MoonTools.Bonk/Bonk/Shapes/Line.cs

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using System;
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using System.Collections.Generic;
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using System.Numerics;
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using MoonTools.Core.Structs;
namespace MoonTools.Core.Bonk
{
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/// <summary>
/// A line is a shape defined by exactly two points in space.
/// </summary>
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public struct Line : IShape2D, IEquatable<IShape2D>
{
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private Position2D v0;
private Position2D v1;
private IEnumerable<Position2D> vertices
{
get
{
yield return v0;
yield return v0;
}
}
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public Line(Position2D start, Position2D end)
{
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v0 = start;
v1 = end;
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}
public Vector2 Support(Vector2 direction, Transform2D transform)
{
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var TransformedStart = Vector2.Transform(v0, transform.TransformMatrix);
var TransformedEnd = Vector2.Transform(v1, transform.TransformMatrix);
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return Vector2.Dot(TransformedStart, direction) > Vector2.Dot(TransformedEnd, direction) ?
TransformedStart :
TransformedEnd;
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}
public AABB AABB(Transform2D Transform2D)
{
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return Bonk.AABB.FromTransformedVertices(vertices, Transform2D);
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}
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public override bool Equals(object obj)
{
if (obj is IShape2D other)
{
return Equals(other);
}
return false;
}
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public bool Equals(IShape2D other)
{
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if (other is Line otherLine)
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{
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return (v0 == otherLine.v0 && v1 == otherLine.v1) || (v1 == otherLine.v0 && v0 == otherLine.v1);
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}
return false;
}
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public override int GetHashCode()
{
var hashCode = -851829407;
hashCode = hashCode * -1521134295 + EqualityComparer<Position2D>.Default.GetHashCode(v0);
hashCode = hashCode * -1521134295 + EqualityComparer<Position2D>.Default.GetHashCode(v1);
hashCode = hashCode * -1521134295 + EqualityComparer<IEnumerable<Position2D>>.Default.GetHashCode(vertices);
return hashCode;
}
public static bool operator ==(Line a, Line b)
{
return a.Equals(b);
}
public static bool operator !=(Line a, Line b)
{
return !(a == b);
}
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}
}