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Point.cs
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// Copyright © Joerg Battermann 2014, Matt Hunt 2017
using System;
using GeoJSON.Text.Converters;
using System.Collections.Generic;
using System.Text.Json.Serialization;
namespace GeoJSON.Text.Geometry
{
/// <summary>
/// Defines the Point type.
/// In geography, a point refers to a Position on a map, expressed in latitude and longitude.
/// </summary>
/// <remarks>
/// See https://tools.ietf.org/html/rfc7946#section-3.1.2
/// </remarks>
public class Point : GeoJSONObject, IGeometryObject, IEqualityComparer<Point>, IEquatable<Point>
{
public Point()
{
}
/// <summary>
/// Initializes a new instance of the <see cref="Point" /> class.
/// </summary>
/// <param name="coordinates">The Position.</param>
public Point(IPosition coordinates)
{
Coordinates = coordinates ?? throw new ArgumentNullException(nameof(coordinates));
}
[JsonPropertyName("type")]
[JsonIgnore(Condition = JsonIgnoreCondition.Never)]
public override GeoJSONObjectType Type => GeoJSONObjectType.Point;
/// <summary>
/// The <see cref="IPosition" /> underlying this point.
/// </summary>
[JsonPropertyName("coordinates")]
[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
[JsonConverter(typeof(PositionConverter))]
public IPosition Coordinates { get; set; }
#region IEqualityComparer, IEquatable
/// <summary>
/// Determines whether the specified object is equal to the current object
/// </summary>
public override bool Equals(object obj)
{
return Equals(this, obj as Point);
}
/// <summary>
/// Determines whether the specified object is equal to the current object
/// </summary>
public bool Equals(Point other)
{
return Equals(this, other);
}
/// <summary>
/// Determines whether the specified object instances are considered equal
/// </summary>
public bool Equals(Point left, Point right)
{
if (base.Equals(left, right))
{
return left.Coordinates.Equals(right.Coordinates);
}
return false;
}
/// <summary>
/// Determines whether the specified object instances are considered equal
/// </summary>
public static bool operator ==(Point left, Point right)
{
if (ReferenceEquals(left, right))
{
return true;
}
if (ReferenceEquals(null, right))
{
return false;
}
return left != null && left.Equals(right);
}
/// <summary>
/// Determines whether the specified object instances are not considered equal
/// </summary>
public static bool operator !=(Point left, Point right)
{
return !(left == right);
}
/// <summary>
/// Returns the hash code for this instance
/// </summary>
public override int GetHashCode()
{
int hash = base.GetHashCode();
hash = (hash * 397) ^ Coordinates.GetHashCode();
return hash;
}
/// <summary>
/// Returns the hash code for the specified object
/// </summary>
public int GetHashCode(Point other)
{
return other.GetHashCode();
}
#endregion
}
}