calculate yandex direction based on lat/lng

yandexDirectionMapper.go

type Point struct {
	Lat float64
	Lng float64
}

func YandexDirectionMapper(old Point, new Point) (float64, float64) {
	length := math.Sqrt(math.Pow(new.Lng-old.Lng, 2) + math.Pow(new.Lat-old.Lat, 2))

	if length == 0 {
		return 0, 0
	}

	unitX := (new.Lng - old.Lng) / length
	unitX5 := float64(int64((unitX)*100000)) / 100000

	unitY := (new.Lat - old.Lat) / length
	unitY5 := float64(int64(unitY*100000)) / 100000

	return unitX5, unitY5
}