Paul Bailey
e18997ed95
- Created LocationSelector component with three location input methods: * Auto-populate from photo EXIF data * Device GPS location capture with accuracy indicator * Interactive Leaflet map picker with draggable marker - Added Ireland coordinate validation (lat: 51.4-55.4, lng: -10.5--5.5) - Created coordinate utility functions for validation and formatting - Added LocationSelectorDemo page for testing at /demo/location-selector - Displays selected location with coordinates, source, and accuracy - Provides clear error messages for validation failures - Satisfies requirements 1.1, 1.2, 1.3, 8.2
62 lines
1.6 KiB
TypeScript
62 lines
1.6 KiB
TypeScript
// Utility functions for the Beach Litter Mapping Platform
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// Re-export coordinate utilities
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export * from './coordinates';
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/**
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* Formats a date to ISO 8601 format
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*/
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export function formatDateISO(date: Date): string {
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return date.toISOString();
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}
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/**
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* Calculates distance between two coordinates in meters using Haversine formula
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*/
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export function calculateDistance(
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lat1: number,
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lng1: number,
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lat2: number,
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lng2: number
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): number {
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const R = 6371e3; // Earth's radius in meters
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const φ1 = (lat1 * Math.PI) / 180;
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const φ2 = (lat2 * Math.PI) / 180;
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const Δφ = ((lat2 - lat1) * Math.PI) / 180;
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const Δλ = ((lng2 - lng1) * Math.PI) / 180;
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const a =
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Math.sin(Δφ / 2) * Math.sin(Δφ / 2) +
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Math.cos(φ1) * Math.cos(φ2) * Math.sin(Δλ / 2) * Math.sin(Δλ / 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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/**
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* Validates file type for photo uploads
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*/
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export function isValidImageFile(file: File): boolean {
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const validTypes = ['image/jpeg', 'image/jpg', 'image/png', 'image/webp'];
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return validTypes.includes(file.type);
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}
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/**
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* Validates file size (max 5MB)
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*/
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export function isValidFileSize(file: File, maxSizeMB: number = 5): boolean {
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const maxSizeBytes = maxSizeMB * 1024 * 1024;
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return file.size <= maxSizeBytes;
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}
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/**
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* Formats bytes to human-readable size
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*/
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export function formatFileSize(bytes: number): string {
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if (bytes === 0) return '0 Bytes';
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const k = 1024;
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const sizes = ['Bytes', 'KB', 'MB', 'GB'];
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const i = Math.floor(Math.log(bytes) / Math.log(k));
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return Math.round(bytes / Math.pow(k, i) * 100) / 100 + ' ' + sizes[i];
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}
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