Listener/functions.go

package main

import (
	"math"

	"github.com/umahmood/haversine"
)

func rad2deg(rad float64) float64 {
	return rad * (180 / math.Pi)
}

func calcDistance(lat_from float64, lon_from float64, lat_to float64, lon_to float64) float64 {
	from := haversine.Coord{Lat: lat_from, Lon: lon_from}
	to := haversine.Coord{Lat: lat_to, Lon: lon_to}
	_, km := haversine.Distance(from, to)
	return km
}

func calcMps(km float64, seconds float64) float64 {
	return (km * 1000) / seconds
}

func calcKnots(mps float64) float64 {
	return mps * 1.94384449
}

func calcKph(mps float64) float64 {
	return mps * 3.6
}

func calcMph(mps float64) float64 {
	return mps * 2.23694
}