrails = show;
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if (!show) {
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// When hiding trails, just remove them from the layer but keep the data
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this.trails.forEach((trailState) => {
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if (trailState.trail) {
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this.trailLayer.removeLayer(trailState.trail);
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trailState.trail = undefined;
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}
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if (trailState.dots) {
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trailState.dots.forEach((dot) => this.trailLayer.removeLayer(dot));
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trailState.dots = [];
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}
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});
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} else {
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// When re-enabling trails, recreate all trails immediately, preserving colors
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this.trails.forEach((trailState, baseCallsign) => {
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this.updateTrailVisualization(baseCallsign, trailState, true);
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});
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}
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}
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addPosition(
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markerId: string,
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lat: number,
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lng: number,
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timestamp: number,
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isHistoricalDot: boolean = false,
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) {
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if (!this.showTrails) return;
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// Extract base callsign from markerId to group positions by callsign
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const baseCallsign = this.extractBaseCallsign(markerId);
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let trailState = this.trails.get(baseCallsign);
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if (!trailState) {
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// Check if we've reached the maximum number of trails
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if (this.trails.size >= this.maxTrails) {
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// Remove the oldest trail (first in the Map)
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const oldestKey = this.trails.keys().next().value;
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if (oldestKey) {
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this.removeTrail(oldestKey);
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}
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}
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trailState = { positions: [] };
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this.trails.set(baseCallsign, trailState);
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}
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// Check if this position already exists (avoid duplicates)
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const existingPos = trailState.positions.find(
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(pos) =>
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Math.abs(pos.lat - lat) < 0.00001 &&
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Math.abs(pos.lng - lng) < 0.00001 &&
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Math.abs(pos.timestamp - timestamp) < 1000, // Within 1 second
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);
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if (!existingPos) {
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// Add new position
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trailState.positions.push({ lat, lng, timestamp });
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// Sort positions by timestamp to maintain chronological order
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trailState.positions.sort((a, b) => a.timestamp - b.timestamp);
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// Limit the number of positions per trail
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if (trailState.positions.length > this.maxPositionsPerTrail) {
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// Keep the most recent positions
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trailState.positions = trailState.positions.slice(-this.maxPositionsPerTrail);
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}
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}
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// For historical dots, keep all positions. For live positions, filter by time.
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if (!isHistoricalDot) {
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const cutoffTime = Date.now() - this.trailDuration;
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trailState.positions = trailState.positions.filter((pos) => {
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// Ensure timestamp is a number for comparison
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const posTimestamp =
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typeof pos.timestamp === "string" ? new Date(pos.timestamp).getTime() : pos.timestamp;
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return posTimestamp >= cutoffTime;
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});
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}
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// Always update trail visualization, with immediate=true for historical dots
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// This ensures historical trails are immediately visible when loaded all at once
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this.updateTrailVisualization(baseCallsign, trailState, isHistoricalDot);
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}
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private extractBaseCallsign(markerId: string | number): string {
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// Ensure markerId is a string
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const id = String(markerId);
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// For historical markers like "hist_CALLSIGN_123", extract the CALLSIGN part
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if (id.startsWith("hist_")) {
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// Remove hist_ prefix and any trailing numeric index
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const withoutPrefix = id.replace(/^hist_/, "");
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// Remove trailing _digits pattern
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return withoutPrefix.replace(/_\d+$/, "");
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}
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// For regular callsigns or IDs, return as-is
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return id;
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}
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// Calculate distance between two points using Haversine formula
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private calculateDistance(lat1: number, lng1: number, lat2: number, lng2: number): number {
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const R = 6371; // Earth's radius in km
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const dLat = (lat2 - lat1) * Math.PI / 180;
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const dLng = (lng2 - lng1) * Math.PI / 180;
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const a = Math.sin(dLat/2) * Math.sin(dLat/2) +
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Math.cos(lat1 * Math.PI / 180) * Math.cos(lat2 * Math.PI / 180) *
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Math.sin(dLng/2) * Math.sin(dLng/2);
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const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
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return R * c;
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}
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// Get the average position of a trail
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private getTrailCenter(positions: PositionHistory[]): { lat: number, lng: number } {
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if (positions.length === 0) return { lat: 0, lng: 0 };
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const sum = positions.reduce((acc, pos) => ({
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lat: acc.lat + pos.lat,
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lng: acc.lng + pos.lng
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}), { lat: 0, lng: 0 });
