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using System;
using System.Runtime.InteropServices;
using Microsoft.Xna.Framework;
namespace MonoGame.Extended.Particles
{
/// <summary>
/// Defines a part of a line that is bounded by two distinct end points.
/// </summary>
[StructLayout(LayoutKind.Sequential)]
public struct LineSegment : IEquatable<LineSegment>
{
internal readonly Vector2 _point1;
internal readonly Vector2 _point2;
/// <summary>
/// Initializes a new instance of the <see cref="LineSegment" /> structure.
/// </summary>
/// <param name="point1"></param>
/// <param name="point2"></param>
public LineSegment(Vector2 point1, Vector2 point2)
{
_point1 = point1;
_point2 = point2;
}
public static LineSegment FromPoints(Vector2 p1, Vector2 p2) => new LineSegment(p1, p2);
public static LineSegment FromOrigin(Vector2 origin, Vector2 vector) => new LineSegment(origin, origin + vector);
public Vector2 Origin => _point1;
public Vector2 Direction
{
get
{
var coord = _point2 - _point1;
return new Vector2(coord.X, coord.Y);
}
}
public LineSegment Translate(Vector2 t)
{
return new LineSegment(_point1 + t, _point2 + t);
}
public Vector2 ToVector()
{
var t = _point2 - _point1;
return new Vector2(t.X, t.Y);
}
public bool Equals(LineSegment other)
{
// ReSharper disable ImpureMethodCallOnReadonlyValueField
return _point1.Equals(other._point1) && _point2.Equals(other._point2);
// ReSharper restore ImpureMethodCallOnReadonlyValueField
}
public override bool Equals(object obj)
{
if (ReferenceEquals(null, obj))
return false;
return obj is LineSegment & Equals((LineSegment) obj);
}
public override int GetHashCode()
{
return (_point1.GetHashCode()*397) ^ _point2.GetHashCode();
}
public override string ToString()
{
return $"({_point1.X}:{_point1.Y} {_point2.X}:{_point2.Y})";
}
}
}
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