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Distance.cs
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Distance.cs
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using System;
using System.Diagnostics;
namespace Xamarin.Forms.Maps
{
public struct Distance
{
const double MetersPerMile = 1609.344;
const double MetersPerKilometer = 1000.0;
public Distance(double meters)
{
Meters = meters;
}
public double Meters { get; }
public double Miles => Meters / MetersPerMile;
public double Kilometers => Meters / MetersPerKilometer;
public static Distance FromMiles(double miles)
{
if (miles < 0)
{
Debug.WriteLine("Negative values for distance not supported");
miles = 0;
}
return new Distance(miles * MetersPerMile);
}
public static Distance FromMeters(double meters)
{
if (meters < 0)
{
Debug.WriteLine("Negative values for distance not supported");
meters = 0;
}
return new Distance(meters);
}
public static Distance FromKilometers(double kilometers)
{
if (kilometers < 0)
{
Debug.WriteLine("Negative values for distance not supported");
kilometers = 0;
}
return new Distance(kilometers * MetersPerKilometer);
}
public static Distance BetweenPositions(Position position1, Position position2)
{
var latitude1 = position1.Latitude.ToRadians();
var longitude1 = position1.Longitude.ToRadians();
var latitude2 = position2.Latitude.ToRadians();
var longitude2 = position2.Longitude.ToRadians();
var distance = Math.Sin((latitude2 - latitude1) / 2.0);
distance *= distance;
var intermediate = Math.Sin((longitude2 - longitude1) / 2.0);
intermediate *= intermediate;
distance = distance + Math.Cos(latitude1) * Math.Cos(latitude2) * intermediate;
distance = 2 * GeographyUtils.EarthRadiusKm * Math.Atan2(Math.Sqrt(distance), Math.Sqrt(1 - distance));
return FromKilometers(distance);
}
public bool Equals(Distance other)
{
return Meters.Equals(other.Meters);
}
public override bool Equals(object obj)
{
if (ReferenceEquals(null, obj))
return false;
return obj is Distance && Equals((Distance)obj);
}
public override int GetHashCode()
{
return Meters.GetHashCode();
}
public static bool operator ==(Distance left, Distance right)
{
return left.Equals(right);
}
public static bool operator !=(Distance left, Distance right)
{
return !left.Equals(right);
}
}
}