mobiniqow
2823fb45f5
Phone+OTP auth, staged onboarding, admin approval workflow, and a full discovery/swipe/match/chat system with photo upload and approximate distance (haversine) based on user location. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
20 lines
584 B
Go
20 lines
584 B
Go
package utils
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import "math"
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const earthRadiusKM = 6371.0
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// HaversineKM فاصلهی تقریبی بین دو مختصات جغرافیایی رو به کیلومتر برمیگردونه.
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func HaversineKM(lat1, lng1, lat2, lng2 float64) float64 {
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toRad := func(deg float64) float64 { return deg * math.Pi / 180 }
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dLat := toRad(lat2 - lat1)
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dLng := toRad(lng2 - lng1)
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a := math.Sin(dLat/2)*math.Sin(dLat/2) +
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math.Cos(toRad(lat1))*math.Cos(toRad(lat2))*math.Sin(dLng/2)*math.Sin(dLng/2)
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c := 2 * math.Atan2(math.Sqrt(a), math.Sqrt(1-a))
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return earthRadiusKM * c
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}
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