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return {
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lat: sum.lat / positions.length,
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lng: sum.lng / positions.length
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};
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}
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// Find nearby trails and get their colors
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private getNearbyTrailColors(baseCallsign: string, center: { lat: number, lng: number }): Set<string> {
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const nearbyColors = new Set<string>();
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this.trails.forEach((trailState, callsign) => {
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if (callsign === baseCallsign || !trailState.color || trailState.positions.length === 0) return;
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const otherCenter = this.getTrailCenter(trailState.positions);
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const distance = this.calculateDistance(center.lat, center.lng, otherCenter.lat, otherCenter.lng);
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if (distance < this.proximityThreshold * 111) { // Convert degrees to km (rough approximation)
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nearbyColors.add(trailState.color);
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}
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});
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return nearbyColors;
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}
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// Assign a color to a trail based on nearby trails
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private assignTrailColor(baseCallsign: string, positions: PositionHistory[]): string {
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if (positions.length === 0) return this.colorPalette[0];
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const center = this.getTrailCenter(positions);
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const nearbyColors = this.getNearbyTrailColors(baseCallsign, center);
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// Find the first available color not used by nearby trails
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for (const color of this.colorPalette) {
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if (!nearbyColors.has(color)) {
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return color;
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}
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}
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// If all colors are used, return the first color
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return this.colorPalette[0];
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}
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private updateTrailVisualization(
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baseCallsign: string,
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trailState: TrailState,
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immediate: boolean = false,
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) {
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// Remove old trail and dots
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if (trailState.trail) {
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this.trailLayer.removeLayer(trailState.trail);
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}
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if (trailState.dots) {
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trailState.dots.forEach((dot) => this.trailLayer.removeLayer(dot));
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trailState.dots = [];
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}
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// Create new trail if we have at least 2 positions
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if (trailState.positions.length >= 2) {
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const latLngs: [number, number][] = trailState.positions.map((pos) => [pos.lat, pos.lng]);
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// Assign color if not already assigned
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if (!trailState.color) {
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trailState.color = this.assignTrailColor(baseCallsign, trailState.positions);
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}
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// Create polyline with assigned color
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// For historical positions (immediate=true), use higher opacity for better visibility
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const polylineOptions: PolylineOptions = {
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color: trailState.color,
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weight: 3,
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opacity: immediate ? 0.9 : 0.8,
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smoothFactor: 1,
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lineCap: "round",
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lineJoin: "round",
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className: "historical-trail-line",
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};
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trailState.trail = L.polyline(latLngs, polylineOptions).addTo(this.trailLayer);
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// Don't create additional dots here since historical positions are now shown as markers
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trailState.dots = [];
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}
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}
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removeTrail(markerId: string) {
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const baseCallsign = this.extractBaseCallsign(markerId);
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const trailState = this.trails.get(baseCallsign);
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if (trailState) {
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if (trailState.trail) {
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this.trailLayer.removeLayer(trailState.trail);
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}
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if (trailState.dots) {
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trailState.dots.forEach((dot) => this.trailLayer.removeLayer(dot));
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}
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this.trails.delete(baseCallsign);
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}
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}
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clearAllTrails() {
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this.trails.forEach((_, markerId) => {
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this.removeTrail(markerId);
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});
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}
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cleanupOldPositions() {
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// Don't clean up historical positions - only clean up very old live positions
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const veryOldCutoff = Date.now() - 24 * 60 * 60 * 1000; // 24 hours
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this.trails.forEach((trailState, markerId) => {
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const originalLength = trailState.positions.length;
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trailState.positions = trailState.positions.filter((pos) => {
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// Ensure timestamp is a number for comparison
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const posTimestamp =
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typeof pos.timestamp === "string" ? new Date(pos.timestamp).getTime() : pos.timestamp;
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// Keep all positions newer than 24 hours (includes all historical data we care about)
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return posTimestamp >= veryOldCutoff;
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});
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if (trailState.positions.length === 0) {
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this.removeTrail(markerId);
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} else if (trailState.positions.length !== originalLength) {
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this.updateTrailVisualization(markerId, trailState);
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}
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});
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}
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}
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